April 2012 - Boost-users - lists.preview.boost.org

Making my UdpConnection class thread safe
by Chris Dunphy 30 Apr '12

30 Apr '12

I have implemented some connection classes, using Boost ASIO, to replace some low level C code in an application, and everything is working great, except for one problem. Basically, I have a UdpConnection class that does synchronous read and write, but it uses async methods to handle time-outs as per the boost examples. The problem is I can't figure out how to make it threadsafe. I have tried adding strands to the event handlers to make this class threadsafe (code below), but that isn't working. I suspect it is because of the way timeout is implemented. I have included my code in 4 classes in pastebin. Single threaded is working fine. I also have TcpConnection and UnixSocketConnection classes that don't need to be shared amongst multiple threads and they work fine. However, I can't get multi-threaded UDP code to work. Am I missing something? Sources below: * Connection.h && AsioConnection.h http://pastebin.com/Cbbw37gL * UdpConnection.h && UdpConnection.cpp http://pastebin.com/VLnHBnPs

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[Boost.Optional] Compilation error with boost::optional in Boost 1.49 and GCC 4.4.6
by Jonathan Jones 30 Apr '12

30 Apr '12

Hello, The following code fails to compile when using GCC 4.4.6 and boost::optional from Boost 1.49: #include <boost/optional/optional.hpp> #include <boost/type_traits/is_convertible.hpp> struct grill { template<typename U> grill (U) {} }; template<typename T> struct bar { template<typename U> bar (U, typename boost::is_convertible<U,T>::type* = 0) {} }; void foo() { typedef bar<grill> data_type; boost::optional<data_type> opt; boost::optional<data_type> opt2(opt); // this line (void)opt2; } Here are the error messages (I apologize for the long lines, I shortened them as much as possible by truncating the header paths): type_traits/is_convertible.hpp: In instantiation of ‘const bool boost::detail::is_convertible_basic_impl<boost::optional_detail::optional_base<bar<grill> >&, grill>::value’: type_traits/is_convertible.hpp:329: instantiated from ‘const bool boost::detail::is_convertible_impl<boost::optional_detail::optional_base<bar<grill> >, grill>::value’ type_traits/is_convertible.hpp:452: instantiated from ‘boost::is_convertible<boost::optional_detail::optional_base<bar<grill> >, grill>’ optional/optional.hpp:604: instantiated from ‘boost::optional<T>::optional(const boost::optional<T>&) [with T = bar<grill>]’ optional.cpp:25: instantiated from here optional/optional.hpp:285: error: ‘boost::optional_detail::optional_base<T>::optional_base(const boost::optional_detail::optional_base<T>&) [with T = bar<grill>]’ is protected type_traits/is_convertible.hpp:170: error: within this context type_traits/is_convertible.hpp:170: error: initializing argument 1 of ‘grill::grill(U) [with U = boost::optional_detail::optional_base<bar<grill> >]’ optional/optional.hpp:308: error: ‘boost::optional_detail::optional_base<T>::~optional_base() [with T = bar<grill>]’ is protected type_traits/is_convertible.hpp:170: error: within this context This reproduction case is distilled from a real world example (not my code) where bar=boost::fusion::vector1 and grill=boost::function<void()> The code compiles fine using the same compiler and Boost 1.44. Any ideas on the root of the problem? Thanks in advance! Jon

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Re: [Boost-users] [CMake] link error in Visual Studio when using boost from CMake
by Alain Leblanc 30 Apr '12

30 Apr '12

Don't have much experience with boost in combination with cmake, but don't you still need to add the boost libraries in a target_link_libraries() command? (Or whatever command is usedbto indicate the libraries to link with). A On Apr 30, 2012 2:49 PM, "Hui Wang" <huiwang8921(a)gmail.com> wrote: > Hello, > > I'm using CMake generated Visual Studio solution, and I added boost with > find_package(Boost), > before that I used commands: set(Boost_USE_STATIC_LIBS > ON) set(Boost_USE_MULTITHREADED ON) set(Boost_USE_STATIC_RUNTIME OFF) > after that I used > commands: include_directories(${Boost_INCLUDE_DIR}) add_executable( > MyProject src/main.cpp) > > Because automatic linking is used on Visual Studio when including Boost, > and it typically use static libraries, I try not to conflict with that. But > I get the error: > LINK : fatal error LNK1104: cannot open file > 'libboost_thread-vc100-mt-gd-1_47.lib' > > I installed pre-compiled binary Boost with the installer provided by > BoostPro Computing, and I checked to find that I do have > libboost_thread-vc100-mt-gd-1_47.lib, libboost_thread-vc100-mt-s-1_47.lib > libboost_thread-vc100-mt-sgd-1_47.lib libboost_thread-vc100-mt-1_47.lib > in C:\Program Files\boost\boost_1_47\lib > > I also output messages to find that > Boost_FOUND=TRUE Boost_LIBRARY_DIRS=C:/Program > Files/boost/boost_1_47/lib Boost_INCLUDE_DIRS=C:/Program > Files/boost/boost_1_47 > > So I'm confused why it has the link error. I tried with dynamically > linking too, it can't find the .dll files at runtime either, but again they > exist right there in the directory I installed boost. Could anyone help me > understand where the problem is? > > Thanks! > -- > Sophie Wang > www.sophiehuiwang.com > > > -- > > Powered by www.kitware.com > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > > Please keep messages on-topic and check the CMake FAQ at: > http://www.cmake.org/Wiki/CMake_FAQ > > Follow this link to subscribe/unsubscribe: > http://www.cmake.org/mailman/listinfo/cmake >

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catch serial port events
by jellad tarek 30 Apr '12

30 Apr '12

hello can i detect a change in pin cts of com1 (in real time) and callback a function with to boost library???? thank you

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get local time in microsecondes :-)
by jellad tarek 30 Apr '12

30 Apr '12

hello i want to get the local time in microseconds (no the diff between 2 times)... like wireshark or commview. in this format 15:23:10,251485 is it possible with the booooost library ?????? 1000 thanks

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filesystem: 'copy' is not a member of boost::filesystem
by Matan Nassau 30 Apr '12

30 Apr '12

Good afternoon, Calling boost::filesystem::copy(), I get the the compiler error 'copy' is not a member of 'boost::filesystem' When I look in boost/filesystem/v3/operations.hpp I see namespace filesystem { … using filesystem3::character_file; // using filesystem3::copy; using copy_file; … } Why is "using filesystem3::copy" line commented out? Matan

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managed_shared_memory memory leak(?)
by Michael Herrmann 29 Apr '12

29 Apr '12

Hello everyone, the following trivial example highlights a memory leak according to MSVC 2010. Does anybody know why this is and how it can be avoided? // The following three directives are required for MSVC's automatic memory // leak detection. #define _CRTDBG_MAP_ALLOC #include <stdlib.h> #include <crtdbg.h> #include <boost/interprocess/managed_shared_memory.hpp> int main(int argc, char *argv[]) { { using namespace boost::interprocess; static const char* shMemIdentifier = "MySharedMemory"; struct ShMemCleaner { ShMemCleaner() { shared_memory_object::remove(shMemIdentifier); } ~ShMemCleaner() {shared_memory_object::remove(shMemIdentifier); } } cleaner; // Create a new segment with given name and size managed_shared_memory segment(create_only, shMemIdentifier, 1024); int* intInShMem = segment.construct<int>("myInt")(2); segment.destroy<int>("myInt"); } _CrtDumpMemoryLeaks(); } Thank you very much! Best, Michael

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C++ Now! Conference Program Highlights C++11
by Jon Kalb 29 Apr '12

29 Apr '12

C++ Now! (formerly BoostCon) is pleased to announce its 2012 program with 35+ inspiring C++ practitioners delivering more than fifty technical sessions. In honor of the release of the new C++11 standard, this May's conference will, for the first time, be offered in three tracks. In addition to the sessions that attendees have come to expecton topics like library design and usage, programming techniques, best practices, academic research, development tools, concurrency, reliability, and performancethis year's program includes a full track devoted to C++11 <http://cppnow.org/locations/c11/> and three keynotes by industry luminaries <http://cppnow.org/overview/> . For those eager to get on board with the new standard, the C++11 content features fifteen hours of tutorial material covering the most important new features and APIs, presented, in many cases, by the language designers themselves. C++ Now! is offering the most complete C++11 tutorial coverage of any conference this year! Conference speakers include book and library authors, academics, C++ Standard Committee members, tool builders, architects, and engineers. With our very high presenter-to-audience ratio, attendees will have ample opportunity for one-on-one interaction with leaders who are currently defining the state of the art in C++. Dave Abrahams, the conference co-chair, writes, "We planned for an expansion, but even I am surprised at the presenter response and the resulting depth of this year's program. I'm preparing for a flood of new attendees." Reserve your place today at http://cppnow.org/registration C++ Now! 2012, held May 13-18 in Aspen Colorado is hosted by Boost in cooperation with ACM. * Complete program: http://cppnow.org/schedule * Speakers: http://cppnow.org/participants * Registration: http://cppnow.org/registration Jon

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date_time, g++-4.7.0, compile error
by List User 29 Apr '12

29 Apr '12

The following code gives compile error with g++-4.7.0 but compiles fine with g++-4.6. #include <iostream> #include <boost/date_time/local_time/local_time.hpp> using namespace std; int main(){ boost::posix_time::ptime time_t_epoch(boost::gregorian::date(1970,1,1)); cout << time_t_epoch << endl; return 0; } The following is the error message that is repeatedly seen (compiler outputs a lot of messages) /usr/include/boost/date_time/local_time/local_date_time.hpp:433:84: error: use of deleted function boost::shared_ptr<boost::date_time::time_zone_base<boost::posix_time::ptime, char> >::shared_ptr(const boost::shared_ptr<boost::date_time::time_zone_base<boost::posix_time::ptime, char> >&) I am using Ubuntu 12.04 and libboost-date-time1.46.1. Any suggestions? thanks suresh

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[wserialization] serializing to a stringstream
by Sean Farrow 29 Apr '12

29 Apr '12

Hi: I'm using xml serialization and need to serialize to a string stream for encryption purposes. As I am using xml_woarchive, should I use wstringstream or just the normal stringstream? Does the wide version even exist? Essentially does the boost serialization library convert to narrow characters before serializing or not? Any help appreciated. Regards Sean.

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How to send serialized data via boost::interprocess::message_queue
by Jens Saathoff 28 Apr '12

28 Apr '12

Hi! I'm working with message_queue and want to send a structure to receiver-app. How to serialize i correctly and how to receive it? Here's some sending code: Data data; > data.counter = 9; > data.money = 5.4; > //data.name = "Guten Tag"; > > std::stringstream os; // = new std::stringstream; > boost::archive::text_oarchive oa(os); > oa << data; > > ipc::message_queue::remove("mq_main"); > ipc::message_queue mq(ipc::create_only, "mq_main", 1, > sizeof(std::stringstream)); > mq.send(&os, sizeof(os), 0); I implemented the serializing code in the structure "Data" Add here's my code to receive: Data data; > std::stringstream is; // = new std::stringstream; > try > { > unsigned int priority; ///< The priority > ipc::message_queue::size_type recvd_size; > ipc::message_queue mq(ipc::open_only, "mq_main"); > > if(mq.try_receive(&is, sizeof(std::stringstream), recvd_size, > priority)) > { > boost::archive::text_iarchive ai(is); // CRASH > ai >> data; > } > //mq.receive(&is, sizeof(is), recvd_size, priority); > //mq.do_receive(ipc::message_queue_t::non_blocking, &is, > sizeof(is), recvd_size, priority); > > //boost::archive::text_iarchive * ai = new > boost::archive::text_iarchive(is); > > //*ai >> data; > > //data << ai; > //mq_recv->receive(&data, sizeof(data), recvd_size, priority); > > ipc::message_queue::remove("mq_main"); > //is.~basic_stringstream(); > } > catch(ipc::interprocess_exception &ex) > { > ipc::message_queue::remove("mq_main"); > std::cout << ex.what() << std::endl; > return; > } > The receiver-app crashes at boost::archive::text_iarchive ai(is). The error is: 0xC0000005: Access violation reading location 0x00f56a34. I really don't have a clue...pls help. Thank you very much :-)

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serialize derived class object through boost::serialization
by breadbread1984 28 Apr '12

28 Apr '12

I want to serialize a derived class object through boost::serialization library. To test whether both the base and the derived class object have been serialized properly, I print message to the console when the serialize function is called. When the following code is compiled and runned, the message of serialize function for the base class object is not shown. Thus, the base class object is not serialized properly. Why the serialization is not done on the base class object? #include <cstdlib> #include <iostream> #include <fstream> #include <boost/serialization/version.hpp> #include <boost/serialization/export.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/shared_ptr.hpp> using namespace std; using namespace boost::archive; using boost::shared_ptr; class Base { friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version); protected: int a; public: Base():a(0){} virtual ~Base(){} int geta() const {return a;} void seta(int aa) {a = aa;} }; template<class Archive> void Base::serialize(Archive & ar,const unsigned int version) { cout<<"serializing base class object"<<endl; ar & a; } class Derived : public Base { friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version); protected: int b; public: Derived():Base(),b(0){} virtual ~Derived(){} int getb() const {return b;} void setb(int bb) {b = bb;} }; template<class Archive> void Derived::serialize(Archive & ar,const unsigned int version) { boost::serialization::base_object<Base>(*this); boost::serialization::void_cast_register<Derived,Base> ( static_cast<Derived*>(NULL), static_cast<Base*>(NULL) ); cout<<"serializing derived class object"<<endl; ar & b; } BOOST_CLASS_EXPORT_GUID(Derived,"Derived"); int main(int argc,char ** argv) { shared_ptr<Base> ptr(new Derived()); ptr->seta(4); Base * p = ptr.get(); Derived * pp = dynamic_cast<Derived*>(p); assert(pp); pp->setb(4); ofstream out("test.dat"); text_oarchive oa(out); oa << p; return EXIT_SUCCESS; }

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undefined symbol: PyUnicodeUCS4_FromEncodedObject
by Dylan Dandelion 28 Apr '12

28 Apr '12

Is there a way to specify boost.python to be built with UCS2 instead of USC4? I am trying to build some libraries and ran into the following error: ImportError: /home/user/boost_1_49_0/stage/lib/libboost_python.so.1.49.0: undefined symbol: PyUnicodeUCS4_FromEncodedObject I am using a version of Python that seems to use only UCS2. # python Python 2.7.2 (default, Aug 24 2011, 22:13:27) [GCC 4.2.4 (Ubuntu 4.2.4-1ubuntu4)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import sys >>> print sys.maxunicode 65535 >From what I searched online so far, there are some suggestions to recompile Python with some flags to use UCS4, but that is not possible for me. Thanks!

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Do boost run well on x64 platform with such warning?
by clive 27 Apr '12

27 Apr '12

Hi,my friends I have a stupid question Now i build boost 1.49 on x64 platform with vc2005 I find such many warnings: warning C4267: '=' : conversion from 'size_t' to 'unsigned int', possible loss of data or conversion from '_int64' to 'unsigned int', possible loss of data I want to make sure that these warnings really do lose data whether or not on x64 flatform. Put another way, could these warning be neglected or should i change the source code? Thanks

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Re: [Boost-users] [xpressive][proto] Generates VS2010 C4714 in 1.49 but not in 1.48
by Lawry, Brian 27 Apr '12

27 Apr '12

Hi Eric. I replaced everything under ..\boost-1_49\boost\proto with the version from trunk yesterday, but I still get the warnings. "/DBOOST_FORCEINLINE=inline" works for me (performance is not an issue in my application). Thanks. Brian >Message: 1 >Date: Wed, 25 Apr 2012 12:44:46 -0700 >From: Eric Niebler <eric(a)boostpro.com> >To: boost-users(a)lists.boost.org >Subject: Re: [Boost-users] [xpressive][proto] Generates VS2010 C4714 > in 1.49 but not in 1.48 >Message-ID: <4F98542E.9080400(a)boostpro.com> >Content-Type: text/plain; charset=ISO-8859-1 >On 4/24/2012 11:33 PM, Eric Niebler wrote: >=> On 4/24/2012 2:48 PM, Lawry, Brian wrote: >>> I would be OK with suppressing the warning, but I haven't been able >>> to do so. Putting "#pragma warning(disable : 4714)" in my source >>> file and in boost/xpressive/detail/core/ sub_match_vector.hpp and in >>> boost/proto/transform/call.hpp does not suppress the warning. Using >>> the "disable specific warnings" compiler switch /wd4714 also does not >>> work. >I checked this and found that the warning can in fact be suppressed. I went through >proto's source files and suppressed it everywhere __forceinline is used. Your sample >code now compiles cleanly with /W4 with boost trunk. >Thanks for the report. >-- >Eric Niebler >BoostPro Computing >http://www.boostpro.com

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Re: [Boost-users] Do boost run well on x64 platform with such warning?
by John Drescher 27 Apr '12

27 Apr '12

> I have a stupid question > Now i build boost 1.49 on x64 platform with vc2005 > I find such many warnings: warning C4267: '=' : conversion from 'size_t' to > 'unsigned int', possible loss of data or conversion from '_int64' to > 'unsigned int', possible loss of data > I want to make sure that these warnings really do lose data whether or not > on x64 flatform. > Put another way, could these warning be neglected or should i change the > source code? Just neglect these warnings. These would only be a problem if size_t had > 4 billion elements. I certainly do not put that many elements into my structures yet! John

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[asio] Getting End of file on ssl::stream::shutdown
by Tak Sze 26 Apr '12

26 Apr '12

I have a very simple SSL client and server program that send messages back and forth using asio ssl stream. Both sides send a "no more message" message when they are done. Then they both call shutdown to shutdown the SSL connection. However, I kept getting "shutdown: End of file" from shutdown. Does anyone know why I am getting that? - Tak

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error: partial specialization after instantiation when using boost.atomic
by niXman 26 Apr '12

26 Apr '12

Hello! I try to use boost.atomic library[1] and when compiling this trivial code: > #include <iostream> > #include <boost/atomic.hpp> > int main() {} http://liveworkspace.org/code/3c355fc61db67d52266a66103bce325a and I get the following error: > boost/atomic/detail/integral-casts.hpp:155:7: > error: partial specialization of 'boost::detail::atomic::platform_atomic<T, 4u>' > after instantiation of 'boost::detail::atomic::platform_atomic<int>' I try to find the 'boost::detail::atomic::platform_atomic<int>' specialization, but couldn`t find it. Maybe someone faced with a similar error. Or maybe someone has an idea what kind of error is this, in fact? Thanks! [1] http://www.chaoticmind.net/~hcb/projects/boost.atomic/ -- Regards, niXman

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program_options, parse_config_file problems
by Andrew E Slaughter 26 Apr '12

26 Apr '12

Hello, I am attempting to parse configuration options from a file using Boost::program_options. I am following the example provided on the website (http://www.boost.org/doc/libs/1_49_0/doc/html/program_options/overview.html…) variables_map vm; store(parse_command_line(argc, argv, desc), vm); store(parse_config_file("example.cfg", desc), vm); notify(vm); I have included the following related to program_options: #include <boost/program_options.hpp> // Boost Program Options #include <boost/program_options/positional_options.hpp> #include <boost/program_options/parsers.hpp> I have the exact code as above in my program but receive the following error. The program works fine if I comment out the line with the parse_config_file line. Can someone please help me get this working. Thanks, Andrew --- COMPILER ERROR -------------------------- /home/slaughter/Documents/programs/source/common/user_options/user_options.cpp: In member function ‘void SlaughterCommon::User_options::apply_options(int, char**)’: /home/slaughter/Documents/programs/source/common/user_options/user_options.cpp:27:76: error: no matching function for call to ‘parse_config_file(const char [22], boost::program_options::options_description&, bool)’ /home/slaughter/Documents/programs/source/common/user_options/user_options.cpp:27:76: note: candidates are: /usr/include/boost/program_options/parsers.hpp:163:5: note: template<class charT> boost::program_options::basic_parsed_options<charT> boost::program_options::parse_config_file(std::basic_istream<charT>&, const boost::program_options::options_description&, bool) /usr/include/boost/program_options/parsers.hpp:176:5: note: template<class charT> boost::program_options::basic_parsed_options<charT> boost::program_options::parse_config_file(const char*, const boost::program_options::options_description&, bool) make[3]: *** [source/common/CMakeFiles/common.dir/user_options/user_options.cpp.o] Error 1 make[2]: *** [source/common/CMakeFiles/common.dir/all] Error 2 make[1]: *** [source/common/CMakeFiles/test_user_options.dir/rule] Error 2 make: *** [test_user_options] Error 2

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[xpressive][proto] Generates VS2010 C4714 in 1.49 but not in 1.48
by Lawry, Brian 25 Apr '12

25 Apr '12

The following code produces a C4714 warning in Visual Studio 2010 with Boost 1.49 but not 1.48: ------------------------------------------------------------------------ ---------------------------------------- #include "stdafx.h" #include <boost/xpressive/xpressive.hpp> void main() { using namespace boost::xpressive; sregex pat1 = "foo" >> +space >> "bar"; // OK in 1.48, C4714 in 1.49 sregex pat2 = "foo" >> +space >> "bar" >> +space; // OK in 1.48, C4714 in 1.49 sregex pat3 = "foo" >> +space; // OK in 1.48, OK in 1.49 sregex pat4 = "foo" >> +space >> +digit; // OK in 1.48, OK in 1.49 sregex pat5 = +space >> "foo" >> +space; // OK in 1.48, C4714 in 1.49 } ------------------------------------------------------------------------ ---------------------------------------- System: Compiler: Visual Studio 2010 SP1 [Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 16.00.40219.01 for 80x86] Compiler warning level: /W4 OS: Windows 7 Professional 32-bit I would be OK with suppressing the warning, but I haven't been able to do so. Putting "#pragma warning(disable : 4714)" in my source file and in boost/xpressive/detail/core/ sub_match_vector.hpp and in boost/proto/transform/call.hpp does not suppress the warning. Using the "disable specific warnings" compiler switch /wd4714 also does not work. Complete warning text: ------------------------------------------------------------------------ ---------------------------------------- 1>c:\Boost\include\boost-1_49\boost/xpressive/detail/core/sub_match_vect or.hpp(115): warning C4714: function 'boost::xpressive::detail::static_xpression<Matcher,Next> boost::proto::call<PrimitiveTransform>::impl2<Expr,State,Data,B>::operat or ()(const boost::proto::exprns_::expr<Tag,Args,Arity> &,const boost::xpressive::detail::static_xpression<boost::xpressive::detail::str ing_matcher<Traits,ICase>,boost::xpressive::detail::static_xpression<Mat cher,boost::xpressive::detail::static_xpression<boost::xpressive::detail ::end_matcher,boost::xpressive::detail::no_next>>> &,boost::xpressive::detail::xpression_visitor<BidiIter,ICase,Traits> &) const' marked as __forceinline not inlined 1> with 1> [ 1> Matcher=boost::xpressive::detail::simple_repeat_matcher<boost::xpressive ::detail::static_xpression<boost::xpressive::detail::posix_charset_match er<traits_type>,boost::xpressive::detail::true_xpression>,boost::mpl::tr ue_>, 1> Next=boost::xpressive::detail::static_xpression<boost::xpressive::detail ::string_matcher<traits_type,boost::mpl::false_>,boost::xpressive::detai l::static_xpression<boost::xpressive::detail::simple_repeat_matcher<boos t::xpressive::detail::static_xpression<boost::xpressive::detail::posix_c harset_matcher<traits_type>,boost::xpressive::detail::true_xpression>,bo ost::mpl::true_>,boost::xpressive::detail::static_xpression<boost::xpres sive::detail::end_matcher,boost::xpressive::detail::no_next>>>, 1> PrimitiveTransform=boost::xpressive::Grammar<char> (boost::xpressive::grammar_detail::as_repeat<char,boost::xpressive::Gram mar<char>,boost::mpl::true_>), 1> Expr=const boost::proto::exprns_::expr<boost::proto::tagns_::tag::unary_plus,boost: :proto::argsns_::list1<const boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::p roto::argsns_::term<boost::xpressive::detail::posix_charset_placeholder> ,0> &>,1> &, 1> State=boost::xpressive::detail::static_xpression<boost::xpressive::detai l::string_matcher<traits_type,boost::mpl::false_>,boost::xpressive::deta il::static_xpression<boost::xpressive::detail::simple_repeat_matcher<boo st::xpressive::detail::static_xpression<boost::xpressive::detail::posix_ charset_matcher<traits_type>,boost::xpressive::detail::true_xpression>,b oost::mpl::true_>,boost::xpressive::detail::static_xpression<boost::xpre ssive::detail::end_matcher,boost::xpressive::detail::no_next>>>, 1> Data=boost::xpressive::detail::xpression_visitor<std::_String_const_iter ator<char,std::char_traits<char>,std::allocator<char>>,boost::mpl::false _,traits_type> , 1> B=true, 1> Tag=boost::proto::tagns_::tag::unary_plus, 1> Args=boost::proto::argsns_::list1<const boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::p roto::argsns_::term<boost::xpressive::detail::posix_charset_placeholder> ,0> &>, 1> Arity=1, 1> Traits=traits_type, 1> ICase=boost::mpl::false_, 1> BidiIter=std::_String_const_iterator<char,std::char_traits<char>,std::al locator<char>> 1> ] 1> c:\Boost\include\boost-1_49\boost/proto/transform/call.hpp(168) : see declaration of 'boost::proto::call<PrimitiveTransform>::impl2<Expr,State,Data,B>::opera tor ()' 1> with 1> [ 1> PrimitiveTransform=boost::xpressive::Grammar<char> (boost::xpressive::grammar_detail::as_repeat<char,boost::xpressive::Gram mar<char>,boost::mpl::true_>), 1> Expr=const boost::proto::exprns_::expr<boost::proto::tagns_::tag::unary_plus,boost: :proto::argsns_::list1<const boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal,boost::p roto::argsns_::term<boost::xpressive::detail::posix_charset_placeholder> ,0> &>,1> &, 1> State=boost::xpressive::detail::static_xpression<boost::xpressive::detai l::string_matcher<traits_type,boost::mpl::false_>,boost::xpressive::deta il::static_xpression<boost::xpressive::detail::simple_repeat_matcher<boo st::xpressive::detail::static_xpression<boost::xpressive::detail::posix_ charset_matcher<traits_type>,boost::xpressive::detail::true_xpression>,b oost::mpl::true_>,boost::xpressive::detail::static_xpression<boost::xpre ssive::detail::end_matcher,boost::xpressive::detail::no_next>>>, 1> Data=boost::xpressive::detail::xpression_visitor<std::_String_const_iter ator<char,std::char_traits<char>,std::allocator<char>>,boost::mpl::false _,traits_type> , 1> B=true 1> ] ------------------------------------------------------------------------ ---------------------------------------- Thanks in advance for any assistance. Brian Lawry blawry(a)cccglobal.com Compressor Controls Corp Manufacturing Software Engineer /"\ ASCII Ribbon Campaign \ / no HTML in email & vCards X no proprietary attachments / \ use open standards

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[Random] Noob question: Random number generators inside function
by Błażej Jaworowski 25 Apr '12

25 Apr '12

I have a Monte Carlo simulation program (Ising model) in which I wanted to use Boost.Random number generators instead of one from *Numerical Recipes. *It works when the generator is called only in main, but when I use it inside function, I have "identifier not found". I don't want to initialize them each time I call a function because this will repeat the sequences of random number. Is there a way to overcome it? I don't know much about typedefs and templates, so my initialization of the generator is just copied from some tutorial and changed in, I hope, appropriate places. Here is the example code (I wouldn't paste original program, it's too long, but here is the same problem) // random_test.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include "iostream" #include <ctime> #include <boost/random.hpp> using namespace std; namespace boost { namespace random { template<typename UIntType, int w, unsigned int p, unsigned int q> class lagged_fibonacci_engine; template<typename RealType, int w, unsigned int p, unsigned int q> class lagged_fibonacci_01_engine; typedef lagged_fibonacci_01_engine< double, 48, 607, 273 > lagged_fibonacci607; typedef lagged_fibonacci_01_engine< double, 48, 1279, 418 > lagged_fibonacci1279; typedef lagged_fibonacci_01_engine< double, 48, 2281, 1252 > lagged_fibonacci2281; typedef lagged_fibonacci_01_engine< double, 48, 3217, 576 > lagged_fibonacci3217; typedef lagged_fibonacci_01_engine< double, 48, 4423, 2098 > lagged_fibonacci4423; typedef lagged_fibonacci_01_engine< double, 48, 9689, 5502 > lagged_fibonacci9689; typedef lagged_fibonacci_01_engine< double, 48, 19937, 9842 > lagged_fibonacci19937; typedef lagged_fibonacci_01_engine< double, 48, 23209, 13470 > lagged_fibonacci23209; typedef lagged_fibonacci_01_engine< double, 48, 44497, 21034 > lagged_fibonacci44497; } } void generate(); int _tmain(int argc, _TCHAR* argv[]) {const int rangeMin = 1; const int rangeMax = 10; typedef boost::uniform_real<> NumberDistribution; typedef boost::random::lagged_fibonacci9689 RandomNumberGenerator; typedef boost::variate_generator<RandomNumberGenerator&, NumberDistribution> Generator; NumberDistribution distribution(rangeMin, rangeMax); RandomNumberGenerator generator; Generator numberGenerator(generator, distribution); generator.seed(time(0)); // seed with the current time generate(); return 0; } void generate(){cout << numberGenerator() << endl;}

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compiler.hpp problem
by Petros 24 Apr '12

24 Apr '12

Hi, I am using boost 1.48 with msvc2010 on win7. When compiling, I get the following error ( and then many more on the same file ) : C:\_petros\_otc\ext\boost_1_48_0\boost/mpl/aux_/config/compiler.hpp(1): error C2059: syntax error : ':' I tried to look into the file and it does not look like an ordinary C++ header. I have no idea what to do with this error message.. On my laptop (boost 1.47) it does not give me this message. One more thing: I had to reinstall win7 and copied the previously saved boost build which then copied to the proper directory. Any ideas/input will be greatly appreciated. TIA, Petros

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Re: [Boost-users] passing compiler directives
by Matt Priest 24 Apr '12

24 Apr '12

Hello, I'm not sure if this is the standard etiquette for this mailing list, but I thought I would follow up on solution I found for this issue. Maybe it's of value to someone. I had assumed that the required dependencies needed by the source file, unique_path.cpp, weren't getting there because of an inability to get the location to the compiler. It turns out that "read" and "close" aren't available via the <fcntl.h> header on this system (SuSE 11.?). They are available in the <unistd.h>... clearly a minor issue. I was not enthused about modifying the source files in the boost tree, but adding the "#include <unistd.h>" fixed the issue. Recompiling and adding the Bzip libs/header resulted in 1014 targets built with no "fail" messages. Here was the edit to "libs/filesystem/v3/src/unique_path.cpp", line #31: 27-#include <boost/filesystem/v3/operations.hpp> 28- 29-# ifdef BOOST_POSIX_API 30-# include <fcntl.h> 31:# include <unistd.h> 32-# else // BOOST_WINDOWS_API 33-# include <windows.h> Matt Subject: passing compiler directives Date: Mon, 23 Apr 2012 14:24:00 -0500 From: Matt Priest <mpriest(a)cray.com><mailto:mpriest@cray.com> To: <boost-users(a)lists.boost.org><mailto:boost-users@lists.boost.org> Hello, In advance, please excuse this newbie question. I am trying to build boost_1_48_0 and it is going well for all but 4 targets, two of which are the disclaimed <iostreams> failures relating to the bzip targets. However, I'm getting errors when trying to build : boost_1_48_0/libs/filesystem/v3/src/unique_path.cpp Here's the error (there's a nearly duplicate error for the statically linked target): gcc.compile.c++ /users/mpriest/Docs/Boost/build/boost/bin.v2/libs/filesystem/build/gcc-4.7.0/release/threading-multi/v3/src/unique_path.o libs/filesystem/v3/src/unique_path.cpp: In function 'void {anonymous}::system_crypt_random(void*, std::size_t, boost::system::error_code*)': libs/filesystem/v3/src/unique_path.cpp:68:49: error: 'read' was not declared in this scope libs/filesystem/v3/src/unique_path.cpp:71:17: error: 'close' was not declared in this scope libs/filesystem/v3/src/unique_path.cpp:79:13: error: 'close' was not declared in this scope "gcc" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -m64 -pthread -fPIC -DBOOST_ALL_NO_LIB=1 -DBOOST_FILESYSTEM_DYN_LINK=1 -DBOOST_SYSTEM_DYN_LINK=1 -DNDEBUG -I"." -c -o "/users/mpriest/Docs/Boost/build/boost/bin.v2/libs/filesystem/build/gcc-4.7.0/release/threading-multi/v3/src/unique_path.o" "libs/filesystem/v3/src/unique_path.cpp" ...failed gcc.compile.c++ /users/mpriest/Docs/Boost/build/boost/bin.v2/libs/filesystem/build/gcc-4.7.0/release/threading-multi/v3/src/unique_path.o... It seems like a simple include file availability issue or a pre-processor define issue, but I can't seem to affect a change in that compiler command through the user-config.jam file edits. When I run b2 with --debug-configuration option, I clearly see that change the -L and -I options in the user-config.jam file is reflected in the output, but still only see the -I"." option as shown above. It seems to me that those functions, read and close, should be made available through including the usual <fcntl.h>, and I think it's a bit curious that no other targets fail from the lack of "read" and "close". Any insight would be appreciated... thank you. Matt

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Re: [Boost-users] [Test] Compiling libraries for Windows Mobile 6 ARMV4I
by Daniel Angel Muñoz Trejo 24 Apr '12

24 Apr '12

Hi Paul, I'm also trying to compile boost for WM6 ARMV4I with STLPort 5.2.1. I'm stuck still in the STLPort part. What steps did you follow to build STLPort 5.2.1 and then boost? I'm stuck in things like this for example: The configure --help of stlport states for evc9: (*) For these compilers the target processor is determined automatically. You must run the WCE*.BAT file you wish to build STLport for before running configure. But there isn't any WCE*.bat file in stlport zip. Do you (or anyone else) remember what steps did you follow to build? Thanks! -- Daniel Angel Muñoz Trejo

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[Preprocessor] ternary identity macro
by Sebastian Pfützner 24 Apr '12

24 Apr '12

Hello, I often write something like #define TEXT(z, n, data) data BOOST_PP_ENUM(5, TEXT, xxx) in my code to create a comma separated list of words. Is there already a macro like TEXT in boost? Or is there a even better way to do what I want? Thanks in advance

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