December 2009 - Boost-users - lists.preview.boost.org

Statechart serialization
by mbrodeur65 04 Mar '15

04 Mar '15

Hi, I'm looking for a solution to serialize boost::statechart objects. I'm aware that this feature is on the statechart library todo list but was wondering if there are any workaround to achieve this with the latest boost release (1.34) ? thanks for your help ! mbrodeur65 -- View this message in context: http://www.nabble.com/Statechart-serialization-tf4131326.html#a11749139 Sent from the Boost - Users mailing list archive at Nabble.com.

4 4

[Statechart] How to decide between post_event and process_event atrun time ?
by Philippe DAVID 22 Jul '14

22 Jul '14

Hi, I have a method in which I want to post/process an event. The thing is, this method can be called from outside the state machine (so I need to call process_event), or indirectly by a reaction of the state machine (in this case I must call post_event since process_event is not reentrant). I don't want to write 2 distinct methods to do this (one that calls post, and the other process), I would much rather prefer adding a 'if' in my method that tells me if I have to call process_event or post_event (if I'm being called indirectly by the state machine or not). Is there a way to do this with statechart ? regards, Philippe

3 3

[asio] resolver::cancel() problem
by Matthew Edwards 14 Mar '14

14 Mar '14

In my application (and a separate test program) it seems as though the cancel() function on the resolver does not work as intended. For async resolves, the cancel functionality should abort them immediately and pass an 'operation aborted' error code to the callback handler. In my tests, I will resolve an invalid domain (this causes the resolve to take a few seconds, to demonstrate the problem), sleep for 100ms, then call cancel on the resolver object. No cancelling actually occurs, and the callback is simply triggered after a few seconds with a "No host found" error code, not the expected operation aborted. Has anyone experienced this before, or know how I might be using the resolver incorrectly?

3 2

[BGL] Having a cost function as weight map
by Maxime van Noppen 06 Sep '13

06 Sep '13

Hi, I can't find how to do this pretty basic thing : having a function instead of a field to compute the cost of edges for various path finding algorithms. I couldn't find the answer in the documentation and Google was of no help. Did I miss something obvious ? Example : ------------------- #include <boost/graph/dijkstra_shortest_paths.hpp> #include <boost/graph/graph_traits.hpp> #include <boost/graph/adjacency_list.hpp> struct my_edge { double cost() const { return cost_ * 2; } double cost_; }; struct my_node { }; int main() { typedef boost::adjacency_list< boost::vecS, boost::vecS, boost::directedS, my_node, my_edge > graph_t; typedef boost::graph_traits<graph_t>::vertex_descriptor vertex_t; graph_t graph; vertex_t v /*= ... */; using boost::weight_map; // Works : boost::dijkstra_shortest_paths(graph, v, weight_map(boost::get(&my_edge::cost_, graph))); // Doesn't compile : //boost::dijkstra_shortest_paths(graph, v, // weight_map(boost::get(&my_edge::cost, graph))); } ------------------- Thanks ! -- Maxime

4 8

can't get first example in boost tutorial to work
by 7stud 11 Mar '13

11 Mar '13

I'm trying to install boost on mac osx 10.4.7. I followed the tutorial "Getting Started on Unix Variants" found here: http://www.boost.org/doc/libs/1_35_0/ more/getting_started/unix-variants.html Following the instructions in the tutorial, I installed boost in /usr/local as instructed, so my directory structure is: /usr/local/boost_1_34_1/boost But when I run the first example in the tutorial: #include <boost/lambda/lambda.hpp> #include <iostream> #include <iterator> #include <algorithm> int main() { using namespace boost::lambda; typedef std::istream_iterator<int> in; std::for_each(in(std::cin), in(), std::cout << (_1 * 3) << " " ); } I get the error(among others): error: boost/lambda/lambda.hpp: No such file or directory If I change the include path to: #include </user/local/boost_1_34_1/boost/lambda/lambda.hpp> I get the error(among others): error: boost/lambda/core.hpp: No such file or directory But core.hpp is in the lambda directory: /usr/local/boost_1_34_1/boost/lambda$ ls algorithm.hpp control_structures.hpp lambda.hpp bind.hpp core.hpp loops.hpp casts.hpp detail numeric.hpp closures.hpp exceptions.hpp switch.hpp construct.hpp if.hpp I'm using the Xcode 2.4 IDE to run my C++ programs. I also tried to execute the program from the command line with the original include path: #include <boost/lambda/lambda.hpp> but I get the same error: ~/2testing/dir1$ g++ prog1.cpp prog1.cpp:1:35: error: boost/lambda/lambda.hpp: No such file or directory prog1.cpp: In function 'int main()': prog1.cpp:8: error: 'boost' has not been declared prog1.cpp:8: error: expected namespace-name before ';' token prog1.cpp:8: error: '<type error>' is not a namespace prog1.cpp:11: error: '_1' was not declared in this scope I get the same errors again with the full include path: #include </user/local/boost_1_34_1/boost/lambda/lambda.hpp> $ g++ prog1.cpp In file included from prog1.cpp:1: /usr/local/boost_1_34_1/boost/lambda/lambda.hpp:14:33: error: boost/lambda/core.hpp: No such file or directory /usr/local/boost_1_34_1/boost/lambda/lambda.hpp:21:52: error: boost/lambda/detail/operator_actions.hpp: No such file or directory /usr/local/boost_1_34_1/boost/lambda/lambda.hpp:22:61: error: boost/lambda/detail/operator_lambda_func_base.hpp: No such file or directory /usr/local/boost_1_34_1/boost/lambda/lambda.hpp:23:63: error: boost/lambda/detail/operator_return_type_traits.hpp: No such file or directory /usr/local/boost_1_34_1/boost/lambda/lambda.hpp:26:45: error: boost/lambda/detail/operators.hpp: No such file or directory /usr/local/boost_1_34_1/boost/lambda/lambda.hpp:30:46: error: boost/lambda/detail/member_ptr.hpp: No such file or directory prog1.cpp: In function 'int main()': prog1.cpp:8: error: 'boost' has not been declared prog1.cpp:8: error: expected namespace-name before ';' token prog1.cpp:8: error: '<type error>' is not a namespace prog1.cpp:11: error: '_1' was not declared in this scope What path should I be using? Or, should I set an environment variable somewhere?

6 16

[multi_array] operator= requires resize - why?
by Markus Werle 04 Jun '12

04 Jun '12

Hi! IMHO the behaviour of operator= for multi_array is a little bit broken. A lot of preconditions required: template <typename ConstMultiArray> multi_array_ref& operator=(const ConstMultiArray& other) { [...] // make sure the dimensions agree assert(other.num_dimensions() == this->num_dimensions()); assert(std::equal(other.shape(),other.shape()+this->num_dimensions(), this->shape())); Besides the fact that I get mad about asserts instead of exceptions (please change this to a way users may choose) why do we have such an odd behaviour here? >From page 1, line 3 of the docs I cite: "The interface design is in line with the precedent set by the C++ Standard Library containers" - this is not true for operator=, since std::<container>::operator= works fine for me all the time _without_ any resize. Could we please change the behaviour of multi_array::operator= to take care of resize where in need to? IMHO operator= should result in a true copy ignoring previous state. Markus

6 18

MSVC Visualizers Update
by Filip Konvička 28 Jul '11

28 Jul '11

Hi all, I've just updated the Boost visualizers wiki page at https://svn.boost.org/trac/boost/wiki/DebuggerVisualizers I updated the visualizer for Boost.MultiIndex, which did not work since Boost 1.35. I also added new visualizers for Boost.DateTime (ptime and time_duration) and a simple boost::shared_ptr visualizer. The visualizers are available for checkout via SVN at https://svn.boost.org/svn/boost/sandbox/boost_docs/subprojects/DebuggerVisu… Cheers, Filip

6 7

Asio unhandled exception
by Łukasz Majewski 20 May '11

20 May '11

Hello, I created a server single thread async (linux) and clinet (win). Every time client is close while server is writing to the socket connected to this client exception appears: terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error>>' what(): Transport endpoint is not connected Aborted and server is terminated. I dont know why this exception is unhandled. int main( int argc, char** argv ) { try { boost::asio::io_service io_service; quotation_server server( io_service ); while ( true ) { try { io_service.run(); } catch( ... ){} } } catch ( std::exception& e ) { LOG << e.what() << std::endl; } catch( ... ) { LOG << "Unexpected exception" << std::endl; } return 0; }

2 1

Simple serial port demonstration with boost asio asynchronous I/O
by Jeff Gray 26 Jan '11

26 Jan '11

A couple of weeks ago I posted a simple asynchronous demonstration of a telnet client using boost asio TCP network code. I have changed this code to turn it into a simple serial terminal application using the serial port support in the new version of boost asio. It required no changes at all the the read or write code. I just altered the initialization to use a serial port instead of a socket. Note that this is not intended to show how a fully functional application would work. There are plenty of areas that are not handled in this code. But it shows the idea and it's easy to build on this once you've got it working. Hope this helps someone else get started... Jeff

3 2

[Program Options] Positional args in help message
by Lindley M French 10 Nov '10

10 Nov '10

The examples for how to use positional arguments are great and seem to work fine. However, I'm wondering if there's an automatic way to include that information in the help message. In particular, since the tutorial goes to the trouble of telling you how to exclude the positional options from the options help, it would be nice to know what to replace it with. I could manually write a line detailing the usage before outputting the options description, of course, but I was wondering if there was anything in PO to handle this automatically.

3 2

Help with shared_ptr and template
by Mario Chacon 10 Sep '10

10 Sep '10

Hello: I have this problem and I do not how to fix it, I know I cannot write template typedefs, its a limitiation of the C++ syntax, right? or I'm wrong? I saw that the best way is to wrap your typedefs in a struct, which can be templated, but I'm still stack with problems. The best way to explain it's with an example: #include <cstdlib> #include <iostream> #include <boost/shared_ptr.hpp> template< typename tvalue > class CValue { public: CValue( tvalue value ) : value_(value) {}; private: tvalue value_; }; template< typename tvalue > struct Type{ typedef boost::shared_ptr< CValue< tvalue > > pValue; }; int main(int argc, char *argv[]) { Type<bool>::pValue a; return EXIT_SUCCESS; } How can I create a shared_ptr for the template class "CVALUE"?? Please I do not know what else I can prove... :( Thank you.. Mario.. Salu2...

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Link issue with condition_variable
by Bradley W. Settlemyer 19 Mar '10

19 Mar '10

Hello, I'm using boost for the first time and I'm struggling to link my program. I've added libboost_pthread-mt to the link link (which got most of the symbols), but I still can't seem to get the symbols for the condition variables. The issue could be with the code, as I find the lock-mutex-condition_variable interactions to be very confusing, but it does appear to be a link issue. Consider the following error message emitted during link command: mpicxx <objects> -D_FILE_OFFSET_BITS=64 -L/lib64 -lfuse -lrt -ldl -lboost_thread-mt -lpthread -o aio_benchmark src/aio/thread_pool_adaptive_writer.o: In function `aio::ThreadPoolWriter::Write(aio::File*, std::vector<int, std::allocator<int> >, void*, unsigned long)': /home/bws/sandbox/aiofs/src/aio/thread_pool_writer.cc:59: undefined reference to `boost::condition_variable::notify_all()' /home/bws/sandbox/aiofs/src/aio/thread_pool_writer.cc:63: undefined reference to `boost::condition_variable::wait(boost::unique_lock<boost::mutex>&)' src/aio/thread_pool_writer.o: In function `aio::ThreadPoolWriter::threadWait()': /home/bws/sandbox/aiofs/src/aio/thread_pool_writer.cc:76: undefined reference to `boost::condition_variable::wait(boost::unique_lock<boost::mutex>&)' /home/bws/sandbox/aiofs/src/aio/thread_pool_writer.cc:110: undefined reference to `boost::condition_variable::notify_one()' Is condition variable in a different library? I am using the boost stuff distributed with Fedora 11: boost-1.37.0-7.fc11.x86_64 boost-devel-1.37.0-7.fc11.x86_64 Cheers, Brad

2 2

Syntax error when using BOOST_CHECK_PREDICATE
by Andrew J. Leer 24 Feb '10

24 Feb '10

Reading this article: http://www.ibm.com/developerworks/aix/library/au-ctools1_boost/?S_TACT=105A… I'm using Boost 1.40.0 and Visual Studio 2005 with Visual C++ 8.0. I've entered Listing 14 with a few additional lines of logging code: #include "stdafx.h" #define BOOST_TEST_MODULE example #include <boost/test/included/unit_test.hpp> std::list<int> user_defined_func( ) { std::cout << "BEGIN: user_defined_func" << std::endl; std::list<int> l; l.push_back(8); l.push_back(0); std::cout << "END: user_defined_func" << std::endl; return l; } bool validate_list(std::list<int> &L1) { std::cout << "BEGIN: validate_list" << std::endl; std::list<int>::iterator it1 = L1.begin(); for(; it1 != L1.end(); ++it1) { if(*it1<= 1){ std::cout << "Validation failed because an item in the list was less than or equal to 1." << std::endl; std::cout << "END: validate_list" << std::endl; return false; } } std::cout << "Test passed because all of the items in the list were greater than or equal to 1" << std::endl; std::cout << "END: validate_list" << std::endl; return true; } BOOST_AUTO_TEST_SUITE( test ) BOOST_AUTO_TEST_CASE( test ) { std::list<int>& list1 = user_defined_func(); BOOST_CHECK_PREDICATE( validate_list, list1 ); } BOOST_AUTO_TEST_SUITE_END() Now when I go to compile this, it ends up giving me an error: 1>------ Build started: Project: UnitTestTests, Configuration: Debug Win32 ------ 1>Compiling... 1>UnitTestTests.cpp 1>c:\program files (x86)\boost\boost_1_40\boost\test\impl\execution_monitor.ipp(904) : warning C4535: calling _set_se_translator() requires /EHa 1>c:\program files (x86)\boost\boost_1_40\boost\test\utils\runtime\config.hpp(90) : warning C4996: 'putenv': The POSIX name for this item is deprecated. Instead, use the ISO C++ conformant name: _putenv. See online help for details. 1> c:\program files (x86)\microsoft visual studio 8\vc\include\stdlib.h(900) : see declaration of 'putenv' 1>c:\program files (x86)\boost\boost_1_40\boost\test\utils\runtime\cla\char_parameter.ipp(36) : warning C4244: 'argument' : conversion from 'boost::rtti::id_t' to 'const int', possible loss of data 1>c:\program files (x86)\boost\boost_1_40\boost\test\utils\runtime\cla\named_parameter.ipp(41) : warning C4244: 'argument' : conversion from 'boost::rtti::id_t' to 'const int', possible loss of data 1>c:\program files (x86)\boost\boost_1_40\boost\test\utils\runtime\env\environment.ipp(82) : warning C4996: 'getenv': This function or variable may be unsafe. Consider using _dupenv_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. 1> c:\program files (x86)\microsoft visual studio 8\vc\include\stdlib.h(483) : see declaration of 'getenv' 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(45) : error C2146: syntax error : missing ')' before identifier 'BOOST_PP_IIF_BOOST_PP_BOOL_0' 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(45) : error C2780: 'bool boost::test_tools::tt_detail::check_frwd(Pred,const boost::unit_test::lazy_ostream &,boost::test_tools::const_string,size_t,boost::test_tools::tt_detail::tool_level,boost::test_tools::tt_detail::check_type,const Arg0 &,const char *,const Arg1 &,const char *,const Arg2 &,const char *,const Arg3 &,const char *,const Arg4 &,const char *)' : expects 16 arguments - 6 provided 1> c:\program files (x86)\boost\boost_1_40\boost\test\test_tools.hpp(523) : see declaration of 'boost::test_tools::tt_detail::check_frwd' 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(45) : error C2780: 'bool boost::test_tools::tt_detail::check_frwd(Pred,const boost::unit_test::lazy_ostream &,boost::test_tools::const_string,size_t,boost::test_tools::tt_detail::tool_level,boost::test_tools::tt_detail::check_type,const Arg0 &,const char *,const Arg1 &,const char *,const Arg2 &,const char *,const Arg3 &,const char *)' : expects 14 arguments - 6 provided 1> c:\program files (x86)\boost\boost_1_40\boost\test\test_tools.hpp(523) : see declaration of 'boost::test_tools::tt_detail::check_frwd' 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(45) : error C2780: 'bool boost::test_tools::tt_detail::check_frwd(Pred,const boost::unit_test::lazy_ostream &,boost::test_tools::const_string,size_t,boost::test_tools::tt_detail::tool_level,boost::test_tools::tt_detail::check_type,const Arg0 &,const char *,const Arg1 &,const char *,const Arg2 &,const char *)' : expects 12 arguments - 6 provided 1> c:\program files (x86)\boost\boost_1_40\boost\test\test_tools.hpp(523) : see declaration of 'boost::test_tools::tt_detail::check_frwd' 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(45) : error C2780: 'bool boost::test_tools::tt_detail::check_frwd(Pred,const boost::unit_test::lazy_ostream &,boost::test_tools::const_string,size_t,boost::test_tools::tt_detail::tool_level,boost::test_tools::tt_detail::check_type,const Arg0 &,const char *,const Arg1 &,const char *)' : expects 10 arguments - 6 provided 1> c:\program files (x86)\boost\boost_1_40\boost\test\test_tools.hpp(523) : see declaration of 'boost::test_tools::tt_detail::check_frwd' 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(45) : error C2780: 'bool boost::test_tools::tt_detail::check_frwd(Pred,const boost::unit_test::lazy_ostream &,boost::test_tools::const_string,size_t,boost::test_tools::tt_detail::tool_level,boost::test_tools::tt_detail::check_type,const Arg0 &,const char *)' : expects 8 arguments - 6 provided 1> c:\program files (x86)\boost\boost_1_40\boost\test\test_tools.hpp(523) : see declaration of 'boost::test_tools::tt_detail::check_frwd' 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(45) : error C2059: syntax error : ')' 1>Build log was saved at "file://c:\Users\andy\Documents\Visual Studio 2005\Projects\UnitTestTests\UnitTestTests\Debug\BuildLog.htm" It seems to have some real problems with the BOOST_CHECK_PREDICATE macro why is this? Thank you, Andrew J. Leer 1>UnitTestTests - 7 error(s), 5 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

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Transfering the process state to another process
by Lloyd 18 Feb '10

18 Feb '10

Hi, We want to have a program which cannot be terminated by the user (even admin). I think the only way to do this is to write a watchdog process. So there will be a master and a slave process, the master will be the active process, and the slave keep on watching the master. I case if the master is terminated, the slave become master and initiates a new slave process. But we need to transfer (or share) the process state of "old master" with the "new master" (So that the new master can continue form where the old master has stopped). Is this possible with shared memory? Or is there is a better way? Thanks, Lloyd ______________________________________ Scanned and protected by Email scanner

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[1.35.0][OSX][iostreams] Exception thrown with utf8 filename
by Christophe Radondy 17 Feb '10

17 Feb '10

Hi, I try to do a cross-platform source code and I have this code. I compiled boost 1.35 in universal binaries on Mac OS 10.5.4 with intel platform (IMAC core 2 duo 3Ghz) The same code works on linux (Ubuntu 8.0.4 and debian) and windows platforms but on Mac OS 10.5 I have an exception in boost's libraries. We compile on universal binaries with -fexceptions options of g++ 4.0.1 (Apple). This is my code: <code> boost::filesystem::wpath unicode(L"abcdef\u0110"); boost::filesystem::ofstream file(unicode.string()); // throws Invalid Argument on Mac file << "abcdef" << endl; file.close(); <endcode/> If I do this, it works: <code> boost::filesystem::path utf8("abcdef\xC4\x90"); // \xC4\x90 == \u0110 boost::filesystem::ofstream file(utf8.string()); // works ok file << "abcdef" << endl; file.close(); <endcode/> When the ofstream is created, this function is executed and crashes when I use Unicode parameters : <code> unicode.external_file_string(); // throws uncaught exception of type boost::filesystem::basic_filesystem_error<boost::filesystem::basic_path<std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >, boost::filesystem::wpath_traits> > - boost::filesystem::wpath::to_external conversion error: Invalid argument <endcode/> Do you have any idea? Is this a known bug? Did I miss a setting? Thanks for your help. Regards, Christophe.

2 2

[Boost] Is this library availble for 64 bit?
by Jaiswal, Usha [OS-IE] 11 Feb '10

11 Feb '10

Is there any version of Boost for 64 bit.

5 5

Boost Graph Lib > A*
by Damien Maupu 09 Feb '10

09 Feb '10

Dear all, First Hello. Then does anybody knows how the a star search works for implicit graph? There is little information on the Internet. I found a pdf: A* Graph Search Within the BGL Framework http://www.cs.rpi.edu/~beevek/research/astar_bgl04.pdf But I wasn't able to run the implicit graph example because I am missing: #include <nonconst_bfs.hpp> and #include "test-astar-visitors.hpp" #include "test-astar-accept.hpp" In the online doc: http://www.boost.org/doc/libs/1_40_0/libs/graph/doc/astar_search.html It is said to use astar_search_no_init but I don't know how. Any clues? Thank you Sincerely, Damien

2 4

Serialization of a unordered_map
by Basti Korf 08 Feb '10

08 Feb '10

Hallo, I just wondered, why there is no possibility to serialize a unordered map. Since the STL map is serialized, i take the file for it and changed all maps to boost::unordered_map (multimap). Or is there a better way, i just did not see? Here is the code: #ifndef BOOST_SERIALIZATION_UNORDEREDMAP_HPP #define BOOST_SERIALIZATION_UNORDEREDMAP_HPP // MS compatible compilers support #pragma once #if defined(_MSC_VER) && (_MSC_VER >= 1020) # pragma once #endif /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 // serialization/map.hpp: // serialization for stl map templates // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . // Use, modification and distribution is subject to the Boost Software // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) // See http://www.boost.org for updates, documentation, and revision history. #include <boost/unordered_map.hpp> #include <boost/config.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/collections_save_imp.hpp> #include <boost/serialization/collections_load_imp.hpp> #include <boost/serialization/split_free.hpp> namespace boost { namespace serialization { template<class Archive, class Type, class Key, class Compare, class Allocator > inline void save( Archive & ar, const boost::unordered_map<Key, Type, Compare, Allocator> &t, const unsigned int /* file_version */ ){ boost::serialization::stl::save_collection< Archive, boost::unordered_map<Key, Type, Compare, Allocator> >(ar, t); } template<class Archive, class Type, class Key, class Compare, class Allocator > inline void load( Archive & ar, boost::unordered_map<Key, Type, Compare, Allocator> &t, const unsigned int /* file_version */ ){ boost::serialization::stl::load_collection< Archive, boost::unordered_map<Key, Type, Compare, Allocator>, boost::serialization::stl::archive_input_map< Archive, boost::unordered_map<Key, Type, Compare, Allocator> >, boost::serialization::stl::no_reserve_imp<boost::unordered_map< Key, Type, Compare, Allocator > > >(ar, t); } // split non-intrusive serialization function member into separate // non intrusive save/load member functions template<class Archive, class Type, class Key, class Compare, class Allocator > inline void serialize( Archive & ar, boost::unordered_map<Key, Type, Compare, Allocator> &t, const unsigned int file_version ){ boost::serialization::split_free(ar, t, file_version); } // multimap template<class Archive, class Type, class Key, class Compare, class Allocator > inline void save( Archive & ar, const boost::unordered_multimap<Key, Type, Compare, Allocator> &t, const unsigned int /* file_version */ ){ boost::serialization::stl::save_collection< Archive, boost::unordered_multimap<Key, Type, Compare, Allocator> >(ar, t); } template<class Archive, class Type, class Key, class Compare, class Allocator > inline void load( Archive & ar, boost::unordered_multimap<Key, Type, Compare, Allocator> &t, const unsigned int /* file_version */ ){ boost::serialization::stl::load_collection< Archive, boost::unordered_multimap<Key, Type, Compare, Allocator>, boost::serialization::stl::archive_input_multimap< Archive, boost::unordered_multimap<Key, Type, Compare, Allocator> >, boost::serialization::stl::no_reserve_imp< boost::unordered_multimap<Key, Type, Compare, Allocator> > >(ar, t); } // split non-intrusive serialization function member into separate // non intrusive save/load member functions template<class Archive, class Type, class Key, class Compare, class Allocator > inline void serialize( Archive & ar, boost::unordered_multimap<Key, Type, Compare, Allocator> &t, const unsigned int file_version ){ boost::serialization::split_free(ar, t, file_version); } } // serialization } // namespace boost #endif // BOOST_SERIALIZATION_UNORDEREDMAP_HPP Best regards, SK -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01

2 1

Property Tree - adding child nodes to a parent
by Jon Shuler 30 Jan '10

30 Jan '10

I am trying to build a property tree from hierarchy data in a database. I want to be able to add a child at a given node using something similar to: parentNode.add_child("child name", data_type). There is a add_child method but it expects the path to add the child at. I looked at the examples and did not see anything. Is this possible? Jon This e-mail message and any attachment(s) transmitted with it are intended only for the use of the recipient(s) named above.This message may be privileged and/or confidential. If you are not an intended recipient, you may not review, copy or distribute this message. If you have received this communication in error, please notify us immediately by e-mail and delete the original message.

2 1

multi_index_container assertion after crash
by Eli Zakashansky 26 Jan '10

26 Jan '10

Hi, I have an application which uses a persistent multi_index_container (I am using bip::managed_mapped_file && after openning the file I do "container = mappedFile->find_or_construct(...)"). I have an interesting behavior when my process crashes/stopped during massive use of the multi_index_container after the process restarts I don't experience any problems reading or inserting new elements to the container but if I try to erase elements or call mutli_index_container::clear (Debug mode only BOOST_MULTI_INDEX_ENABLE_SAFE_MODE is defined) an assertion pops up (safe_mode::Check_same_owner / safe_mode::Check_valid_iterator). At first I thought that this kind of assertion fails due to concurrency issue, but it is not the case (I verified that this data structure is not accessed from more than one thread at a time, during this time the container is locked). Does anyone has any idea what can cause this situation? Or has a resolution ? Thanks a lot in advance, Eli.

5 16

[BoostCon 2010] Final Call for Participation
by Hartmut Kaiser 24 Jan '10

24 Jan '10

Please distribute! -------------------------------- 4th Annual Boost Conference 2010 -------------------------------- Aspen CO, USA, May 10-14, 2010, www.boostcon.com Final Call for Participation -------------------------------- Important dates: Proposal submissions Extended to January 3, 2010 Proposals decisions sent January 25, 2010 (tentative program available) Fully scheduled program available February 10, 2010 Session materials due April 15, 2010 -------------------------------- We invite you to submit session proposals to the 4th Annual Boost Conference: BoostCon 2010 (Aspen CO, USA, May 10-14, 2010). Traditionally the main face-to-face event for all things Boost (www.boost.org) BoostCon 2010 will present leading speakers from the whole C++ community. From using the Boost libraries to writing and maintaining them, from evangelizing to deploying Boost within your organization, from infrastructure and process to vision and mission, and the new C++ Standard, BoostCon brings together the sessions, the colleagues, and the inspiration to support your work with C++ and Boost in particular for the next year. To reflect the breadth of the Boost community, the conference includes sessions aimed at two constituencies: Boost end-users and hard-core Boost library and tool developers. The program fosters interaction and engagement within and across those two groups, with an emphasis on hands-on, participatory sessions. Session topics -------------- Topics of interest include, but are not restricted to, the following: * General tutorial sessions introducing one or more Boost libraries * In-depth sessions on using specific Boost libraries * Case studies on using Boost * Experts panels * Advanced sessions on implementation techniques used within Boost libraries * C++0x and how it will change life for users and library writers * Development workshops to extend or enhance existing Boost libraries * Workshops on design process * Infrastructure workshops such as Build tools, Website, Testing * Concepts and Generic Programming * Hardware and infrastructure presentations focused on how libraries can make better use of the technology * Other topics likely to be of great interest to Boost users and developers Interactive and collaborative sessions are encouraged, as this is the nature of both the on-line Boost community and the style of learning and participation that has proven most successful at such events. Sessions can be tutorial based, with an emphasis on interaction and participant involvement, or workshop based, whether hands-on programming or paper-based, discussion-driven collaborative work. Session formats --------------- Presentations Presentations focus on a practitioner's ideas and experience with anything relevant to Boost and Boost users. Panels Panels feature three or four people presenting their ideas and experiences relating to Boost's relevant, controversial, emerging, or unresolved issues. Panels may be conducted in several ways, such as comparative, analytic, or historic. Tutorials Tutorials are sessions at which instructors teach conference participants specific Boost-relevant skills. Workshops Workshops provide an active arena for advancements in Boost- relevant topics. Workshops provide the opportunity for experienced practitioners to develop new ideas about a topic of common interest and experience. Author's Corner Presentations These were introduced at BoostCon 2008, and were a great success. They are short (30 minute) sessions, focusing on tips on usage and design. In addition, we're looking to uncover the hidden design gems in Boost libraries. Tool Vendors Presentations We actively encourage tool vendors and ISP's to submit proposals for a special Tool Vendors Session Track aimed at products related to Boost and C++ (compilers, libraries, tools, etc.). Other formats may also be of interest. Don't hold back a proposal just because it doesn't fit into a pigeonhole. Submitting a proposal --------------------- Standard Sessions are 90 minutes. You may submit a proposal for fractions or multiples of 90-minutes. Fractional proposals will be grouped into 90 minute sessions covering related topics. Longer sessions, such as tutorials and classes, will be assigned 90 minute, three hour (i.e. half day), or six hour (i.e. full day) time slots. Please include: * The working title. * Type of session: presentation, panel, tutorial, workshop, authors corner, vendor track, other. * A paragraph or two describing the topic covered, suitable for the conference web site. * Proposed length: 10-20 minute short talks, 45 minutes, 90 minutes, half day, full day. * Alternate lengths, if you are willing to make adjustments: 10-20 minute short-talks, 45 minutes, 90 minutes, half-day, full day. * Audience: users, developers, both. * Level: basic, intermediate, advanced. * A biography, suitable for the conference web site. * Your contact information (will not be made public). Submission details ------------------ All submissions have to be done through the EasyChair conference management system: http://www.easychair.org/conferences/?conf=boostcon10. If you have not already registered at EasyChair, you will need to do so in order to submit your proposal. All submissions will go through a peer review process. Authors are invited (but are not required) to submit PDF versions of full papers of up to 10 pages in ACM conference proceedings format (see http://www.acm.org/sigs/publications/proceedings-templates) The full papers are not required unless you want them published in the proceedings. All accepted proposals will be made available in the Association for Computing Machinery (ACM) Digital Library (approval pending). Best papers, after further reviews, will be considered to be book chapters or journal articles in a renowned journal. The session materials go on the BoostCon website and will be available to attendees. For general information on the BoostCon 2010 paper submission or the scope of technical papers solicited, please refer to the conference website at www.boostcon.com. For any other questions about the submission process or paper format, please contact the Program Committee at boostcon10(a)easychair.com. If you have any technical problems with EasyChair, please contact EasyChair for help. Note: Presenters must agree to grant a non-exclusive perpetual license to publish submitted materials, either electronically or in print, in any media related to BoostCon. Hartmut Kaiser, email: hartmut.kaiser(a)gmail.com (Program Committee Chair) David Abrahams, email: dave(a)boostpro.com (Conference Chair) On behalf of the conference organizers

5 4

[iterators][range][rangeex] range concatenation
by Dmitry Vinogradov 12 Jan '10

12 Jan '10

Is it possible with Boost (or RangeEx) to concatenate ranges? Sample usage: template <class Range> void process_range(Range const &); std::vector<foo> v = ...; std::list<foo> l = ...; process_range(concat(v, l));

5 18

Defining Statements with Proto
by David A. Greene 08 Jan '10

08 Jan '10

A few years ago, I asked how to define a grammar with Proto to match something like this: if_(expr) [ stmt, stmt, ... ].else [ stmt, stmt, ... ]; The answer was to do this: struct Grammar; struct ExpressionGrammar; struct StatementGrammar; struct Domain; template<typename Expr> struct Expression : proto::extends<Expr, Expression<Expr>, Domain> { typedef proto::extends<Expr, Expression<Expr>, Domain> base_type; Expression(Expr const & expr = Expr()) : base_type( expr ) {} }; struct Domain : proto::domain< proto::generator< Expression >, Grammar> {}; struct If {}; BOOST_PROTO_DEFINE_FUNCTION_TEMPLATE( 1 , if_ , Domain , (If) , BOOST_PP_SEQ_NIL ); // Here is the grammar for if_ statements // matches if_(e1)[e2] struct IfGrammar : boost::proto::subscript< boost::proto::arg< boost::proto::unary_expr< If, ExpressionGrammar >, >, StatementGrammar > {}; // An else_ "operator" template<typename Expr> struct Expression< Expr , typename enable_if<proto::matches<Expr, IfGrammar> >::type > : proto::extends<Expr, Expression<Expr>, Domain> { Expression() : else_(proto::make_expr<Else>(*this)) {}; proto::result_of::make_expr< Else, // else is now an "operator" Expression<Expr> const >::type const else_; }; // matches if_(e1)[e2].else_[e3] struct IfElseGrammar : boost:proto::subscript< boost::proto::arg< boost::proto::unary_expr< Else, IfGrammar >, >, StatementGrammar > {}; I didn't understand it then and I don't now. :) However, it seems to be obsolete since BOOST_PROTO_DEFINE_FUNCTION_TEMPLATE doesn't seem to exist anymore (it's not documented, anyway). So how would this be formulated in modern Boost.Proto? I'm guessing I will need an expression template wrapper (called Expression<> above) that uses some combination of BOOST_PROTO_BASIC_EXTENDS, BOOST_PROTO_EXTENDS_SUBSCRIPT and BOOST_PROTO_EXTENDS_FUNCTION. But of course not all statements have a valid operator() overload and no expressions do. I guess the grammar will take care of that, yes? I'm really puzzled about how to do the ".else_" part. I was hoping I could look to Phoenix to get a clue but it doesn't seem to use Proto. Any help? Thanks! -Dave

3 12

[Math/Statistical Distributions+Random] Random number generation
by Marco Guazzone 07 Jan '10

07 Jan '10

Hi all! I'm a "boost newbie" so sorry for too trivial questions. Just trying to use boost for some statistical experiments, involving statistical distribution fitting, quantile generation (for goodness-of-fit tests), random variate generation, and so on. . The "Math/Statistical Distribution" library is great and almost complete. But I'm just curious why the random number generation (provided by the "Random" lib) and this library have not been integrated. For instance, the boost::random::exponential_distribution and the boost::math::exponential_distribution are two different worlds. I think a function like this below would be very helpful: --- [snip] --- template <typename Generator, typename RealType, typename Policy> inline RealType rand(Generator& rng, const exponential_distribution<RealType, Policy>& dist) { return -1.0 / dist.lambda() * std::log(1.0-rng()); } --- [snip] --- or something similar (e.g., rand implemented as a class method) In this case only two objects are needed: * boost::random::mersenne_twister * boost::math::exponential_distribution Instead, actually I have to keep different objects. For instance, for the exponential distribution: * boost::random::exponential_distribution * boost::random::mersenne_twister * boost::random::variate_generator * boost::math::exponential_distribution Unluckely I can't use boost::math::exponential_distribution in place of boost::random::exponential_distribution since boost::random::variate_generator expects a specific interface for the distribution. Well, what is the rationale behind the choice of this separation? Do you think would be useful to provide this kind of integration? Thank you very much in advance!! Cheers -- Marco

4 13

[thread] Getting this warning message with optimization turn on
by Shiou Ming Lee 07 Jan '10

07 Jan '10

Hi, I'm building my program that depends on Boost.thread, but getting following warning message, only when compiler's optimization been turn on. C:/boost_1_41_0/boost/thread/win32/thread_heap_alloc.hpp: In member function `bool gUtil::GLog::LogWriterManager::startAsyncLogging(unsigned int)': C:/boost_1_41_0/boost/thread/win32/thread_heap_alloc.hpp:156: warning: 'heap_memory' might be used uninitialized in this function In the mentioned function, startAsyncLogging(unsigned int), there's only one line of code that involves Boost.thread: // loggingThread is class LogWriterManager's member, of boost::thread type. loggingThread = boost::thread(boost::bind(&LogWriterManager::loggingThreadFunc, this)); This happens for MinGW 3.4 on Windows Vista SP1 32-bits, but not for GCC 4.4 on Fedora 11 x86. The Boost release is of version 1.41.0. Any idea what should I do for this warning message? Or should I just leave optimization on and ignore this message? Thanks & Regards Shiou Ming

3 3

[GIL] Packing to 6 bytes
by Eloi Du Bois 06 Jan '10

06 Jan '10

Hi, I have a question: I need to create a view that hold 12 bit channel data packed as follow: 0000R0000G0000B0000;0000R0000G0000B0000;0000R0000G0000B0000;.... Meaning that each channel is shifted by 4 bits. The pixel is holden on 48 bits = 6 bytes. I have created my view like as follow: /// My 12 bits special rgb packed to 6 bytes typedef const packed_channel_reference<uint64_t, 04, 12, true> rgb12_packed_channel0_t; typedef const packed_channel_reference<uint64_t, 20, 12, true> rgb12_packed_channel1_t; typedef const packed_channel_reference<uint64_t, 36, 12, true> rgb12_packed_channel2_t; typedef mpl::vector3<rgb12_packed_channel0_t, rgb12_packed_channel1_t, rgb12_packed_channel2_t> rgb12_packed_channels_t; typedef packed_pixel<packed_channel_value<48>, rgb12_packed_channels_t, rgb_layout_t> rgb12_packed_pixel_t; typedef view_type_from_pixel<rgb12_packed_pixel_t>::type rgb12_packed_view_t; The thing is that I would now like to copy data to another rgb16_view_t... But this is not working because, in my opinion, 48 bits is between 32 and 64. I have been thinking of the solution that Christian gave me and that consist on doing something like this: T p( pData, 0 ); for( typename DST_V::y_coord_t y = 0; y < height; ++y ) { typename DST_V::x_iterator it = dst.row_begin( y ); for( typename DST_V::x_coord_t x = 0; x < width; ++x ) { color_convert( *p, *it ); ++p; ++it; } } where T is a bit_aligned_pixel_iterator and DST_V=rgb16_view_t but this can't be working on my case because channels are shifted by 4 bits ! If you could help me, I would really appreciate. I think all those cases are a good robustness test for gil. Regards, Eloi.

3 3

Re: [Boost-users] [unit_test_framework] checkpoints for BOOST_CHECK*?
by rozelak＠volny.cz 04 Jan '10

04 Jan '10

> > rozelak(a)volny.cz wrote: > >> rozelak(a)volny.cz wrote: > >> > >>> Is there a way how to achieve what I am looking > >>> for? > >>> >>> > >> Use BOOST_TEST_MESSAGE and set log level to message > >> >> > > > > Yes, I have read about this option and it works - > > thank you. I consider > > > it as not perfect, but working solution. > > > > However, I want to ask, if the idea of checkpoints > > could be generalised > > > and used during check failure printing as well (as > > has been suggested > > > in the example in my first post). > > I don't know boost source in depth, but it seems > > that BOOST_TEST_CHECKPOINT > > > just calls boost::unit_test::unit_test_log.set_checkpoint(...), > > > > > > > > which > > > stores the checkpoint info in unit_test_log (which > > is supposed to be > > > singleton). > > Would, therefore, be possible to print the checkpoint > > stored also when > > > test failure is printed? May I be helpfull somehow > > to do this? > > > > > Or is it against the idea of the checkpoints? > > > > I think the issue is that BOOST_CHECK and friends set > a checkpoint. > I see, you are right. It is set by BOOST_TEST_PASSPOINT() macro. Well, do you think, that it would be beneficial to define new macro, e.g. BOOST_TEST_FAILRECORD (please suggest a better name, if you have one)? The macro would be implemented in the way very similar to BOOST_TEST_CHECKPOINT, but the data "recorded" by the macro would be printed only when a testcase fails or an unexpected exception occurs. It also has the advantage, that when not used, it does not affect the current behaviour of boost. Is there a change to accept it in the boost test framework, if I try to implement it? Thank you for suggestions/comments, Dan

3 7

[Wave] Modifying the way function-like macros are interpreted
by fractured＠modularsystems.sl 04 Jan '10

04 Jan '10

I am trying to use boost::wave as a preprocessor for LSL, a language used in the virtual world Second Life. There is a data type there for collections of data, but it can only be accessed through functions such as llList2String(list,iterator); I wanted to define macros that would allow me to do something like #define x[y] llList2String(x,y), however, wave as it stands does not seem to have any immediately obvious way to do this.

4 6

[test] Unexpected Exceptions
by Florian Winter 04 Jan '10

04 Jan '10

Hi, What is the intended behavior of Boost.Test if an unexpected exception is thrown? Example: void do_not_throw() throw() { throw "unexpected"; } Some of my applications using Boost.Test seem exit with an error code of 0 (successful) if an unexpected exception is thrown. Is this the intended behavior? Best regards, fw

3 5

alignment question
by Slawomir Lisznianski 03 Jan '10

03 Jan '10

I'm having trouble implementing properly aligned storage. The following example shows conceptually what I'm trying to do, but it's NOT a correct way of doing it. template <typename T> struct envelope { size_t len = sizeof(T); // <--- compiler may pad here, hence this doesn't work... T body; }; So, given an arbitrary type T, we want to create an envelope that will have the size of T immediately before it, with no padding between len and body. The user would then be able to: envelope<MyStruct> env; env.body.x = ... send(env); I'm curious if anyone has run into something similar and have a clean solution. Our code currently has to defer to temporary buffers and memcpy'ing data back to it. Thanks, Slaw

3 2

[boost] [program options] Recommended way to specify a list of strings
by Sanjit Jhala 01 Jan '10

01 Jan '10

Say I want to specify a list of servers via the boost program_options library. Something like: --total-servers N --server srv1 --server srv2 ... --server srvN How would I do this? It doesn't look like multitoken would work for this case, so would it be better for me to just have something like: --total-servers N --serverlist srv1 srv2 ... srvN and use a single string to store the serverlist and parse it myself? -Sanjit

4 6

Boost unit test framework and the "system" system call under Linux.
by Avila Mathieu 31 Dec '09

31 Dec '09

Hello, I'm a bit new to Boost, so please don't throw rocks at me if this sounds stupid. I have a simple module that allows to wrap an external command execution using "system()". It returns a result that depends on the exit code. I want to unit test this with boost test, as I do for other modules. Unfortunately, it seems that the framework catches the signal of the child exit if it exits with a non-zero exit code. So that the unit test is aborted, which is not what I want. It seems the Execution Monitor is the solution to my problem. Is it ? How can I use it to prevent Boost from catching every signal ? Thanks in advance, -- Mathieu

2 1

[boost::python] How can I link python library against certain version?
by blp330 31 Dec '09

31 Dec '09

Hi, I try to upgrade my boost from 1.36 to 1.41, but it will link against python26.lib. My own python version is 2.5, How can I tell boost to link with python25.lib? Thanks. -- View this message in context: http://old.nabble.com/-boost%3A%3Apython--How-can-I-link-python-library-aga… Sent from the Boost - Users mailing list archive at Nabble.com.

1 0

[interprocess] mutex in shared memory, crash recovery
by Jerry Hicks 31 Dec '09

31 Dec '09

I know the correct answer is to avoid crashing while holding a mutex in shared memory ;-) But since I'm handing a system off to other developers I'd like to understand if there is a most correct way to 'scrub' a mutex in shared memory clean if a thread crashed while holding the mutex. Assume that at the point I would like to do this that there is only one thread attached to the shared memory and no possibility of any thread attempting to lock the (locked stagnant) mutex.

2 1

How to use boost thread & asio library without exception
by n179911 31 Dec '09

31 Dec '09

Hi, I am using boost's thread and asio library: #include <boost/asio.hpp> #include <boost/thread.hpp> But when I compile it, I get this error: /media/data/bin/boost/include/boost/exception_ptr.hpp:11:2: error: #error This header requires exception handling to be enabled. In file included from /media/data/bin/boost/include/boost/asio/detail/winsock_init.hpp:22, /media/data/bin/boost/include/boost/function/function_base.hpp:386: error: cannot use typeid with -fno-rtti Is there a way to use boost's thread and asio library without exception and rtti? Thank you.

2 2

Need help in setting up boost library in ubuntu 9.10
by n179911 31 Dec '09

31 Dec '09

I have compiled and installed my boost library in '/media/data/bin' in ubuntu 9.10. And I have setup the INCLUDE_PATH, LIBRARY_PATH env: $ echo $INCLUDE_PATH /media/data/bin/boost/include: $ echo $LIBRARY_PATH /media/data/bin/boost/lib: But when I compile the asio example, I get the following error: $ g++ blocking_tcp_echo_server.cpp blocking_tcp_echo_server.cpp:13:26: error: boost/bind.hpp: No such file or directory blocking_tcp_echo_server.cpp:14:31: error: boost/smart_ptr.hpp: No such file or directory blocking_tcp_echo_server.cpp:15:26: error: boost/asio.hpp: No such file or directory blocking_tcp_echo_server.cpp:16:28: error: boost/thread.hpp: No such file or directory blocking_tcp_echo_server.cpp:18: error: ‘boost’ has not been declared blocking_tcp_echo_server.cpp:22: error: ‘boost’ has not been declared blocking_tcp_echo_server.cpp:22: error: expected initializer before ‘<’ token blocking_tcp_echo_server.cpp:24: error: variable or field ‘session’ declared void blocking_tcp_echo_server.cpp:24: error: ‘socket_ptr’ was not declared in this sco $ g++ -I/media/data/bin/boost/include -L/media/data/bin/boost/lib blocking_tcp_echo_server.cpp /usr/bin/ld: /tmp/ccBXjXeh.o: in function server(boost::asio::io_service&, short):blocking_tcp_echo_server.cpp(.text+0x39e): error: undefined reference to 'boost::thread::~thread()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function server(boost::asio::io_service&, short):blocking_tcp_echo_server.cpp(.text+0x3c7): error: undefined reference to 'boost::thread::~thread()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function server(boost::asio::io_service&, short):blocking_tcp_echo_server.cpp(.text+0x3d8): error: undefined reference to 'boost::thread::~thread()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function __static_initialization_and_destruction_0(int, int):blocking_tcp_echo_server.cpp(.text+0x5ea): error: undefined reference to 'boost::system::get_system_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function __static_initialization_and_destruction_0(int, int):blocking_tcp_echo_server.cpp(.text+0x5f4): error: undefined reference to 'boost::system::get_generic_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function __static_initialization_and_destruction_0(int, int):blocking_tcp_echo_server.cpp(.text+0x5fe): error: undefined reference to 'boost::system::get_generic_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function __static_initialization_and_destruction_0(int, int):blocking_tcp_echo_server.cpp(.text+0x608): error: undefined reference to 'boost::system::get_generic_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function __static_initialization_and_destruction_0(int, int):blocking_tcp_echo_server.cpp(.text+0x612): error: undefined reference to 'boost::system::get_system_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::system::error_code::error_code():blocking_tcp_echo_server.cpp(.text._ZN5boost6system10error_codeC1Ev+0x10): error: undefined reference to 'boost::system::get_system_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::asio::error::get_system_category():blocking_tcp_echo_server.cpp(.text._ZN5boost4asio5error19get_system_categoryEv+0x7): error: undefined reference to 'boost::system::get_system_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::asio::detail::posix_thread::~posix_thread():blocking_tcp_echo_server.cpp(.text._ZN5boost4asio6detail12posix_threadD1Ev+0x1d): error: undefined reference to 'pthread_detach' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::asio::detail::posix_thread::join():blocking_tcp_echo_server.cpp(.text._ZN5boost4asio6detail12posix_thread4joinEv+0x25): error: undefined reference to 'pthread_join' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::detail::thread_data_base::thread_data_base():blocking_tcp_echo_server.cpp(.text._ZN5boost6detail16thread_data_baseC2Ev+0x1b): error: undefined reference to 'vtable for boost::detail::thread_data_base' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::thread::thread<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >(boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > >, boost::disable_if<boost::is_convertible<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > >&, boost::detail::thread_move_t<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > > >, boost::thread::dummy*>::type):blocking_tcp_echo_server.cpp(.text._ZN5boost6threadC1INS_3_bi6bind_tIvPFvNS_10shared_ptrINS_4asio19basic_stream_socketINS5_2ip3tcpENS5_21stream_socket_serviceIS8_EEEEEEENS2_5list1INS2_5valueISC_EEEEEEEET_NS_10disable_ifINS_14is_convertibleIRSK_NS_6detail13thread_move_tISK_EEEEPNS0_5dummyEE4typeE+0x66): error: undefined reference to 'boost::thread::start_thread()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >::~thread_data():blocking_tcp_echo_server.cpp(.text._ZN5boost6detail11thread_dataINS_3_bi6bind_tIvPFvNS_10shared_ptrINS_4asio19basic_stream_socketINS5_2ip3tcpENS5_21stream_socket_serviceIS8_EEEEEEENS2_5list1INS2_5valueISC_EEEEEEED1Ev+0x28): error: undefined reference to 'boost::detail::thread_data_base::~thread_data_base()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >::~thread_data():blocking_tcp_echo_server.cpp(.text._ZN5boost6detail11thread_dataINS_3_bi6bind_tIvPFvNS_10shared_ptrINS_4asio19basic_stream_socketINS5_2ip3tcpENS5_21stream_socket_serviceIS8_EEEEEEENS2_5list1INS2_5valueISC_EEEEEEED1Ev+0x42): error: undefined reference to 'boost::detail::thread_data_base::~thread_data_base()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >::~thread_data():blocking_tcp_echo_server.cpp(.text._ZN5boost6detail11thread_dataINS_3_bi6bind_tIvPFvNS_10shared_ptrINS_4asio19basic_stream_socketINS5_2ip3tcpENS5_21stream_socket_serviceIS8_EEEEEEENS2_5list1INS2_5valueISC_EEEEEEED0Ev+0x28): error: undefined reference to 'boost::detail::thread_data_base::~thread_data_base()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >::~thread_data():blocking_tcp_echo_server.cpp(.text._ZN5boost6detail11thread_dataINS_3_bi6bind_tIvPFvNS_10shared_ptrINS_4asio19basic_stream_socketINS5_2ip3tcpENS5_21stream_socket_serviceIS8_EEEEEEENS2_5list1INS2_5valueISC_EEEEEEED0Ev+0x42): error: undefined reference to 'boost::detail::thread_data_base::~thread_data_base()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function typeinfo for boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >:blocking_tcp_echo_server.cpp(.rodata._ZTIN5boost6detail11thread_dataINS_3_bi6bind_tIvPFvNS_10shared_ptrINS_4asio19basic_stream_socketINS5_2ip3tcpENS5_21stream_socket_serviceIS8_EEEEEEENS2_5list1INS2_5valueISC_EEEEEEEE+0x8): error: undefined reference to 'typeinfo for boost::detail::thread_data_base' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service<boost::asio::detail::epoll_reactor<false> > >::context>::~posix_tss_ptr():blocking_tcp_echo_server.cpp(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceINS1_13epoll_reactorILb0EEEEEE7contextEED2Ev+0xf): error: undefined reference to 'pthread_key_delete' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service<boost::asio::detail::epoll_reactor<false> > >::context>::posix_tss_ptr():blocking_tcp_echo_server.cpp(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceINS1_13epoll_reactorILb0EEEEEE7contextEEC2Ev+0x22): error: undefined reference to 'pthread_key_create' collect2: ld returned 1 exit status Thank you.

2 1

Proto Help
by David Greene 31 Dec '09

31 Dec '09

I am resurrecting some ancient code written back before Proto was an official Boost library. Things have changed quite a bit since then so I need to port the code. The code was never complete in the first place but I think much of it still applies. In any case, my goal is to take a Proto expression tree and transform it into another kind of tree using custom classes. Essentially it's an IR translation problem. Let's take an add node for example. Here's what I have so far: struct Base { ... }; struct Add : Base { ... }; // Custom expression nodes. // Transform a two-operand node. template<typename NodeType, typename Dummy = boost::proto::callable> struct ConstructBinary : boost::proto::callable { typedef boost:shared_ptr<NodeType> result_type; result_type operator()(boost::shared_ptr<Base> left, boost::shared_ptr<Base> right) { return result_type(new NodeType(left, right)); } }; struct ConstructExpressionGrammar; struct AddRule : boost::proto::plus<ConstructExpressionGrammar, ConstructExpressionGrammar> {}; // Want to use switch because of the large expression space. struct ConstructExpressionGrammarCases { // The primary template matches nothing: template<typename Tag> struct case_ : proto::not_<_> {}; }; // Match and construct an Add tree. template<> struct ConstructExpressionGrammarCases::case_<proto::tag::plus> : boost::proto::when<AddRule, // ?? ConstructBinary<Add>( ConstructExpressionGrammmar( boost::proto::_left), ConstructExpressionGrammmar( boost::proto::_right))> {}; struct ConstructExpressionGrammar : boost::proto::switch_<ConstructExpressionGrammarCases> {}; That's the basic outline. I don't think this is correct, however. In the grammar rule when<>, I'm not sure I can make a nested function type like that. I'm trying to tell the grammar to match the children and transform them, passing them to the ConstructBinary transformation to build the Add subtree. Any help is greatly appreciated. Thanks! -Dave

2 2

[lambda] Boost.Bind works, labmda bind fails to compile
by Igor R 30 Dec '09

30 Dec '09

Hello, Could someone please explain the following behavior: #include <boost/lambda/bind.hpp> #include <boost/bind.hpp> struct Functor { void operator()() const {} template<class T> void func(T t) {} }; int main() { Functor f; boost::lambda::bind(&Functor::func<Functor>, &f, f); // doesn't compile boost::bind(&Functor::func<Functor>, &f, f); // compiles well } Thanks!

4 8

c++: boost::multi_array - initialize a multi_array
by Hannan Sadar 30 Dec '09

30 Dec '09

Hi all, i am trying to initialize all the elements in boost::multi_array type to zero, so far, with out success. At tried using std::fill for 1-dim boost::multi_array and it worked. Once i tried std:fill on 2-dim boost::multi_array it haven't worked any more. I saw boost have #include <boost/assign/std/vector.hpp> // for 'operator+=()' #include <boost/assert.hpp>; libraries but i don't know if this is the correct way to initialize a 2-dim multi_array. I would like to know how to initialize a boost::multi_array in an elegant way. here is an example code of my multi_array (it pass compilation, but return an error at run time): #include <iomanip> #include "boost/multi_array.hpp" #include <iostream> namespace vec { typedef boost::multi_array<unsigned int, 1> uint_1d_vec_t; typedef boost::multi_array<unsigned int, 2> uint_2d_vec_t; typedef uint_1d_vec_t::index index_1d_t; typedef uint_2d_vec_t::index index_2d_t; } int main( ) { unsigned int num_elements, num_bits, max_runs, m; num_bits = 12; max_runs = 5000; m = 2; num_elements = ( 1 << num_bits ); int kappa = 79; vec::uint_1d_vec_t foo( boost::extents[ static_cast< vec::index_1d_t >(num_elements) ] ); vec::uint_2d_vec_t boo( boost::extents[ static_cast< vec::index_2d_t >(num_elements) ][ static_cast< vec::index_2d_t >(kappa) ] ); std::fill( foo.begin() , foo.end() , 0); std::fill( boo.begin()->begin() , boo.end()->end() , 0); std::cout << "Done" << std::endl; return EXIT_SUCCESS; } any suggestion is welcome regards

2 1

Fwd: [fusion] Using boost::mpl::fold with a fusion sequence
by Roberto Giménez 30 Dec '09

30 Dec '09

Hi. When I try to compile this: #include <boost/fusion/container/map.hpp> #include <boost/mpl/fold.hpp> int main(int argc, char** argv) { typedef boost::fusion::map < boost::fusion::pair<int, const char*>, boost::fusion::pair<long, char> > FuMap; FuMap fuMap("hello", 'w'); unsigned val = boost::mpl::fold < FuMap, boost::mpl::int_<0>, boost::mpl::next<boost::mpl::_1> >::type::value; } I get the following error: "...boost/mpl/begin_end.hpp", line 35: Error, nofieldfnd: apply is not a member of boost::mpl::begin_impl<boost::fusion::fusion_sequence_tag>. >From the fusion documentation: "Fusion provides full round compatibility with MPL. Fusion sequences are fully conforming MPL sequences and MPL sequences are fully compatible with Fusion. You can work with Fusion sequences on MPL if you wish to work solely on types." When I pass a boost::mpl::map it works. Any clues?

3 3

[Fwd: boost::bind vs. boost::lambda::bind - bug]
by Chris Hite 30 Dec '09

30 Dec '09

The code below fails to compile on g++ (GCC) 3.4.3: lambda_bind_test.cxx:9: error: `_1' undeclared (first use this function) lambda_bind_test.cxx:9: error: (Each undeclared identifier is reported only once for each function it appears in.) Commenting the include of boost::bind fixes it. How can the second header hide types defined in the first header? Shall I report a bug in trac or reopen this one?: https://svn.boost.org/trac/boost/ticket/3075 Is there any way in the long run the two libraries could be unified? All the asio examples use boost::bind? Should developers starting out a new code base use just one? Which one? #include <boost/lambda/bind.hpp> #include <boost/bind.hpp> //comment this line out and it compiles int foo(const char*); void test(){ using namespace boost::lambda; bind(foo,_1); }

3 4

[serialization] Can't build first example from docs.
by Patrick Horgan 29 Dec '09

29 Dec '09

Help! And thanks:) Same error as on our code. I thought I'd go through all the documentation (BTW do you want notes on typos?) and come up to speed so I could figure out why our code (that someone else wrote), had this error. To my surprise, the first example I tried had the same no get_debug_info member error. What am I doing wrong? Using trunk Using gcc 4.4.1 or 4.5 Linux dell 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 16:20:31 UTC 2009 i686 GNU/Linux make example1 g++ -ggdb -ansi -pedantic -Wextra -Wwrite-strings -Wformat=2 -Wall -fstrict-aliasing -O3 -Wstrict-aliasing=3 -std=c++0x example1.cpp -o example1 In file included from /usr/local/include/boost/archive/detail/abi_prefix.hpp:11, from /usr/local/include/boost/archive/shared_ptr_helper.hpp:35, from /usr/local/include/boost/archive/text_iarchive.hpp:100, from example1.cpp:5: /usr/local/include/boost/config/abi_prefix.hpp:12:3: error: #error double inclusion of header boost/config/abi_prefix.hpp is an error In file included from /usr/local/include/boost/archive/detail/abi_suffix.hpp:14, from /usr/local/include/boost/archive/text_iarchive.hpp:122, from example1.cpp:5: /usr/local/include/boost/config/abi_suffix.hpp:13:3: error: #error Header boost/config/abi_suffix.hpp must only be used after boost/config/abi_prefix.hpp In file included from /usr/local/include/boost/archive/detail/interface_oarchive.hpp:24, from /usr/local/include/boost/archive/detail/common_oarchive.hpp:20, from /usr/local/include/boost/archive/basic_text_oarchive.hpp:32, from /usr/local/include/boost/archive/text_oarchive.hpp:31, from example1.cpp:4: /usr/local/include/boost/archive/detail/oserializer.hpp: In static member function ‘static void boost::archive::detail::save_pointer_type<Archive>::polymorphic::save(Archive&, T&)’: /usr/local/include/boost/archive/detail/oserializer.hpp:441: error: ‘const class boost::archive::detail::basic_pointer_oserializer’ has no member named ‘get_debug_info’ In file included from /usr/local/include/boost/archive/detail/interface_iarchive.hpp:23, from /usr/local/include/boost/archive/detail/common_iarchive.hpp:23, from /usr/local/include/boost/archive/basic_text_iarchive.hpp:31, from /usr/local/include/boost/archive/text_iarchive.hpp:24, from example1.cpp:5: /usr/local/include/boost/archive/detail/iserializer.hpp: In member function ‘virtual void boost::archive::detail::iserializer<Archive, T>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const’: /usr/local/include/boost/archive/detail/iserializer.hpp:176: error: there are no arguments to ‘get_debug_info’ that depend on a template parameter, so a declaration of ‘get_debug_info’ must be available /usr/local/include/boost/archive/detail/iserializer.hpp:176: note: (if you use ‘-fpermissive’, G++ will accept your code, but allowing the use of an undeclared name is deprecated) /usr/local/include/boost/archive/detail/iserializer.hpp: In member function ‘void boost::archive::detail::iserializer<Archive, T>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const [with Archive = boost::archive::text_iarchive, T = gps_position]’: example1.cpp:62: instantiated from here /usr/local/include/boost/archive/detail/iserializer.hpp:173: error: ‘get_debug_info’ was not declared in this scope example1.cpp: At global scope: example1.cpp: In instantiation of ‘void gps_position::serialize(Archive&, unsigned int) [with Archive = boost::archive::text_iarchive]’: /usr/local/include/boost/serialization/access.hpp:118: instantiated from ‘static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = gps_position]’ /usr/local/include/boost/serialization/serialization.hpp:74: instantiated from ‘void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = gps_position]’ /usr/local/include/boost/serialization/serialization.hpp:133: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = gps_position]’ /usr/local/include/boost/archive/detail/iserializer.hpp:182: instantiated from ‘void boost::archive::detail::iserializer<Archive, T>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const [with Archive = boost::archive::text_iarchive, T = gps_position]’ example1.cpp:62: instantiated from here example1.cpp:20: warning: unused parameter ‘version’ example1.cpp: In instantiation of ‘void gps_position::serialize(Archive&, unsigned int) [with Archive = boost::archive::text_oarchive]’: /usr/local/include/boost/serialization/access.hpp:118: instantiated from ‘static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = gps_position]’ /usr/local/include/boost/serialization/serialization.hpp:74: instantiated from ‘void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = gps_position]’ /usr/local/include/boost/serialization/serialization.hpp:133: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = gps_position]’ /usr/local/include/boost/archive/detail/oserializer.hpp:148: instantiated from ‘void boost::archive::detail::oserializer<Archive, T>::save_object_data(boost::archive::detail::basic_oarchive&, const void*) const [with Archive = boost::archive::text_oarchive, T = gps_position]’ example1.cpp:62: instantiated from here example1.cpp:20: warning: unused parameter ‘version’ make: *** [example1] Error 1 example.cpp is the first example in the serialization docs, reproduced here for completeness: #include <fstream> // include headers that implement a archive in simple text format #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> ///////////////////////////////////////////////////////////// // gps coordinate // // illustrates serialization for a simple type // class gps_position { private: friend class boost::serialization::access; // When the class Archive corresponds to an output archive, the // & operator is defined similar to <<. Likewise, when the class Archive // is a type of input archive the & operator is defined similar to >>. template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & degrees; ar & minutes; ar & seconds; } int degrees; int minutes; float seconds; public: gps_position(){}; gps_position(int d, int m, float s) : degrees(d), minutes(m), seconds(s) {} }; int main() { // create and open a character archive for output std::ofstream ofs("filename"); // create class instance const gps_position g(35, 59, 24.567f); // save data to archive { boost::archive::text_oarchive oa(ofs); // write class instance to archive oa << g; // archive and stream closed when destructors are called } // ... some time later restore the class instance to its orginal state gps_position newg; { // create and open an archive for input std::ifstream ifs("filename"); boost::archive::text_iarchive ia(ifs); // read class state from archive ia >> newg; // archive and stream closed when destructors are called } return 0; }

1 1

Boost.Python and _GLIBCXX_DEBUG
by Christoph Groth 29 Dec '09

29 Dec '09

Using boost 1.40 and gcc 4.3.4 (same problem occurs with gcc 4.4.2) I have the following problem. After compiling the attached python module with the command g++ -shared -fPIC -o kernel.so python.cc box.cc -lboost_python -I/usr/include/python2.5 and executing python run.py I get the error message *** glibc detected *** python: free(): invalid next size (fast): 0x0000000001a32a30 *** This error does not occur when the macro _GLIBCXX_DEBUG is not being defined. It also does not occur when the contents of python.cc and box.cc are put into one file. In more complicated programs defining _GLIBCXX_DEBUG can lead to a "Segmentation fault". Not defining _GLIBCXX_DEBUG also helps there. Is there a way to deal with this short of not defining _GLIBCXX_DEBUG? Could it be a bug in Boost.Python? Thanks in advance, Christoph here are the files: file python.cc: **************************************************************** #include <boost/python.hpp> #define _GLIBCXX_DEBUG #include <vector> #include "box.hh" using namespace boost::python; BOOST_PYTHON_MODULE(kernel) { class_<Box>("Box", init<> ()) ; } **************************************************************** file box.cc **************************************************************** #define _GLIBCXX_DEBUG #include "box.hh" Box::Box() { } **************************************************************** file box.hh **************************************************************** #ifndef BOX_HH #define BOX_HH #include <vector> class Box { public: Box(); private: std::vector<int> blocks; }; #endif // BOX_HH **************************************************************** file run.py **************************************************************** #!/usr/bin/env python import kernel sys = kernel.Box() ****************************************************************

2 1

[property tree] Property Tree equivalent for matching nodes with specific child data?
by Jesse Perla 29 Dec '09

29 Dec '09

The property tree library looks like a very good way for me to remove the tinyxpath and tinyxml dependencies in my project. However, I am confused by one usage pattern. I have a lot of properties like the following: <top> <struct1 name="bla"> <stuff> data specific to struct1 </stuff> <struct1/> <struct1 name="bla2"> <stuff> data specific to struct1 </stuff> <struct1/> <struct2 name="bla3"> <stuff2>data specific to struct2 </stuff2> <struct1/> </top> I need to be able to get the tree given the name. In xpath I would go something like: ""/top/struct1[@name='bla']/stuff" to get at that information. I realize I could embed a <name> underneath the struct1 in xpath as well, but how do I get back to the siblings? Any ideas on how best to use property tree for this kind of pattern? Thanks, Jesse

1 0

[asio] posting a function to an io_service object
by Vilhelm Sundberg 29 Dec '09

29 Dec '09

Hi, I am trying to call a function by posting it to an io_service object running in a different thread from the main thread of the application. The problem is the function always gets called from the main thread. Basically I would like to do this with asio: #include <iostream> #include <boost/thread.hpp> using namespace std; void f() { cout << boost::this_thread::get_id() << endl; } int main(int argc, char *argv[]) { cout << "main thread: " << boost::this_thread::get_id() << endl; boost::thread t1(f); boost::thread t2(f); t1.join(); t2.join(); return 0; } The output is: main thread: 0x9739628 0x97392e8 0x9739488 Using Boost.Asio, f() always gets called from the main thread: #include <iostream> #include <boost/bind.hpp> #include <boost/thread.hpp> #include <boost/asio.hpp> using namespace std; using namespace boost::asio; void f() { cout << boost::this_thread::get_id() << endl; } int main(int argc, char *argv[]) { io_service ios1; io_service ios2; io_service::work w1(ios1); io_service::work w2(ios2); io_service::strand s1(ios1); io_service::strand s2(ios2); boost::thread t1(boost::bind(&io_service::run, &ios1)); boost::thread t2(boost::bind(&io_service::run, &ios2)); cout << "main thread: " << boost::this_thread::get_id() << endl; //s1.post(f); //s2.post(f); ios1.post(s1.wrap(f)); ios2.post(s2.wrap(f)); while (ios1.poll() > 0) ; while (ios2.poll() > 0) ; ios1.stop(); ios2.stop(); t1.join(); t2.join(); return 0; } The output is: main thread: 0x9739628 0x9739628 0x9739628 What is the correct way of posting/dispatching a function to an io_service running in a different thread, so that function is called from that thread? Thanks Vil

3 5

Thread function deletion
by Alexander Gutenev 29 Dec '09

29 Dec '09

Why does boost::thread destroys its thread function only on boost::thread object destruction and not just after thread function returns?

1 0

Compiling version 1.41 with /clr
by Dominique Aigroz 29 Dec '09

29 Dec '09

Dear all, I've upgraded from 1.39 to 1.41 and now I've got an error when compiling. error C2711: 'boost::detail::future_waiter::all_futures_lock::all_futures_lock' : this functon cannot be compiled as managed, consider using #pragma unmanaged 1> #pragma unmanaged is in effect 1> C:\Kadeo\Dev9\Thirdparty\boost_1_41_0\boost/thread/ future.hpp(411) : see source of the previous compiler diagnostic 1>C:\Kadeo\Dev9\Thirdparty\boost_1_41_0\boost/thread/future.hpp (416) : error C3821: 'boost::detail::future_waiter::all_futures_lock::all_futures_lock (std::vector<_Ty> &)': managed type or function cannot be used in an unmanaged function 1> with 1> [ 1> _Ty=boost::detail::future_waiter::registered_waiter 1> ] My dll is compiled with /clr flag, but i put #pragma unmanaged before include the boost header files. Does anyone have a solution for that problem. Regards, Dominique

2 2

[asio] Echo server demo
by Michael Fowler 29 Dec '09

29 Dec '09

Hello. I tried using the code provided here: http://www.boost.org/doc/libs/1_41_0/doc/html/boost_asio/example/echo/block… to echo text back to a client but I haven't been successful. It seems to hang at > size_t length = sock->read_some(boost::asio::buffer(data), error); when the client sends a message. What is wrong? Thanks.

1 0

Boost.Range fancify please
by anony 29 Dec '09

29 Dec '09

I have this variable definition: float vertices[][3] = { {-1, -1, 1}, {1, -1, 1}, {1, 1, 1}, {-1, 1, 1}, {-1, -1, -1}, {1, -1, -1}, {1, 1, -1}, {-1, 1, -1} }; I want to scale all elements of vertices, by some constant, for now I do it like this: BOOST_FOREACH(float& f, boost::make_iterator_range( boost::begin(vertices[0]), boost::end(vertices[7]))) { f *= scale; } But maybe something more beautiful could be done with Boost.Range?

4 11

[Iterator] Interest in bzip2 compress/decompress iterators
by Jason Felice 28 Dec '09

28 Dec '09

I've written them for a work project. It would need to be essentially rewritten for Boost (different coding standards), but I'm willing to do it if there's interest and it would likely be accepted. It would depend on bzlib (part of bzip2) being installed. I noticed there's a gzip iostream, but no gzip iterator. This is a kind of precedent for the external dependency aspect. I've also written a class which produces a tar file in a streaming fashion to an output iterator. File contents are streamed in from input iterators. I'm not sure if this is useful or where it would go.

2 2

Re: [Boost-users] asio: sys/epoll.h
by Pascal Kesseli 28 Dec '09

28 Dec '09

Ah, that could indeed do the trick! I will give it a shot immediately and report back here. Thanks a lot and best regards Pascal

1 0

Problem with boost::any_cast on SUN CC 5.10
by Alexander Vinokur 28 Dec '09

28 Dec '09

Hi, I have the following problem. Here is some program. File myFile1.cpp #include <boost/any.hpp> int main() { long myLongValue = 123; long long myLongLongValue = 123; boost::any_cast<long>(myLongValue); boost::any_cast<long long>(myLongLongValue); return 0; } Compilation on machine1 machine1> uname -a SunOS machine1 5.10 Generic_127111-11 sun4v sparc SUNW,SPARC-Enterprise-T5220 machine1> CC -V CC: Sun C++ 5.9 SunOS_sparc Patch 124863-01 2007/07/25 machine1> CC -m64 -I/local64/boost_1_34_0 myFile1.cpp machine1> // No errors Compilation on machine2 machine2> uname -a SunOS machine2 5.10 Generic_139555-08 sun4u sparc SUNW,SPARC-Enterprise machine2> CC -V CC: Sun C++ 5.10 SunOS_sparc 128228-03 2009/11/05 Usage: CC [ options ] files. Use 'CC -flags' for details machine2> CC -m64 -I/local64/boost_1_34_0 myFile1.cpp "myFile1.cpp", line 7: Error: Could not find a match for boost::any_cast<boost::ValueType>(long) needed in main(). "myFile1.cpp", line 8: Error: Could not find a match for boost::any_cast<boost::ValueType>(long long) needed in main(). 2 Error(s) detected. Any suggestions? Thanks, Alex Vinokur AMDOCS > CUSTOMER EXPERIENCE SYSTEMS INNOVATION This message and the information contained herein is proprietary and confidential and subject to the Amdocs policy statement, you may review at http://www.amdocs.com/email_disclaimer.asp

1 0

[GIL] planar view with different bit depth
by Eloi Du Bois 28 Dec '09

28 Dec '09

Hi all, I have a question. I am using gil to read exr image files (movie standard) and I would like to know can I make a planar view with n channels of different pixel bit depth... That sound weird but the exr standard allow users to put channels of different types ! For example: R = unsigned int 32 G = half float B = float A = byte Thank you, Eloi.

3 3

[BGL] A* queue size not mutable
by Arnaud Masserann 26 Dec '09

26 Dec '09

Hi, I'm using the BGL to explore an implicit graph. At the beginning, I only have one node, and no arc. And I instanciate new nodes and their corresponding arc on-the-fly in the A* visitor ( in examine_vertex ). However, the A* algorithm internally uses this queue : MutableQueue Q(num_vertices(g), icmp, index_map); which means that I'm supposed to : - know how many vertices I'm gonna need during the search, which I don't - Instanciate them all... Any hints here ? Notes : I use astar_search_no_init, and property maps based on std::map so that put() can index it in a not-known-yet location. Btw, my color map type is std::map<NodeID,boost::default_color_type > (plus the wrapper around it). I feel that using "boost::default_color_type" is kind of a hack. Is it ? Thanks Arnaud Arnaud

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Re: [Boost-users] Dynamically creating new units
by Brandon Olivares 26 Dec '09

26 Dec '09

Hi, Oh, sorry, I forgot to specify that I was talking about the Boost.Units library. Brandon On 2009-12-25, Brandon Olivares wrote: > Hi, > > I posted before about having a problem with having so many units that it > takes forever to install. I was thinking about trying to perhaps > dynamically create only the ones I need, because I can't know that at > compile-time. > > Mostly it would be scaled units. For instance I might have the unit > meter, but might want to create a scaled unit, say like kilometer or > millimeter. > > Also though I wouldn't mind being able to create some of the > astronomical units when necessary, such as parsec or light year. But > in all cases, the base units already exist. > > What would be the best way to do this? > > Thanks, > Brandon > > -- > www.creatorspiritus.com > Blog and forum discussing living a Christ-centered life Follow me on > Twitter: http://twitter.com/devbanana Follow creatorspiritus.com on > Twitter: http://twitter.com/creatorspiritus -- Brandon www.creatorspiritus.com Blog and forum discussing living a Christ-centered life Follow me on Twitter: http://twitter.com/devbanana

4 13

[Serialization] Unregistered_class exception
by elizabeta petreska 25 Dec '09

25 Dec '09

Hello And I am sorry for bothering again The last couple of weeks I am trying to implement saving projects future in my program with boost serialization. However it seems that it is more hard that I think :) Now I am getting unregistered_class exception all over the place First some info about what I am trying to do : I am developing a plugin dll , which is loaded in third party main program. My plugin , say MyPlugin.dll , contains serialization code ( non intrusive save/load pair ) for classes which are defined in third party dll , say A.dll. A.dll is suppiled with my third party main program. Both A.dll and MyPlugin.dll are laoded at runtime in my main program. Only MyPlugin.dll ( and not A.dll and main program ) links with boost 1.41.0 staticly, if this is relevant at all. And I am using Visual Studio 2005. I think that I am getting this unregistered_class exception because somehow I am getting weird behavior from typeid operator ( maybe some bug), for particular class form A.dll. Note that the class have virtual methods. That is if I say : std::string s1=typeid(ON_Brep).raw_name(); ON_Brep someBrepObj; std:string s2=typeid(someTypeObj).raw_name(); s1 and s2 are not the same string. I am doing the following : /////////////////////MyPlugin.cpp //all archive classes are included here namespace boost { namespace serialization { template<class Archive> inline void save(Archive & ar,const ON_Brep& t,const unsigned int version) { boost::serialization::void_cast_register<ON_Brep, ON_Geometry>( static_cast<ON_Brep*>(NULL), static_cast<ON_Geometry *>(NULL)); //save ON_Brep here } template<class Archive> inline void load(Archive & ar,ON_Brep& t,const unsigned int version) { boost::serialization::void_cast_register<ON_Brep, ON_Geometry>( static_cast<ON_Brep*>(NULL), static_cast<ON_Geometry *>(NULL)); //load ON_Brep here } } } BOOST_SERIALIZATION_SPLIT_FREE(ON_Brep) BOOST_CLASS_EXPORT_GUID(ON_Brep, "ON_Brep") void CommandFunction() { ON_Brep* brep=GetBrepObject(); boost::archive::xml_oarchive oa(ofs); oa & BOOST_SERIALIZATION_NVP(brep); // fails to save with uregistered_class exception } The unregistered_exception is thrown before control gets to my nonintrusive save function for my ON_Brep Actually the exception is thrown in oserializer.hpp in line 376 : const boost::serialization::extended_type_info * true_type = i.get_derived_extended_type_info(t); // here throws if(NULL == true_type){ boost::serialization::throw_exception( archive_exception( archive_exception::unregistered_class, true_type->get_debug_info() ) ); } get_derived_extended_type_info is trying to get the eti record for ON_Brep, but I think that that it gets it wrong, because of the weird typeid behavior. get_derived_extended_type_info(const T & t) const { // note: this implementation - based on usage of typeid (rtti) // only does something if the class has at least one virtual function. BOOST_STATIC_WARNING(boost::is_polymorphic<T>::value); return typeid_system::extended_type_info_typeid_0::get_extended_type_info( typeid(t) ); /////// Here the typeid(t) differs from typeid(ON_Brep) <------------------1 } The thing is when I export ON_Brep with BOOST_CLASS_EXPORT_GUID(ON_Brep,"ON_Brep") extended_type_info entry is inserted in the global map, just typeid(ON_Brep) is inserted in the global map But when control gets to <-----1 the typeid(t) is different than the typeid that is entered in the global map,and just looking in the global map fails, becuase I have different behavior when I apply typeid(ON_Brep).raw_name();//this gives me ".?AVON_Brep@@" ON_Brep someBrepObj; typeid(someBrepObj).raw_name();// this gives me ".?.?AVTL_Brep@@" Anyone have seen such a thing ? Thanks for any help

3 4

help me with xpressive
by haccel 25 Dec '09

25 Dec '09

Cant compile in mingw ( QtCreator , Windows ) code with using boost xpressive. It talks " undeclared symbols - wsregex " . But with sregex ang cregex it works fine. Visual Studio compile wsregex fine , too. But GCC not. Found nex code in \boost\xpressive\xpressive_fwd.hpp - #if defined(BOOST_NO_CWCHAR) | defined(BOOST_NO_CWCTYPE) | defined(BOOST_NO_STD_WSTRING) # ifndef BOOST_XPRESSIVE_NO_WREGEX # define BOOST_XPRESSIVE_NO_WREGEX # endif #endif and later : #ifndef BOOST_XPRESSIVE_NO_WREGEX typedef basic_regex<std::wstring::const_iterator> wsregex; typedef basic_regex<wchar_t const *> wcregex; #endif What can i do? Thanx. -- View this message in context: http://old.nabble.com/help-me-with-xpressive-tp26842492p26842492.html Sent from the Boost - Users mailing list archive at Nabble.com.

2 1

Dynamically creating new units
by Brandon Olivares 25 Dec '09

25 Dec '09

Hi, I posted before about having a problem with having so many units that it takes forever to install. I was thinking about trying to perhaps dynamically create only the ones I need, because I can't know that at compile-time. Mostly it would be scaled units. For instance I might have the unit meter, but might want to create a scaled unit, say like kilometer or millimeter. Also though I wouldn't mind being able to create some of the astronomical units when necessary, such as parsec or light year. But in all cases, the base units already exist. What would be the best way to do this? Thanks, Brandon -- www.creatorspiritus.com Blog and forum discussing living a Christ-centered life Follow me on Twitter: http://twitter.com/devbanana Follow creatorspiritus.com on Twitter: http://twitter.com/creatorspiritus

1 0

Project using Boost.Units compiling slowly
by Brandon Olivares 25 Dec '09

25 Dec '09

Hi, I finally figured out how to use Boost.Units. But now it is compiling very slowly. It compiles in about 30 minutes on my local Windows machine using Cygwin, and in about 15 minutes on my remote CentOS server. There is very little code, but I am using a lot of units. Is there any way to speed it up? I don't know exactly how many units I'm using, because I have several macros for more easily defining them, but I know that there are many. Right now it is just a test program for testing out the units, but obviously I'll be expanding it soon and I'm worried that it is already taking so long to compile. Thanks, Brandon -- www.creatorspiritus.com Blog and forum discussing living a Christ-centered life Follow me on Twitter: http://twitter.com/devbanana Follow creatorspiritus.com on Twitter: http://twitter.com/creatorspiritus

2 3

[serialization] version handling in {save|load}_construct_data
by JOAQUIN M. LOPEZ MUÑOZ 24 Dec '09

24 Dec '09

Hello, I've taken a look at how the version number is dealt with in Boost.Serialization collection serialization code: * The relevant code at saving time is: if(3 < ar.get_library_version()){ const unsigned int item_version = version< BOOST_DEDUCED_TYPENAME Container::value_type >::value; ar << BOOST_SERIALIZATION_NVP(item_version); } * At loading time, the equivalent code is: unsigned int item_version; ar >> BOOST_SERIALIZATION_NVP(count); if(3 < ar.get_library_version()) ar >> BOOST_SERIALIZATION_NVP(item_version); else item_version = 0; Can someone (aka Robert :-) ) shed some light on this bit? Why the version number has to be given such manual processing when this is not needed if, for instance, serializating values via the simple ar&value? I'm trying to do the equivalent thing in Boost.MultiIndex. Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

1 0

Binary (non-character-based) file iterators
by Jason Felice 24 Dec '09

24 Dec '09

I'm looking for binary (value_type = unsigned char) input and output iterators for files. This is as opposed to a character base iterator (which rules out ostream_iterator<>). I don't need anything fancy (in fact, I'm just copying whole files to and from archives). I know that Sprit has an input iterator which is a forward iterator, and I could use that. I've already started to write them with Boost.Iterator; but this seems like something you should expect to find somewhere in boost already.

4 5

[serialization] extended_type_info has no member named get_debug_info
by Patrick Horgan 24 Dec '09

24 Dec '09

Building my own code against trunk I started getting this error. Anyone know off the top of your head what it is before I dig it out? archive/detail/oserializer.hpp:398:36: error: ‘const class boost::serialization::extended_type_info’ has no member named ‘get_debug_info’

2 1

[Iterators] Filtering and conversion
by Ruediger Berlich 24 Dec '09

24 Dec '09

Hi there, I'm playing with the iterators library at the moment. Say I have a std::vector<boost::shared_ptr<base> > , with base being the base class of derived1 and derived2. Pointers to derived1 and derived2 are stored in arbitrary order in the vector. Would it be possible to create an iterator that filters out the derived1 objects (including implicit conversion and possibly dereferencing of the resulting shared_ptr<derivedx>) ? So what I'm looking for is something like this: /*******************************************************/ main() { vector<base> x; for (int i=0; i<10; i++) { if(i%2==0) x.push_back(shared_ptr<derived1>(new derived1(i))); else x.push_back(shared_ptr<derived2>(new derived2(i))); } conversion_iterator<derived1> it(x.end()); // ++it will skip over derived2 objects and set itself // to x.end() if no derived1 is remaining for(it=x.begin(); it!=x.end(); ++it) { // Implies implicit conversion and dereferencing // of shared_ptr<base> it->someDerived1SpecificCall(); } } /*******************************************************/ The filter_iterator already does part of what I'd want here, but cannot help with the conversion part. I'm not asking for a solution to the above problem, just whether you think this can be done at all. I had the impression that the iterators library assumes that the types of the sequence being iterated over and the type being returned are identical. Also, while it=x.begin() can be handled by a conversion constructor. it!=x.end() does not appear to be accessible with the predefined comparison operators. In any case thanks and have a nice Christmas time, Ruediger

2 1

Re: [Boost-users] mpl/fusion: metafunction to 'rangify'
by Hicham Mouline 23 Dec '09

23 Dec '09

>> typedef >> boost::fusion::result_of::as_vector<boost::fusion::result_of::transform< >> params,make_fixed_or_range>::type>::type >> params_fixed_or_range; >> >> -Christopher >It does. >Of course, the return type of fusion::transform contains the compile-time >information required. >Thanks very much, >Now I'll look at spirit (and some magic code to generate the Qi parser for >this new sequence) to fill it up with values from an input stream. I have simplified the code to http://codepad.org/NDM2Ub7z I have a couple of needs now: 1. attempt to transform pfr back to params. This should succeed if all elements of the fusion sequence are fixed values and throw an exception if any of them is a range. Should I write this as a free floating function, as a conversion operator? 2. there will be many params types, params_1 .... params_n, each of those structs will yield after a fusion::transform the sequences params_fixed_of_range_1... params_fixed_of_range_n. I need the following behavior (I would write for this a free floating template function, templated on the sequence type : one of the params_fixed_of_range_i): template <typename params_fixed_of_range> void do_work(const params_fixed_of_range& seq_i) { /// /// generate a inner for loop for all the ranges in seq_i /// for e.g., if seq_i contains /// { d1= 5.; d2= 4.0..5.0..0.1; d3=-1.5..1.5..0.6; i4=4..26..1; i5=4; i6=0; i7=0; } /// then I would want to generate the following code, or if impossible /// maybe by runtime recursion /// for (double d2=4.0; d2<=5.0; d2+=0.1) for (double d3=-1.5; d3<=1.5; d3+=0.6) for (unsigned int i4=4; i4<=26; i4+=1) { // I know d1=5. i5=4 i6=0 i7=0 // construct a params frm current d1,d2,d3,i4,i5,i6,i7 // do some work based on params // return value, this will be used to plot graphs } }; This seems very doable with boost.fusion, and extremely complicated and not flexible without it. I realize there are a lot of questions into 1 email but appreciate the help you can give me, Best regards,

1 0

Possibly Memory Leaostks in Boost.Date_Time (Boost 1.41) ?
by Daniel Vallejos 23 Dec '09

23 Dec '09

Hello! Memory Leaks in Boost.Date_Time (Boost 1.41) ? Code: #include <boost/date_time.hpp> #include <iostream> using namespace boost::posix_time; using namespace std; int main() { time_duration interval = seconds(120); cout << "interval = " << interval << endl; } Valgrind profile: $ valgrind ./date_time_test ==8666== Memcheck, a memory error detector ==8666== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al. ==8666== Using Valgrind-3.5.0-Debian and LibVEX; rerun with -h for copyright info ==8666== Command: ./date_time_test ==8666== interval = 00:02:00 ==8666== ==8666== HEAP SUMMARY: ==8666== in use at exit: 1,595 bytes in 27 blocks ==8666== total heap usage: 48 allocs, 21 frees, 5,650 bytes allocated ==8666== ==8666== LEAK SUMMARY: ==8666== definitely lost: 0 bytes in 0 blocks ==8666== indirectly lost: 0 bytes in 0 blocks ==8666== possibly lost: 619 bytes in 20 blocks ==8666== still reachable: 976 bytes in 7 blocks ==8666== suppressed: 0 bytes in 0 blocks Environment: $ uname -a Linux electroforce 2.6.31-15-generic #50-Ubuntu SMP Tue Nov 10 14:53:52 UTC 2009 x86_64 GNU/Linux $ g++ --version g++ (Ubuntu 4.4.2-5ubuntu1) 4.4.2

3 2

Boost.Units - Can't figure out how to use it
by Brandon Olivares 23 Dec '09

23 Dec '09

Hi, I've been reading the documentation for Boost.Units. I understand most of what it is saying, but am still confused on how to do many things with this library. Most of the examples are using that test_system.hpp. Does this mean that you actually have to explicitly define the units you want to use? I am confused because I see the header files for the units I want to use, e.g., light_year or astronomical_unit, but I can't figure out how to actually use them. If I use boost::units::astronomical::light_second, it cannot find it. I am able to use the SI units just fine, such as: Quantity<si::length> l = 4.0 * si::meters; But beyond that, I'm lost. I also don't know which headers I should include. I don't know if there's one or two headers that include all the basics I would need, or if I have to include each of them individually. Here's a simple program I was trying to write just to test light_second, but do not know how to make it work or which headers to include: int main() { using namespace boost::units; using namespace boost::units::astronomical; using namespace std; quantity<light_second> l1 = 4.0 * light_second; cout << "l1 = " << l1 << endl; return 0; } I'm using Boost 1.41 and I'm on Windows using Cygwin. Thanks, Brandon -- www.creatorspiritus.com Blog and forum discussing living a Christ-centered life Follow me on Twitter: http://twitter.com/devbanana Follow creatorspiritus.com on Twitter: http://twitter.com/creatorspiritus

2 5

bjam? cmake?
by Roman Neuhauser 23 Dec '09

23 Dec '09

Hello, can someone explain to me what's been going on with Boost.Build? I cannot find a conclusive reference in the mailing lists, but it looks like bjam is being replaced with cmake. Is that right? If it is, how far has the effort gotten? I have a few tiny utilities written in C++ currently built and installed with GNU make, which I'd like to replace with something more portable, and I don't want to learn bjam and bbv2 if their replacement is around the corner. TIA -- Roman Neuhauser

3 4

[date_time] Delimiters are ignored
by Vadim Guchenko 23 Dec '09

23 Dec '09

Hello, All! Why the following code works while input string has wrong delimiters and too large value of seconds? #include <boost/date_time/posix_time/posix_time.hpp> #include <iostream> #include <sstream> #include <string> #include <locale> int main() { std::string str("08a02b61 15c10d2008"); std::istringstream is(str); is.imbue(std::locale(is.getloc(), new boost::posix_time::time_input_facet( "%H:%M:%S %d/%m/%Y"))); boost::posix_time::ptime ptime; is >> ptime; if (is) std::cout << ptime << "\n"; else std::cout << "Error\n"; } It outputs: 2008-Oct-15 08:03:01 -- Best regards, Vadim Guchenko [yhw at relost dot net].

1 0

iterator adaptor (complex->real)
by Neal Becker 23 Dec '09

23 Dec '09

I've been using an iterator adaptor to reinterpret between vectors of scalar and vectors of complex. Problem is, it relies on real(z) returning an lvalue. This is true in current gnu libstdc++, but looks like it's not in the current standard, and appears to be going away (real(z) will return rvalue). I need some help fixing this code in my complex_to_real iterator adaptor: template<typename BaseIterator> class const_c_to_r_adapt : public boost::iterator_adaptor< const_c_to_r_adapt<BaseIterator>, BaseIterator, typename std::iterator_traits<BaseIterator>::value_type::value_type, use_default, typename std::iterator_traits<BaseIterator>::value_type::value_type ... scalar_type & dereference() const { return (cnt % 2 == 0) ? real (const_cast<complex_type&>(*this- >base_reference())) : imag (const_cast<complex_type&>(*this- >base_reference())); } Changing it to return an rvalue is not acceptable. I need the functionality of returning an lvalue. Any ideas?

1 0

mpl/fusion: metafunction to 'rangify'
by Hicham Mouline 22 Dec '09

22 Dec '09

I am making small progress in my attempt to generate a new mpl sequence that I will use to read from a stream. The following code fails to compile: #include <boost/tuple/tuple.hpp> #include <boost/mpl/vector_c.hpp> #include <boost/mpl/transform.hpp> #include <boost/fusion/adapted/struct/adapt_struct.hpp> #include <boost/fusion/include/adapt_struct.hpp> #include <boost/fusion/mpl.hpp> // makes params a MPL sequence #include <boost/fusion/support/is_sequence.hpp> #include <boost/fusion/include/is_sequence.hpp> struct params { double d1; double d2; double d3; unsigned int i4; unsigned int i5; unsigned int i6; unsigned int i7; }; BOOST_FUSION_ADAPT_STRUCT( params, (double, d1) (double, d2) (double, d3) (unsigned int, i4) (unsigned int, i5) (unsigned int, i6) (unsigned int, i7) ) BOOST_MPL_ASSERT(( boost::fusion::traits::is_sequence<params> )); // passes template <typename T1> struct rangify { typedef boost::tuple<T1, T1, T1> type; /// min max incr }; template <typename T> struct fixed_or_range { typedef struct { union { T fixed; typename rangify<T>::type range; }; bool is_fixed; } type; }; typedef boost::mpl::transform< params, fixed_or_range<boost::mpl::_> >::type params_fixed_or_range; I understand that after the macro BOOST_FUSION_ADAPT_STRUCT , params is a fusion sequence. Including <boost/fusion/mpl.hpp> made params a MPL sequence, and therefore I can call boost::mpl::transform<> on it. The compilation error is c:\program files (x86)\boost_1_41_0\boost\mpl\clear.hpp(30) : error C2903: 'apply' : symbol is neither a class template nor a function template 1> c:\program files (x86)\boost_1_41_0\boost\mpl\transform.hpp(113) : see reference to class template instantiation 'boost::mpl::clear<Sequence>' being compiled 1> with 1> [ 1> Sequence=params 1> ] 1> c:\program files (x86)\boost_1_41_0\boost\mpl\eval_if.hpp(41) : see reference to class template instantiation 'boost::mpl::transform1<P1,P2,P3>' being compiled 1> with 1> [ 1> P1=params, 1> P2=fixed_or_range<boost::mpl::_1>, 1> P3=boost::mpl::na 1> ] 1> c:\program files (x86)\boost_1_41_0\boost\mpl\transform.hpp(138) : see reference to class template instantiation 'boost::mpl::eval_if<C,F1,F2>' being compiled 1> with 1> [ 1> C=boost::mpl::or_<boost::mpl::is_na<boost::mpl::na>,boost::mpl::is_lambda_ex pression<fixed_or_range<boost::mpl::_1>>,boost::mpl::not_<boost::mpl::is_seq uence<fixed_or_range<boost::mpl::_1>>>>, 1> F1=boost::mpl::transform1<params,fixed_or_range<boost::mpl::_1>,boost::mpl:: na>, 1> F2=boost::mpl::transform2<params,fixed_or_range<boost::mpl::_1>,boost::mpl:: na,boost::mpl::na> 1> ] 1> c:\users\hich\documents\visual studio 2008\projects\test\test1\main.cpp(51) : see reference to class template instantiation 'boost::mpl::transform<Seq1,Seq2OrOperation>' being compiled 1> with 1> [ 1> Seq1=params, 1> Seq2OrOperation=fixed_or_range<boost::mpl::_1> 1> ] Regards,

2 4

[Asio] io_service and queuing priority
by Dylan Klomparens 22 Dec '09

22 Dec '09

I have a program that uses an io_service to queue and execute function calls sequentially within its own thread. Other threads call io_service::post to queue small tasks, but every so often a large task is posted to the io_service. In my case, this large task is time-sensitive and must take priority over all other tasks. Is there a way to push that large task to the front of the io_service's queue, so I can guarantee it gets completed as soon as possible? A simpler way of asking my question: is it possible to prioritize an io_service queue? How? -- Dylan

2 1

[boost-graph]remove_vertex gives segmentation fault
by Suresh Kumar 22 Dec '09

22 Dec '09

Hi, I get segmentation fault when I call remove_vertex in boost graph. The graph is defined as adjacency_list<listS, listS, undirectedS, Cluster, Cluster> Graph; clear_vertex(leaf,g); remove_vertex(leaf,g); I call clear_vertex() and then remove_vertex(). remove_vertex gives a segmentation violation. How do I go about in debugging this? Thanks suresh -- R. Suresh Kumar PhD Student, Vislab #216, Engineering II Bldg University of California, Riverside, CA 92521

1 1

Re: [Boost-users] mpl/fusion: metafunction to 'rangify'
by Hicham Mouline 22 Dec '09

22 Dec '09

Prettified source code at http://codepad.org/knN4xmIR

1 0

BOOST_THROW_EXCEPTION old style cast
by Sam Miller 22 Dec '09

22 Dec '09

I am trying to build code using the BOOST_THROW_EXCEPTION macro with the gcc warning flags -Werror -Wold-style-cast. The macro appears to cast __LINE__ into an integer using an old-style cast instead of a static_cast. Any idea why? Sam

2 1

Compile error with boost_1_41
by Steve Ong 22 Dec '09

22 Dec '09

Hi, First of all, I don't know whether this is the right group to submit this particular issue; if not, please direct me to the right one... ...The issue: I just downloaded the source from the current Boost release (i.e., boost_1_41_0). I compiled this load into a static library and a dynamic libray (on both Solaris 10 and CYGWIN). After that I I try to compile the "basic_client" and "basic_server" (Source from the boost.asio project). Previously, these compiled just fine under boost_1_40_0, but now I running into the following compile errors: g++ -o chat_client chat_client.cpp -I/home/song/MyProjects/LibDist/boostS_1_41/include -L/home/song/MyProjects/LibDist/boostS_1_41/lib -lposix4 -lboost_thread -lboost_system -pthreads -lsocket In file included from /home/song/MyProjects/LibDist/boostS_1_41/include/boost/thread/future.hpp:12, from /home/song/MyProjects/LibDist/boostS_1_41/include/boost/thread.hpp:24, from chat_client.cpp:16: /home/song/MyProjects/LibDist/boostS_1_41/include/boost/exception_ptr.hpp:43: error: looser throw specifier for `virtual boost::exception_ptr::~exception_ptr()' /home/song/MyProjects/LibDist/boostS_1_41/include/boost/exception/detail/exception_ptr_base.hpp:27: error: overriding `virtual boost::exception_detail::exception_ptr_base::~exception_ptr_base() throw ()' make: *** [chat_client_] Error 1 ...Any advice to fix this would be appreciated. Steven

2 2

[typeof] Determining if a type has been registered or not at compile time
by Edward Diener 22 Dec '09

22 Dec '09

Is there any way one can determine whether a type has been registered or not with Boost.Typeof at compile time so that the information can be used in TMP ? I am thinking, of course, of the use of typeof in a template, where a template parameter may or may not be aregistered type when the template has been instantiated. I would like to provide my own TMP fallback code if the type has not been registered rather than see an immediate compiler error generated. Something like: boost::mpl::eval_if < boost::typeof::registered<T>, // this would be nice to have boost::mpl::identity<BOOST_TYPEOF_TPL(some_expression)>, boost::mpl::identity</* use another facility to get the type I want into a metafunction*/> >

2 2

Possibly Memory Leaks in Boost.Date_Time ?
by Daniel Vallejos 22 Dec '09

22 Dec '09

Hello! Memory Leaks in Boost.Date_Time ? Code: #include <boost/date_time.hpp> #include <iostream> using namespace boost::posix_time; using namespace std; int main() { time_duration interval = seconds(120); cout << "interval = " << interval << endl; } Valgrind profile: $ valgrind ./date_time_test ==8666== Memcheck, a memory error detector ==8666== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al. ==8666== Using Valgrind-3.5.0-Debian and LibVEX; rerun with -h for copyright info ==8666== Command: ./date_time_test ==8666== interval = 00:02:00 ==8666== ==8666== HEAP SUMMARY: ==8666== in use at exit: 1,595 bytes in 27 blocks ==8666== total heap usage: 48 allocs, 21 frees, 5,650 bytes allocated ==8666== ==8666== LEAK SUMMARY: ==8666== definitely lost: 0 bytes in 0 blocks ==8666== indirectly lost: 0 bytes in 0 blocks ==8666== possibly lost: 619 bytes in 20 blocks ==8666== still reachable: 976 bytes in 7 blocks ==8666== suppressed: 0 bytes in 0 blocks Environment: $ uname -a Linux electroforce 2.6.31-15-generic #50-Ubuntu SMP Tue Nov 10 14:53:52 UTC 2009 x86_64 GNU/Linux $ g++ --version g++ (Ubuntu 4.4.2-5ubuntu1) 4.4.2

1 0

Program executable won't run using boost 1.40
by Carles Fernandez 22 Dec '09

22 Dec '09

Hi everyone, I'm new to boost and I've followed the getting started guide from boost to set it up into my computer. The first example<http://www.boost.org/doc/libs/1_40_0/more/getting_started/windows.html#buil…>compiles and executes correctly. But the second one<http://www.boost.org/doc/libs/1_40_0/more/getting_started/windows.html#link…> fails to execute (but it does compile and link correctly). When I try to execute the program from a command line (like the tutorial indicates) I get the following error: *The system cannot execute the specified program.* * * And if i try to execute it directly from Visual Studio it says: *Unable to start program ...../..../example.exe* *This application has failed to start because the application configuration is incorrect. Review the manifest file for possible errors. Reinstalling the application may fix this problem. For more details, please see the application event log.* I am using Visual Studio 2005 and I have downloaded all the VC8.0 (visual studio 2005) boost 1.40 precompiled libraries using the boostpro installer. Can someone help me please? I'm sure I am doing something wrong, but I don't know what..

2 1

boost::serialization::null_deleter
by Andreas Ronnquist 22 Dec '09

22 Dec '09

Hi! I am using boost::serialization::detail::null_deleter in combination with shared_ptr (on boost 1.34/35) - and I am having a user of my program compiling my program (on boost 1.41) who says he has to change that line to just boost::serialization::null_deleter to get it to work. Should I work around this with pre-processor checks, and in that case - what versions should I look for? Or is there a simpler fix? thanks in advance -- Andreas Ronnquist <andreas.ronnquist(a)meritkonsult.se>

5 4

Re: [Boost-users] storing data
by pete＠pcbartlett.com 22 Dec '09

22 Dec '09

On Tue 22/12/09 05:08 , "Sean Farrow" <sean.farrow(a)seanfarrow.co.uk> wrote: > Hi: > > I am in need to store data. Basically I have an application, when I > have 8 collumns that are named, however thee are 38 possible rows with > differing nameson. I also need to store the screen co-ordinates for > each column name on each row. So for example: > > Column 1, name Item, row 1, x 66, y 85, row 2 x 88 y 121. > > What is the best way of being able to store this data with boost and > get access to the item name, and co-ordinates given a row and column > number? Hi Sean, There are several boost libraries that may be of help - I am thinking of boost.array, boost.multi_array and possibly even boost.multi_index. This is in addition to standard containers such as map and vector. However it is difficult to give very specific advice as I find your mail unclear. The best I can suggest is to think through your problem again, thinking how to make it easier for others to understand - in my experience the very process of thinking how to explain a problem clearly to others may help /you/ solve the problem by yourself. Your mail would also benefit from being passed through a spelling and grammar checker prior to posting. I hope this advice is of help to you, Pete Bartlett

1 0

[graph] How to find the number of adjacent nodes
by Suresh Kumar 22 Dec '09

22 Dec '09

Hi Is there any easy method to find out the number of adjacent nodes in a graph? I am using adjacency_list with listS as parameters. Hence I i am unable to subtract the vertex iterator values returned by adjacent_vertices. Thanks suresh -- R. Suresh Kumar PhD Student, Vislab #216, Engineering II Bldg University of California, Riverside,

2 1

How to use boost::asio to implement a synchronous operation with timeouts?
by watsonsong 22 Dec '09

22 Dec '09

In the boost official documents, the example of timeouts in asio is implements by asynchronous operations and a deadline_timer. But what I want is a synchronous operation with a timeout, but I search nearly all of the reference manual and find nothing about it. In an other words, how can I used the asynchronous operations to simulate synchronous operations with timeouts. Maybe I could launch an asynchronous operation and call io_service::run_one immediately, but I don't know whether it is safe when I call io_service::run_one in a complete callback function which is call by io_service::run? Or there is any classic solution of this question. Thank you. -- View this message in context: http://old.nabble.com/How-to-use-boost%3A%3Aasio-to-implement-a-synchronous… Sent from the Boost - Users mailing list archive at Nabble.com.

1 0

storing data
by Sean Farrow 22 Dec '09

22 Dec '09

Hi: I am in need to store data. Basically I have an application, when I have 8 collumns that are named, however thee are 38 possible rows with differing nameson. I also need to store the screen co-ordinates for each column name on each row. So for example: Column 1, name Item, row 1, x 66, y 85, row 2 x 88 y 121. What is the best way of being able to store this data with boost and get access to the item name, and co-ordinates given a row and column number? Any help appreciated. Cheers Sean./

1 0

Echo server demo
by Michael Fowler 22 Dec '09

22 Dec '09

Hello. I tried using the code provided here: http://www.boost.org/doc/libs/1_41_0/doc/html/boost_asio/example/echo/block… to echo text back to a client but i haven't been successful. It seems to hang at size_t length = sock->read_some(boost::asio::buffer(data), error); what is wrong? Thanks

2 2

[Serialization] shared_ptr to const object
by elizabeta petreska 21 Dec '09

21 Dec '09

Hello I am using boost 1.38.0 How to serialize shared_ptr member which points to const object. The following compiles, but is not working i.e the restored boost_shared_ptr does not point to anything. I tried to use const_pointer_cast to cast the const away. I suspect that this is the problematic part. I think the question here is , how should I cast away the const correctly for boost::shared_ptr<const T>? #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp> #include <boost/serialization/nvp.hpp> #include <boost/serialization/utility.hpp> #include <fstream> #include <boost/serialization/shared_ptr.hpp> class B { public: B() { } B(int a):ma(a) { } int ma; template<class Archive> void serialize(Archive & ar, const unsigned int version) { using boost::serialization::make_nvp; ar & make_nvp("ma",ma); } }; class BC { public: BC() { } BC(boost::shared_ptr<B>& t):mac(t) { } boost::shared_ptr<const B> mac; template<class Archive> void serialize(Archive & ar, const unsigned int version) { using boost::serialization::make_nvp; ar & make_nvp("mac", boost::const_pointer_cast<B> (mac)); } }; int main() { std::ofstream ofs(L"C:\\MyTest.xml"); std::ifstream ifs(L"C:\\MyTest.xml"); boost::shared_ptr<B> bb(new B(4)); BC aa(bb); { boost::archive::text_oarchive oa(ofs); oa & BOOST_SERIALIZATION_NVP(aa); } BC raa; { boost::archive::text_iarchive ia(ifs); ia & BOOST_SERIALIZATION_NVP(raa); } }

3 6

Bug using mpl with <ciso646> and MSVC?
by ebryan 21 Dec '09

21 Dec '09

Hello, I am using Spirit with some code that uses the keywords 'and', 'or', etc. MSVC (at least my version, 9.0) does not implement these keywords, but support can be added by including <ciso646>, which just has a bunch of macros, ie. "#define and &&". The problem I am running into is that when I try to compile something that uses Spirit and ciso646, I get this compiler error: boost\mpl\aux_\include_preprocessed.hpp(37) : fatal error C1083: Cannot open include file: 'boost/mpl/aux_/preprocessed/plain/&.hpp': No such file or directory The offending line in include_preprocessed.hpp is: # include BOOST_PP_STRINGIZE(boost/mpl/aux_/preprocessed/AUX778076_PREPROCESSED_HEADER) It looks like the macro 'bitand' is being expanded in here, so it tries to include '&.hpp'. Now, I think this problem has already been solved (mostly). See this archived discussion, where this problem was worked around for 'and' and 'or': http://lists.boost.org/Archives/boost/2004/05/65563.php I have checked the header files in boost/mpl and only see three more conflicts between header names and ciso646 macros: 'bitand', 'bitor', and 'not'. If someone with more expertise than myself could implement a similar workaround for these headers, I would be very grateful. Thanks, Erik -- View this message in context: http://old.nabble.com/Bug-using-mpl-with-%3Cciso646%3E-and-MSVC--tp26851153… Sent from the Boost - Users mailing list archive at Nabble.com.

1 1

Using Fusion adapted struct with mpl::is_sequence
by John Smith 21 Dec '09

21 Dec '09

Hi, I have adapted a struct to be a fusion sequence like so: struct s { uint8_t i; uint8_t j; uint8_t k; }; BOOST_FUSION_ADAPT_STRUCT( s, (uint8_t, i) (uint8_t, j) (uint8_t, k) ) which works fine. However, I pass the adapted struct to my MPL algorithm and it seems to always return false on mpl::is_sequence. If I typedef boost::fusion::fusion_sequence_tag tag in the struct, then it all works, also if I pass in a proper fusion sequence, then that works as well. I was wondering if there was a different way of doing things, I don't really want to require the tag to be typedef'ed in the structure. Thanks, Dave

4 5

Serialization of derived class in a plugin
by Jean-Charles Quillet 21 Dec '09

21 Dec '09

Hi, I've been using the boost serialization on many projects. But I can't manage to make it work on my current project. Basically, I've a main application and an abstract class located in a separate dll. The application loads dynamically plugins which defines classes derived from the abstract class. Then I'm trying to serialize a class created by a plugin using a pointer to the abstract class, I always get a "Unregistered class" exception. I've used the BOOST_CLASS_EXPORT macro in the plugins trying to make the boost serialization library aware of my classes without any success so far. Looking in the source directory and specially in the "test" directory, I've seen that what I'm trying to do is the same as the test described by the file test_dll_plugin.cpp, unfortunately, it seems the test is not compiled and I can't manage to make it link without error. So my main concern is: is this feature supposed to be working ? If not I'll have to review my design. If it does what is the magic to make it work (like how to compile test_dll_plugin.cpp or another simple working example) ? Thanks for any help, Jean-Charles

2 8

How can I create a ip::tcp::iostream from a SOCKET descriptor?
by Eric J. Holtman 21 Dec '09

21 Dec '09

I'm trying to convert my hand-rolled marshalling code into boost::serialization and boost::ip classes. My code gets handed a SOCKET handle (win XP). I have no control over this, the connection/server/client stuff is handled elsewhere, I just get the SOCKET after everything's already open. How can I create an iostream from that, so I can then use the Archive classes to send and receive objects over the socket? I understand the "harder" stuff (writing the overloads for my classes for input/output to a generic stream). I'm just stuck on finding that construction (or function) that will take an already opened SOCKET handle and wrap an iostream around it. any clues?

2 2

[serialization] "unregistered class" with 1.41, o.k. with 1.38
by Ruediger Berlich 21 Dec '09

21 Dec '09

Hi there, Consider a hierarchy of classes that is accessed through an abstract base class. The most derived class is a template which is "filled" with the basic types bool, char, boost::int32_t and double. I use typedefs of the kind "typedef GParameterT<char> GChar;" for ease of use. This is held in its own header file, in this case GChar.hpp . A corresponding GChar.cpp holds the export statement needed to register the class (or typedef in this case): #include <boost/serialization/export.hpp> BOOST_CLASS_EXPORT(Gem::GenEvA::GChar) There are also identical (except for base types) files for GDouble, GBoolean and GInt32 (holding the tell-tale typedefs and exports for the corresponding types). I'm using unit tests for my library, and there you will find code like: // Test (de-)serialization in different modes { // plain text format T gpt4(gpt0); BOOST_CHECK(gpt4.isEqualTo(gpt0)); BOOST_CHECK_NO_THROW(gpt4.fromString(gpt1.toString(TEXTSERIALIZATION), TEXTSERIALIZATION)); BOOST_CHECK(!gpt4.isEqualTo(gpt0)); BOOST_CHECK(gpt4.isSimilarTo(gpt1, exp(-10))); } // [ ... further serialization modes removed ... ] T can again be GChar, GBoolean, GDouble or GInt32 . to/fromString is a simple wrapper to the serialization calls (all happening through the base pointer). Now I have the problem that the toString/fromString throws an "unregistered class" with Boost 1.4.1, but **only** if GParameterT is fed a double or a boost::int32_t . (De-)Serialization works fine with char and bool as template parameter. With Boost 1.38, no errors occur at all, and also my production code works nicely with 1.41 (and it uses Boost.Serialization extensively). Any idea ? In any case: Thanks for a great library and have a nice christmas time and a happy new year! Best Regards, Ruediger

1 0

bimap find
by Bosko Markovic 21 Dec '09

21 Dec '09

Hi, I have one simple question for which I could not find answer in Bimap documentatio nor on the list. When searching bimap using find method what is the value of returned iterator if nothing matches search query? Example code: BimapDWORDVariant::right_map::const_iterator right_iter = bm.right.find(sSyncMsg); Thank you. BoskoM.

2 2

[boost::interprocess] Do I need to use lock before allocate shared memory?
by blp330 21 Dec '09

21 Dec '09

Hi, Do I need to use lock before allocate shared memory? I have two processes that will allocate string to the same shared memory, do I need to use lock? Thanks. -- View this message in context: http://old.nabble.com/-boost%3A%3Ainterprocess--Do-I-need-to-use-lock-befor… Sent from the Boost - Users mailing list archive at Nabble.com.

2 1

boost::iostreams
by Anand Patel 20 Dec '09

20 Dec '09

I have implemented iostream::filter and would like to set the stream(source/sink) error flags in the event of unexpected conditions. I did not find anyway to set the flags. Can someone please help. -Anand

1 0

asio: sys/epoll.h
by Pascal Kesseli 20 Dec '09

20 Dec '09

Hi everyone Trying to cross-compile my embedded code to a new platform, I hit the following error message: ... /home/beo/Software/C++/UC-8410/boost/include/boost-1_39/boost/asio/detail/epoll_reactor.hpp:27:23: warning: sys/epoll.h: No such file or directory ... My cross toolchain obviously does not feature such a file. Any way to circumvent or solve this issue? These are my compiler specs: g++ (GCC) 4.2.1 Copyright (C) 2007 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. It's the UC-8410 MOXA toolchain. Thanks in advance for any help and best regards Pascal _________________________________________________________________ Ski-Weltcup: Alle Rennen, alle Resultate und News auf MSN Sport http://sport.ch.msn.com/skialpin/

2 1

undefined reference to `boost::thread_resource_error::thread_resource_error()'
by Stefano 20 Dec '09

20 Dec '09

Hello, On ubuntu, I have a piece of software linking against the boost thread library. Linking with boost version 1.40 I don't have any problem, whereas switching to 1.41 I got the undefined reference to `boost::thread_resource_error::thread_resource_error()' In the sources I see that this constructor is now inlined and if I do nm -C -D libboost_thread.so | grep thread_resource_error from this (1.40) 0000ee80 T boost::thread_resource_error::thread_resource_error(int) 0000ee00 T boost::thread_resource_error::thread_resource_error() 0000ee40 T boost::thread_resource_error::thread_resource_error(int) 0000edc0 T boost::thread_resource_error::thread_resource_error() 0000f4c0 T boost::thread_resource_error::~thread_resource_error() 0000f500 T boost::thread_resource_error::~thread_resource_error() 0000f530 T boost::thread_resource_error::~thread_resource_error() 0000eec0 T boost::thread_resource_error::what() const 00013e00 V typeinfo for boost::thread_resource_error 0000ffc0 V typeinfo name for boost::thread_resource_error 00013d98 V vtable for boost::thread_resource_error I got this (1.41) 0000b6e0 W boost::thread_resource_error::~thread_resource_error() 0000b720 W boost::thread_resource_error::~thread_resource_error() 0000b480 W boost::thread_resource_error::what() const 0001282c V typeinfo for boost::thread_resource_error 0000ed00 V typeinfo name for boost::thread_resource_error 00012848 V vtable for boost::thread_resource_error The symbol is weak now. I should be not a problem, right? But I got the unresolved ref What is the best option to have my stuff compiled without the unresolved refs? Thanks Stefano

4 4

[iostreams] writing to filtering_ostream
by Igor R 20 Dec '09

20 Dec '09

Hello, I've got an application that originally used IOStreams of Boost 1.34. Now I recompiled it with 1.41, and everything stopped functioning. Meanwhile, I figured out that one of the failures occurs due to the following line: iostreams::copy(istream(&someStreambuf), someFilteringStream); The intention was just to copy a chunk of binary data from an input stream to a filtering stream, but it turns out that iostreams::copy() now *closes* the sink. I tried to re-write it like this: someFilteringStream->write(sourceData, sourceSize); or this: iostreams::write(someFilteringStream, sourceData, sourceSize); But neither of the above executes the filter. So what's the right way to do this in 1.41? Thanks.

1 1

[boost::variant] problem with swap
by Ondrej Kuncar 20 Dec '09

20 Dec '09

Hello! I have problems to compile this code with Visual Studio 9.0 SP1 and Boost 1.41: ------------------------------------------------------------------- #include <boost/variant.hpp> #include <deque> typedef boost::variant<std::deque<int>::iterator> SemanticValue; int main() { SemanticValue v1; SemanticValue v2; v1.swap(v2); } ------------------------------------------------------------------- I got this error: c:\program files\boost\boost_1_41_0\boost\variant\detail\move.hpp(155) : error C2668: 'std::swap' : ambiguous call to overloaded function c:\program files\boost\boost_1_41_0\boost\variant\detail\move.hpp(141): could be 'void boost::detail::variant::detail::move_swap::swap<T>(T &,T &)' with [ T=T0 ] c:\program files\microsoft visual studio 9.0\vc\include\utility(16): or 'void std::swap<T>(_Ty &,_Ty &)' [found using argument-dependent lookup] with [ T=T0, _Ty=T0 ] while trying to match the argument list '(T0, T0)' c:\program files\boost\boost_1_41_0\boost\variant\variant.hpp(698) : see reference to function template instantiation 'void boost::detail::variant::move_swap<T>(T &,T &)' being compiled with [ T=T0 ] c:\program files\boost\boost_1_41_0\boost\variant\variant.hpp(825) : see reference to function template instantiation 'void boost::detail::variant::swap_with<Variant>::operator ()<T>(T &) const' being compiled with [ Variant=boost::variant<std::_Deque_iterator<int,std::allocator<int>,true>>, T=T0 ] c:\program files\boost\boost_1_41_0\boost\variant\detail\visitation_impl.hpp(141) : see reference to function template instantiation 'void boost::detail::variant::invoke_visitor<Visitor>::internal_visit<T>(T &,int)' being compiled with [ Visitor=boost::detail::variant::swap_with<boost::variant<std::_Deque_iterator<int,std::allocator<int>,true>>>, T=T0 ] c:\program files\boost\boost_1_41_0\boost\variant\detail\visitation_impl.hpp(169) : see reference to function template instantiation 'void boost::detail::variant::visitation_impl_invoke_impl<Visitor,VoidPtrCV,T>(int,Visitor &,VoidPtrCV,T *,boost::mpl::false_)' being compiled with [ Visitor=boost::detail::variant::invoke_visitor<boost::detail::variant::swap_with<boost::variant<std::_Deque_iterator<int,std::allocator<int>,true>>>>, VoidPtrCV=void *, T=T0 ] c:\program files\boost\boost_1_41_0\boost\variant\detail\visitation_impl.hpp(252) : see reference to function template instantiation 'void boost::detail::variant::visitation_impl_invoke<Visitor,VoidPtrCV,T0,NoBackupFlag>(int,Visitor &,VoidPtrCV,T *,NoBackupFlag,int)' being compiled with [ Visitor=boost::detail::variant::invoke_visitor<boost::detail::variant::swap_with<boost::variant<std::_Deque_iterator<int,std::allocator<int>,true>>>>, VoidPtrCV=void *, NoBackupFlag=boost::variant<std::_Deque_iterator<int,std::allocator<int>,true>>::has_fallback_type_, T=T0 ] c:\program files\boost\boost_1_41_0\boost\variant\variant.hpp(1769) : see reference to function template instantiation 'void boost::detail::variant::visitation_impl<first_which,first_step,Visitor,VoidPtrCV,boost::variant<T0_>::has_fallback_type_>(const int,const int,Visitor &,VoidPtrCV,boost::mpl::false_,NoBackupFlag,Which *,step0 *)' being compiled with [ Visitor=boost::detail::variant::invoke_visitor<boost::detail::variant::swap_with<boost::variant<std::_Deque_iterator<int,std::allocator<int>,true>>>>, VoidPtrCV=void *, T0_=std::_Deque_iterator<int,std::allocator<int>,true>, NoBackupFlag=boost::variant<std::_Deque_iterator<int,std::allocator<int>,true>>::has_fallback_type_, Which=first_which, step0=first_step ] c:\program files\boost\boost_1_41_0\boost\variant\variant.hpp(1780) : see reference to function template instantiation 'void boost::variant<T0_>::internal_apply_visitor_impl<Visitor,void*>(int,int,Visitor &,VoidPtrCV)' being compiled with [ T0_=std::_Deque_iterator<int,std::allocator<int>,true>, Visitor=boost::detail::variant::invoke_visitor<boost::detail::variant::swap_with<boost::variant<std::_Deque_iterator<int,std::allocator<int>,true>>>>, VoidPtrCV=void * ] c:\program files\boost\boost_1_41_0\boost\variant\variant.hpp(1803) : see reference to function template instantiation 'void boost::variant<T0_>::internal_apply_visitor<boost::detail::variant::invoke_visitor<Visitor>>(boost::detail::variant::invoke_visitor<Visitor> &)' being compiled with [ T0_=std::_Deque_iterator<int,std::allocator<int>,true>, Visitor=boost::detail::variant::swap_with<boost::variant<std::_Deque_iterator<int,std::allocator<int>,true>>> ] c:\program files\boost\boost_1_41_0\boost\variant\variant.hpp(1637) : see reference to function template instantiation 'void boost::variant<T0_>::apply_visitor<boost::detail::variant::swap_with<Variant>>(Visitor &)' being compiled with [ T0_=std::_Deque_iterator<int,std::allocator<int>,true>, Variant=boost::variant<std::_Deque_iterator<int,std::allocator<int>,true>>, Visitor=boost::detail::variant::swap_with<boost::variant<std::_Deque_iterator<int,std::allocator<int>,true>>> ] c:\program files\boost\boost_1_41_0\boost\variant\variant.hpp(1631) : while compiling class template member function 'void boost::variant<T0_>::swap(boost::variant<T0_> &)' with [ T0_=std::_Deque_iterator<int,std::allocator<int>,true> ] d:\dokumenty\visual studio 2008\projects\pokus4\pokus4\pokus4.cpp(20) : see reference to class template instantiation 'boost::variant<T0_>' being compiled with [ T0_=std::_Deque_iterator<int,std::allocator<int>,true> ] Do you have any ideas? Thanks. OK

2 2

VxWorks support in boost 1.41
by Geoff Shapiro 19 Dec '09

19 Dec '09

Having recently upgraded to just released 1.41 version of boost, I noticed the new support for the VxWorks platform. I am now in the process of porting over a body of code using boost to a VxWorks/PPC platform and obviously want to take advantage of the builtin support, but I've run into a problem and would like advice on the "boost" way of rectifying the problem. I am using VxWorks 6.7 to be running on an MPC8548 PPC. When I try to compile my project files in the standard manner for incorporating boost with tr1 support (.../boost/boost/tr1/tr1 and .../boost first in the header search paths, #include <memory> as first thing in files), I am getting a compile warning. The complaint is for already defined preprocessor macros -- in boost/config/vxworks.hpp at lines 23 and 24 there are definitions: #define _POSIX_TIMERS 1 #define _POSIX_THREADS 1 A little further down, this header file includes boilerplate code in boost/config/posix_features.hpp and that header file then includes unistd.h, a system file. For VxWorks 6.7, unistd.h also has defines for the above preprocessor macros, but sets their values to 200112L. While the warning may be able to ignored and is probably benign, IF unistd.h is always included after vxworks.hpp (I am not sure this will be the case for all of our files), I would rather see this fixed. What would be the best way to fix this so as to remain conformant with the "boost" philosophy for platform independence?

2 2

metafunction to 'rangify'
by Hicham Mouline 19 Dec '09

19 Dec '09

Hi, struct inputs { double input1; int input2; bool input3; }; Given type 'inputs', how to I write a metafunction that can return to me this type: rangify<inputs>::type identical to struct inputs_rangified { union { double fixed; boost::tuple<double, double, double> range; } input1; // range is min, max, increment union { int fixed; boost::tuple <int, int, int> range; } input2; union { bool fixed; std::pair<bool, bool> range; } input3; std::bitset<3> is_range; }; 1. Is it possible to get the number of members of a struct at compile-time? 2. What would be the easiest way to fill inputs_rangified from an input stream? Typically, my application will have hundreds different 'inputs' types and I would like to automate this process. Regards,

3 3

[mpl][type_traits] Getting the minimum and maximum value for a buit-in type at compile time
by Edward Diener 19 Dec '09

19 Dec '09

I would have thought that there must be a way to get the minimum and maximum value for a C++ built-in type but my search through mpl and type_traits yields nothing and numeric_limits requires a run-time function call. Surely this information is available to the compiler so it must be available to the TMP programmer somewhere. Where is it ?

3 4

[mpl] Strange integral constant overflow warning in mpl::less_equal
by Edward Diener 19 Dec '09

19 Dec '09

This simplified version of some TMP code I am writing using mpl and integer_traits is giving me a strange warning. I'm using VC9 and Boost 1.40: ------------------------------------------------------------------------------------- struct ResultTypeIntegerValues { typedef boost::mpl::long_<0L> lzero; typedef boost::mpl::long_<boost::integer_traits<long>::const_min> lmin; typedef boost::mpl::less_equal<lmin,lzero>::type type; }; ------------------------------------------------------------------------------------- with warning message: ------------------------------------------------------------------------------------- c:\utilities\boost\boost_1_40_0\boost\mpl\aux_\integral_wrapper.hpp(73) : warning C4307: '-' : integral constant overflow 1> c:\utilities\boost\boost_1_40_0\boost\mpl\aux_\preprocessed\plain\less_equal.hpp(60) : see reference to class template instantiation 'boost::mpl::long_<N>' being compiled 1> with 1> [ 1> N=-2147483648 1> ] 1> c:\utilities\boost\boost_1_40_0\boost\mpl\aux_\preprocessed\plain\less_equal.hpp(70) : see reference to class template instantiation 'boost::mpl::less_equal_tag<T>' being compiled 1> with 1> [ 1> T=nmspace::ResultTypeIntegerValues::lmin 1> ] 1> c:\programming\programs\xxx\yyy.h(64) : see reference to class template instantiation 'boost::mpl::less_equal<N1,N2>' being compiled 1> with 1> [ 1> N1=nmspace::ResultTypeIntegerValues::lmin, 1> N2=nmspace::ResultTypeIntegerValues::lzero 1> ] ------------------------------------------------------------------------------------- As far as I can see I am doing a perfectly valid comparison. Is this a minor bug in mpl or am I doing something wrong or should this warning just be expected ? Warning C4307 gives: ------------------------------------------------------------------------------------- Error Message 'operator' : integral constant overflow The operator is used in an expression that results in an integer constant overflowing the space allocated for it. You may need to use a larger type for the constant. A signed int holds a smaller value than an unsigned int because the signed int uses one bit to represent the sign. The following sample generates C4307: // C4307.cpp // compile with: /W2 int i = 2000000000 + 2000000000; // C4307 int j = (unsigned)2000000000 + 2000000000; // OK int main() { } -------------------------------------------------------------------------------------

2 2

Re: [Boost-users] [Boost.Test] valgrind complains about invalid reads
by Scott Banachowski 18 Dec '09

18 Dec '09

--- Steven Watanabe wrote: > joel falcou wrote: > > I'm jumping in the wagon but this very piece of code > leads to a > > "incorrect free" on Snow Leopard using g++ 4.2.1 > Apple. > > Maybe it is related to the virtual matter > > We've already discussed this many times. The code above > is wrong for reasons unrelated to the use of a virtual > destructor, > although adding a virtual destructor masks the problem. > This has been fixed in the trunk. Thanks Steven, with some searching I think I found the patch you are referring to: https://svn.boost.org/trac/boost/changeset/56467 Seeing this patch, I now see how the virtual function is a red herring (although I don't know why it happens to work, in this case). Nevertheless, I still like the idea of making it virtual, just to avoid the necessity of switching on type and casting to delete, but that's my opinion. Scott

1 0

sizeof of boost::int8_t
by eial＠cs.bgu.ac.il 18 Dec '09

18 Dec '09

running sizeof on a boost::int8_t returns 1, but what is the type? int/char? thanks.

8 7

[containers] defining the insertion point of non-unique keys
by Olaf Krzikalla 18 Dec '09

18 Dec '09

Hi @boost, I'm looking for the solution to the following problem: there is a collection of objects and I want to find a particular object by two different keys. The first key is unique, so there is no problem. The second key however is non-unique and if I search for an object using this key I want to find the element that was inserted last in that sequence. Neither boost::multindex nor boost:intrusive seems to have solutions right at hand. If using boost::multindex I could try to insert a new element in the non-unique sequence using the lower_bound iterator of that sequence as a hint. However it is not documented that in that case the element is always inserted before the hint. Same is true for boost:intrusive::multi_set/multi_map. And I'm not able to swap the position of two adjacent elements in a multi_set or multi_map, if they have equal keys. To illustrate the problem, here is some code: struct A { int a; // non-unique key void* b; // unique key // stuff }; using namespace boost::multi_index; typedef multi_index_container<A, indexed_by< ordered_non_unique<member<A,int,&A::a> >, ordered_unique<member<A,void*,&A::b> > > > tCollection; void foo(tCollection& collection, int key) { typedef tCollection::nth_index<0>::type tItByInt; tItByInt i = collection.get<0>().lower_bound(key); // use the current lower bound as a hint: tItByInt insertPos = collection.get<0>.insert(i, getObject(key)); // the big question: does the assertion holds? assert(collection.get<0>().lower_bound(key) == insertPos); } Best regards Olaf Krzikalla

4 9

Re: [Boost-users] Boost Graph and GraphViz - Names and Subgraphs
by Graham Hemingway 18 Dec '09

18 Dec '09

I am building graphs with boost::graph and want to generate GraphViz output. Most everything works as expected, but I am having trouble getting two things to work correctly: 1) My subgraphs are not visualized in the GraphViz output 2) I am setting the graph_name property of both the root graph and all subgraphs, but the names never appear in the GraphViz output. Any help would be appreciated. Cheers, Graham

1 0

[phoenix] Staus of phoenix
by Edward Diener 18 Dec '09

18 Dec '09

Is phoenix an official Boost library ? I do not see it listed among the Boost libraries for 1.40 or 1.41 although I do see it in the pdf documentation for Boost libraries put together by John Maddock.

6 11

Template type questions
by Glenn Macgregor 18 Dec '09

18 Dec '09

Hi All, I am using the boost::variant with the binary visitor algorithm, apply_visitor. struct UnknownValue {}; typedef boost::variant<UnknownValue, long, unsigned long, double, string, char> ValueType; I am using apply_visitor for binary visitation as below: class AddVisitor : public boost::static_visitor<> { public: template <typename T> void operator()(const T &lhs, const T &rhs) { T val = lhs + rhs; } template <typename T, typename R> void operator()(const T &lhs, const R &rhs) { // do nothing...different types } template <typename T> void operator()(const T &lhs, const UnknownValue &rhs) { // do nothing...we have an unknown value } template <typename T> void operator()(const UnknownValue &lhs, const T &rhs) { // do nothing...we have an unknown value } void operator()(const UnknownValue &lhs, const UnknownValue &rhs) { // do nothing...we have an unknown value } }; The above is not complete because I can do addition if the types are long and unsigned long or long and double or long and char...etc. What is the preferred method for doing this? Do I need to create an overridden operator() for every argument combination that is valid or can I get the argument types in the function? Thanks Glenn

2 1

[spirit] help parsing data file into a struct
by Kenny Riddile 18 Dec '09

18 Dec '09

This is my first time using Spirit and I haven't messed with writing EBNF grammars since college, so I'm sorry if this is a simple question. Lets say I have a structure that looks like this: struct Foo { std::string someString; std::string someOtherString; std::vector<std::string> stringList; }; BOOST_FUSION_ADAPT_STRUCT( Foo, (std::string, someString) (std::string, someOtherString) (std::vector<std::string>, stringList) ) and I have a data file that looks like this: SOMESTRING hello SOMEOTHERSTRING goodbye STRINGLIST { string1 string2 string3 } I have written the following grammar to parse such a file into the struct above: template< typename Iterator > struct FooDefinition : spirit::qi::grammar< Iterator, Foo() > { FooDefinition() : FooDefinition::base_type( start ) { using namespace spirit::qi; start = someString >> +space >> someOtherString >> +space >> stringList; someString = lit("SOMESTRING") >> +space >> value; someOtherString = lit("SOMEOTHERSTRING") >> +space >> value; stringList = lit("STRINGLIST") >> *space >> lit('{') >> *space >> (value % +space) >> *space >> lit('}'); value = +char_("a-zA-Z_0-9"); space = lit(' ') | lit('\n') | lit('\t'); } spirit::qi::rule< Iterator, Foo() > start; spirit::qi::rule< Iterator, std::string() > someString; spirit::qi::rule< Iterator, std::string() > someOtherString; spirit::qi::rule< Iterator, std::vector<std::string>() > stringList; spirit::qi::rule< Iterator, std::string() > value; spirit::qi::rule< Iterator > space; }; However, I would like the order of the three statements in the data file (SOMESTRING, SOMEOTHERSTRING, and STRINGLIST) to be irrelevant. Right now, they must be in the order shown above for parsing to succeed. How would I go about accomplishing this with Spirit?

2 2

inheritance, input streams, parsing and arithmetic range of values
by Hicham Mouline 18 Dec '09

18 Dec '09

Hello I would like your opinions about design/implementation choices for an application I am writing. I have a list of models. Each model is a kind of black box that takes inputs and produces outputs. All the inputs are either of boolean or arithmetic type. (bool, int, double) A subset of inputs is valid for all models. Then different models have different number of other inputs. For a fixed set of inputs, the model produces 1 fixed set of outputs. It is desired to vary the values of some/all (at least 1) of the inputs and get different outputs sets, and then plot that. The inputs are specified in files (considered as std::istream in the code), the syntax is trivial: input1 = value1 ... inputn = valuen When it is desired to vary the input values, the syntax changes a little: input1 = value1 input2 = value21..value22 ... inputn = valuen in this example only input2 changes, and the idea is to plot one of the outputs over the differnt values of input2. Each derived model has a concrete struct input_i_s { ... } that holds its inputs. class model { public: virtual fixed_inputs get_fixed_inputs( std::istream& ) const =0; /// throws if syntax error, or not all inputs are specified, or some values are not valid virtual variable_inputs get_variable_inputs( std::istream& ) const =0; /// the same, allows the '..' notation though for ranges, at least of the inputs need to be a range }; // fixed_inputs is a pointer to a base class of all inputs for all models 1 implementation pseud-code looks like: fixed_inputs model_i::get_fixed_inputs( std::istream& input) const { size_t inputs = 7; std::string buffer; while (inputs>0 && input.good()) { input >> buffer; if ( buffer.substr(0, sizeof("input1")) == "input1=") { std::istringstream is(buffer.substr(0, sizeof("input1"))); is >> .... ; /// pseudo-code : stores the value into a field in fixed_input1s // if wrong value, throws an exception } else if ... ... } return fixed_inputs( new input_i_s() ); // pseudo-code, say for model number i } I would like then to write the implementation for the syntax which accepts ranges as well. (the get_variable_inputs function) I hope to be able to factorize code between the 2 implementations. 1. boost::program_options can read options from input streams. Given that I am interested in ranges as well, is it adviced to go down that road? 2. Is there a library that helps to generate the expected format of the input stream from the struct of inputs for each model, and reads the stream automatically. Can it do range values as well? 3. is it possible then to factorize code between the get_fixed_inputs and get_variable_inputs? Regards,

1 0

(no subject)
by Michael Fowler 18 Dec '09

18 Dec '09

Hello. I tried using the code provided here: http://www.boost.org/doc/libs/1_41_0/doc/html/boost_asio/example/echo/block… to echo text back to a client but i haven't been successful. It seems to hang at size_t length = sock->read_some(boost::asio::buffer(data), error); what is wrong? Thanks

1 0

Function template specialization
by Surya Kiran Gullapalli 18 Dec '09

18 Dec '09

Hello all, The following question may not be related to boost, but if a solution can be found with boost or otherwise would be great. I've a base class with a function template. I derive from base class and try to have a specialization for the function template in derived class I did something like this. ////////////////////////// Header file begin ////////////////////////// class Base { .. template <typename T> fun (T arg) { ... } }; class Derived : public Base { ... } ; template <> Derived::fun(int arg); ///////////////////////// Header file end //////////////////////////// and in .cpp file I've provided implementation for the template specialization. This works fine with MSVC 8.0 and g++ complains about lack of function declaration fun in Derived class. I do not know which compiler is behaving correctly. Any help in this is greatly appreciated. Thanks in advance, Surya

2 1

boost lambda and bind
by Conoscenza Silente 18 Dec '09

18 Dec '09

Hi All I am trying to use boost lambda for looping over a std::map to get each element and pass those to a class function using lambda functions. I don't know why but the binding inside my std::for_each is not compiling and I have 2 errors pointing to the line where boost::assign is used. 'invalid initialization of reference of type int&' 'invalid initialization of reference of type std::basic_string<>&' Do you know how to fix this and why it is happening Thank you very much Regards CS //Boost //#include<boost/assign/std/map.hpp> #include<boost/assign/list_of.hpp> #include<boost/lambda/lambda.hpp> #include<boost/lambda/core.hpp> #include<boost/lambda/bind.hpp> #include<boost/lambda/construct.hpp> class CInnerClassHandler{ public: void DoSomething( int aIntValue, const std::string& aStringValue ){ std::cout << "INT:" << aIntValue << "STRING:" << aStringValue << std::endl; // here we just trace } }; void map_lambda_test(){ typedef std::pair< int, std::string > this_pair; std::map< int, std::string > dictionary = boost::assign::map_list_of(3,"A")(4,"B")(5,"C"); // Errors points to // this line of code CInnerClassHandler obj; std::for_each( dictionary.begin(), dictionary.end(), boost::lambda::bind( &CInnerClassHandler::DoSomething, &obj, boost::lambda::bind(&this_pair::first, boost::lambda::_1), boost::lambda::bind(&this_pair::second,boost::lambda::_1)) ); }

2 2

Build boost for i686 (instead of i386)
by Christoph Duelli 18 Dec '09

18 Dec '09

What do I have to pass to bjam to build Boost with i686 instead of the default i386 as cpu? (I am using Linux, with gcc 4.3.2) So far I am calling ./bjam architecture=x86 address-model=32 Best regards Christoph

2 1

Re: [Boost-users] [Boost.Test] valgrind complains about invalid reads
by Scott Banachowski 18 Dec '09

18 Dec '09

Thanks for the reply Gennadiy, see inline for comments: --- On Wed, 12/16/09, Gennadiy Rozental <rogeeff(a)gmail.com> wrote: > From: Gennadiy Rozental <rogeeff(a)gmail.com> > Subject: Re: [Boost-users] [Boost.Test] valgrind complains about invalid reads > To: boost-users(a)lists.boost.org > Date: Wednesday, December 16, 2009, 9:32 PM > Scott Banachowski <sbanacho > <at> yahoo.com> writes: > > > > > > > I agree with Peter here, the destructor for test_unit > should be virtual. > > 'Should' is a strong statement. Do you have anything to > based it on? > Ok, should is too strong. Change that to "it would be nice to", because the possibility that the base class destructor may be called (even if not by your code, possibly by others). > > I find that it is being deleted when > > test_unit* is a stored in reference counted pointer, > > Where? My mistake, it's held in a map. See the next comment: > > > and at program exit it is being deleted by calling > ~test_unit(). > > Where do I call destructor explicitly? You don't. It's being called implicitly at program exit, by valgrind. I think what is happening is that valgrind replaces the delete operator with its own, which is "operator delete(void*)" The typeinfo is likely lost by this replacement of delete. Just because you don't call the destructor, it doesn't mean others won't. If a base class is derived from, best practice is to declare its destructor virtual. It is relatively common to replace allocators (e.g. tcmalloc). > > > If you use a derived class (test_suite), this is > leading to an error. > > Where? As already mentioned, reported by valgrind. > > > Also, in the code I'm looking at (1.40.0), the > test_suite class has a > > virtual destructor, but its base class test_unit > does not. > > Not making the base class virtual seems to be > defeating the purpose. > > What purpose? The only reason that test_suite destructor is > virtual is because > this class in fact is being polymorphically. It has > subclass master_test_suite. > By defeating the purpose, I mean it forces code like the following: if( ut_detail::test_id_2_unit_type( tu.second->p_id ) == tut_suite ) delete static_cast<test_suite const*>(tu.second); else delete static_cast<test_case const*>(tu.second); A virtual base case simplifies this code (especially if in the future other classes are added, or in the case of replacement allocator it does the right thing). thanks, Scott > Gennadiy > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

4 3

[serialization] object tracking for shared strings
by Nils Krumnack 17 Dec '09

17 Dec '09

Hi all, I hope one of you will be able to help me with this: I am working with a data structure that contains a large number of (mostly identical) strings. To save memory I put together a shared memory string implementation, which ensures that each string is kept in memory only once (implemented through a global map with all strings). However, once I write them to disk, I again have n copies of each string. I would really prefer, if I could avoid the space overhead. At first glance, object tracking seems to be the way to go. If my strings were tracked, there would automatically be only one copy of each string. However I can't quite figure out how. I don't really want to change the global tracking behavior for std::string, since that might end up affecting code all over the place. Serializing pointers would be an option, but then I would have to deal with the issue of when to deallocate that object. I suppose I could serialize shared pointers, but then I would have to change my implementation to use shared pointers internally. Alternatively I could also wrap a struct around the strings internally and turn on tracking for that struct, but again I would have to complicate my implementation for the sake of serialization. What I was hoping to find was some way of telling the archive at the point where I am serializing the object, that it should track this one object. I am thinking of something like ar & BOOST_SERIALIZATION_TRACK_THIS (mystring); I was looking for something like that in the documentation, but wasn't very successful. Any ideas? Thanks in advance for any help, Nils

3 7

are boost::interprocess containers thread-safe?
by blp330 17 Dec '09

17 Dec '09

Hi, I must implement a multiple producer-consumer IPC application in win32 (but will port to linux in near future). I am wondering whether the boost::interprocess container like list, vector or map is thread-safe (actually, interprocess-safe?) or I need to use lock in my producer-consumer application? I mean, can Producer just simply put shared memory string to container and take it from Consumer without any lock? Or is there any multiple producer-consumer example that uses boost::interprocess? Thanks a lot. -- View this message in context: http://old.nabble.com/are-boost%3A%3Ainterprocess-containers-thread-safe--t… Sent from the Boost - Users mailing list archive at Nabble.com.

2 3

[proto] extends example not compiling
by alfC 17 Dec '09

17 Dec '09

Is this example, contained in the boost.Proto manual supposed to compile? #include<complex> #include <boost/proto/core.hpp> #include <boost/proto/context.hpp> #include <boost/proto/debug.hpp> #include<boost/proto/extends.hpp> template<class T, class Dummy = boost::proto::is_proto_expr> struct my_complex { BOOST_PROTO_EXTENDS( typename boost::proto::terminal<std::complex<T> >::type , my_complex<T> , boost::proto::default_domain ) }; int main() { my_complex<int> c0, c1; c0 + c1; // OK, operator+ found now! } I get this error (with gcc 4.3 and gcc 4.4): proto_complex.cpp:10: error: expected nested-name-specifier before ‘typename’ proto_complex.cpp:10: error: two or more data types in declaration of ‘proto_base_expr’ proto_complex.cpp:10: error: ‘proto_base_expr’ has not been declared proto_complex.cpp:10: error: ‘proto_base_expr’ has not been declared The strangest thing is that when I replace the macro by its explicit code the code seems to compile. Thank you, Alfredo

2 5

[Re: ] boost.plot: integrating plotting in a C++ native application: general questions about which tools to use
by Richard Ulrich 17 Dec '09

17 Dec '09

Hi Hicham, another possibility is to use a webapp like Wt from http://webtoolkit.eu It's great to work with and has good support for 2D plots. As for the 3D: I've been thinking about that as well for a whild especially embedded in an interactive webpage. I came across openVRML which looks promising, but is a hell of a beast to build (the supporting libraries). So no experiences yet. Rgds Richard

3 2

newbie - graph library - vertex properties
by List User 17 Dec '09

17 Dec '09

Hi 1. In the creation of adjacency list, vertex properties and edge properties could be vecS, listS etc.But how will one access this vertex_properties vector, for example? 2. In the kevin-bacon2.cpp example file available with boost distribution, a struct is used to store vertex properties. But that example does not seem to have used boost_install_property or property_map etc. I thought one would need to use them for having new properties for the vertex. 3. In the kevin-bacon2.cpp approach for adding new properties to the graph, the vertex_properties are read as adjacency_list[vertex_descriptior]. How will have a read only access in such a case? When I use this in a function which is defined as const in c++, the compiler cribs :)Thanks suresh

5 15

[asio] Socket closed notification?
by Nicola Michael Gutberlet 17 Dec '09

17 Dec '09

Hello everybody, I'm using TCP sockets and wonder, if there's a possibility to get an automatic notification when one side of a socket is closed (even if the other side is crashed / not closed properly). Thanks in advance for any help. Regards, Nicola

4 14

Re: [Boost-users] [Boost.Test] valgrind complains about invalid reads
by Scott Banachowski 17 Dec '09

17 Dec '09

I agree with Peter here, the destructor for test_unit should be virtual. I find that it is being deleted when test_unit* is a stored in reference counted pointer, and at program exit it is being deleted by calling ~test_unit(). If you use a derived class (test_suite), this is leading to an error. Also, in the code I'm looking at (1.40.0), the test_suite class has a virtual destructor, but its base class test_unit does not. Not making the base class virtual seems to be defeating the purpose. Scott

2 1

Interfaces in C++
by Jerry Jeremiah 16 Dec '09

16 Dec '09

Hello, I am really interested in interfaces ever since Google's new Go language brought them to my attention. Who would have guessed they are a really old thing? Joel posted some code based on fusion that does interfaces at http://lists.boost.org/Archives/boost/2005/06/89418.php but it is based on a version of fusion before it became a separate library. I have fiddled with it trying to get it to compile against the trunk but I guess I just don't understand enough about fusion to get it going. :-( If Joel or some other fusion guru could tell me how to change it to get it to compile with the current version of fusion I would really appreciate it. Besides getting the ability to play with interfaces hopefully I will gain more in depth knowledge of how to use fusion... Jerry

1 0

boost graph library, default_dfs_visitor, dfs
by List User 16 Dec '09

16 Dec '09

Hi Please see the code below. class my_visitor: public default_dfs_visitor { public: my_visitor(){} void finish_vertex(Vertex u, const Graph & g); vector<Vertex> getFinishingOrder(void){return finishingOrder;} //private: vector<Vertex> finishingOrder;//stores the vertices in the finishing order }; template<typename Vertex, typename Graph> void my_visitor::finish_vertex(Vertex u, const Graph & g){ finishingOrder.push_back(u); } main.cpp has the following: my_visitor vis; depth_first_search(g, visitor(vis));//to get the finishing order on vertices cout << "size of fin vector = " << vis.finishingOrder.size() << endl; My problem: size of the finishingOrder vector is zero outside the my_visitor::finish_vertex method. I checked its size inside the my_visitor::finish_vertex method and its value is increasing... Does I miss something in the understanding of the visitor concept? Thanks suresh

4 3

[GIL] Change layout type of a pixel...
by Eloi Du Bois 16 Dec '09

16 Dec '09

Hi all, I would like to know how to change the layout of a given pixel type. For example, I would like to do something like: // Pixel = rgb16_pixel_t for example. template<class Pixel> void foo(Pixel & A) { typedef typename pixel<hsl_t, Pixel::bits>::type hsl_pixel_t; hsl_pixel_t a; color_convert(A, a); } Thank you by advance, Eloi.

2 4

[GIL]
by Eloi Du Bois 16 Dec '09

16 Dec '09

Hi all, Sorry to bother you with my problems but I am experiencing a new probable bug: I am trying to manage with data that are set as follow: P;P;P;P;...... Where P is a rgb pixel (10 bits per components) packed on an uint32 as follow: 00RGB;00RGB;00RGB;00RGB........ I mean there is two bits unused on each 32 bits pixel. So I tried to set up a view using packed_pixel and a bug occurs when using copy_and_convert_pixels... The very strange thing is that it is working when using color_convert on two pixels... I think there may exist something I didn't understood... Anyway, I give you the buggy code: /// 10 bits rgb packed to uint32_t starting at the 2nd bit typedef const packed_channel_reference<uint32_t, 22, 10, true> rgb10_packed_channel0_t; typedef const packed_channel_reference<uint32_t, 12, 10, true> rgb10_packed_channel1_t; typedef const packed_channel_reference<uint32_t, 02, 10, true> rgb10_packed_channel2_t; typedef mpl::vector3<rgb10_packed_channel0_t, rgb10_packed_channel1_t, rgb10_packed_channel2_t> rgb10_packed_channels_t; typedef packed_pixel<uint32_t, rgb10_packed_channels_t, rgb_layout_t> rgb10_packed_pixel_t; typedef view_type_from_pixel<rgb10_packed_pixel_t>::type rgb10_packed_view_t; // image data of dimension: {w,h} = {1,0} uint32_t *data=new uint32_t[1]; data[0] = 0xFFFFF00C; rgb10_packed_view_t vw10 = interleaved_view( 1, 0, (rgb10_packed_pixel_t*)( data ), sizeof( uint32_t ) ); rgb10_packed_pixel_t pix10 = *vw10.row_begin(0); rgb16_pixel_t pix16; // This is working color_convert(pix10, pix16); std::cout << "Right {R,G,B}={" << get_color(pix16, red_t()) << "," << get_color(pix16, green_t()) << "," << get_color(pix16, blue_t()) << "}" << std::endl; // Assert that are ok assert( get_color( pix16, red_t() ) == 0xFFFF ); assert( get_color( pix16, green_t() ) == 0xFFFF ); assert( get_color( pix16, blue_t() ) == 0x00C0 ); rgb16_image_t img16(vw10.width(), vw10.height()); rgb16_view_t vw16(view(img16)); // This isn't working with packed_view copy_and_convert_pixels(vw10, vw16); pix16 = *vw16.row_begin(0); std::cout << "Wrong {R,G,B}={" << get_color(pix16, red_t()) << "," << get_color(pix16, green_t()) << "," << get_color(pix16, blue_t()) << "}" << std::endl; // Assert that doesn't pass assert( get_color( pix16, red_t() ) == 0xFFFF ); assert( get_color( pix16, green_t() ) == 0xFFFF ); assert( get_color( pix16, blue_t() ) == 0x00C0 ); Hope this will help, Eloi.

3 5

boost.plot: integrating plotting in a C++ native application: general questions about which tools to use
by Hicham Mouline 16 Dec '09

16 Dec '09

Hello, I am writing an application with a native C++ computation engine (library) that generates plotable data 2d and 3d, and a plotting engine. I am trying to determine what tools/libraries to use for the plotting engine. My graphs are all time series in the x axis (typically dates but maybe day numbers). I have a y axis and sometimes a z axis as well. Data is available in std::vector/list< pair<> > or std::vector/list< boost::tuple<> >, sometimes std::map<k,v>, perhaps later boost::multi_array<2> or <3> as well, or in fact just native arrays of pairs or boost::tuples. Decisions are made by the users, tweaking parameters and seeing how the plots change. The application user interface will be as: 1. win command line and just the plotting being graphical 2. Linux command line and just the plotting being graphical 3. win .net interface - input of parameters to the computing engine, and the plotting being graphical 4. Linux with X (maybe gtk/qt) - input of parameters to the computing engine, and the plotting being graphical And the results of the computation will then need to be plotted. So far, I have seen these solutions: ***1 - With 1,2,3 and 4, I can see a write the numbers to a file, call the external process on windows that runs gnuplot that runs a script file to plot the file. Both 2D (y(x)) and 3D(z(x,y)) visualizations are pretty flexible, in particular 3D visualizations allow to rotate the graph and view from different angles. But this process seems tortuous, gnuplot accepts piped data on linux but not on windows without mingw/cigwin. It would be preferable to not generate intermediary files, especially if that is very large. There is also a gnuplot c++ interface, but that doesn't avoid running the gnuplot external process. ***2 - I've come across boost.plot and it generates svg files which have only 2D if I understood correctly, SVG doesn't express 3D, and then use a browser (chrome) or that tool that uses SVG as its native format, or use ImageDisplay for e.g.( this comes with c++ dev library, perhaps that helps to plot directly the svg without running the process externally ) Cons: no 3d (rotating and different angles) and still require external programs. ***3 - I don't know .net but it seems c# is more convenient for the GUI part (inputting parameters, selecting options), running the c++ computation engine, and .net probably has some plotting part (don't know about 3D plots and rotating though) Cons: non portable solution - how would c# plotting interact with native c++ stl? ***4 - gtk/qt : does it have plotting features? It is ported to linux and win, does the windows port requires cygwin/mingw? How does it interact with STL containers? The solution is ideally the quickest-to-deploy and most portable, with windows not requiring cygwin/mingw, and not needing to run an external process. The need for portability comes from hardware requirements machines with a large number of processor cores run linux, while smaller boxes run win. I appreciate there are a lot of questions here, that deal with many topics and I thank everyone for answers or suggestions, Regards,

5 6

[boost-users][asio] async operations order.
by Germán Diago 16 Dec '09

16 Dec '09

Hello. I'm implementing a fully asynchronous server and I would like to know the order of async operations. The server receives, first of all, a size, and later the data. The onSizeRead handler allocates the memory required to store the data that is coming after the async_read. So I would like to know if this buffer will be available when onDataRead is called. so I get the size and data with two async_read operations. I would like to know if the relative order of the async calls is respected, since I'm reading from the same socket for both operations and I need the resources dictated by the first read before using the second one.

2 1

Compiler crash with Phoenix and PropertyTree.
by Surya Kiran Gullapalli 16 Dec '09

16 Dec '09

Hello all, I'm seeing a compiler crash (MSVC 8.0) with the following piece of code. I'm using Boost.Phoenix along with Boost.PropertyTree namespace pt = boost::property_tree ; pt::ptree tree ; boost::phoenix::bind (&pt::ptree::put<string, bool>, tree, string("Temp.Flag"), true) ; Attached is the build log. Actually, this is a test program, I wrote to reproduce a C4180 warning, but I see a crash here (actually I see C4180 also) Let me know if I'm doing something wrong. Thanks, Surya

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is visitor object destroyed immediately after the execution of depth_first_search?
by Suresh Kumar 16 Dec '09

16 Dec '09

Hi, my idea is to get the finishing order of vertices in dfs by pushing the vertices in a vector and return it later through a function return value from my visitor class object. //code snippet int main() { my_visitor vis; depth_first_search(g, visitor(vis)); cout << "size of fin vector = " << vis.finishingOrder.size() << endl; //i get zero here!!! } class my_visitor: public default_dfs_visitor { public: my_visitor(){} void finish_vertex(Vertex u, const Graph & g){finishingOrder.push_back(u);}; vector<Vertex> getFinishingOrder(void){return finishingOrder;} private: vector<Vertex> finishingOrder; }; My problem: size of the finishingOrder vector is zero outside the my_visitor::finish_vertex method. I checked its size inside the my_visitor::finish_vertex method and its value is increasing every time a vertex is finished. Does I miss something in the understanding of the visitor concept? Thanks suresh -- R. Suresh Kumar PhD Student, Vislab #216, Engineering II Bldg University of California, Riverside, CA 92521

2 2

[phoenix] A simple lambda func as boost::function
by Richard Vock 16 Dec '09

16 Dec '09

Hi boost gurus, after some time and a lot of pain I somehow managed to work with boost.lambda in a way that actually outweighs the costs (code elegance versus time spent compiling it), but I miss some features (like local variables) I see in that cute phoenix documentation and a lot of mailing list threads which all seem to propose using phoenix rather than lambda (and it indeed looks a lot better). But whenever I try to use it, I somehow fail at the most simple tasks. Take for example this minimalistic code example here (note the use of #define USE_LAMBDA): http://pastebin.com/m3f590a01 Both versions (with and without USE_LAMBDA defined) compile well on the most recent stable g++ compiler, but the phoenix version does not output anything. Not at all. Also note, that this exact lambda expression is mentioned here: http://tinyurl.com/ybmp2lw (well, without the << "\n" but that doesn't change the problem) Could someone please enlighten me by telling me what I have to do here? I should mention I am bound to boost::function, not some funky phoenix::actor derivations... Greets, Richard Vock

4 9

Boost version of Loki StaticDispatcher
by Glenn Macgregor 16 Dec '09

16 Dec '09

Hi All, I am looking to replace Loki with Boost since we use Boost for other parts of projects. Example of current situation: template<typename T> struct param_traits {}; template<> struct param_traits<long> { typedef long param_type; static param_type init() { return 0; } static bool fromString(const string &str, param_type &value, int base) { // Do conversion } static string toString(param_type &value, const string &fmt) { // Do conversion } }; template<> struct param_traits<double> { typedef double param_type; static param_type init() { return 0.0; } static bool fromString(const string &str, param_type &value, int base) { // Do conversion } static string toString(param_type &value, const string &fmt) { // Do conversion } }; Class BaseParamValue { public: virtual ~BaseParamValue() {}; virtual bool fromString(const string &str, int base = 0) = 0; virtual string toString(const string &ftm = "") = 0; static BaseParamValue *create(const string &type) { if (type == string("LONG")) { return new ParamValue<long>(); } else if (type == string("DOUBLE")) { return new ParamValue<double>(); } return 0; } }; template<typename T> class ParamValue : public BaseParamValue { public: typedef param_traits<T> traits_type; typedef typename traits_type::param_type ParamType; ParamValue() : mValue() { } ~ParamValue() {}; bool fromString(const string &str, int base) { return traits_type::fromString(str, mValue, base); } string toString(const string &fmt) { return traits_type::toString(mValue, fmt); } private: ParamType mValue; }; class Param { public: Param() : mParamValue(0) { } Param(const string &type) : mParamValue(BaseParamValue::create(type)) { } ~Param() { delete mParamValue; } private: BaseParamValue *mParamValue; }; So as you can see I store a BaseParamValue in the param class instead of making the Param class itself a template, which is not an option at the moment. I am currently using loki StaticDispatcher to up cast (I guess) to the correct templatized instance in the operations. What I am trying to get done is the following: class TestVisit { public: TestVisit(); ~TestVisit(); void visit(const ParamValue<long> &value); void visit(const ParamValue<double> &value); }; Is there a way in Boost to go from a BaseParamValue * to the actual templatized ParamValue and call the correct visit using: testVisit.visit(*mParamValue). Currently I get a compiler error saying: cannot conver parameter 1 from 'BaseParamValue' to 'const ParamValue<T> &' Sorry for the long post, thanks in advance. Glenn

2 1

BOOST_FOREACH with Index
by The Dude 15 Dec '09

15 Dec '09

Hello, Boost::foreach is very useful for iterating over a sequence and doing something that depends only on the iterated element, e.g., <code> BOOST_FOREACH(const Foo &f, foos) cout << f.bar() << endl; </code> However, I often need to iterate over a sequence and do some operation that depends on both the iterated element and the iteration index. E.g., I would like something like <code> BOOST_FOREACH(size_t i, const Foo &f, foos) cout << "The bar of element " << i << " is " << f.bar() << endl; </code> Is there an easy way to do so? Thanks & Bye, TD

7 11

[program-options] c++/clr problem with variables_map
by Freeman, Ian J. 15 Dec '09

15 Dec '09

Greetings. This is my first use of Boost, despite knowing of its existence for quite some time. I've compiled Boost 1.41 with msvc and am using basically the tutorial code for program_options. When I compile it as native c++ with the msvc compiler, it works fine, however when I wrap the same code into a c++ dll to be called via .NET C# code, the variables_map always fails to locate the program options via .count("option_name"). I've stepped through the debugger and that doesn't really help because the debugger is unable to list the contents of variables that are outside of the current stack frame (according to Microsoft), even though when I try to access the contents of the variables the stack pointer is in their respective single-threaded assemblies. I'm hoping someone here has experience integrating Boost with .net via a c++/clr dll and can help point me to what the problem might be. Somewhere in the parse_command_line() call is where I lose track of the variable data. Before the call to po::store(po::parse_command_line(argc, cstr, desc), vm); the argc, argv, and desc variables contain the correct contents. The result of the below code is that "Compression level was not set." is always output. The non-working dll code: // mtest1.cpp : Defines the exported functions for the DLL application. // #include "stdafx.h" #include <tchar.h> #define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers #include <windows.h> #include <iostream> #include <msclr/marshal.h> #include <boost/program_options.hpp> #using<mscorlib.dll> using namespace System; using namespace std; using namespace msclr::interop; namespace po = boost::program_options; namespace boost_TestDLL { public ref class Boost_Test { public: static void Test(int argc, array<String^>^ argv) { //convert String array to char* array marshal_context ^ context = gcnew marshal_context(); char** cstr = new char*[argc]; for(int i = 0; i < argc; i++) { cstr[i] = (char*)context->marshal_as<const char*>(argv[i]); } po::options_description desc("Allowed options"); desc.add_options() ("help", "produce help message") ("compression", po::value<int>(), "set compression level") ; po::variables_map vm; po::store(po::parse_command_line(argc, cstr, desc), vm); po::notify(vm); if (vm.count("help")) { cout << desc << "\n"; } else if (vm.count("compression")) { cout << "Compression level was set to " << vm["compression"].as<int>() << ".\n"; } else { cout << "Compression level was not set.\n"; } delete context; } }; }

1 0

[asio] Error in async_accept
by Germán Diago 15 Dec '09

15 Dec '09

Hello. I have this code (the variables that end with _ are instance variables). The code works well as is, in a synchronous way. void tcpServer::startAccept() { tcpConnection::pointer new_connection = tcpConnection::create(acceptor_.io_service()); boost::system::error_code error; acceptor_.accept(new_connection->socket()); onAccept(new_connection, boost::system::error_code()); } void tcpServer::onAccept(tcpConnection::pointer new_connection, const boost::system::error_code & error) { if (!error) { if (currentconnections_ < maxconnections_) { boost::lock_guard<boost::mutex> l(mutexcurrconnections_); /*connectionsinfo_.push_back(ServerConnectionInfoPtr(new ServerConnectionInfo( new_connection->socket().remote_endpoint().address().to_string(), new_connection->socket().remote_endpoint().port(), new_connection))); */ currentconnections_++; } else throw std::runtime_error("The server is full. No more connections accepted"); /*boost::asio::async_read(new_connection->socket(), boost::asio::buffer(bufferread_), boost::bind(&tcpServer::onRead, this, _1, _2)); */ vector<char> vecrecv(12); std::size_t readsize = boost::asio::read(new_connection->socket(), boost::asio::buffer(vecrecv)); cout << "Server received " << readsize << " bytes: " << endl; copy(vecrecv.begin(), vecrecv.end(), ostream_iterator<char>(cout)); cout << endl; std::string helloclient = "hello client"; std::vector<char> sendvec(helloclient.begin(), helloclient.end()); //TODO:Cambiar por receiveAllData() //std::size_t writesize = new_connection->socket().send(boost::asio::buffer(sendvec, sendvec.size())); std::size_t writesize = boost::asio::write(new_connection->socket(), boost::asio::buffer(sendvec)); std::cout << "Written " << writesize << " bytes" << std::endl; } startAccept(); } But if I change the function startAccept so that instead of doing what it used to do, it does an asynchronous_accept: void tcpServer::startAccept() { tcpConnection::pointer new_connection = tcpConnection::create(acceptor_.io_service()); boost::system::error_code error; acceptor_.async_accept(new_connection->socket(), boost::bind(&tcpServer::onAccept, this, boost::ref(new_connection), boost::asio::placeholders::error)); } I get the following errors: terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >' what(): Socket operation on non-socket terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >' what(): Connection reset by peer Anyone can help? I have no clue of what's happening. The socket is a shared_ptr, so it should be there when I use onAccept. Don't know what happens. Thanks for your time.

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Re: [Boost-users] [asio] Sending large packages
by Nicola Michael Gutberlet 15 Dec '09

15 Dec '09

Some testing showed that the maximum package (load) size of boost::asio::write/read() for a TCP socket seems to be 1007 kB _____ From: Nicola Michael Gutberlet [mailto:nicola.gutberlet@hhi.fraunhofer.de] Sent: 15 December 2009 17:11 To: 'boost-users(a)lists.boost.org' Subject: [asio] Sending large packages Dear all, Is there a well-defined way of sending large packages over TCP? Or do I have to split the packages on my own? For explanation: I want to send images (size around 6MB). Best regards, Nicola ***** Nicola Michael Gutberlet (Dipl.-Inf.) Image Processing Dept. Fraunhofer-Institut für Nachrichtentechnik Heinrich-Hertz-Institut Einsteinufer 37 10587 Berlin Phone: +49 (0) 30 / 31002-564 Room: AM 601

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Re. [Boost Graph] newbie - dijkstra & external weightmap
by Fergal Dalton 15 Dec '09

15 Dec '09

Thanks again, > > > > But I'm talking about edge weights - why would you put in > > "get(vertex_index,g)" and not "get(edge_index,g)" or similar (I've tried this > > simple substitution and it doesn't work; so it's obviously more complex than > > that)? > OK. I misread that -- you do want edge_index. You will need to provide > them yourself, though. You must have some mapping from edges to numbers > already to index the vector; that needs to be turned into a property map. Exactly, that's the bit I can't understand. How do I do that? It's not a stupid question, I've been banging my head against it for 2 weeks but the documentation is full of examples far more complex than I need and I lose myself in the syntax (I'm a half-newbie to C++, which is not helping). > I do not know the exact cause of the operator[] error; you > removed too much of the error message to tell. So it's probably due to using "vertex_index" to get edge weights right? In any case, let's see if it still occurs when we figure out the right property_map. If so, then I can paste the entire error (it's very long and, to me, indecipherable). Fergal.

2 1

[asio] Sending large packages
by Nicola Michael Gutberlet 15 Dec '09

15 Dec '09

Dear all, Is there a well-defined way of sending large packages over TCP? Or do I have to split the packages on my own? For explanation: I want to send images (size around 6MB). Best regards, Nicola ***** Nicola Michael Gutberlet (Dipl.-Inf.) Image Processing Dept. Fraunhofer-Institut für Nachrichtentechnik Heinrich-Hertz-Institut Einsteinufer 37 10587 Berlin Phone: +49 (0) 30 / 31002-564 Room: AM 601

1 0

Re: [Boost-users] [Boost Graph] newbie - dijkstra & external weightmap
by Fergal Dalton 15 Dec '09

15 Dec '09

> Use iterator_property_map > (http://www.boost.org/doc/libs/1_41_0/libs/property_map/doc/iterator_propert…) > using syntax such as the following (replacing > "weight_map(agent_weightmap)" in the code just above): > > weight_map( > make_iterator_property_map( > agent_weightmap.begin(), > get(vertex_index, g))) > > You will need to include <boost/property_map/property_map.hpp> to get > iterator_property_map. > > -- Jeremiah Willcock > Thanks Jeremiah, But I'm talking about edge weights - why would you put in "get(vertex_index,g)" and not "get(edge_index,g)" or similar (I've tried this simple substitution and it doesn't work; so it's obviously more complex than that)? In any case I've tried more or less exactly what you suggested as follows but the compiler spits out a long error, reported below (libboost1.40): -------- #include <boost/property_map/property_map.hpp> class road; typedef adjacency_list<setS,vecS,undirectedS,no_property,road> Graph; typedef boost::vertex_descriptor vdest; vdest shortest_path(Graph& g, vdest src, vdest dst) { vector<vdest> parent(num_vertices(g)); vector<double> agent_weightmap(num_edges(g)); dijkstra_shortest_paths(g,src, //weight_map(get(&road::transit_time,g)) // ---> this weight_map works weight_map(make_iterator_property_map(agent_weightmap.begin(), get(vertex_index, g))) .predecessor_map(make_iterator_property_map(parent.begin(), get(vertex_index, g)))); vdest vd; for (vd=dst ; parent[vd]!=src ; vd=parent[vd]); return(vd); } -------- Compiler error: ------- /usr/include/boost/property_map/property_map.hpp: In function ‘Reference boost::get(... [lots of instantiated froms] ... instantiated from [dijkstra_shortest_paths(...)] /usr/include/boost/property_map/property_map.hpp:317: error: no match for ‘operator[]’ in ‘(const boost::iterator_property_map<__gnu_cxx::__normal_iterator<double*, .... /usr/include/boost/property_map/property_map.hpp:354: note: candidates are: R boost::iterator_property_map<RandomAccessIterator, IndexMap, ....... ------- I'm getting a backward warning on hash_set included from boost/graph/adjacency_list.hpp - could this be an issue? Thanks again, Fergal.

2 1

[type_traits] data pointers and function pointers
by Edward Diener 15 Dec '09

15 Dec '09

It is difficult in some places in the type_traits documentation to tell when the documentation mentions "pointer" whether this refers to data pointers, function pointers, member data pointers, and/or member function pointers. I assume that if the documentation just refers to "pointer" that it should mean all of the above. But here goes: 1) Does the 'remove_pointer' refer to all of the above ? The examples are only for a single one of the above, a data pointer. 2) The 'is_pointer' doc does say it excludes pointer to members by which I assume this means both member data and member functions. Is there any way to tell whether a pointer is a function pointer or a data pointer by using type_traits since 'is_pointer' includes both ?

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[ANN] CLI 1.1.0 released
by Boris Kolpackov 15 Dec '09

15 Dec '09

Hi, Seeing that I've got a lot of useful feedback for the initial release, I am pleased to announce the availability of CLI 1.1.0. CLI is an open-source (MIT license), cross-platform command line interface compiler for C++. It allows you to specify the options that your program supports, their types, default values, and documentation. This specification can then be automatically translated to C++ classes that implement parsing of the command line arguments and provide a convenient and type-safe interface for accessing the extracted data. The automatic usage and documentation generation is by far the biggest new feature in this release. The usage information is formatted during compilation and the documentation can be generated in the HTML and man page formats. For an example of the HTML output, see the documentation for the CLI compiler itself (you may also want to check the cli.1 man page and the usage information printed by the compiler): http://www.codesynthesis.com/projects/cli/doc/cli.xhtml Other new features in this release: * Optional generation of modifiers in addition to accessors. * Support for erasing the parsed elements from the argv array. * Support for custom argument sources via an abstract scanner interface. * Support for reading command line arguments from the argv array as well as files specified with command line options. For a more detailed list of new features in this release see: http://www.codesynthesis.com/pipermail/cli-users/2009-December/000001.html More information, documentation, and source code distributions are available from the project's web page: http://www.codesynthesis.com/projects/cli/ Enjoy, Boris -- Boris Kolpackov, Code Synthesis http://codesynthesis.com/~boris/blog Open-source XML data binding for C++ http://codesynthesis.com/products/xsd XML data binding for embedded systems http://codesynthesis.com/products/xsde Command line interface to C++ compiler http://codesynthesis.com/projects/cli

1 0

Template metaprogramming technique for operator overloading
by Edward Diener 15 Dec '09

15 Dec '09

I could not find this in type_traits, or any other Boost TMP library, but I am wondering if there is any TMP technique which can determine if a user-defined type supports a particular operator overload for that type ?

3 2

[1.41][serialization] deserialization of weak_ptr fails
by Alexander Gutenev 15 Dec '09

15 Dec '09

The example below works in 1.40 and fails in 1.41 #include <string> #include <sstream> #include <vector> #include <boost/smart_ptr.hpp> #include <boost/serialization/serialization.hpp> #include <boost/serialization/shared_ptr.hpp> #include <boost/serialization/vector.hpp> #include <boost/archive/xml_oarchive.hpp> #include <boost/archive/xml_iarchive.hpp> struct X : boost::enable_shared_from_this<X> { X(){} virtual ~X() {} explicit X(int i) : i(i) {} template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & boost::serialization::make_nvp("i", i); (void) version; } int i; }; typedef boost::shared_ptr<X> PX; typedef std::vector<PX> VPX; int main() { std::ostringstream oss; VPX vpx; vpx.push_back(PX(new X(2))); vpx.push_back(PX(new X(5))); vpx.push_back(PX(new X(7))); boost::archive::xml_oarchive oa(oss); oa << boost::serialization::make_nvp("v", vpx); vpx.clear(); std::string s = oss.str(); std::istringstream iss(s); boost::archive::xml_iarchive ia(iss); ia >> boost::serialization::make_nvp("v", vpx); PX px = vpx[1].get()->shared_from_this(); return 0; }

2 3

[Boost Graph] newbie - dijkstra & external weightmap
by Fergal Dalton 14 Dec '09

14 Dec '09

Hi, I'm trying to write a program which considers some "agents" traversing a graph following dijkstra, from some source vertex to some destination. Each agent will have a different weightmap for the network. Therefore, I need a routine to which I pass the source & destination vertices, and a pointer or reference to the calling agents weightmap. This routine should return the next step for that agent. Alternatively, I could write a visitor which, everytime any agent calls dijkstra, overwrites the weight in the bundled edge structure, with that agent's weights array. Here below is the nuts of what I have, which works but only with the bundled edge_weight (called "transit_time"). Below that, is what I'd like to do. Anyway, the long & short of it is, I couldn't wrap my head around the syntax for either. I've looked in the books, in the lists, on the site, and I can't find any help on how to incorporate external weightmaps with dijkstra. Can anyone tell me how to proceed? Thanks, Fergal. --------------- This works, but only with the bundled weight property, identical for all agents: class road; typedef adjacency_list<setS,vecS,undirectedS,no_property,road> Graph; typedef Graph::vertex_descriptor vdest; vdest shortest_path(Graph& g, vdest src, vdest dst) { vector<vdest> parent(num_vertices(g)); dijkstra_shortest_paths(g,src,weight_map(get(&road::transit_time,g)) .predecessor_map(make_iterator_property_map(parent.begin(), get(vertex_index, g)))); vdest vd; for (vd=dst ; parent[vd]!=src ; vd=parent[vd]); // ATTN: isolated vertices return(vd); } ----------------- What I would like, where agent_weightmap is (a pointer to) the agent's weightmap: class road; typedef adjacency_list<setS,vecS,undirectedS,no_property,road> Graph; typedef Graph::vertex_descriptor vdest; vdest shortest_path(Graph& g, vdest src, vdest dst, vector<double> agent_weightmap) { vector<vdest> parent(num_vertices(g)); dijkstra_shortest_paths(g,src,weight_map(agent_weightmap)) .predecessor_map(make_iterator_property_map(parent.begin(), get(vertex_index, g)))); vdest vd; for (vd=dst ; parent[vd]!=src ; vd=parent[vd]); // ATTN: isolated vertices return(vd); }

2 1

Linker error with boost::filesystem
by seandr＠millisecond.com 14 Dec '09

14 Dec '09

Hi, I'm trying to use the boost::filesystem library, and I'm getting two linker errors that I can't figure out. Does anyone have any ideas why I'm seeing these and how I can fix them? 1. error LNK2001: unresolved external symbol "class boost::filesystem::file_status __cdecl boost::filesystem::detail::status_api(class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > const &,class boost::system::error_code &)" 2. error LNK2001: unresolved external symbol "class boost::system::error_code __cdecl boost::filesystem::detail::set_current_path_api(class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > const &)" I'm using the msvc8 toolset. Thanks, Sean

1 0

documentation build problem
by Stefan Strasser 14 Dec '09

14 Dec '09

I get the following error when I try to build any documentation with boost 1.41: cat "/tmp/jam112c3106.000" > "/bin/boostbook_catalog.xml" obviously it can't copy to /bin/, but BOOST_ROOT is set. not only is the root missing from the directory, but the bin directory is called "bin.v2", not "bin". I can't figure out where this "cat" is coming from or how to set the path correctly. can anyone help me with this?

2 1

io_service object pool X io_service::run thread pool
by Matheus Araújo Aguiar 14 Dec '09

14 Dec '09

Hello dear list, I am using boost for some months now and i have implemented a server which creates several threads of io_service::run in order to respond to async writes and reads. I am looking for some performance improvements and just read the http server 2 example and saw that it uses a pool of io_service objects. So my question is, what would be the pros and cons of using such a pool instead of a thread pool of io_service::run ? Thanks in avance and best regards, -- Matheus Araújo Aguiar Computer Scientist matheus.pit(a)gmail.com

1 0

[thread] 1 blocks are still reachable in loss record
by Sakharuk, Vladimir 14 Dec '09

14 Dec '09

Hi all, Valgrind reports follows memory leak. ==24567== at 0x4A1FE1B: malloc (vg_replace_malloc.c:207) ==24567== by 0x6AC7FDD: boost::detail::get_once_per_thread_epoch() (in /app/local/pkgs/boost/lib/libboost_thread-gcc41-mt-1_39.so.1.39.0) ==24567== by 0x6AC4A17: void boost::call_once<void (*)()>(boost::once_flag&, void (*)()) (in /app/local/pkgs/boost/lib/libboost_thread-gcc41-mt-1_39.so.1.39.0) ==24567== by 0x6AC1D96: boost::detail::get_current_thread_data() (in /app/local/pkgs/boost/lib/libboost_thread-gcc41-mt-1_39.so.1.39.0) ==24567== by 0x6AC36B4: boost::thread::join() (in /app/local/pkgs/boost/lib/libboost_thread-gcc41-mt-1_39.so.1.39.0) Code is looks like: thread_->join(); delete thread_; Is there a way to fix it? Regards \/lad. =============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ===============================================================================

2 1

[date_time] Is there a more direct way to format time strings?
by Sajjan Kalle 14 Dec '09

14 Dec '09

In the examples all formatting of strings seems to use date_facet, which requires ( ? ) the use of streams and locales. Is there a more direct way to format a time?

1 0

[program-options] Modifying the variable_value of a variables_map...
by W Eryk Wolski 14 Dec '09

14 Dec '09

Hi, I am using program options to parse cmdline parameters. I would like to use the variable_map to pass parameters in my application and I would like to modify the values of the boost::program_options::variable_map. while variable_value provides a method value() allowing me to modify the content... the variable_map "overrides" the operator[] of the std::map const variable_value& operator[](const std::string& name) const; so something like this (where mmap is a variable_map) mmap["x"].value() = 2.; does not compile..... I tried this because the doc reads : The variables_map class can be used just like std::map, except that values stored there must be retrieved with the as method shown above. (If the type specified in the call to the asmethod is different from the actually stored type, an exception is thrown.) Using the iterator it is map_t::iterator it(mmap.find("x")); boost::program_options::variable_value & vx(it->second); vx.value() = 2.; still easily possible to modify the variable_value . I would like to better understand why the operator[] returns a const variable_value? regards Eryk Here is some sample code I wrote to test how to modify a variable_map. boost::any a(1.); boost::program_options::variable_value vv(a,false); //variable_value provides the method value() returning a reference via which I am able to modify the content. // i.e. vv.value() = 2.1; //I store the variable_value in a variables_map typedef boost::program_options::variables_map map_t; map_t mmap; mmap.insert( std::make_pair(std::string("x"), vv ) ); std::cout << mmap["x"].as<double>() << std::endl; //now I would like to modify the value.. mmap["x"].value() = 2.; //does not compile..... ///error C2678: binary '=' : no operator found which takes a left-hand operand of type 'const boost::any' (or there is no acceptable conversion) // thats because abstract_variables_map defines the operator[] as follows // const variable_value& operator[](const std::string& name) const; //my workaround... map_t::iterator it(mmap.find("x")); boost::program_options::variable_value & vx(it->second); vx.value() = 2.; std::cout << mmap["x"].as<double>() << std::endl; -- Witold Eryk Wolski Heidmark str 5 D-28329 Bremen tel.: 04215261837

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[Interprocess] How to prevent collision of mapping addresses with DLL Loading on Windows?
by pheres 14 Dec '09

14 Dec '09

Hi, I do something like fixed_managed_shared_memory segment (open_only, "MyFixedAddressSharedMemory" //Shared memory object name ,(void*)0x30000000 //Mapping address to establish an shared memory segment which gets faded into the virtual address space of every process taking part on the IPC at the same offset (this is important for me). This works quite well for most processes. But problems arise with IPC-clients using a lot of delay loaded DLL's. This seems to be especially to be true for MFC windows programs. While normal loaded DLL's goes to 0x10000000, or their fixed address or are relocated to some there like 0x0..., some windows delay loaded DLL's seem to can be placed nearly anywhere inside the virtual address space, This makes the success of establishing the IPC into a lottery game. For example I used 0x40000000 for a shared memory range in the IPC clients. One client used windows MFC. Taking part on the IPC inside this client should happen after some pushbutton was pressed but it failed sometimes. I found out that in the moment of the button press windows delay loaded two additional DLL's which unfortunately faded in at the memory range I configured for the IPC (around 0x40000000). I was not able to find a 100% satisfying solution. The best thing I came up with was: -link everything you can static -Link the self produced DLL's with fixed base address -Allocate the memory range as the first call in main() using OS-specific functions like VirtualAlloc() -Free the allocated memory just before initializing the IPC (so it's sure that no delay loaded DLL can be faded in in the mean time) -for the rest (mainly windows or other 3rd party DLLs) hope the best This seem to work at least for now but I guess there must be a more elegant solution. I did google a lot about the MS loader/run time linker, but there seems to be no option to prevent it from selecting a certain address range. Could anybody help me out? Thank you in advance! Best Regards Joerg

3 8

[preprocessor]
by Christian Henning 14 Dec '09

14 Dec '09

Hi there, let's assume I have a structure which takes 5 ints as template parameters. template< int NumChannel , int FirstChannelBits = 0 , int SecondChannelBits = 0 , int ThirdChannelBits = 0 , int FourthChannelBits = 0 , int FifthChannelBits = 0 > struct pixel_type_generator { /* omitted*/ } The first parameter is different as it defines how many of the other parameters are actually used. How can I use boost::preprocessor to get this kind of code repetition: // one channel test pixel_pixel_test< pixel_type_generator< 1, 1 >::type >(); pixel_pixel_test< pixel_type_generator< 1, 2 >::type >(); pixel_pixel_test< pixel_type_generator< 1, 3 >::type >(); pixel_pixel_test< pixel_type_generator< 1, 4 >::type >(); pixel_pixel_test< pixel_type_generator< 1, 5 >::type >(); pixel_pixel_test< pixel_type_generator< 1, 6 >::type >(); // up to 64 // two channels test pixel_pixel_test< pixel_type_generator< 2, 1, 1 >::type >(); pixel_pixel_test< pixel_type_generator< 2, 1, 2 >::type >(); pixel_pixel_test< pixel_type_generator< 2, 1, 3 >::type >(); // ... pixel_pixel_test< pixel_type_generator< 2, 1, 32 >::type >(); pixel_pixel_test< pixel_type_generator< 2, 2, 1 >::type >(); pixel_pixel_test< pixel_type_generator< 2, 2, 2 >::type >(); pixel_pixel_test< pixel_type_generator< 2, 2, 3 >::type >(); // ... // ... pixel_pixel_test< pixel_type_generator< 2, 32, 32 >::type >(); // last two parameters up to 32 - which means there are 32 x 32 calls // three channels test pixel_pixel_test< pixel_type_generator< 3, 1, 1, 1 >::type >(); pixel_pixel_test< pixel_type_generator< 3, 1, 1, 2 >::type >(); // ... // last three parameters up to 21 - which means there are 21 x 21 x 21 calls // four channels test pixel_pixel_test< pixel_type_generator< 4, 1, 1, 1, 1 >::type >(); pixel_pixel_test< pixel_type_generator< 4, 1, 1, 1, 2 >::type >(); // ... // last four parameters up to 16 - which means there are 16 x 16 x 16 x 16 calls // five channels test pixel_pixel_test< pixel_type_generator< 5, 1, 1, 1, 1, 1 >::type >(); pixel_pixel_test< pixel_type_generator< 5, 1, 1, 1, 1, 2 >::type >(); // ... // last four parameters up to 12 - which means there are 12 x 12 x 12 x 12 x 12 calls As you might realize, I try to test every combination until the sum of all channels hits 64. Thanks, Christian

4 11

regex
by Dejan 14 Dec '09

14 Dec '09

Hi all, I have a question regarding boost::regex. I have one regex which should identify my string AND cut it into pieces. I've tried with regex_token_iterator and cmatch and failed. code: #include <string> #include <iostream> #include <boost/regex.hpp> int main() { std::string s("s0,s1,s2"); boost::regex re("^(s[0-9])(,s[0-9])*$"); // 1. attempt boost::sregex_token_iterator i(s.begin(), s.end(), re), j; while(i!=j) { std::cout << *i++ << std::endl; } // 2. attempt boost::cmatch matches; if(boost::regex_search(s.c_str(), matches, re)) { for(int p=0, q=matches.size(); p<q; p++) { std::string match(matches[p].first, matches[p].second); std::cout << match << std::endl; } } } output: s0,s1,s2 s0,s1,s2 s0 ,s2 desired output: s0,s1,s2 s0 ,s1 ,s2 Any hints how to do this in one step? Thanks!

2 2

Re: [Boost-users] BOOST_FOREACH with Index
by pete＠pcbartlett.com 14 Dec '09

14 Dec '09

> Nat Goodspeed wrote: > > Maybe this shouldn't be a BOOST_FOREACH feature at all. As with > Python's > > builtin enumerate() function, maybe what we want here is an > iterator > > adapter that dereferences to a std::pair > original_iterator_value_type>? > Couldn't you just do a BOOST_FOREACH over combine(count_range(), > foos) > for that? > (uses zip_iterator) Yup, Nat's idea is a nice one and easy to implement. As Eric alluded to with his reference to the ticket on FOREACH_FIELD, the heart of the matter really though is getting a syntactically convenient version. We've seen this situation - where we have the neat iterators/ranges but not the syntactic convenience - a few times (REVERSE_FOREACH, FOREACH_FIELD, this "FOREACH_WITHINDEX" spring to mind) - I wonder if there is an opportunity to expose a lower level API in the FOREACH mini-library that would enable advanced users to build such macros themselves.

1 0

Hello Everyone
by Rick Eyre 14 Dec '09

14 Dec '09

I have a problem with installing boost. I downloaded the installer 1.40 for VC 2008 and followed all the instructions in the manual but I'm getting the error 1>LINK : fatal error LNK1104: cannot open file 'libboost_thread-vc90-mt-gd-1_40.lib'. This is from the header #include <boost/thread/thread.hpp> in my code. Does anyone know what I can possible do to resolve this? Thanks

4 10

Compilation error Boost lambda function (Boost 1.40)
by Joost Kraaijeveld 13 Dec '09

13 Dec '09

Hi, What is wrong in my syntax in the std::for_each call (the BOOST_FOREACH works fine): ... class Session { virtual void stopSession(); } class ServerSession : public Sessoon { } typedef std::map<unsigned long, ServerSession*> ServerSessions; ServerSessions serverSessions; ... ... typedef std::pair<unsigned long, ServerSession*> ServerSessionsIterator; BOOST_FOREACH(ServerSessionsIterator session,serverSessions) { session.second->stopSession(); } std::for_each( serverSessions.begin(), serverSessions.end(), boost::lambda::bind( &ServerSession::stopSession, // function boost::bind(&ServerSessions::value_type::second, boost::lambda::_1))); // object The actual error is: make -k -j6 all /bin/bash ../libtool --tag=CXX --mode=compile g++ -DHAVE_CONFIG_H -I. -I/home/jkr/Programming/C++/Dagda/library/DagdaCom -I../../include/Dagda/DagdaConfig -DDEVELOPMENT -DDANUEXE=1 -I/home/jkr/Programming/C++/Danu/include/Danu -DDAGDADLL=1 -I /home/jkr/Programming/C++/Dagda/library/../include/Dagda -pipe -Wall -Wextra -Wundef -Wshadow -Wconversion -I/usr/include -I/usr/lib/wx/include/gtk2-unicode-release-2.8 -I/usr/include/wx-2.8 -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -D__WXGTK__ -pthread -g -O2 -MT libdagdacom_la-Server.lo -MD -MP -MF .deps/libdagdacom_la-Server.Tpo -c -o libdagdacom_la-Server.lo `test -f 'Server.cpp' || echo '/home/jkr/Programming/C++/Dagda/library/DagdaCom/'`Server.cpp libtool: compile: g++ -DHAVE_CONFIG_H -I. -I/home/jkr/Programming/C++/Dagda/library/DagdaCom -I../../include/Dagda/DagdaConfig -DDEVELOPMENT -DDANUEXE=1 -I/home/jkr/Programming/C++/Danu/include/Danu -DDAGDADLL=1 -I /home/jkr/Programming/C++/Dagda/library/../include/Dagda -pipe -Wall -Wextra -Wundef -Wshadow -Wconversion -I/usr/include -I/usr/lib/wx/include/gtk2-unicode-release-2.8 -I/usr/include/wx-2.8 -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -D__WXGTK__ -pthread -g -O2 -MT libdagdacom_la-Server.lo -MD -MP -MF .deps/libdagdacom_la-Server.Tpo -c /home/jkr/Programming/C++/Dagda/library/DagdaCom/Server.cpp -fPIC -DPIC -o .libs/libdagdacom_la-Server.o /usr/include/boost/lambda/detail/actions.hpp: In static member function ‘static RET boost::lambda::function_action<2, T>::apply(A1&, A2&) [with RET = void, A1 = void (DagdaCom::Session::* const)(), A2 = const boost::_bi::bind_t<DagdaCom::ServerSession* const&, boost::_mfi::dm<DagdaCom::ServerSession*, std::pair<const long unsigned int, DagdaCom::ServerSession*> >, boost::_bi::list1<boost::arg<1> > >, T = boost::lambda::detail::unspecified]’: /usr/include/boost/lambda/detail/lambda_functor_base.hpp:418: instantiated from ‘RET boost::lambda::lambda_functor_base<boost::lambda::action<2, Act>, Args>::call(A&, B&, C&, Env&) const [with RET = void, A = std::pair<const long unsigned int, DagdaCom::ServerSession*>, B = const boost::tuples::null_type, C = const boost::tuples::null_type, Env = const boost::tuples::null_type, Act = boost::lambda::function_action<2, boost::lambda::detail::unspecified>, Args = boost::tuples::tuple<void (DagdaCom::Session::* const)(), const boost::_bi::bind_t<DagdaCom::ServerSession* const&, boost::_mfi::dm<DagdaCom::ServerSession*, std::pair<const long unsigned int, DagdaCom::ServerSession*> >, boost::_bi::list1<boost::arg<1> > >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>]’ /usr/include/boost/lambda/detail/lambda_functors.hpp:175: instantiated from ‘typename T::sig<boost::tuples::tuple<A&, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >::type boost::lambda::lambda_functor<Base>::operator()(A&) const [with A = std::pair<const long unsigned int, DagdaCom::ServerSession*>, T = boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (DagdaCom::Session::* const)(), const boost::_bi::bind_t<DagdaCom::ServerSession* const&, boost::_mfi::dm<DagdaCom::ServerSession*, std::pair<const long unsigned int, DagdaCom::ServerSession*> >, boost::_bi::list1<boost::arg<1> > >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >]’ /usr/include/c++/4.3/bits/stl_algo.h:3791: instantiated from ‘_Funct std::for_each(_IIter, _IIter, _Funct) [with _IIter = std::_Rb_tree_iterator<std::pair<const long unsigned int, DagdaCom::ServerSession*> >, _Funct = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<void (DagdaCom::Session::* const)(), const boost::_bi::bind_t<DagdaCom::ServerSession* const&, boost::_mfi::dm<DagdaCom::ServerSession*, std::pair<const long unsigned int, DagdaCom::ServerSession*> >, boost::_bi::list1<boost::arg<1> > >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >]’ /home/jkr/Programming/C++/Dagda/library/DagdaCom/Server.cpp:204: instantiated from here /usr/include/boost/lambda/detail/actions.hpp:87: error: no matching function for call to ‘boost::lambda::function_adaptor<void (DagdaCom::Session::*)()>::apply(void (DagdaCom::Session::* const&)(), const boost::_bi::bind_t<DagdaCom::ServerSession* const&, boost::_mfi::dm<DagdaCom::ServerSession*, std::pair<const long unsigned int, DagdaCom::ServerSession*> >, boost::_bi::list1<boost::arg<1> > >&)’ /usr/include/boost/lambda/detail/actions.hpp:87: error: return-statement with a value, in function returning 'void' make: *** [libdagdacom_la-Server.lo] Error 1 make: Target `all' not remade because of errors. TIA -- Groeten, Joost Kraaijeveld Askesis B.V. Molukkenstraat 14 6524NB Nijmegen tel: 024-3888063 / 06-51855277 fax: 024-3608416 web: www.askesis.nl

2 1

Bundled properties with boyer_myrvold_planarity_test
by Nick Wiggill 13 Dec '09

13 Dec '09

Can't seem to get this working. I'm not sure if there was something I missed in the docs, but as soon as I use bundled properties boyer_myrvold_planarity_test falls over. void SomeClass::create() { typedef adjacency_list<listS, listS, undirectedS, property <vertex_index_t, int>, property <edge_index_t, int> > Graph; typedef graph_traits<Graph>::vertex_descriptor Vertex; typedef graph_traits<Graph>::edge_descriptor Edge; typedef graph_traits<Graph>::vertex_iterator VertexIterator; BOOST_CONCEPT_ASSERT ((boost::concepts::VertexAndEdgeListGraph<Graph>)); BOOST_CONCEPT_ASSERT ((boost::concepts::IncidenceGraph<Graph>)); //Create graph const int NUM_VERTICES = 5; Graph graph(NUM_VERTICES); //Create vertices and edges Vertex u, v; u = vertex(0, graph); v = vertex(4, graph); //add_edge(u, v, graph); //BAD line! //Other attempted/failed way of adding edges //Edge e; //e = edge(u, v, graph); //Another attempt, doesn't seem to work with //bundled props, unsurprisingly. //add_edge(0, 4, graph); cout << "Vertex and edge additions complete." << endl; //iterate through vertices VertexIterator vItr, vItrEnd; for (tie(vItr, vItrEnd) = vertices(graph); vItr != vItrEnd; ++vItr) { cout << "#"<< endl; //<< graph[*vItr] << endl; } cout << "Vertex iteration complete." << endl; if (boyer_myrvold_planarity_test(graph)) cout << "Test claims graph is planar" << endl; else cout << "Test claims graph is non-planar" << endl; cout << "Planarity testing complete." << endl; } The line commented "BAD line!" causes an exit on calling boyer_myrvold_planarity_test. With the test commented out, the program will run to its normal completion. What am I failing to grasp? TIA -Nick

2 2

Unable to access graph concepts
by Nick Wiggill 13 Dec '09

13 Dec '09

Hi I'm new to Boost (using 1.41.0) and specifcally the BGL and am having a small problem with accessing graph concepts. My IDE (Eclipse/CDT) and compiler (GCC 3.4.5) are having trouble seeing definitions of graph concepts, although I have included boost/graph/graph_concepts.hpp. When I type the boost namespace specifier, autocomplete can find e.g. EqualityComparable, but it cannot find VertexAndEdgeListGraph (among others... but this the one I need). I can see the basic BCCL concepts from boost/concept_check.hpp just fine, making this all the more confusing. My paths are correct, as for example adjacency_list (residing in the same path) works fine. PS. Try to have mercy on me, I'm not only returning to C++ after a number of years but I'm also in the process of reacquainting myself fully with generic programming (and the STL), something I was never too great at... so a lot of things still meet with a blank stare from me. I've just been learning these things slowly by example and by trial-and-error so far. TIA, -- Nick Wiggill skype: nickwiggill nick.wiggill(a)gmail.com www.handcraftedgames.net -- "He uses statistics as a drunken man uses lamp-posts... for support rather than illumination." -Andrew Lang (1844-1912)

2 4

Asio io_service::work destructor throwing mutex exception
by Florian Turck 13 Dec '09

13 Dec '09

Hi, I am using asio´s io_service::work class to prevent io_service.run() from returning. Unfortunatly on deletion of my object the destructor of io_service::work throws an exception: terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >' what(): mutex: Invalid argument Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 libSystem.B.dylib 0x9578c732 __kill + 10 1 libSystem.B.dylib 0x9578c724 kill$UNIX2003 + 32 2 libSystem.B.dylib 0x9581f98d raise + 26 3 libSystem.B.dylib 0x95835a44 abort + 93 4 libstdc++.6.dylib 0x9122afda __gnu_cxx::__verbose_terminate_handler() + 433 5 libstdc++.6.dylib 0x9122917a __cxxabiv1::__terminate(void (*)()) + 10 6 libstdc++.6.dylib 0x9122851d __cxa_call_terminate + 53 7 libstdc++.6.dylib 0x9122909d __gxx_personality_v0 + 911 8 libSystem.B.dylib 0x9579aa9d unwind_phase2 + 205 9 libSystem.B.dylib 0x957b1fd9 _Unwind_Resume + 73 10 com.yourcompany.ReclaimR 0x00026ed3 boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex>::scoped_lock(boost::asio::detail::posix_mutex&) + 79 (scoped_lock.hpp:37) 11 com.yourcompany.ReclaimR 0x00027dfa boost::asio::detail::task_io_service<boost::asio::detail::kqueue_reactor<false> >::work_finished() + 28 (task_io_service.hpp:171) 12 com.yourcompany.ReclaimR 0x00027e72 boost::asio::io_service::work::~work() + 22 (io_service.ipp:155) The asio related objects are all members of my class: [...] private: io_service ioService; io_service::work ioWork; thread ioThread; tcp::socket controlSocket; tcp::acceptor acceptor; [...] This is how I initialize everything: [...] MyClass() : ioService(), ioWork(ioService), ioThread(bind(&io_service::run, &ioService)), controlSocket(ioService), acceptor(ioService), [...] Finally this is what happens in the destructor: [...] if (connected) disconnect(); ioService.stop(); ioThread.join(); [...] Anyone knows how to deal with this? Regards, Florian

2 1

can't build an official example on eclipse
by loveley 13 Dec '09

13 Dec '09

hello, I have an issue while trying to run boost for the first time. I downloaded boost on my mac snow leopard, with eclipse. I compiled the sources(with bjam, without options), and I added the "include" directory (ie boost_1_41_0/boost)and the "libs" one (ie boost_1_41_0/libs) in eclipse. the example I used is the one provided by the official tutorial : ****************************************************** #define BOOST_TEST_MODULE MyTest #include <boost/test/unit_test.hpp> int add( int i, int j ) { return i+j; } BOOST_AUTO_TEST_CASE( my_test ) { // seven ways to detect and report the same error: BOOST_CHECK( add( 2,2 ) == 4 ); // #1 continues on error BOOST_REQUIRE( add( 2,2 ) == 4 ); // #2 throws on error if( add( 2,2 ) != 4 ) BOOST_ERROR( "Ouch..." ); // #3 continues on error if( add( 2,2 ) != 4 ) BOOST_FAIL( "Ouch..." ); // #4 throws on error if( add( 2,2 ) != 4 ) throw "Ouch..."; // #5 throws on error BOOST_CHECK_MESSAGE( add( 2,2 ) == 4, // #6 continues on error "add(..) result: " << add( 2,2 ) ); BOOST_CHECK_EQUAL( add( 2,2 ), 4 ); // #7 continues on error } ****************************************************** and the error is: http://pastebin.com/m4c85af13 . can you help me? thank you, olivier. ****************************************************** ___________________________________________________________________________ Yahoo! Mail réinvente le mail ! Découvrez le nouveau Yahoo! Mail et son interface révolutionnaire. http://fr.mail.yahoo.com

4 11

[Serialization] Saving non-const values
by Patrick Moran 12 Dec '09

12 Dec '09

Hello all, I noticed in the documentation of Boost.Serialization in 1.41.0 that under the "Rationale" section the link for "Compile time trap when saving a non-const value" still appears at the top of the page, but the section it points to is now missing. Is this just an error in the documentation, or has this restriction been removed in 1.41.0. No such change is mentioned in the release notes, but I read somewhere a while ago that they were considering removing the saving-const restriction. In case it helps, the context I'm using this in is using Boost.Serialization to serialize polymorphic classes and polymorphic containers from Boost.PointerContainer. Thanks, Patrick Moran

2 1

boost port for S60 (Symbian)
by Yuriy Krasnoschek 12 Dec '09

12 Dec '09

Hello. I spent some efforts to make several libraries from boost compile and run on Symbian Series 60 with winscw (Code warrior by Nokia). I can share my work with community and continue porting, just need to know where to start. The problem is I was forced to modify original boost sources (like select_platform.hpp) and libraries files due to compiler / platfom limitations. Libraries that ran on S60 3rd Edition Feature Pack 2 + are: thread, date_time, system, regex, asio (partially) and of cource libraries that don't depend on platfom so much smart_pointers / type_traits / integer / etc. -- Best regards, Yuriy A. Krasnoschek aka D.Rider

3 4

Getting metadata of class
by Alex Vinokur 12 Dec '09

12 Dec '09

Hi, Does Boost contain any features to get metadata of classes? For instance, Let Foo be some class class Foo { int m_var1; long* m_var2] char m_var3[100]; dooble m_var4; }; I would like to get the following info (as vector, file, etc) of its members: {" m_var1", "int", sizeof (m_var1), offset of (m_var1) }, {" m_var2", "long", "Pointer", sizeof (m_var2), sizeof (base-variable, i.e., long), offset of (m_var2 }, {" m_var3, "char", "array", sizeof (m_var3), sizeof (base-variable, i.e., char), offset of (m_var3 }, {" m_var4", "double", sizeof (m_var4), offset of (m_var4) }, That info I would like to get as a result of some feature (function, ...) applied to class Foo, not to each member of Foo. Alex.

3 5

Re: [Boost-users] default mpi implementation
by Vladimir Prus 12 Dec '09

12 Dec '09

Sean Farrow wrote: > Hi: > > Could someone give me a url for the default mpi compiler used with > boost.mpi, I believe this is mpi++ but could be wrong. There's no default compiler -- a few will be probed. Specifically, this is what is probed on Unix: binaries named * mpic++ * mpiCC (supposedly used by MPICH) * mpicxx (supposedly used by OpenMPI and MPICH2) Does this help? - Volodya

2 1

My First Boost Program At Work With Visual Studio
by Dave Schwartz 12 Dec '09

12 Dec '09

Hello Gurus, First, my 2 lines of appreciation to the community. I am new to boost library and I must tell, I have been enjoying myself going through various boost libraries and running sample programs provided. Must say all this has been quite straightforward and given me a headstart and confidence in learning the libraries. I have been trying the samples on my home PC with Visual Studio 2008 with the libraries provided by boostpro 1.4 installation. No issues. Yesterday I tried using the serialization library at work and wanted to serialize a simple class to an XML file and de-serialize it. This example worked on my home PC (visual studio 2008). On my work PC that has visual studio 2005, the compilation went fine but the program ended up generating a library as in InventoryConfig.lib, instead of the regular InventoryConfig.exe. Apparently it looks like the output type of the program changed from .exe to .lib on visual studio 2005 on my work computer. When I remove the serialization code, the output type goes back to .exe I copied the same code back to my home pc and with visual studio 2008 I get the correct result and the output type remains an executable as set initially while creating the project. Can't seem to figure out what project properties are getting changed on VS2005 when I use the library. I am not sure where to look or how to go about fixing this issue. Appreciate your help. Thanks a lot Dece

2 1

condition_variable
by Alessandro Bellina 11 Dec '09

11 Dec '09

Hello, I am using boost condition_variables to block while waiting for an asynchronous response. I am seeing an error that happens at random whenever I am releasing the lock just before calling notify_one. The error goes away if I keep the lock and release after notify_one. Here is the code: class BlockingRequest{ public: // predicate class class ResponseStatus { public: ResponseStatus( bool& received ) : m_received( received ) { } bool operator()() const { return m_received; } private: bool& m_received; }; //blocking request std::string Request( const std::string& request ) { boost::mutex::scoped_lock lock( mutex ); //perform asynchronous request through network or something else, pass RequestHandler as a handler boost::posix_time::milliseconds timeoutDuration( 10000 ); //wait for 10 seconds if( !condition.timed_wait( lock, timeoutDuration, ResponseStatus( received ) ) ) { throw std::exception( "Request timed out" ); } return receivedMessage; } //some other thread calls this function void RequestHandler( const std::string& message, void* caller ) { BlockingRequest* myRequest = reinterpret_cast< BlockingRequest* >( caller ); boost::mutex::scoped_lock lock( myRequest->mutex ); myRequest->receivedMessage = message; myRequest->received = true; /* if this next line in bold is commented out, code works fine... contrary to Boost documentation. http://www.boost.org/doc/libs/1_41_0/doc/html/thread/synchronization.html#t… */ *lock.unlock();* myRequest->condition.notify_one(); } };

4 8

privately inherit enable_shared_from_this?
by Eric J. Holtman 11 Dec '09

11 Dec '09

I have some code that uses enable_shared_from_this. I was publicly deriving, i.e. (and this works) class Request : public boost::enable_shared_from_this<Request> { }; I wanted to change my code around so that I wrapped the shared_from_this function inside the class, so that I could check at runtime whether certain conditions hold, i.e. class Request : private boost::enable_shared_from_this<Request> { public: boost::shared_ptr<Request> get_ptr () { if (conditions_are_good) return shared_from this (); else throw std::logic_error ("Bad get"); }; }; This won't compile (visual studio 2008). 1>Compiling... 1>Request.cpp 1>c:\boost\boost_1_40_0\boost\smart_ptr\enable_shared_from_this.hpp(50) : error C2243: 'type cast' : conversion from 'Request *' to 'boost::enable_shared_from_this<T> *const ' exists, but is inaccessible 1> with 1> [ 1> T=Request 1> ] 1> c:\boost\boost_1_40_0\boost\smart_ptr\enable_shared_from_this.hpp(48) : while compiling class template member function 'boost::shared_ptr<T> boost::enable_shared_from_this<T>::shared_from_this(void)' 1> with 1> [ 1> T=Request 1> ] 1> c:\src\cpp\trunk\request_lib\request.h(48) : see reference to class template instantiation 'boost::enable_shared_from_this<T>' being compiled 1> with 1> [ 1> T=Request 1> ] Can I get this to work?

3 3

[integer]/cstdint.hpp How to use portable literals?
by vicente.botet 11 Dec '09

11 Dec '09

Hi, I need to use boost::intmax_t literals in a portable way. I remember some discussion related to this subject, but I've not found the thread. Could someone point me to these threads, or tell me how I can achieve this. I'm currently using the macro INTMAX_C, but it seems that this macro is not always defined. Thanks, _____________________ Vicente Juan Botet Escribá

9 17

Recognition simple variables, pointers and arrays
by Alex Vinokur 11 Dec '09

11 Dec '09

Hi, Is there any Boost method/class that enables to recognize simple variables, pointers, arrays in C++? Something like: http://groups.google.com/group/alt.sources/browse_thread/thread/8b059c1df87… Alex

2 2

[chrono] New Features + Bug fixes + Updated documentation
by vicente.botet 11 Dec '09

11 Dec '09

Hi, I'm pleased to annonce the new version of the Boost.Chrono library. Even if the library is not yet ready for review I wanted to share it with you. The library can be downloaded from the vault http://www.boostpro.com/vault/index.php?action=downloadfile&filename=chrono… and the documentation is online on the sandbox http://svn.boost.org/svn/boost/sandbox/chrono/libs/chrono/doc/html. For the moment I'm not able to test it on Windows and Mac platforms. Could you check if there are some regressions on Windows or on Mac platforms? Of course, any comments or suggestions are welcome. If there is a volontary review manager that can start inspecting the library s/he is also welcome :). This library is based on the Beman's boostified version of the probe of concept of Howard. Many thanks to Howard the originator of the library and to Beman to start the boostification. Next follows the contents of the library and the updates of the new version Version 0.1.0, April 29, 2009 Beman's boostified version Features: * The C++0x Standard Library's class common_type. * The C++0x Standard Library's compile-time rational arithmetic. * The C++0x Standard Library's time utilities, including: * Class template duration * Class template time_point * Clocks: * system_clock * monotonic_clock * high_resolution_clock * Class template timer, with typedefs: * system_timer * monotonic_timer * high_resolution_timer * Process clocks and timers: * process_clock, capturing real, user-CPU, and system-CPU times. * process_timer, capturing elapsed real, user-CPU, and system-CPU times. * run_timer, convenient reporting of process_timer results. Version 0.2.0, December 8, 2009 + New Features + Bug fixes + Updated documentation Features: * Added ratio construction and assignment from an equivalent ratio (LWG 1281. CopyConstruction and Assignment between ratios having the same normalized form) * Added nested ratio typedef type (LWG 1281. CopyConstruction and Assignment between ratios having the same normalized form) * Added BOOST_CHRONO_HAS_CLOCK_MONOTONIC macro to state if monotonic_clock is provided on a platform. * Added duration operator% (LWG 934. duration is missing operator%) * Complete duration operator* and operator/ Implementation: * Use INTMAC_C to name intmax_t constants instead of LL. * Separate chrono.cpp on # files win/chrono.cpp, mac/chrono.cpp and posix/chrono.cpp to make easier the maintenance on different platforms. * Separate process_clock.cpp on # files win/process_clock.cpp, mac/process_clock.cpp and posix/process_clock.cpp to make easir the maintenace on different platforms. * Added the error_code prototype for monotonic_clock::now for mac/chono.cpp * Fully implement mac/chrono.cpp with error handling. * Take care on POSIX systems when CLOCK_MONOTONIC is not defined. Documentation: * The documentation is written now using quick-book using as base "N2661 - A Foundation to Sleep On". Fixed Bugs * operator/ was ambiguous: Disambiguate duration operator/ * CLOCK_MONOTONIC is not defined with cygwin/gcc 3.4: Disable code when BOOST_CHRONO_HAS_CLOCK_MONOTONIC is not defined. * result of metafunctions ratio_multiply and ratio_divide were not normalized ratios: Use of the nested ratio typedef type on ratio arithmetic operations. * Copy constructor from similar duration masked the defaulted operations: Added duration defaulted implementations Note that the comon_type class should be integrated by Boost.TypeTraits, class ratio will be proposed as a standalone library Boost.Ratio, and the Timer and Process clock part could be proposed as an update of Boost.Timer. Best regards, _____________________ Vicente Juan Botet Escribá

2 2

multi-index/interprocess find key must be allocated in shared memory?
by Jerry Hicks 11 Dec '09

11 Dec '09

Hi, I have a multi_index set working nicely in shared memory but I'm trying to figure out how to search one of my indices without allocating the search key in shared memory. Assuming my index is based on a char_string (basic_string with a segment manager allocator), is there an easy way to perform a find() operation that can use a const char *key? Trying to avoid the rather substantial overhead of instantiating my const char *key as a char_string in shared memory. Any other suggestions how I might organize things to avoid the situation would be welcomed.. Cheers, Jerry Hicks

2 2

[BoostCon 2010] Submission deadline extended
by Hartmut Kaiser 11 Dec '09

11 Dec '09

In 2010 BoostCon celebrates its 4th anniversary in Aspen. You are invited to submit a paper or a session (see the original call for participation here: http://www.boostcon.com/community/wiki/show/Start/) for BoostCon 2010, Aspen on May 10 - May 14th, 2010. Please, see http://www.boostcon.com for more information. Important dates: Proposal submissions Extended to January 3, 2010 Proposals decisions sent January 25, 2010 (tentative program available) Fully scheduled program available February 10, 2010 Session materials due April 15, 2010 Hartmut Kaiser, email: hartmut.kaiser(a)gmail.com (Program Committee Chair) David Abrahams, email: dave(a)boostpro.com (Conference Chair) On behalf of the conference organizers

1 0

Re: [Boost-users] Simple serial port demonstration with boost asio asynchronous I/O
by philipp_muenzel＠web.de 11 Dec '09

11 Dec '09

Hello, in reply to this old posting: http://lists.boost.org/boost-users/2008/10/41140.php I would like to kindly ask the author Jeff Gray if he tested his example on a Mac. On Linux, the example works flawlessly and lets me communicate with both "native" serial port hardware and USB-to-serial converted hardware with FTDI chips, which can be adressed via /dev/ttyUSB. On a Power Mac with OS Tiger, using boost 1.40 and the gcc 4.0 compiler, everytime I start the example I get the following errors: $ ./minicom.app/Contents/MacOS/minicom 57600 /dev/cu.usbserial-4B11 Error: Operation not supported Press Enter to exit Error: Bad file descriptor Press Enter to exit However, I can talk to the serial-via-usb hardware using some native socket functions, so the file descriptor itself can't be the problem. How can I get the minicom example to work on Mac also? Regards, Philipp ___________________________________________________________ Preisknaller: WEB.DE DSL Flatrate für nur 16,99 Euro/mtl.! http://produkte.web.de/go/02/

1 0

Workaround for g++ problem compiling Boost.Asio examples on Ubuntu 8.04.3
by David Featherstone 11 Dec '09

11 Dec '09

I'm running Ubuntu 8.04.3 as a VMware virtual machine hosted by Windows XP on a Lenovo T61 laptop. Synaptic Package Manager [or apt-get] on Ubuntu 8.04.3 offers both the libboost-dev v1.34.1 and the libasio-dev v0.3.8 packages with pre-built libraries. Version 1.34 of Boost does not have an integrated asio library; asio integration appears in v1.35 and later versions of Boost. Source code for the problematic example program can be found here: http://www.boost.org/doc/libs/1_41_0/doc/html/boost_asio/tutorial/tuttimer4… Source listing for Timer.4 The first compile problem occurs at the second #include: #include <boost/asio.hpp> The compiler cannot find this header because asio.hpp was installed under /usr/include rather than under /usr/include/boost. I fixed this issue by creating a soft link to /usr/include/asio.hpp in /usr/include/boost: $ sudo ln -s ../asio.hpp /usr/include/boost/asio.hpp Solving the second compile problem proved more difficult. The second compile problem occurred at the first use of the boost::asio namespace: printer(boost::asio::io_service& io) Changing all occurrences of 'boost::asio' to simply 'asio' solves this problem, but makes tedium of playing with the examples and developing new code that will be compatible with v1.35+ of Boost. Instead, I employed namespace declarations to (artificially) nest the asio namespace within the boost namespace. This artificial nesting is straight-forward - a single line of code: #include <iostream> #include <boost/asio.hpp> #include <boost/bind.hpp> #include <boost/date_time/posix_time/posix_time.hpp> namespace boost { namespace asio { using namespace ::asio; } } class printer { public: printer(boost::asio::io_service& io) o o o Caution: I have not made exhaustive tests of this workaround, but it does compile [g++ 4.2.4] , link, and run on my platform: $ g++ -o timer timer.cpp -lboost_thread $ ./timer 0 1 2 3 4 Final count is 5 You may find more helpful information here, from the developer of the asio library: http://blog.think-async.com/ http://blog.think-async.com -- View this message in context: http://old.nabble.com/Workaround-for-g%2B%2B-problem-compiling-Boost.Asio-e… Sent from the Boost - Users mailing list archive at Nabble.com.

2 2

default mpi implementation
by Sean Farrow 11 Dec '09

11 Dec '09

Hi: Could someone give me a url for the default mpi compiler used with boost.mpi, I believe this is mpi++ but could be wrong. Any help appreciated. Sean.

1 0

Including only the needed boost headers.
by Al Gambardella 11 Dec '09

11 Dec '09

I am currently using the tokenizer library to do some simple log file processing. I am the only person on my team currently using the boost libraries. This code I wrote was originally just a utility for myself so I was able to get away with installing boost "only" on my PC. Now others on the team want to use my utility. Is there a way I can share this code with them without forcing them to install boost on there PCs? I am only using a very very small portion of the boost library so I think it would be overkill to make everyone install boost. Can I create a DLL or library to solve this? If this helps... I am running visual studio 2005. My project is not GUI based. Thanks

4 3

Re: [Boost-users] [ASIO] Wrong usage of streambuf ?
by Imran Fanaswala 11 Dec '09

11 Dec '09

> Date: Tue, 08 Dec 2009 15:03:46 +0100 > From: Axel <axel.boost(a)laposte.net> > To: boost-users(a)lists.boost.org > Subject: [Boost-users] [ASIO] Wrong usage of streambuf ? > Message-ID: <4B1E5CC2.6040103(a)laposte.net> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Hello > > I m writing a simple client/server program. On a request the server > answers "ok\r\n". It works well. I have a problem with the client. > Using async functions, I don't manage to handle the response from the > server. Once the server sent the response, I want to read the data, > close the socket, and open a new connection to the server. > > When I don't read the data sent by the server, I manage to close the > socket and repeat the operation (close the socket, and reconnect to the > server). > When I read the data, the program seems to block. > > /* Callback to the async_write function. On any request, the server > sends "ok\r_n" */ > void Client::handle_write(boost::asio::ip::tcp::socket* socket, const > boost::system::error_code& err) > { > if(!err) > { > cout << "Read..." << endl ; > // response_ is a boost::asio::streambuf variable > boost::asio::async_read_until(*socket, response_, "\r\n", > boost::bind(&Client::handle_read, this, socket, > boost::asio::placeholders::error, > boost::asio::placeholders::bytes_transferred)) ; > } > else > { > cout << "Error when writing to host: " << err.message() << "\n" ; > } > } > > void Client::handle_read(boost::asio::ip::tcp::socket* socket, const > boost::system::error_code& err, size_t bytes_transferred) > { > cout << bytes_transferred << " bytes received. " << endl ; > > /* Dont count the 2 bytes long "\r\n" string */ > int message_size = bytes_transferred - 2 ; > > > char * response_char = new char[message_size + 1] ; > response_char[message_size] = '\0' ; > response_stream.read(response_char, message_size) ; > string result(response_char) ; > delete response_char ; > response_.consume(2) ; > > socket->close() ; > delete socket ; > connect() ; > return ; > } > > If I skip the block where I read the response_ into a string, the > program works flawlessly. If I try to read the response from the > streambuf variable, the program is blocked at the next call to > async_read_until() */ > So I guess that I m doing something wrong with the streambuf variable > named "response_", but I dont understand what. Can someone explain me > what is wrong ? > > Thanks in advance. > I am not really sure what response_stream is, but I see what you are trying to do. Consider doing the following instead: void Client::handle_read(boost::asio::ip::tcp::socket* socket, const boost::system::error_code& err, size_t bytes_transferred) { ... //Note: data, will contain the "ok\r\n".. so just do some string manip to get rid of it const char* data=boost::asio::buffer_cast<const char*>(response_.data()); response_.consume(bytes_transferred); //This is the key... ... }

1 0

sending a serialized object using message_queue
by Luciano Afranllie 11 Dec '09

11 Dec '09

Hi, I am trying to send a serialized object using message_queue but I am getting a boost::interprocess_exception::library_error in the sender side. I think the problem is me but after a lot of google I could not find a way to make it work This is the method where I am trying to send the message: int RemoteMgr::sendMsgToPeers(const IPCMsg &msg) { std::cout << "RemoteMgr::sendMsgToPeers()\n"; std::ostringstream archive_stream; boost::archive::text_oarchive archive(archive_stream); archive << msg; std::string outbound_data = archive_stream.str(); std::vector<char> outbound(outbound_data.begin(), outbound_data.end()); std::cout << "outbound_data = [" << outbound_data << "]\n"; std::cout << "size = " << outbound.size() << "\n"; // TODO: Not working yet. How to send a string with serialized data? message_queue mq_master(open_only, "master_queue"); mq_master.send(&outbound, outbound.size(), 0); } Where IPCMsg is class IPCMsg { public: IPCMsg() {} IPCMsg(const std::string &type, const std::string &payload); ~IPCMsg(); std::string getSender() { return m_sender; } std::string getType() { return m_type; } std::string getPayload() { return m_payload; } template<class Archive> void serialize(Archive & ar, const unsigned int /* file_version */) { ar & BOOST_SERIALIZATION_NVP(m_sender) & BOOST_SERIALIZATION_NVP(m_type) & BOOST_SERIALIZATION_NVP(m_payload); } private: std::string m_sender; std::string m_type; std::string m_payload; }; Receiver code is like this: unsigned int priority; std::size_t recvd_size; IPCMsg msg; std::vector<char> inbound_data(100); std::cout << "Waiting for peers" << std::endl; while (!terminate) { if (mq.try_receive(&inbound_data, inbound_data.size(), recvd_size, priority)) { std::cout << "New message received.\n"; std::string archive_data(&inbound_data[0], inbound_data.size()); std::istringstream archive_stream(archive_data); boost::archive::text_iarchive archive(archive_stream); archive >> msg; std::cout << "msg type = " << msg.getType() << "\n"; } } Hope you can help. Thanks! Luciano

1 0

[ASIO] Wrong usage of streambuf ?
by Axel 11 Dec '09

11 Dec '09

Hello I m writing a simple client/server program. On a request the server answers "ok\r\n". It works well. I have a problem with the client. Using async functions, I don't manage to handle the response from the server. Once the server sent the response, I want to read the data, close the socket, and open a new connection to the server. When I don't read the data sent by the server, I manage to close the socket and repeat the operation (close the socket, and reconnect to the server). When I read the data, the program seems to block. /* Callback to the async_write function. On any request, the server sends "ok\r_n" */ void Client::handle_write(boost::asio::ip::tcp::socket* socket, const boost::system::error_code& err) { if(!err) { cout << "Read..." << endl ; // response_ is a boost::asio::streambuf variable boost::asio::async_read_until(*socket, response_, "\r\n", boost::bind(&Client::handle_read, this, socket, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)) ; } else { cout << "Error when writing to host: " << err.message() << "\n" ; } } void Client::handle_read(boost::asio::ip::tcp::socket* socket, const boost::system::error_code& err, size_t bytes_transferred) { cout << bytes_transferred << " bytes received. " << endl ; /* Dont count the 2 bytes long "\r\n" string */ int message_size = bytes_transferred - 2 ; char * response_char = new char[message_size + 1] ; response_char[message_size] = '\0' ; response_stream.read(response_char, message_size) ; string result(response_char) ; delete response_char ; response_.consume(2) ; socket->close() ; delete socket ; connect() ; return ; } If I skip the block where I read the response_ into a string, the program works flawlessly. If I try to read the response from the streambuf variable, the program is blocked at the next call to async_read_until() */ So I guess that I m doing something wrong with the streambuf variable named "response_", but I dont understand what. Can someone explain me what is wrong ? Thanks in advance.

5 8

[LibrariesUnderConstruction] Please update Boost.Coroutines entry
by Nat Goodspeed 11 Dec '09

11 Dec '09

Links: Boost Vault: http://www.boostpro.com/vault/index.php?action=downloadfile&filename=boost-… Last upload: 2009 Dec 01 Thank you!

2 2

ASIO: udp datagrams question
by Jay Sprenkle 10 Dec '09

10 Dec '09

When using asio with an async udp connection can I assume I will always receive a complete datagram or nothing at all? If packets are lost I will get nothing. If I get a data read callback I can assume the entire datagram has been received and assembled (even if it consisted of multiple packets)? Some of the underlying assumptions aren't clear from the documentation. Thanks! -- Cause united breaks guitars http://www.youtube.com/watch?v=5YGc4zOqozo

1 0

program_options: main and other translation units
by Hicham Mouline 10 Dec '09

10 Dec '09

Hello, I have a main.cpp translation unit with the main(int argc, char* argv[]) function. My application runs in 1 of 4 modes. The mode is selected by the command line options, something like --mode1 --mode2 --mode3 --mode4 In main(), I have defined a mode_options instance of options_description, added these modes to it and defined the variables_map 'vm' that will be passed around to functions (1 for each mode) that reside in other translation units. I then get to a try/catch block, where: I store( command_line_parser(argc, argv).options(mode_options).run(), vm ); notify(vm); I have a sanity check that only 1 and at least 1 of the 4 modes is selected. I then call the function relevant to the mode selected, and pass to it 'vm'. In each of these other functions, I have other instances of options_description, reuse the same 'vm' and store again in vm the parsing ran on the appropriate options_description instance. Each mode option has specific suboptions. Question 1: I want the help option to print usage for all modes and all suboptions if no mode is selected. I want the help option to print usage for just 1 mode if a mode is selected. Question 2: I still want to program_options to throw if an unrecognized option is input, however, I throw my own exceptions if an option for mode_i is set with --mode_j for e.g. Question 3: I may eventually move to a GUI (probably c#-based) for passing options. Is there any particular advice to isolate the machinery of program_options from the functional part of my application. A big thanks to the library developer(s) and to the mailing list contributors for all the useful answers. Best regards, H

2 1

mpl: POD decoration with constructors and getters/setters
by Hicham Mouline 10 Dec '09

10 Dec '09

Hello, I posted a question to comp.lang.c++ first and now realize this maybe a mpl or PP question as well. Here is the original question: > Hicham Mouline wrote: >> I have functions that each take 1 parameter. This parameter is of type >> >> struct S { >> <arithmetic_or_bool_type_1> member_name_1; >> <arithmetic_or_bool_type_n> member_name_n; >> }; // n can be of order 10 or so >> >> class C { >> public: >> return_type apply( const S& ) const; >> }; >> >> Now I want to optimize the returned value. > > "Optimize"? > >> I would optimize by fixing any subset of the n members fixed, ie none at >> all, or just member 5, or members 4 and 8, or members 7,3 and n, or n-1 >> members of the {1....n} set. >> >> How can I do this? >> >> maybe >> >> class C{ >> public: >> pair<return_type, S> optimize(...) const; // returns the optimum S >> that gives the best return value > > What's "return_type" here? What does it mean for the return value to be > "the best"? > >> }; >> >> Some interface like this looks nice to me (as a user). >> >> The question is how to pass the fixed members to optimize. A response came as: > If your 'return_type' has to be the same *type*, there is no better > solution than to return an 'S', if the members that you don't want to > "return" are set to some "invalid" value. As an alternative you could > consider supplying another member to 'S', which would indicate the "valid" > or "active" members. You can have another (nested) struct in 'S' with bit > fields: > > struct S { > ... // as you have now > struct { > unsigned use_1:1; > unsigned use_2:1; > ... > unsigned use_n:1; > } which_members_to_use; > }; > My intial email not being clear, further clarifications are here: return_type is just double. C c; S s1; c.apply( s1 ); //// returns double , say 15.0 By optimize, I mean in most cases maximize, but sometimes minimize. So I'm trying to get the largest double by changing parts or all of s1. I was thinking of some metaprogramming magic that would generate automatically S constructors with arguments all the possible subsets of the member fields, and depending on the ctor selected by the user, would set those bits in the nested struct appropriately. This could generate also getters/setters that the optimize function could use. This could be a metafunction that returns a type SS based on the type S. I realize this is definitely a question for boost as well. The C::optimize function would then return the "optimal" S, along with the maximum/minimum double found. The details and meaning of the optimization would be specific to C::optimize. Best regards,

1 0

Boost Unit Testing Macros on Visual Studio 2005/Visual C++ 8.0
by Andrew Leer 10 Dec '09

10 Dec '09

I'm reading this article (http://www.ibm.com/developerworks/aix/library/au-ctools1_boost/?S_TACT=105A…) on the Boost Unit Testing Framework. However I'm having a bit of trouble with the first example, my guess is that they left something out (something that would be obvious to hardcore C++ coders) as IBM often does in their articles. Another possibility is that my Visual Studio 2005 C++ compiler is just too old for the example. #define _MYSTRING #define BOOST_TEST_MODULE stringtest #include <boost/test/unit_test.hpp> #include "stdafx.h" //#include "mystring.h" BOOST_AUTO_TEST_SUITE (stringtest) // name of the test suite is stringtest BOOST_AUTO_TEST_CASE (test1) { /* mystring s; BOOST_CHECK(s.size() == 0); */ BOOST_CHECK(0 == 0); } BOOST_AUTO_TEST_CASE(test2) { /* mystring s; s.setbuffer("hello world"); BOOST_REQUIRE_EQUAL('h', s[0]); // basic test */ BOOST_CHECK(0 == 0); } BOOST_AUTO_TEST_SUITE_END( ) To me the BOOST_AUTO_TEST_SUITE and BOOST_AUTO_TEST_CASE lines look a little suspect (especially since they don't have quotes around the arguments, and they are undeclared identifiers...but this probably means they are macros and I'm not certain I understand the concept or if that is available in VC++ 8.0)... Is there any reason why this code won't work? Bellow are the errors I'm receiving: 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(7) : error C2065: 'stringtest' : undeclared identifier 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(9) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(9) : error C2146: syntax error : missing ';' before identifier 'BOOST_AUTO_TEST_CASE' 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(9) : error C2065: 'test1' : undeclared identifier 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(10) : error C2448: 'BOOST_AUTO_TEST_CASE' : function-style initializer appears to be a function definition 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(18) : error C2065: 'test2' : undeclared identifier 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(19) : error C2448: 'BOOST_AUTO_TEST_CASE' : function-style initializer appears to be a function definition 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(29) : fatal error C1004: unexpected end-of-file found

5 13

socket type?
by pedro chaparro 10 Dec '09

10 Dec '09

hi, i wanna to pass the same socket decriptor among differents functions, that way all work over the same socket, but i'm no sure what kinf o data is a socket descriptor? what kind o data must retunr my function? thanks ? getsocket() { } -- Ing Pedro Alonso Chaparro Valero Ciudad Politecnica de la Innovación iTEAM - Mobile Communications Group Polytechnic University of Valencia C\ Camino de Vera S/N, Edificio 8G 46022 Valencia, Spain

2 1

[interprocess] mapped_region::flush()
by Stefan Strasser 10 Dec '09

10 Dec '09

Hi, I have a few questions regarding mapped_region. 1. first of all, is mapped_region::flush() safe to use? on linux it is implemented as msync(MS_SYNC) which seems fine, but on windows it uses FlushViewOfFile alone, which IIUC does not flush the changes to disk. MSDN: "The FlushViewOfFile function [...] does not wait to return until the changes are flushed from the underlying hardware disk cache and physically written to disk. To flush all the dirty pages plus the metadata for the file and ensure that they are physically written to disk, call FlushViewOfFile and then call the FlushFileBuffers function." I'm not sure if they really mean "hardware disk cache", since no sync or flush function can entirely make sure of that. but FlushFileBuffers is documented to flush operating system buffers. and the quote above says a call to FlushFileBuffers is necessary. 2. can the mapped memory be accessed while another thread is calling flush()? does that affect the flushing? it is still required that all data that was written to the mapped region at the point of the flush() call is written to disk when it returns. Interprocess' documentation doesn't say anything about that and I can't seem to find any information about that on the underlying functions mmap/FlushViewOfFile either. and 3, not entirely boost related: I get some strange performance results using mapped_region::flush() on linux (not tested on windows so far). I already reduced the flush() calls to a minimum but I still get better performance in many cases using my own filebuf implementation that performs paging without hardware support, using a std::filebuf. using std::filebuf shouldn't be faster than hardware file mapping. when I call flush() relatively frequently that in itself drives performance down, but when I call it less frequently it blocks for noticeable amounts of time. (thus, question 2) do the offset/size arguments to mapped_region::flush() affect performance? I could track what pages are changed, but I was under the assumption the OS already does that. Thanks

2 2

Runtime error with Boost's unit test framework
by Joey Mink 10 Dec '09

10 Dec '09

Hi all, I'm a newbie using the boost unit test framework. I'm getting a run-time exception that presents itself with the following message: Unhandled exception at 0x61c3b130 (msvcr80d.dll) in test.exe: 0xC0000005: Access violation reading location 0xcccccccc. If I step through the code, the exception is thrown the 3rd time this line from Boost is invoked: unit_test_suite_impl.hpp:111 callback0<> const& test_func() const { return m_test_func; } I can't seem to uncover what the problem is - has anyone else had this problem? Might anyone have any insight to my possible misuse of it? I'm linking with libboost_program_options-vc80-mt-gd-1_41.lib. Running Visual Studio 2005 (VC8) Thanks! Joey

4 3

boost::lambda questions
by Peter Foelsche 09 Dec '09

09 Dec '09

I would like to be able to: * return multiple results from a lambda function * use temporary variables inside a lambda function, declared using BOOST_AUTO * I would need the ability to deduce the type of the returned values via BOOST_AUTO to declare the matching variables. I think I could use boost::tuple for this: const BOOST_AUTO(sTupleVar, someThing); const BOOST_AUTO(sFirstResult, get<0>(sTupleVar)); const BOOST_AUTO(sSecond, get<1>(sTupleVar)); But how to declare a local variable inside a lambda function? Peter

2 1

Re: [Boost-users] Problem using Boost regex
by John Emmas 09 Dec '09

09 Dec '09

[Addendum...] Following my original post, firstly, apologies - I should have mentioned that I'm trying to build the regex example using Visual Studio 8 Express Edition (i.e. VC++2005). Also, I've got some more information.... Apart from those libs that I mentioned in my original post, I've found a whole bunch of libs beginning with "libboost-regex-vc80-" and ending with these suffixes:- mt-1_40.lib mt-gd-1_40.lib mt-s-1_40.lib mt-sgd-1_40.lib s-1_40.lib I guess these must be the static link libs. Anyway, I've discovered that if I link to any lib that ends in "mt-1_40.lib" I can build my app and launch it successfully as long as I build in Release mode. But in Debug mode, the app either doesn't launch - or if it does launch, it gives the unhandled exception that I described earlier. Hope that helps, John

4 19

ASIO async I/O with iostream?
by Jay Sprenkle 09 Dec '09

09 Dec '09

Good afternoon all, I'm interested in writing a program using asio. I'm new to both boost and asio. Is it possible to use async I/O with streams? A stream is a good method for what I'm interested in doing but I don't see how to make it work. What I've got so far: A class using event driven async I/O. The class parses the data into variable arbitrary sized messages. I read from the tcp socket into a buffer, then create a stream from the buffer, then deserialize the data from the stream. unsigned char buffer[1024]; // connect receive event socket->async_read_some( boost::asio::buffer(buffer), boost::bind( &TcpConnection::receive, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred ) ); I'd like to be able to skip the buffer and just read directly to the stream with an event to notify me of the arrival of data. Thanks! -- Cause united breaks guitars http://www.youtube.com/watch?v=5YGc4zOqozo

2 3

Bug in mingw with gcc 4.3.0: boost_concept_check.h
by Eloi Du Bois 09 Dec '09

09 Dec '09

Hi all, I found a probable bug in mingw. Here is the minimal code that can not compile: #include <boost/ptr_container/ptr_list.hpp> > > #include <iostream> > > class A > { > public: > A(const int id):_id(id){} > virtual ~A()=0; > bool operator==(const A& other) const { return _id == other._id; } > int _id; > }; > > A::~A(){} > > class B : public A > { > public: > B(const int id):A(id){} > virtual ~B() {} > }; > > class C : public A > { > public: > C(const int id):A(id){} > virtual ~C() {} > }; > > int main() { > typedef boost::ptr_list<A> AList; > AList a,b; > a.push_back( new B(0) ); > a.push_back( new C(1) ); > b.push_back( new B(0) ); > b.push_back( new C(1) ); > > return a == b; > } > And the compilation error: gcc.compile.c++ > T:\Analyse1\dist\lib\bin\gcc-mingw-4.3.0\debug\threading-multi\src\main.o > c:\qt\mingw\bin\../lib/gcc/mingw32/4.3.0/include/c++/bits/boost_concept_check.h: > In instantiation of '__gnu_cxx::_EqualOpConcept<A, A>': > c:\qt\mingw\bin\../lib/gcc/mingw32/4.3.0/include/c++/bits/boost_concept_check.h:62: > instantiated from 'void __gnu_cxx::__function_requires() [with _Concept = > __gnu_cxx::_EqualOpCon > cept<A, A>]' > c:\qt\mingw\bin\../lib/gcc/mingw32/4.3.0/include/c++/bits/stl_algobase.h:943: > instantiated from 'bool std::equal(_II1, _II1, _II2) [with _II1 = > boost::void_ptr_iterator<std::_List_ > const_iterator<void*>, const A>, _II2 = > boost::void_ptr_iterator<std::_List_const_iterator<void*>, const A>]' > T:\Analyse1\3rdParty\boost/boost/ptr_container/detail/reversible_ptr_container.hpp:531: > instantiated from 'bool > boost::ptr_container_detail::reversible_ptr_container<Config, CloneA > llocator>::operator==(const > boost::ptr_container_detail::reversible_ptr_container<Config, > CloneAllocator>&) const [with Config = > boost::ptr_container_detail::sequence_config<A, std:: > list<void*, std::allocator<void*> > >, CloneAllocator = > boost::heap_clone_allocator]' > tests\src\main.cpp:38: instantiated from here > c:\qt\mingw\bin\../lib/gcc/mingw32/4.3.0/include/c++/bits/boost_concept_check.h:296: > error: cannot declare field '__gnu_cxx::_EqualOpConcept<A, A>::__a' to be of > abstract type 'A' > tests\src\main.cpp:6: note: because the following virtual functions are > pure within 'A': > tests\src\main.cpp:14: note: virtual A::~A() > c:\qt\mingw\bin\../lib/gcc/mingw32/4.3.0/include/c++/bits/boost_concept_check.h:296: > error: cannot declare field '__gnu_cxx::_EqualOpConcept<A, A>::__b' to be of > abstract type 'A' > tests\src\main.cpp:6: note: since type 'A' has pure virtual functions > > "g++" -ftemplate-depth-128 -O0 -fno-inline -Wall -g -mthreads > -DBOOST_SYSTEM_DYN_LINK=1 -I"T:\Analyse1\3rdParty\boost" -I"tests\src" -c > -o "T:\Analyse1\dist\lib\bin\gcc-mingw- > 4.3.0\debug\threading-multi\src\main.o" "tests\src\main.cpp" > The problem might come from this: #define _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(_OP,_NAME) \ template <class _Ret, class _First, class _Second> \ struct _NAME { \ void __constraints() { (void)__constraints_(); } \ _Ret __constraints_() { \ return __a _OP __b; \ } \ _First __a; \ _Second __b; \ } I hope it comes from me and not from boost... If anyone have an idea of what I can do to solve this, It would be great :) Regards, Eloi.

1 0

Problem building boost on Windows
by Nathan Ridge 09 Dec '09

09 Dec '09

Hello, I'm having some trouble building the Boost libraries on Windows. - My OS is Windows Vista SP2 - My compiler in MinGW g++ 4.4. The folder containing the g++ executable is in my PATH environment variable. This is what I've done: - Downloaded the latest version (1.41) of the Boost libraries from www.boost.org and extracted it to C:\Dev\Libraries\boost (so e.g. C:\Dev\Libraries\boost\libs is a subfolder) - Downloaded the latest version (3.1.17) of Boost Jam from http://sourceforge.net/projects/boost/files/boost-jam and extracted bjam.exe into C:\Dev\Libraries\boost - Opened up a command prompt, cd'd into C:\Dev\Libraries\boost - Ran the command "bjam --with-filesystem variant=release link=static threading=single toolset=gcc" The output, up to the first error, is the following: == START BJAM OUTPUT == WARNING: No python installation configured and autoconfiguration failed. See http://www.boost.org/libs/python/doc/building.html for configuration instructions or pass --without-python to suppress this message and silently skip all Boost.Python targets Building the Boost C++ Libraries. After the build, the headers will be located at C:\Dev\Libraries\boost The libraries will be located at C:\Dev\Libraries\boost\stage\lib Use 'bjam install --prefix=<path>' if you wish to install headers and libraries to a different location and remove the source tree. ...patience... ...found 441 targets... ...updating 27 targets... common.mkdir stage common.mkdir stage\lib common.mkdir bin.v2 common.mkdir bin.v2\libs common.mkdir bin.v2\libs\system common.mkdir bin.v2\libs\system\build common.mkdir bin.v2\libs\system\build\gcc-mingw-4.4.0 common.mkdir bin.v2\libs\system\build\gcc-mingw-4.4.0\release common.mkdir bin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static gcc.compile.c++ bin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static\error_code.o g++: libs\system\src\error_code.cpp: No such file or directory g++: no input files "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -DBOOST_ALL_NO_LIB=1 -DBOO ST_SYSTEM_STATIC_LINK=1 -DNDEBUG -I"." -c -o "bin.v2\libs\system\build\gcc-mingw-4.4.0\release\link -static\error_code.o" "libs\system\src\error_code.cpp" ...failed gcc.compile.c++ bin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static\error_code.o. .. ...skipped <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>libboost_system-mgw44-1_41 .lib(clean) for lack of <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>error_code.o. .. ...skipped <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>libboost_system-mgw44-1_41 .lib for lack of <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>error_code.o... ...skipped <pstage\lib>libboost_system-mgw44-1_41.lib for lack of <pbin.v2\libs\system\build\gcc-min gw-4.4.0\release\link-static>libboost_system-mgw44-1_41.lib... [more similar errors] == END BJAM OUTPUT == So for some reason, it cannot find libs\system\src\error_code.cpp, which is actually located at C:\Dev\Libraries\boost\libs\system\src\error_code.cpp. Am I supposed to somehow specify the exact path where it should be looking? I tried adding the option --build-dir=C:\Dev\Libraries\boost, but I still get the same error. One suspicious thing that I noticed is that without the --build-dir option, the bin.v2 folder that is created is C:\Dev\bin.v2, as opposed to C:\Dev\Libraries\boost\bin.v2 or something like that. Not sure if this is related to my problem or not. What am I doing wrong? Thanks, Nate. _________________________________________________________________ Windows Live: Keep your friends up to date with what you do online. http://go.microsoft.com/?linkid=9691815

3 5

how to delete references to objects from a container...
by rv_nath 09 Dec '09

09 Dec '09

Hi forum members, I want to use boost's shared_ptr class for the connection pool class that i am writing. However, i have a requirement to delete the connection object (which is going to be the shared-ptr) explicitly based on certain checks like validity and expiry etc. If I store the shared_ptr, I want to know how to delete this explicitly from the stl container. According to my understanding shared_ptrs cannot be 'delete'd. So, how to achieve this...? Thanx in advance and regards, RV -- View this message in context: http://old.nabble.com/how-to-delete-references-to-objects-from-a-container.… Sent from the Boost - Users mailing list archive at Nabble.com.

4 6

How do I copy files and folders using boost and Visual Studio 2005?
by leeand00 09 Dec '09

09 Dec '09

I'm trying to use boost::filesystem to copy files and folders (just like a standard copy a folder and paste it in windows explorer). Although I've been to the boost::filesystem documentation, I still don't really know how to go about doing this. Do you have to recursively go though each directory (creating it) and find each file copying it? Additionally, how do you copy the file in C++/Boost? P.S. I'm using Boost 1.40.0 Update I think I may have ended up creating an answer to this one, only concern being that I don't do any try-catch errors to check for locked files and folders. The following code makes a copy of a directory in the relative path "../example/ecomm" and duplicates it to a non-existing path "../example/dup_ecomm": #include <boost/test/unit_test.hpp> #include <boost/algorithm/string.hpp> #include <boost/filesystem/operations.hpp> #include <boost/regex.hpp> #include <iostream> #include <fstream> #include<string> bool copy_dir( const boost::filesystem::path & ext_dir_path, // the existing directory const boost::filesystem::path & duplicate_dir_path // the duplicate directory ) { std::cout << "BEGIN: copy_dir " << endl; std::cout << "- ext_dir_path: " << ext_dir_path << endl; std::cout << "- duplicate_dir_path: " << duplicate_dir_path << endl; // 1. Ensure that the directory we are trying to copy exists. if (!boost::filesystem::exists( ext_dir_path ) ) return false; bool createdDir = boost::filesystem::create_directory( duplicate_dir_path ); // cout << "createdDir: " << createdDir << endl; copy_dir(ext_dir_path, // the existing directory duplicate_dir_path, // the duplicate directory, ext_dir_path, // the base path for the existing directory duplicate_dir_path, true); std::cout << "END: copy_dir " << endl; } bool copy_dir( const boost::filesystem::path & ext_dir_path, // the existing directory const boost::filesystem::path & duplicate_dir_path, // the duplicate directory, const boost::filesystem::path & base_ext_dir_path, // the base path for the existing directory const boost::filesystem::path & base_duplicate_dir_path, // the base path for the duplicate of the exisiting directory bool isRootPath) { // Debug input arguments std::cout << "BEGIN: copy_dir " << endl; std::cout << "- ext_dir_path: " << ext_dir_path << endl; std::cout << "- duplicate_dir_path: " << duplicate_dir_path << endl; std::cout << "- base_ext_dir_path: " << base_ext_dir_path << endl; std::cout << "- base_duplicate_dir_path: " << base_duplicate_dir_path << endl; std::cout << "- isRootPath: " << isRootPath << endl; boost::filesystem::directory_iterator end_itr; // default construction yields past-the-end cout << "--Beginning itr loop" << endl; for ( boost::filesystem::directory_iterator itr( ext_dir_path ); itr != end_itr; ++itr ) { if ( boost::filesystem::is_directory(itr->status()) ) { cout << "---itr->path(): " << itr->path() << endl; boost::filesystem::path newExtDir(itr->path()); string dup_path = itr->path().string(); boost::algorithm::replace_first(dup_path, base_ext_dir_path.string(), base_duplicate_dir_path.string()); cout << "dup_path: " << dup_path << endl; boost::filesystem::path new_dup_dir(dup_path); bool createdDir = boost::filesystem::create_directory( new_dup_dir ); cout << "creating directory " << dup_path << " created: " << createdDir << endl; boost::filesystem::path newDuplicateDir(duplicate_dir_path); copy_dir(newExtDir, // the existing directory newDuplicateDir, // the duplicate directory, base_ext_dir_path, base_duplicate_dir_path, false); } else { cout << "---isLeaf: " << itr->path() << endl; string dup_path = itr->path().string(); boost::algorithm::replace_first(dup_path, base_ext_dir_path.string(), base_duplicate_dir_path.string()); string src_path = itr->path().string(); cout << "src_path: " << src_path << endl; cout << "dup_path: " << dup_path << endl; boost::filesystem::path s_path(src_path); boost::filesystem::path d_path(dup_path); boost::filesystem::copy_file(s_path, d_path); } } std::cout << "--Ending itr loop" << endl; std::cout << "END: copy_dir " << endl; return false; } test_suite* init_unit_test_suite( int, char* [] ) { boost::filesystem::path ext_dir("..\\example\\ecomm"); boost::filesystem::path dir_dup("..\\example\\dup_ecomm"); copy_dir(ext_dir, dir_dup); // the duplicate directory, // ... unit tests...etc... } My question now is what I'm I forgetting to do in regards to locked files and directories? Additionally this same question has been posted over at http://stackoverflow.com/questions/1853812/how-do-i-copy-files-and-folders-… so that the rest of the programmer community may learn about boost. (You're welcome to answer there if you like). Thank you, Andrew J. Leer ----- Thank you,    Andrew J. Leer - http://leeand00.tiddlyspot.com/ My Blog -- View this message in context: http://old.nabble.com/How-do-I-copy-files-and-folders-using-boost-and-Visua… Sent from the Boost - Users mailing list archive at Nabble.com.

1 0

[Bind] How to create a functor which returns one of its arguments?
by Vadim Guchenko 09 Dec '09

09 Dec '09

Hello, All! Is there a simple way to create a functor that returns one of its arguments _1, _2, ...? Does standard unary functor exist, which simply returns its argument unchanged? I.e.: template<typename T> struct arg: public std::unary_function<T, T> { T operator()(const T &x) const { return x; } }; Then I could write: boost::bind(arg<int>(), _2) to create a functor which returns the value of its second argument, or boost::bind(arg<bool>(), true) to create a functor which always returns true. -- Best regards, Vadim Guchenko [yhw at relost dot net].

5 5

[Regex] Compile error in char_regex_traits.hpp with gcc 3.3.1
by Olexandr Marchenko 09 Dec '09

09 Dec '09

Hi, All I've got a compile error(please see below) while trying to compile my simple program with gcc 3.3.1 and boost 1.41.0. The strange thing is that I was able to compile the program before, but got the error after I had moved the line "include <boost/regex.hpp>" from .cpp file to .h file. At least that's what I think, maybe I've changed something I don't remember about. Anyway, it looks like I have the error even before my code starts compiling. I don't understand the error message at all. Where is this "__attribute__"? I tried to google it but found nothing. I would appreciate any help The error: In file included from d:/pnw/06072009/build/incsys/boost/regex/v4/regex.hpp:55, from d:/pnw/06072009/build/incsys/boost/regex.hpp:31, from d:/pnw/06072009/be/csvrdeng/csvcursor.h:1, from csvcursor.cpp:2: d:/pnw/06072009/build/incsys/boost/regex/v4/char_regex_traits.hpp:36: error: syntax error before `__attribute__' d:/pnw/06072009/build/incsys/boost/regex/v4/char_regex_traits.hpp:44: error: `char_regex_traits_i' is not a template d:/pnw/06072009/build/incsys/boost/regex/v4/char_regex_traits.hpp:47: confused by earlier errors, bailing out char_regex_traits.hpp(with unnecessary defines and comments omitted): namespace boost{ namespace deprecated{ //line 36 template <class charT> class char_regex_traits_i : public regex_traits<charT> {}; template<> class char_regex_traits_i<char> : public regex_traits<char> // line 44 { public: typedef char char_type; //line 47 typedef unsigned char uchar_type; typedef unsigned int size_type; typedef regex_traits<char> base_type; }; } // namespace deprecated } // namespace boost -- Regards, Alexandr

2 1

[Serialization] How to serialize third party library function
by elizabeta petreska 09 Dec '09

09 Dec '09

Hello First all, sorry for my long post, and I hope I will be clear with the question. In my project I have a lot of classes, which I plan to serialize with boost serialization library. Most of my classes have as members third party library classes. The thing is that the third party library classes are very complex and I can't serialize them directly in the standard way i.e I can't say this : template<class Arhive,class MyThirdPartyClass> void serialize(Archive& ar, MyThirdPartyClass& t, const unsigned int version) { ar & t.meber1; ar & t.member2; .... } MyThirdparty library classes all provide their own method for serialization ( storing in custom archive and reading from the archive), so I was thinking to do this : namespace boost { namespace serialization { template<class Archive> inline void save(Archive & ar, const CustomClass& t, const unsigned int version) { /// save t to the custom archive here . } template<class Archive> inline void load(Archive & ar, CustomClass& t, const unsigned int version) { ////// read data from archive and assign to t } } } Now when I do the following : // save data CustomClass* cc=new CustomClass(.....); outarchive & cc; /// later on read CustomClass * rcc=0; inarchive & rcc; delete rcc; /// (*) crash here. delete is operator implemented in my CustomClass I notice that the crash maybe has to do something with that, that my CustomClass implements its own new and delete operators. I know that the default implementation of load_construct data uses operator placement ::new ( global new operator ) to allocate object when loading through pointer, and I am deleting the object above ( * ) with its specific class delete operator. To avoid the mismatch I did this : template<class Archive> inline void load_construct_data(Archive & ar, CustomClass * t, const unsigned int file_version) { new (t) CustomClass; // notice that this is the custom class operator , not :: new } In my suprise (*) is still crashing. Why ? Also I notice that if in load_construct data I am using the global new operator, and when deleting the global ::delete ( i.e :: delete rcc) operator there is no problem at all. But this is not solution, cause I want my CustomClass to use their own specific operators new and delete.

5 10

[multi_index and flyweight]
by Samuel Charron 09 Dec '09

09 Dec '09

Hi, I'm currently facing some limitations from flyweight and multi_index. Let's begin with multi_index: I'd want to have a multi_index storing containers, and have one index based on all the contained elements. For example: two vectors [1 2 3] and [3 4] would be indexed as 1 -> [1 2 3] 2 -> [1 2 3] 3 -> [1 2 3] [3 4] 4 -> [3 4] How would you do that ? Flyweight: I'd like to have a scoped flyweight, without tracking, i.e.: { ... // create some elements } // All elements are deleted when leaving the scope. However, currently I didn't see a method to clear the internal container. One way I could do that would be copying - pasting the hashed_factory and adding a clear method. It would be easier to extend the class, just having the private container be protected. Would that be possible to do one a future release ? Or is there another easy way to do so ? Regards, Samuel

4 5

Re: [Boost-users] [chrono] New Features + Bug fixes + Updated + documentation
by Tan, Tom (Shanghai) 09 Dec '09

09 Dec '09

I have some more results regarding Windows platform to report. I tried with GCC-4.4.0 that's shipped with QT4.6 SDK on the same Win XP sp3 and received some different errors/warnings as pasted below: gcc.compile.c++ bin.v2\libs\chrono\build\gcc-mingw-4.4.0\debug\link-static\runtime-link- static\threading-multi\chrono.o In file included from ./boost/chrono/chrono.hpp:73, from libs\chrono\src\chrono.cpp:13: ./boost/ratio.hpp:66: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:67: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:68: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:79: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:80: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:81: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:66: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:66: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:66: error: template argument 1 is invalid ./boost/ratio.hpp:66: error: template argument 2 is invalid ./boost/ratio.hpp:66: error: invalid type in declaration before ';' token ./boost/ratio.hpp:67: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:67: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:67: error: template argument 1 is invalid ./boost/ratio.hpp:67: error: template argument 2 is invalid ./boost/ratio.hpp:67: error: invalid type in declaration before ';' token ./boost/ratio.hpp:68: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:68: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:68: error: template argument 1 is invalid ./boost/ratio.hpp:68: error: template argument 2 is invalid ./boost/ratio.hpp:68: error: invalid type in declaration before ';' token ./boost/ratio.hpp:69: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:69: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:69: error: template argument 1 is invalid ./boost/ratio.hpp:69: error: template argument 2 is invalid ./boost/ratio.hpp:69: error: invalid type in declaration before ';' token ./boost/ratio.hpp:70: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:70: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:70: error: template argument 1 is invalid ./boost/ratio.hpp:70: error: template argument 2 is invalid ./boost/ratio.hpp:70: error: invalid type in declaration before ';' token ./boost/ratio.hpp:71: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:71: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:71: error: template argument 1 is invalid ./boost/ratio.hpp:71: error: template argument 2 is invalid ./boost/ratio.hpp:71: error: invalid type in declaration before ';' token ./boost/ratio.hpp:72: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:72: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:72: error: template argument 1 is invalid ./boost/ratio.hpp:72: error: template argument 2 is invalid ./boost/ratio.hpp:72: error: invalid type in declaration before ';' token ./boost/ratio.hpp:73: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:73: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:73: error: template argument 1 is invalid ./boost/ratio.hpp:73: error: template argument 2 is invalid ./boost/ratio.hpp:73: error: invalid type in declaration before ';' token ./boost/ratio.hpp:74: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:74: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:74: error: template argument 1 is invalid ./boost/ratio.hpp:74: error: template argument 2 is invalid ./boost/ratio.hpp:74: error: invalid type in declaration before ';' token ./boost/ratio.hpp:75: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:75: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:75: error: template argument 1 is invalid ./boost/ratio.hpp:75: error: template argument 2 is invalid ./boost/ratio.hpp:75: error: invalid type in declaration before ';' token ./boost/ratio.hpp:76: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:76: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:76: error: template argument 1 is invalid ./boost/ratio.hpp:76: error: template argument 2 is invalid ./boost/ratio.hpp:76: error: invalid type in declaration before ';' token ./boost/ratio.hpp:77: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:77: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:77: error: template argument 1 is invalid ./boost/ratio.hpp:77: error: template argument 2 is invalid ./boost/ratio.hpp:77: error: invalid type in declaration before ';' token ./boost/ratio.hpp:78: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:78: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:78: error: template argument 1 is invalid ./boost/ratio.hpp:78: error: template argument 2 is invalid ./boost/ratio.hpp:78: error: invalid type in declaration before ';' token ./boost/ratio.hpp:79: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:79: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:79: error: template argument 1 is invalid ./boost/ratio.hpp:79: error: template argument 2 is invalid ./boost/ratio.hpp:79: error: invalid type in declaration before ';' token ./boost/ratio.hpp:80: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:80: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:80: error: template argument 1 is invalid ./boost/ratio.hpp:80: error: template argument 2 is invalid ./boost/ratio.hpp:80: error: invalid type in declaration before ';' token ./boost/ratio.hpp:81: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:81: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:81: error: template argument 1 is invalid ./boost/ratio.hpp:81: error: template argument 2 is invalid ./boost/ratio.hpp:81: error: invalid type in declaration before ';' token ./boost/ratio.hpp:131: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:132: error: 'boost::detail::ll_add<X, Y, 1ll>::max' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:151: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:152: error: 'boost::detail::ll_add<X, Y, -0x000000001ll>::max' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:167: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:168: error: 'boost::detail::ll_sub<X, Y, 1ll>::max' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:187: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:188: error: 'boost::detail::ll_sub<X, Y, -0x000000001ll>::max' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:200: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:201: error: 'boost::detail::ll_mul<X, Y>::min' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:202: error: 'boost::detail::ll_mul<X, Y>::max' cannot be initialized by a non-constant expression when being declared In file included from libs\chrono\src\chrono.cpp:13: ./boost/chrono/chrono.hpp:945: error: a function call cannot appear in a constant-expression ./boost/chrono/chrono.hpp:945: error: a function call cannot appear in a constant-expression ./boost/chrono/chrono.hpp:945: error: template argument 1 is invalid ./boost/chrono/chrono.hpp:945: error: template argument 2 is invalid ./boost/chrono/chrono.hpp:945: error: template argument 2 is invalid ./boost/chrono/chrono.hpp:946: error: typedef name may not be a nested-name-specifier ./boost/chrono/chrono.hpp:946: error: expected ';' before 'rep' ./boost/chrono/chrono.hpp:947: error: typedef name may not be a nested-name-specifier ./boost/chrono/chrono.hpp:947: error: expected ';' before 'period' In file included from libs\chrono\src\chrono.cpp:27: libs\chrono\src\/win/chrono.cpp:34: error: 'monotonic_clock' has not been declared libs\chrono\src\/win/chrono.cpp:34: error: expected constructor, destructor, or type conversion before 'monotonic_clock' libs\chrono\src\/win/chrono.cpp:112: error: expected '}' at end of input libs\chrono\src\/win/chrono.cpp:112: error: expected '}' at end of input libs\chrono\src\/win/chrono.cpp:26: warning: '<unnamed>::nanosecs_per_tic' defined but not used ./boost/system/error_code.hpp:208: warning: 'boost::system::system_category' defined but not used ./boost/system/error_code.hpp:209: warning: 'boost::system::generic_category' defined but not used ./boost/system/error_code.hpp:214: warning: 'boost::system::posix_category' defined but not used ./boost/system/error_code.hpp:215: warning: 'boost::system::errno_ecat' defined but not used ./boost/system/error_code.hpp:216: warning: 'boost::system::native_ecat' defined but not used -----Original Message----- From: Tan, Tom (Shanghai) Sent: 2009-12-09 13:41 To: 'boost-users(a)lists.boost.org' Cc: 'vicente.botet(a)wanadoo.fr' Subject: RE: [chrono] New Features + Bug fixes + Updated + documentation >Date: Tue, 8 Dec 2009 23:46:18 +0100 >From: "vicente.botet" <vicente.botet(a)wanadoo.fr> Hi, > >I'm pleased to annonce the new version of the Boost.Chrono library. Even if the library is not yet ready for review I wanted to share it with you. >For the moment I'm not able to test it on Windows and Mac platforms. >Could you check if there are some regressions on Windows or on Mac platforms? Thanks for continuing this library, I've using Beman's version from the sandbox mainly for the process_timer class for benchmarking code efficiency. I just copied your code from the sandbox and compiled it against the latest boost trunk version with VC++10 on WinXP sp3, and received several occurrences of " error C3861: 'INTMAX_C': identifier not found " among others as attached. There seems to be missing some macro guards that could guarantee a correct import of 'INTMAX_C' from boost/cstdint.hpp.

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Re: [Boost-users] [chrono] New Features + Bug fixes + Updated + documentation
by Tan, Tom (Shanghai) 09 Dec '09

09 Dec '09

>Date: Tue, 8 Dec 2009 23:46:18 +0100 >From: "vicente.botet" <vicente.botet(a)wanadoo.fr> >Hi, > >I'm pleased to annonce the new version of the Boost.Chrono library. Even if the library is not yet ready for review I wanted to share it with you. >For the moment I'm not able to test it on Windows and Mac platforms. >Could you check if there are some regressions on Windows or on Mac platforms? Thanks for continuing this library, I've using Beman's version from the sandbox mainly for the process_timer class for benchmarking code efficiency. I just copied your code from the sandbox and compiled it against the latest boost trunk version with VC++10 on WinXP sp3, and received several occurrences of " error C3861: 'INTMAX_C': identifier not found " among others as attached. There seems to be missing some macro guards that could guarantee a correct import of 'INTMAX_C' from boost/cstdint.hpp.

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[thread] variables in thread examples require 'volatile'?
by Gabriel Redner 09 Dec '09

09 Dec '09

Dear Boosters, I'm involved in a bit of a dispute in which a colleague is claiming that 'volatile' is necessary to make certain synchronization patterns correct. As part of my response I pointed out that the boost.thread examples don't use it, but he maintains his position - saying that the examples are flawed. I'm frankly somewhat out of my element here, and I'd like to get input from people who have presumably thought about this stuff a good deal. The example in question is here, under "synopsis": http://www.boost.org/doc/libs/1_41_0/doc/html/thread/synchronization.html#t… The claim is that 'volatile' is needed on the boolean, otherwise the compiler might cache the boolean in a register, and the loop would never exit. He cites for support two articles: http://www.ddj.com/cpp/184403766 https://www.securecoding.cert.org/confluence/display/seccode/DCL17-C.+Bewar… Who's right? Thanks, -Gabe

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