March 2012 - Boost - lists.preview.boost.org

bad include guards
by Steven Watanabe 26 Jan '17

26 Jan '17

AMDG The following pairs of files have identical include guards ./boost/concept_check/general.hpp ./boost/concept/detail/msvc.hpp ./boost/concept_check/msvc.hpp ./boost/concept/detail/msvc.hpp ./boost/filesystem/cerrno.hpp ./boost/cerrno.hpp ./boost/interprocess/containers/tree.hpp ./boost/interprocess/containers/detail/tree.hpp ./boost/mpl/min_max.hpp ./boost/mpl/max.hpp ./boost/mpl/vector/aux_/front.hpp ./boost/mpl/list/aux_/front.hpp ./boost/multi_index/identity_fwd.hpp ./boost/multi_index/identity.hpp ./boost/python/pointee.hpp ./boost/python/detail/pointee.hpp ./boost/spirit/phoenix/closures.hpp ./boost/lambda/closures.hpp ./boost/xpressive/proto/v1_/proto_typeof.hpp ./boost/xpressive/proto/proto_typeof.hpp ./libs/config/test/boost_no_dep_nested_class.ipp ./libs/config/test/boost_has_vc6_mem_templ.ipp ./libs/config/test/boost_no_mem_templates.ipp ./libs/config/test/boost_has_vc6_mem_templ.ipp ./libs/config/test/boost_no_std_allocator.ipp ./libs/config/test/boost_has_vc6_mem_templ.ipp ./libs/conversion/test.hpp ./libs/any/test.hpp ./libs/interprocess/example/print_container.hpp ./libs/interprocess/example/printcontainer.hpp ./libs/interprocess/test/expand_bwd_test_template.hpp ./libs/interprocess/test/allocation_test_template.hpp ./libs/interprocess/test/printcontainer.hpp ./libs/interprocess/example/printcontainer.hpp ./libs/interprocess/test/print_container.hpp ./libs/interprocess/example/printcontainer.hpp ./libs/iostreams/test/detail/utf8_codecvt_facet.hpp ./boost/detail/utf8_codecvt_facet.hpp ./libs/regex/test/regress/test_regex_search.hpp ./libs/regex/test/regress/test_partial_match.hpp ./libs/serialization/test/C.hpp ./libs/serialization/test/A.hpp ./libs/xpressive/perf/regex_comparison.hpp ./libs/regex/performance/regex_comparison.hpp ./tools/inspect/time_string.hpp ./tools/common/time_string.hpp In Christ, Steven Watanabe

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Arguing about names in Boost libraries
by Edward Diener 06 May '15

06 May '15

What is wrong with the people commenting on libraries for Boost who are so concerned about the names being used ? We are talking only about C++ identifiers and yet there are now endless discussions where people disagree on names or argue that some name is not what they want or that they like some other name, with a list of names that they find adequate. This is irrelevant. There is something mentally wrong about all those peoples spending endless amounts of time around this issue. I notice this does not happen nowadays for just one library but for ever single library, or proposed library, which is mentioned on this mailing list. Is this the way all of you people actually work in your daily jobs, or on your own projects, spending hours and days arguing with others about C++ identifiers for every little thing ? Are you not aware of the absurdity of your endless remarks ? Grow up ! Surely there are better things to do than carry on endlessly about some name, that is should be x or y or z or some other inane preferable list. It's time for somebody to say this, so I will do it. A C++ identifier name, as long as it is vaguely about what the functionality entails, is perfectly adequate. It does not have to satisfy everyone in the universe. Period !

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Why no non-null smart pointers?
by Ross MacGregor 29 Apr '14

29 Apr '14

I just created a very small smart pointer libary for our project. It will contain two types of shared pointers: SharedHandle and NullableSharedHandle. SharedHandle will be a shared pointer that cannot be null by ensuring a non-null construction while NullableSharedHandle will basically be a typedef for boost::shared_ptr. I firmly believe that code can be made more reliable by minimizing the use of nullable pointers. To this end, I think it is important that we start using non-null pointer types. Ideally the compiler would be able to understand a non-null pointer and catch bugs at compile time, but I think we can still improve things with a few runtime checks. If we make sure that a shared pointer is constructed with a non-null pointer and ban any reset() type methods, we guarentee that it points to something. This can be beneficial for the following reasons: 1. Any function that uses this type will no longer be burdened with precondition checks to make sure variables of this type are not null. 2. It's type is simply more explicit and better explains its function. 3. Moving the non-null check to the creation phase will reduce the possibility of encountering null pointer exceptions at runtime (assuming there are many more pointer references than constructor calls). So my little pointer library seems to make a lot of sense, but if so why hasn't this simple smart pointer variation made it into boost yet? Has this been discussed somewhere already? My search on non-null smart pointers is not revealing much discussion on the topic. Regards, Ross

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[mpl] integral_c [type_traits] integral_constant limits
by vicente.botet 21 Oct '13

21 Oct '13

Hi, I was testing Boost.Ratio with gcc-4.6 c++0x and I get some compile errors when instantiating std::cout << boost::mpl::integral_c< boost::intmax_t, boost::integer_traits<boost::intmax_t>::const_max >::value ; ..\..\..\../boost/mpl/aux_/integral_wrapper.hpp: In instantiation of 'mpl_::integral_c<long long int, 0x7fffffffffffffffll>': ratio_io\ratio_io.pass.cpp:24:6: instantiated from here ..\..\..\../boost/mpl/aux_/integral_wrapper.hpp:72:96: warning: integer overflow in expression [-Woverflow] ..\..\..\../boost/mpl/aux_/integral_wrapper.hpp:72:96: error: '-0x8000000000000000ll' is not a valid template argument for type 'long long int' because it is a non-constant expression ..\..\..\../boost/mpl/aux_/integral_wrapper.hpp:72:96: error: '-0x8000000000000000ll' is not a constant expression integral_wrapper.hpp:72 contains typedef AUX_WRAPPER_INST( BOOST_MPL_AUX_STATIC_CAST(AUX_WRAPPER_VALUE_TYPE, (value + 1)) ) next; The same line pass with gcc-4.6, gcc-4.5 and gcc-4.5 c++0x with just a warning. ..\..\..\../boost/mpl/aux_/integral_wrapper.hpp: In instantiation of 'mpl_::integral_c<long long int, 0x7fffffffffffffffll>': ratio_io\ratio_io.pass.cpp:23:6: instantiated from here ..\..\..\../boost/mpl/aux_/integral_wrapper.hpp:72:96: warning: integer overflow in expression [-Woverflow] integral_c is by integral_constant, but integral_constant doesn't needs next a prior types. This means that with the current implementation we can not use integral_constant with the max value of the type. Do you think this is a bug in integral_constant? Best, _____________________ Vicente Juan Botet Escribá http://viboes.blogspot.com/

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[asio] Randomly having problems reading from the socket
by Torben Wiggerich 29 Jul '13

29 Jul '13

Hi all, I have some problems using the boost.asio.read for a TCP-socket. So far it works fine, but it randomly stops the transfer for at least 5 seconds. To resolve the error I used a simple synchronous server and client from the boost examples and modified it too send a larger amount of data. (307400 Bytes; this size comes from the program I'm trying to get run). On the client side I also changed the reading from the socket to read the complete data with boost.asio.read and transfer_all as argument. Both, server and client, measure the time for sending and reading to the socket and will give an error if it needs more than 1 second. Here is the sourcecode for the server: #include <iostream> #include <string> #include <boost/asio.hpp> #include <boost/date_time/posix_time/posix_time.hpp> using boost::asio::ip::tcp; using namespace boost::posix_time; int main() { try { boost::asio::io_service io_service; tcp::acceptor acceptor(io_service, tcp::endpoint(tcp::v4(), 8002)); tcp::socket socket(io_service); acceptor.accept(socket); unsigned char * array = new unsigned char[307400]; for (;;) { boost::system::error_code ignored_error; ptime startTime = microsec_clock::universal_time(); boost::asio::write(socket, boost::asio::buffer( array, 307400 ), boost::asio::transfer_all(), ignored_error); time_duration neededTime = microsec_clock::universal_time() - startTime; if ( neededTime.total_milliseconds() > 1000 ) { std::cout << "ERROR needed too much time: " << neededTime.total_milliseconds() << "ms" << std::endl; } } } catch (std::exception& e) { std::cerr << e.what() << std::endl; } return 0; } My client sourcecode: #include <iostream> #include <boost/array.hpp> #include <boost/asio.hpp> #include <boost/date_time/posix_time/posix_time.hpp> using boost::asio::ip::tcp; using namespace boost::posix_time; int main(int argc, char* argv[]) { try { if (argc != 2) { std::cerr << "Usage: client <host>" << std::endl; return 1; } boost::asio::io_service io_service; boost::asio::ip::tcp::endpoint endpoint( boost::asio::ip::address::from_string( argv[1] ), 8002 ); tcp::socket socket(io_service); boost::system::error_code error = boost::asio::error::host_not_found; socket.connect( endpoint, error ); if (error) throw boost::system::system_error(error); int counter = 0; unsigned char* array = new unsigned char[307400]; for (;;) { boost::system::error_code error; ptime startTime = microsec_clock::universal_time(); size_t len = boost::asio::read( socket, boost::asio::buffer( array, 307400 ), boost::asio::transfer_all(), error ); time_duration neededTime = microsec_clock::universal_time() - startTime; if ( error ) { printf( "body read error %s\n", error.message().c_str() ); } if ( counter % 5000 == 0 ) { std::cout << "passed: " << counter << "\r"; } ++counter; if ( neededTime.total_milliseconds() > 1000 ) { std::cout << "ERROR needed too much time: " << neededTime.total_milliseconds() << "ms" << std::endl; } } } catch (std::exception& e) { std::cerr << e.what() << std::endl; } return 0; } To reproduce the error just let it run for a while. It can take up to 30 minutes or even more... After a while it will produce the line: "ERROR needed too much time: 5007ms". Maybe with slightly different times, but all around 5 seconds. I tested it on different machines with Windows Vista and Seven. So am I'm doing sth. wrong? Is the reading from the socket correct? I'm using boost version 1.44. Kind regards Torben Wiggerich

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De Bruijn Bind (alternate bind syntax) Interest?
by David Sankel 24 Jun '13

24 Jun '13

Hello all, I've been working on an alternate bind syntax based on De Bruijn indices[1]. The syntax is very simple, yet the terms are very powerful. Here is an example of a function const that takes in an argument c and returns another function that, for all input, returns c: //λx.λy.x = λλ1 with De Bruijn indices. auto const_ = abs<1>( abs<1>( var<1,0>() ) ); More examples, further explanation, and an implementation are available here[2]. I'm thinking that this library could also be useful as a core for more syntax heavy bind variations. David [1] http://en.wikipedia.org/wiki/De_Bruijn_index [2] http://bitbucket.org/camior/de-bruijn-bind/ -- David Sankel Sankel Software www.sankelsoftware.com 585 617 4748 (Office)

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[config] consexpr workaround
by vicente.botet 21 Mar '13

21 Mar '13

Hi, in order to make easier the introduction of constexpr in a portable way I would like we add a Boost Config workarround. We can define some macros depending on whether BOOST_NO_CONSTEXPR is defined or not. #if defined(BOOST_NO_CONSTEXPR) #define BOOST_CONSTEXPR #define BOOST_CONSTEXPR_OR_CONST const #else #define BOOST_CONSTEXPR constexpr #define BOOST_CONSTEXPR_OR_CONST constexpr #endif For most of the constexpr functions or constructors BOOST_CONSTEXPR will work. constexpr tuple(); =versus= BOOST_CONSTEXPR tuple(); When used for static constants BOOST_CONSTEXPR_OR_CONST is needed as we need to preserv the const keyword when consexpr is not available. static constexpr UIntType xor_mask = a; =versus= static BOOST_CONSTEXPR_OR_CONST UIntType xor_mask = a; We could also add a STATIC_CONSTEXPR macro #define BOOST_STATIC_CONSTEXPR static BOOST_CONSTEXPR_OR_CONST static constexpr UIntType xor_mask = a; =versus= BOOST_STATIC_CONSTEXPR UIntType xor_mask = a; For this case the existing macro BOOST_STATIC_CONSTANT could be modified to use BOOST_CONSTEXPR_OR_CONST when static const was used. static constexpr UIntType xor_mask = a; =versus= BOOST_STATIC_CONSTANT(UIntType, xor_mask = a); Can we introduce this workaround? Best regards, Vicente _____________________ Vicente Juan Botet Escribá http://viboes.blogspot.com/

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Fwd: [Thread] Solution to conflict with MFC?
by Thorsten Ottosen 28 Feb '13

28 Feb '13

Hi Thread maintainers, Anthony speaks about a patch to make this work. Does anyone know where it is? And could it be applied? Thanks -Thorsten -------- Original Meddelelse -------- Subject: [Thread] Solution to conflict with MFC? Date: Tue, 26 Apr 2011 13:28:56 +0200 From: Christian Larsen <contact(a)dword.dk> Reply-To: boost-users(a)lists.boost.org To: boost-users(a)lists.boost.org Newsgroups: gmane.comp.lib.boost.user Hello, I know this has been asked before, but I could not find a good solution. I'm experiencing problems with an application using both MFC and Boost.Thread. Specifically the assertion ASSERT(AfxGetModuleState() != AfxGetAppModuleState()); in AfxCoreInitModule() fails. I link Boost.Thread statically into a DLL in my project. From previous posts to this list and elsewhere, e.g. http://lists.boost.org/boost-users/2009/04/46929.php, I see that the issue is caused by setting _pRawDllMain in tss_pe.cpp. Commenting this line does "solve" the problem, but I would rather not have to hack the Boost source code this way. It seems there is a patch somewhere for this problem (referred to in http://lists.boost.org/boost-users/2009/04/47015.php) but it appears it never made it into the source. Is there any chance of this issue being solved in a better way? Best regards, Christian Larsen

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[multi_index] Move Semantics
by Mark Snelling 27 Feb '13

27 Feb '13

Hi, I've been a user of Boost.MultiIndex for a number of years and think it's a great library. Is there any firm plan to add move semantics? It's been noted under "Future Work" in the docs since Boost 1.32. Regards, Mark

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[parameter] std proposal
by Lorenzo Caminiti 07 Jan '13

07 Jan '13

Hello all, Is there a C++ standard proposal for named parameter addition? I am looking for an "N-paper" for named parameters similar to N2081 for concepts, or N1962 for contracts. Thank you. -- Sent from my mobile device Lorenzo

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[#pragma once]
by Sid Sacek 18 Nov '12

18 Nov '12

I've worked with the MSVC, Sun and GCC compilers. Each one of them supports #pragma once. Is there any reason to wrap this pragma within #ifdefs? Are there any compilers out there today that don't support this #pragma? #if defined( _MSC_VER ) && ( _MSC_VER >= 1020 ) # pragma once #endif Could we change this coding pattern so that it no longer looks like MSVC is being selfish? -Sid Sacek

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[config] explicit call of operator templates / msvc bug workaround
by Stefan Strasser 10 Oct '12

10 Oct '12

Hi, is there already a macro in Boost.Config that allows you to insert the "template" keyword in the following code for those compilers that require it? struct functor{ template<class T> void operator()(); }; template<class F> void g(F f){ f.template operator()<int>(); //(1) works with GCC and comeau f.operator()<int>(); //(2) works with MSVC } this apparently only applies to operator calls. MSVC accepts both (1) and (2) for regular functions. (instantiating the operator template with an object of type T as argument, like mpl::for_each does, is not an option. I can't construct T.) thanks, Stefan

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[test] Trunk broken: What happened to test_exec_monitor?
by John Maddock 21 Sep '12

21 Sep '12

Testing on Trunk is apparently broken as the test_exec_monitor target has been removed from Boost.Test Trunk as of revision #74642. A quick grep shows 22 Jamfiles and over 200 targets dependent upon this. Whats happened? John.

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[build] 1.49 unable to bootstrap boost
by yuri kilochek 12 Sep '12

12 Sep '12

Not sure if this goes here. On Windows 7, when I try to do bootstrap on a freshly unzipped boost 1.49 at the root directory, I get the following output: Building Boost.Build engine But that is as far as it gets before os terminates whatever it is doing with this (roughly translated from russian): **** STACK SIZE EXCEEDED **** **** WHILE PERFORMING RECURSION IN BATCH MODE **** Recursion depth=654, Stack usage=90 percent. **** BATCH PROCESSING ABORTED **** Is there a way to build boost bypassing this?

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[type_traits] has_equal_to< std::vector<T> > always true_
by lcaminiti 15 Jul '12

15 Jul '12

-- View this message in context: http://boost.2283326.n4.nabble.com/boost-type-traits-has-equal-to-std-vecto… Sent from the Boost - Dev mailing list archive at Nabble.com.

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hex/unhex()?
by Olaf van der Spek 19 Jun '12

19 Jun '12

Hi, Does Boost have hex/unhex() that support std::string? I can't find them and I think they'd be quite handy to have. -- Olaf

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[Locale] VC11 Regressions
by Joshua Boyce 18 Jun '12

18 Jun '12

I am currently porting some code to the VC11 compiler beta, and as part of that process I ran the unit tests on the libraries I use and noticed some failures in Boost.Locale under VC11 that are not present under VC10. Ones of the tests (test_winapi_collate) actually crashes (showing the WER dialog etc). Logs for comparison (tests were run on trunk): http://dl.dropbox.com/u/74751/cpp/boost/logs/locale-test-vc10-20120330-2143… http://dl.dropbox.com/u/74751/cpp/boost/logs/locale-test-vc11-20120330-2143… Has anyone else observed this or is it a configuration issue on my end?

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status of sp_counted_base_solaris.hpp
by Graham Bennett 07 Jun '12

07 Jun '12

Hi all, I'm interested in getting boost::shared_ptr to use atomic ops on Solaris. I notice there is an implementation using the OS-provided atomics in boost/detail/sp_counted_base_solaris.hpp, but it doesn't seem to be included. According to this thread: http://lists.boost.org/Archives/boost/2006/07/107144.php, it seems the reason might be that it wasn't possible to come up with a proper preprocessor condition to include it on the right versions of Solaris. I'm considering modifying my boost installation to include this header on Solaris - does anyone know of any issues with the code, or can they confirm that it has been well tested? Are there any other reasons for its omission? Thanks, Graham -- Graham Bennett

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[fusion] Trouble using BOOST_FUSION_ADAPT_ADT with boost::fusion::operator<
by GOODHART, TAYLOR 17 May '12

17 May '12

Hi all, I'm attempting to adapt a third-party struct into a fusion sequence using BOOST_FUSION_ADAPT_ADT to get access to a nice operator<. Unfortunately compilation fails and I'm not sure if it's a bug or me using the library incorrectly. As best I can read the error message, it looks like the code is attempting to compare adt_attribute_proxy structs instead of the values represented by these. Below is some code that demonstrates the problem. Can anybody help me out? Thanks, Taylor #include <boost/fusion/adapted/adt/adapt_adt.hpp> #include <boost/fusion/adapted/struct/define_struct.hpp> #include <boost/fusion/adapted/struct/adapt_struct.hpp> #include <set> #include <string> #include <boost/fusion/sequence/comparison/less.hpp> struct test1 { std::string s; const std::string & getS() const { return s; } void setS( const std::string & s_) { s = s_; } }; BOOST_FUSION_ADAPT_ADT( test1, (const std::string &, const std::string &, obj.getS(), obj.setS(val)) ) BOOST_FUSION_DEFINE_STRUCT( , test2, (std::string, s) (int, a) ) struct test3 { std::string s; }; BOOST_FUSION_ADAPT_STRUCT( test3, (std::string, s) ) using boost::fusion::operator<; int main( int argc, char * argv[]) { //Fails /*std::set<test1> destinations1; destinations1.insert(test1());*/ std::set<test2> destinations2; destinations2.insert(test2()); std::set<test3> destinations3; destinations3.insert(test3()); return 0; }

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Latest version and status of lockfree
by Julien Nitard 06 May '12

06 May '12

Hi All, Where can I find the latest version of boost.lockfree ? There's nothing in the sandbox or the vault (it seems). The latest commit on Tim's public git repo was done more than 6 month ago. Now that atomic has been accepted, are there any roadblocks to have boost.lockfree released ? Many thanks, Julien

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[contract] syntax redesign
by Lorenzo Caminiti 04 May '12

04 May '12

Hello all, After a long time of inactivity for Boost.Contract, I am considering how to re-design its macro syntax to make it simpler. I can eliminate a large number of extra parenthesis based on a few pp tricks I've learned in processing Boost.Local's `const bind(type)& var`. Plus, I can provide (optional) support for variadics macros so to use comma-separated pp tuplets instead of parenthesized pp sequences on preprocessors with variadics. For example, I _think_ (but I've not implemented this yet) that I can simplify the syntax like this: #include <contract.hpp> #include <vector> #include "myvector/pushable.hpp" // Wrapper class that adds contracts to std::vector. CONTRACT_CLASS( template( typename T ) class (myvector) extends( public pushable<T> ) // Subcontracting. ) { CONTRACT_CLASS_INVARIANT( empty() == (size() == 0) // More invariants here (comma separated)... ) CONTRACT_FUNCTION( public void (push_back)( (const T&) element ) precondition( size() < max_size() // More preconditions here (comma separated)... ) postcondition( auto old_size = CONTRACT_OLDOF(size()), // Old value. size() == old_size + 1 // More postconditions here (comma separated)... ) ) { vector_.push_back(element); // Implementation. } // Rest of the class here (with more contracts if needed)... public: typedef typename std::vector<T>::size_type size_type; size_type size(void) const { return vector_.size(); } size_type max_size(void) const { return vector_.max_size(); } bool empty(void) const { return vector_.empty(); } const T& back(void) const { return vector_.back(); } private: std::vector<T> vector_; }; For a side-by-side comparison with N1962 syntax: http://svn.boost.org/svn/boost/sandbox/contract/libs/contract/doc/html/inde… For a comparison of the entire std::vector (plus Boost.ConceptCheck concepts): http://svn.boost.org/svn/boost/sandbox/contract/libs/contract/doc/html/cont… For a comparison for all Boost.Contract features (plus Boost.ConceptCheck concepts and Boost.Parameter named parameters): http://svn.boost.org/svn/boost/sandbox/contract/libs/contract/doc/html/cont… (Don't pay attention to the rest of the docs that are way out of date.) A few notes: * Extra parenthesis are still needed around class and function names. * Extra parenthesis are still needed around types (like for the parameter `(T) element`) but only if the type is not a C++ keyword (no parenthesis needed aournd int, double, void, etc) or it contains a symbol (parenthesis needed if & or * are used `(int&) x`, etc). * In postconditions, the `auto old_size = CONTRACT_OLDOF(size())` only copies the vector size (and not the entire vector :)) ). Similarly, `auto result = return` can be used to access the return value for non-void functions. (The `auto ...` is parsed by the pp and it's implemented using Boost.Typeof so no C++0x is required.) * Template declaration (but not instantiation) angular parenthesis <> are replaced by round parenthesis (). All of this _should_ be implementable in pure ISO C++. What do you think? Based on the discontent that the previous "parenthesized" syntax generated among Boosters, the key question is: Would you consider this new syntax usable?? Thanks, --Lorenzo

5 45

Review request: extended complex number library
by Matthieu Schaller 02 May '12

02 May '12

Dear all, Following the comments from V. Escriba, I formally propose my complex number library for review. The library is an extension of the std::complex class addressing two issues: - The standard does not guaranty the behaviour of the complex class if instantiated with types other than float/double/long double. - Some calculation where pure imaginary numbers (i.e. multiples of sqrt(-1)) appear are unnecessarily slowed down due to the lack of support for these numbers. The code I submit contains two interleaved classes boost::complex and boost::imaginary which can be instantiated with any type T provided T overloads the usual arithmetic operators and some basic (real) mathematical functions depending on which complex function will be used. It is thus an extended version of Thorsten Ottosen's n1869 proposal (http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1869.html) Performance tests show some non-negligible speed-ups compared to std::complex for calculations where pure imaginary numbers are involved. A speed-up of 25% has been observed when solving the Schroedinger equation explicitly on a regular mesh and some comparable figures can be observed when computing the Mandelbrot set (the two examples snippets provided in the archive). Furthermore, the functions (sin(), exp(), log(),...) involving boost::imaginary numbers are more precise than their equivalent using a std::complex with the real part set to 0. The code and (doxygen) documentation is available in the repository http://code.google.com/p/cpp-imaginary-numbers/ A comprehensive zip archive can be found in the "download" and the code can also be checked-out via the SVN repository. The archive contains the class header, two examples, a comprehensive precision test, a brute-force performance test and the documentation. I'd be happy to answer any question from your side and to provide more detailed information if required. Regards, Matthieu -- Matthieu Schaller PhD student - Durham University

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Re: [boost] Slow Bugs Tracker
by Olaf van der Spek 29 Apr '12

29 Apr '12

Hi, A few months ago there seemed to be plans to improve Trac. What's the status of those plans? Trac is still slow as hell. http://lists.boost.org/Archives/boost/2011/12/188639.php http://lists.boost.org/Archives/boost/2011/12/188937.php -- Olaf

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Boost.ntree_container (bi_tree, quad_tree, oct_tree, etc ptr containers) Is there any interest in this?
by Dan Walters 27 Apr '12

27 Apr '12

Hi all, I am proposing adding spacial containers for efficiently storing and accessing data of a spacial nature in fixed size trees. n-tree data structures would be useful where data relates to a 1D, 2D or 3D location, providing n-array searching of an n-array volume. N-tree data structures are commonly used in 3d applications, and are rarely particularly specialized. Their use is fundamental however they are frequently written by application programmers, due to a lack of free open source implementations (to the limit of my research). Their sophistication, like any container, is slim but easy to get wrong and beyond the ability and time contraints that should be assumed of the application programmer. It is a flexible and standard enough concept that a single implementation can be expected to meet a majority of requirements. I think there is the opportunity to create a solid implementation of templated n-tree pointer containers. The ntree container would be a tree representing an narray of elements with all dimensions being the same and being a power of two. The tree is memory efficient where areas within the volume are not occupied, and so "branches" and "leaves" are not created. The tree is well suited to geometrical operations such as ray picking or plane culling of the volume. An n-tree structure could be used in the place of any sparely populated n dimensional array where memory saving is the objective. The existing libraries I have found are licensed under GNU licenses. A ntree container should implement: get reset overloaded (array style) operators Optional implementations: views - a subset object representing an area or volume within the tree for accelerated access to a group of leaves that are positioned near to each other raycasting plane culling (getting leaves within a set of planes) etc. Is there interest in such a library? Many thanks, Dan

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[result_of] Make `cpp0x_result_of_impl` public
by Michel Morin 26 Apr '12

26 Apr '12

There are two implementations of boost::result_of: a TR1-style implementation and a decltype-based implementation. While the TR1-style implementation has a public interface `boost::tr1_result_of`, decltype-based one doesn't have a public interface. By defining BOOST_RESULT_OF_USE_DECLTYPE, boost::result_of use decltype-based implementation. But this is not always a viable solution, since this breaks some Boost libraries. So how about adding `boost::cxx11_result_of` as public interface of the decltype-based implementation? Attached a patch to add `boost::cxx11_result_of`. (This patch also changes the name of `cpp0x_result_of_impl` to `cxx11_result_of_impl` to reflect the recent discussion on the cpp/cxx naming.) P.S. Is it worth trying to use this `boost::cxx11_result_of` in `boost::transform_iterator` code on trunk? Regards, Michel

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[quickbook] controlling table of contents
by lcaminiti 14 Apr '12

14 Apr '12

Hello all, Is there a way for more fine control of QuickBook table of contents (toc)? Specifically, I'd like to: 1) Have a toc in the first page with only the sections (no subsections) listed. 2) Then, have a full toc on the second documentation page with all sections and subsections listed. I can use any rev of QuickBook for this. Thanks a lot. --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-quickbook-controlling-table-of-con… Sent from the Boost - Dev mailing list archive at Nabble.com.

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[typeof] registration question
by Cromwell Enage 14 Apr '12

14 Apr '12

Hi, folks! In emulation mode, given the following definition: template <typename Container> struct some_metafunction { typedef BOOST_TYPEOF_TPL( Container().insert( typename Container::iterator() , typename Container::value_type() ) ) type; }; Which of the following types need to be registered? 1. The argument passed as `Container` 2. The result of `typename Container::iterator` 3. The result of `typename Container::value_type`

3 7

[lockfree] tagged_ptr as a separate library
by Philipp Moeller 12 Apr '12

12 Apr '12

In the review of lockfree it has been suggested that tagged_ptr should make it into the public API of lockfree. Wouldn't it make sense to move it into a separate library entirely? It would possibly get more exposure and cross-platform ports. The technique itself also requires some extra documentation. And it might find it's way into a release earlier than lock-free itself. Philipp Moeller

5 7

[range] adaptors vs. rvalue to lvalue& binding
by Arno Schödl 11 Apr '12

11 Apr '12

Hello, ideally I would like to use range-adapted lvalue ranges like any other lvalue ranges. Writing it down naively, as below, does not compile because LoadRefRange takes (and should take?) the range it modifies by lvalue&, while adaptor expressions are rvalues. template<typename Range> void modifies_range( Range& rng ); A a[5]; main() { // modifies all elements of a modifies_range ( a ); // modifies all elements (except for one) of a // adaptor is rvalue, does not compile: modifies_range ( boost::range::join( boost::adaptors::slice( a, 0, 1 ), boost::adaptors::slice( a, 2, countof(a) ) ) ); // compiles, but ugly: auto rng=boost::range::join( boost::adaptors::slice( a, 0, 1 ), boost::adaptors::slice( a, 2, countof(a) ) ); modifies_range(rng); } Any thoughts? Should adaptors receiving lvalues offer an operator adaptor&() &&; // overload on rvalue-ness so they are passing through the lvalue or their argument? A suitable baseclass a la boost::additive could do that. Regards, Arno -- Dr. Arno Schödl | aschoedl(a)think-cell.com Technical Director think-cell Software GmbH | Chausseestr. 8/E | 10115 Berlin | Germany http://www.think-cell.com | phone +49 30 666473-10 | US phone +1 800 891 8091 Amtsgericht Berlin-Charlottenburg, HRB 85229 | European Union VAT Id DE813474306 Directors: Dr. Markus Hannebauer, Dr. Arno Schoedl

8 21

[config] unexpected explicit operators conversion on some compilers.
by Vicente J. Botet Escriba 10 Apr '12

10 Apr '12

Hi, Given the following explicit bool conversion template<typename Mutex> class unique_lock { public: explicit operator bool() const BOOST_NOEXCEPT I was expecting the following code to compile fail (note the int cast) boost::unique_lock<boost::mutex> lk0; int i = int(lk0); It fails with gcc-4.7.0, but compile with gcc-4.6.2 and clang-3.0 (I have not tested yet with msvc). When BOOST_NO_EXPLICIT_CONVERSION_OPERATORS is defined I use the bool safe idiom to emulate the conversion #if defined(BOOST_NO_EXPLICIT_CONVERSION_OPERATORS) typedef void (unique_lock::*bool_type)(); operator bool_type() const BOOST_NOEXCEPT; bool operator!() const BOOST_NOEXCEPT; #else explicit operator bool() const BOOST_NOEXCEPT; #endif and in this case the compile fail as desired. Do we need a new macro to state that even if explicit operators are provide, there are some unexpected conversions that could be introduced? Best, Vicente

1 1

Release branch open for new libraries?
by Marshall Clow 10 Apr '12

10 Apr '12

When will the release branch be open for new libraries (for 1.50)? The calendar on Boost.org shows no dates for 1.50 at all. Thanks! -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

3 8

[scope_exit] trunk tests fail on sun compiler
by lcaminiti 09 Apr '12

09 Apr '12

Hello all, I'm trying to get ScopeExit to work on Sun. 1) First it looked like all tests fail on this compiler: http://www.boost.org/development/tests/trunk/developer/scope_exit.html 2) However, I installed Solaris Studio 12.3 on my Ubuntu 10 and it seems that I can compile ScopeExit just fine with the following" $ CC -I /usr/include/i386-linux-gnu/ -I ../../.. -DBOOST_TYPEOF_EMULATION world_seq.cpp Note that: a) Sun does not support variadic macros so only ScopeExit sequence syntax will work. b) Sun does not support native type-of so BOOST_TYPEOF_EMULATION needs to be defined. Therefore, all original ScopeExit type-of emulation tests named `emulation_...` should compile (because they use the sequence syntax and define BOOST_TYPEOF_EMULATION). However, they fail... why? 3) Why when I click on the "fail" link for these tests I get no information on the Sun compiler's output? For example: http://www.boost.org/development/tests/trunk/developer/output/Sandia-sun-bo… If I follow this link I get "Error extracting file: No matching files were found.". What does this mean? Thanks a lot! --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-scope-exit-trunk-tests-fail-on-sun… Sent from the Boost - Dev mailing list archive at Nabble.com.

6 34

Nightly testing broken due to missing file
by Belcourt, K. Noel 07 Apr '12

07 Apr '12

error: Unable to find file or target named error: './sync/mutual_exclusion/locks/upgrade_lock/cons/ move_ctor_shared_lock_until_pass.cpp' error: referred from project at error: '../libs/thread/test'

3 2

[signals] [vc11] Compile Error (Ticket #1499)
by Joshua Boyce 04 Apr '12

04 Apr '12

The problem causing ticket #1499 is happening again under VC11. https://svn.boost.org/trac/boost/ticket/1499 Build scripts and logs: http://dl.dropbox.com/u/74751/cpp/boost/logs/msvc32-20120319-1118.bat http://dl.dropbox.com/u/74751/cpp/boost/logs/msvc64-20120319-1118.bat http://dl.dropbox.com/u/74751/cpp/boost/logs/msvc32-20120319-1118.txt http://dl.dropbox.com/u/74751/cpp/boost/logs/msvc64-20120319-1118.txt Bumping to check for _MSC_VER <= 1700 does the trick (tested locally). Patch: http://dl.dropbox.com/u/74751/cpp/boost/patches/signals-vc11-fix-20120319-1… Once this is applied the trunk compiles cleanly (well, no errors, there are still lots of warnings) using the VC11 beta. Thanks.

2 3

[git] Mercurial?
by Daryle Walker 02 Apr '12

02 Apr '12

Git has a competitor called Mercurial? If we're moving to a Distributed-VCS, should we go to Mercurial instead of Git? They're kind-of like CVS vs. Subversion, except I think they came up in parallel. (While Subversion was designed as an updated CVS.) I think Git was made up of a bunch of script hacks, while Mercurial was a regimented single program. I don't have a preference, but I want to make sure we consider the rival options. Daryle W.

48 236

[test] Use of namespace qualifier before floating point functions in boost/test/impl/execution_monitor.hpp
by Jeremiah Willcock 02 Apr '12

02 Apr '12

According to http://pubs.opengroup.org/onlinepubs/009604599/basedefs/fenv.h.html, operations such as feclearexcept can be defined as macros, and at least some versions of Glibc do that by default. The use of explicit :: qualifiers before calls to those in Boost.Test fails to compile. Is there a workaround for that (other than __NO_MATH_INLINES)? -- Jeremiah Willcock

1 1

[quickbook] coloring code syntax
by lcaminiti 02 Apr '12

02 Apr '12

Hello all, Is there a way to tell QuickBook code fragments to color words that are not C++ keyword for example in blue or in other colors? For example, in `int i = 0;` "int" is colored in blue. I'd like that in `requires Copyable<T>` "requires" is colored in blue (or some other color that I can specify). Thanks a lot! --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-quickbook-coloring-code-syntax-tp4… Sent from the Boost - Dev mailing list archive at Nabble.com.

3 2

[result_of] Test fails on clang trunk and gcc-4.7 due to changes in FDIS
by Michel Morin 01 Apr '12

01 Apr '12

In the code below, const int f(); decltype(f()) i = 0; `i` has type `int` (not `const int`) in C++11. This is because `f()` is a prvalue of a non-class type (i.e. `const int`) and so its cv qualifiers are ignored. C++0x drafts (before FDIS) had a special rule for function calls in decltype: if e is a function call or an invocation of an overloaded operator (parentheses around e are ignored), decltype(e) is the return type of the statically chosen function; but this was removed in FDIS. Clang-3.1 (which will be clang-3.1) and gcc-4.7 seem to have implemented this change, and this change breaks the test case (libs/utility/test/result_of_test.cpp) on those compilers in a C++11 mode. The following are the errors messages: [1] result_of_test.cpp:210:3: error: static assertion failed: (is_same<result_of<const result_of_member_function_template(double)>::type, const double>::value) [2] result_of_test.cpp:211:3: error: static assertion failed: (is_same<result_of<volatile result_of_member_function_template(double)>::type, volatile double>::value) [3] result_of_test.cpp:212:3: error: static assertion failed: (is_same<result_of<const volatile result_of_member_function_template(double)>::type, const volatile double>::value) [4] result_of_test.cpp:239:3: error: static assertion failed: (is_same<result_of<const volatile no_result_type_or_result_of(void)>::type, const unsigned short>::value) [5] result_of_test.cpp:244:3: error: static assertion failed: (is_same<result_of<const volatile no_result_type_or_result_of_template<void>(void)>::type, const unsigned short>::value) Regards, Michel

3 10

Status of proposed boost.overload?
by niXman 01 Apr '12

01 Apr '12

Hello list! boost.overload: http://svn.boost.org/svn/boost/sandbox/overload/ The library will be accepted into the boost libraries ? -- Regards, niXman

5 11

[container][memory] Request to move allocator_arg_t and uses_allocator to a memory related file.
by Vicente J. Botet Escriba 31 Mar '12

31 Mar '12

Hi, I want to add Allocators to the packaged_task and promise class of Boost.Thread template <class Allocator> promise(allocator_arg_t, const Allocator& a); template <class F, class Allocator> explicit packaged_task(allocator_arg_t, const Allocator& a, F&& f); I see that Boost.Container has already defined in namespace boost::container and in file boost/container/scoped_allocator.hpp the following struct allocator_arg_t { }; constexpr allocator_arg_t allocator_arg = allocator_arg_t(); template <class T, class Alloc> struct uses_allocator; I would like to shared these to all the Boost libraries. I don't think it is a good idea to make Boost.Thread depend on Boost.Container just for this. Could these declarations be included in a specific file? These declaration are included in <memory> in the C++11. What would be the best library to contain these declarations? What about a new boost/memory.hpp file? What about moving them to the boost or boost::memory namespace? Best, Vicente

2 5

[offtopic] C++Now! Room Reservation at Aspen Meadows
by Hartmut Kaiser 31 Mar '12

31 Mar '12

Hey all, If somebody needs a room reservation at the Aspen Meadows for C++Now in May, please get in contact with me offline. I have to cancel my trip and would like to avoid the cancellation penalty for my booked room. Regards Hartmut --------------- http://boost-spirit.com http://stellar.cct.lsu.edu

1 0

[guideline] 31 character filenames?
by Eric Niebler 30 Mar '12

30 Mar '12

Our current guidelines[1] say filenames should not exceed 31 characters. This was recently brought to my attention by a bug[2] from someone who actually cares because he uses the ODS-2 filesystem on OpenVMS. On a lark, I hacked the inspect tool to check for too-long filenames and lo! found a bazillion. Most (but not all) violations are from doc files auto-generated by doxygen and docbook, but which nevertheless go out with the boost distribution and so should conform. (Right?) So, should we care? Considering that we have little control(?) over how doxygen and docbook generate their files? I have fixed the bug in question, but it feels like a token effort. Should we just drop support for niche filesystems like ODS-2, and close all future bugs "won't fix"? [1] http://www.boost.org/development/requirements.html [2] https://svn.boost.org/trac/boost/ticket/6196 -- Eric Niebler BoostPro Computing http://www.boostpro.com

10 14

[Assign][GIL] Boost Assign and GIL incompatibility in gcc 4.3.2
by Andrew Hundt 29 Mar '12

29 Mar '12

The following source code compiles under clang 3.1, but fails under gcc 4.3.2 with boost version 1.46. It doesn't look like there are updates to either library in the boost news list since then. #include <vector> #include <boost/assign/std/vector.hpp> // for 'operator+=()' #include <boost/gil/gil_all.hpp> int main(int argc, char** argv){ using namespace boost::assign; std::vector<int> values; values += 1, 2, 3, 4; typedef boost::gil::rgb8_pixel_t pt; std::vector<pt> pixValues; pixValues += pt(1,2,3),pt(2,3,4); } ------------------------------------- Compiler versions: FAILED: gcc (SUSE Linux) 4.3.2 [gcc-4_3-branch revision 141291] Copyright (C) 2008 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. SUCCEEDED: Apple clang version 3.1 (tags/Apple/clang-318.0.54) (based on LLVM 3.1svn) Target: x86_64-apple-darwin11.3.0 Thread model: posix Cheers! Andrew Hundt

3 3

Arena/Linear allocators
by Olaf van der Spek 29 Mar '12

29 Mar '12

Hi, I'm looking for arena/linear allocators, for use with multi_index, unordered_map and others. Does Boost provide anything like this? There's Boost Pool, but it only provides a singleton pool allocator. -- Olaf

2 2

[contract] nothing special about nested classes
by lcaminiti 29 Mar '12

29 Mar '12

Hello all, In the _many_ Contract Programming references that I have read (including N1962): http://contractpp.svn.sourceforge.net/viewvc/contractpp/trunk/doc/html/cont… I didn't find anything special about contracts for nested classes. I think that is because nested classes are executed at run-time "orthogonally" with respect to their enclosing classes. In other words, nesting a class only nests it's name (and changes some visibility rules) but it does not effect the run-time execution of the class and therefore it does not affect the contracts checked for the nested class. For example, the execution of a nested class y should only check y's invariants and not also the invariants of its enclosing class x: #include <contract.hpp> #include <iostream> CONTRACT_CLASS( struct (x) // enclosing class ) { CONTRACT_CLASS_INVARIANT( std::cout << "x's invariant" << std::endl ) CONTRACT_CLASS( public struct (y) // nested class ) { CONTRACT_CLASS_INVARIANT( std::cout << "y's invariant" << std::endl ) CONTRACT_FUNCTION( public void (f) ( void ) ) {} }; }; int main ( void ) { x::y yy; yy.f(); // checks y's invariant but not x's invariant return 0; } In fact in this example an object of x is not even created. Of course, if y was to create or get an object of x and invoke x's member functions then x's contracts will be checked as usual. This makes sense to me but I thought to share it with the ML. Thanks. --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-contract-nothing-special-about-nes… Sent from the Boost - Dev mailing list archive at Nabble.com.

1 0

Boost Optional
by Rafael Justo 29 Mar '12

29 Mar '12

Hello! This is my first post in this list. =) I was looking today at Boost Optional (great work!). And I was wondering how could I do something like the bellow code. -------------------------------- #include <boost/optional.hpp> class Test {}; boost::optional<Test> get() { return boost::optional<Test>(); } int main() { if (get() == true) { // OK } else if (get() == false) { // ERROR } return 0; } -------------------------------- But there's no "operator==" with bool in optional.hpp, so the above code don't compile (i have checked version 1.49). Is it possible to add the patch described bellow in optional.hpp to solve this problem? -------------------------------- --- boost_1_49_0/boost/optional/optional.hpp 2010-12-18 19:29:39.000000000 -0200 +++ boost_1_49_0_new/boost/optional/optional.hpp 2012-03-28 16:03:53.417578997 -0300 @@ -616,6 +616,11 @@ return *this ; } + bool operator== (const bool condition) + { + return ((*this && condition) || (!*this && !condition)); + } + void swap( optional & arg ) { // allow for Koenig lookup -------------------------------- Best regards, Rafael Justo

4 4

using of circular_buffer
by news.gmane.org 28 Mar '12

28 Mar '12

Hello there, i am new here and i just want to say "hi". so, i'm using boost almost a year now, usually i just used the array component. latley i wanted to implement the circular_buffer. i've defined it in a class after the private-modifier like this: boost::circular_buffer<std::string> textBuffer(10); (as take from the documentation) but my compiler on minGW will throw an error. so, i guess i got something wrong in declaring a string-textbuffer with the lenght of 10?! in the boost-docs there is following example: boost::circular_buffer<int> cb(3); help is appreciated, best would be a working example and a little hint which information is may have missed. greetings tony

3 4

Fwd: [Boost-bugs] [Boost C++ Libraries] #380: Support for bundled properties in graph adaptors
by Marshall Clow 28 Mar '12

28 Mar '12

I just wanted everyone to notice that Jeremiah just closed a _seven year old_ bug in boost. -- Marshall Begin forwarded message: > From: "Boost C++ Libraries" <noreply(a)lists.boost.org> > Subject: Re: [Boost-bugs] [Boost C++ Libraries] #380: Support for bundled properties in graph adaptors > Date: March 28, 2012 1:47:03 PM PDT > Cc: boost-bugs(a)lists.boost.org > Reply-To: boost(a)lists.boost.org > > #380: Support for bundled properties in graph adaptors > -----------------------------------+---------------------------------------- > Reporter: dgregor | Owner: dgregor > Type: Bugs | Status: closed > Milestone: To Be Determined | Component: graph > Version: Boost Release Branch | Severity: Problem > Resolution: wontfix | Keywords: > -----------------------------------+---------------------------------------- > Changes (by jewillco): > > * status: reopened => closed > * resolution: => wontfix > > > Old description: > >> {{{ >> The graph adaptors (such as subgraph) do not support bundled >> properties, but they should. >> }}} > > New description: > > {{{ > The graph adaptors (such as subgraph) do not support bundled > properties, but they should. > }}} > > -- > > Comment: > > This is likely to work now, so closing as wontfix. Please reopen if the > problem still exists in the trunk version of Boost. > > -- > Ticket URL: <https://svn.boost.org/trac/boost/ticket/380#comment:7> > Boost C++ Libraries <http://www.boost.org/> > Boost provides free peer-reviewed portable C++ source libraries. > _______________________________________________ > Boost-bugs mailing list > Boost-bugs(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-bugs -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

2 1

DCVS vs CVS: call for constructivism
by Philippe Vaucher 28 Mar '12

28 Mar '12

Hello, I think we all know understood that there are people from both camps, some with emotional arguments, some with constructive arguments, but it's not really moving anywhere. We need to start listing what would have to be done and once we have such a map see if it's worth it before discussing pointless things. Just so we can redirect people saying things like "Nobody told me a real advantage yet" to this post, here's a recapitulation of what I think the advantages/disadvantages of a DCVS is ( http://www.ericsink.com/vcbe/html/dvcs_advantages.html, http://www.ericsink.com/vcbe/html/dvcs_weaknesses.html) Pro: - Offline work (you can use diffs, you can commit) - Speed of operations compared to svn - No need to setup a server to work locally (encourages participation (focus on working first, then sharing later)) Cons: - Cannot check out subpaths - Cannot lock files - Would require people to change their habits and learn new tools I think most people in the svn-camp will tell that with the 1.8 checkpoints feature you can now also commit while offline and thus the only advantages for DCVS seems to be speed and the ability to check all the data while offline. I think the people that are opposed to the change unfortunately won't be convinced by those arguments, even tho pretty much every who switched to DCVS will tell you that the advantages are worth it and it's more than simply speed or freedom, it's a philosophy etc. So I think the best thing to do now is first to make a map of what would have to be done if we decided to switch, to see if it's an option at all. Here's a simple draft, please participate into making it better: - Import current history - Migrate the existing hooks - Migrate the existing scripts around. - Migrate the test runners - Trac / Website integration (redmine with git extensions?) - Rights management (gitolite?) - Update release procedures Maybe we'd start a page on the wiki, but the idea is to find out if there are more steps to be done and if there's any showstopper in those steps. I think the best solution would be to offer the repository with several protocols, namely git/hg/svn so everyone could use the tool they want (e.g github offers svn/git, I know other hosts do it too). Philippe

10 19

[Lockfree] Small compilation error with gcc -Wall
by Julien Nitard 28 Mar '12

28 Mar '12

Hi all, The following code seems to generate an "unused variable" variable warning with g++ -Wall. I am working on the latest version available from git, though I am not sure if this version is relevant. #include <boost/lockfree/fifo.hpp> typedef boost::lockfree::fifo<ReplicateData, boost::lockfree::static_freelist_t> Queue; Queue _buffer(4096); It occurs in fifo.hpp at line 263. Replacing tagged_node_ptr head2 = head_.load(memory_order_relaxed); By head_.load(memory_order_relaxed); Seems to do the job. Many thanks, Julien

2 1

Boost Fusion suggestion
by Pavel Bažant 28 Mar '12

28 Mar '12

I am not actually a Boost developer, but have the following suggestion regarding boost.fusion: I find the macro BOOST_FUSION_DEFINE_STRUCT potentially very useful, but it does not provide means to influence the initialization list of the default constructor. Alternatively, means to emulate c++11 default initialization (the struct Foo {int x=10;} syntax) could be emulated. Such feature would be very useful, as it would minimize repetition and make it easier to ensure that uninitialized variables are nowhere used. I already generate my structs from BOOST_PP sequences in a similar way to BOOST_FUSION_DEFINE_STRUCT to avoid having to write json serialization boilerplate, but a variant of BOOST_FUSION_DEFINE_STRUCT i am suggesting would make this task even simpler. Pavel Bazant

2 1

[functional] [overloaded_function] polymorphic functions?
by Lorenzo Caminiti 27 Mar '12

27 Mar '12

Hello all, I spent some time trying to make overloaded_function support polymorphic functions but I had little success :( 1) I was able to do this (see code below): overloaded_function< void (int) , functor<poly, void (generic)> > o(f, p); o(321); o(3.21); o("cba"); But I don't like it because I explicitly have to pass the functor type poly. I wanted instead to only use generic to tag the template parameters in the signature: overloaded_function< void (int) , void (generic) > o(f, p); o(321); o(3.21); o("cba"); I'd consider this acceptable but I wasn't able to program this because I loose p's type (poly) in base so base cannot hold a reference to the functor p... Is there a way around this? (Some type-erasure magic maybe??) 2) I don't think this can work with function templates because in order to get a pointer to a function template you have to instantiate it: g<char*> Now I can get the function pointer but it's not polymorphic anymore... 3) I don't think there is any way to implement make_overloaded_function with polymorphic types because I can't re-construct the function signature from the functor given that its operator contains template parameters... I have no idea on how to work around this... If you have suggestions for 1, 2, or 3), they are welcome. Otherwise, it seems that supporting polymorphic functions in overloaded_function is not really feasible... The little I got so far: #include <boost/function.hpp> #include <boost/type_traits/function_traits.hpp> #include <iostream> void f(int x) { std::cout << x << std::endl; } template<typename T> void g(T x) { std::cout << x << std::endl; } struct poly { template<typename T> void operator()(T x) { std::cout << x << std::endl; } }; template<typename F> struct base { template<typename G> base(G g) : f_(g) {} typename boost::function_traits<F>::result_type operator()( typename boost::function_traits<F>::arg1_type arg1 ) { return f_(arg1); } private: boost::function<F> f_; }; struct generic; template<typename Ftor, typename F> struct functor; template<typename Ftor, typename R> struct base< functor<Ftor, R (generic)> > { base(Ftor& ftor) : ftor_(ftor) {} template<typename Arg1> R operator()(Arg1 arg1) { return ftor_(arg1); } private: Ftor& ftor_; }; template<typename F1, typename F2> struct overloaded_function : base<F1>, base<F2> { template<typename G1, typename G2> overloaded_function(G1 g1, G2 g2) : base<F1>(g1), base<F2>(g2) {} using base<F1>::operator(); using base<F2>::operator(); }; int main() { f(123); g("xyz"); boost::function<void (char*)> gg = g<char*>; poly p; p(1.23); p("abc"); overloaded_function< void (int) , functor<poly, void (generic)> > o(f, p); o(321); o(3.21); o("cba"); return 0; } Thanks a lot. --Lorenzo

4 5

[git] What's the IDE picture like?
by Rene Rivera 27 Mar '12

27 Mar '12

All this talk about switching to git brings up one important question for me, and I suspect others.. Given all the various git-flow, git-this, git-that, git-whatever, tools that are getting mentioned.. What is the process for a user that wants to do their development, including version control, like? Specifically what does an: * Eclipse user do? * Xcode user do? * VIsualStudio user do? I ask because I'm really tired of learning yet more command lines tools at this stage in my life. And even though all GUI tools have drawbacks they do have the advantage that they condense the workflow usages to something understandable. And I would be really hard pressed to use any new version control system that I can't use a GUI. And preferably an integrated GUI. -- -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com -- 102708583/icq - grafikrobot/aim - grafikrobot/yahoo

9 12

[move] explicit moving from a rvalue
by Vicente J. Botet Escriba 27 Mar '12

27 Mar '12

Hi Ion, With the current emulation of move semantics of Boost.Thread using Boost.move, I have a case that I would like to make working in a portable way boost::thread t = boost::thread( MoveOnly()); The library declares the template move constructor from a movable callable as as follows template <class F> explicit thread(boost::rv<F>& f); and MoveOnly is declared as defined below. The problem is a know limitation as the compiler is unable to deduce F as been MoveOnly even if MoveOnly is convertible to boost::rv<MoveOnly>& Jeffrey Lee Hellrung, Jr. made a proposal to try to solve the issue, but his proposal has a performance penality. Here it is a less elegant but efficient enough alternative. The addition of a explicit move conversion as ::boost::rv<MoveOnly>& move() { return *static_cast< ::boost::rv<MoveOnly>* >(this); } allows to the following to work as expected boost::thread t = boost::thread( MoveOnly().move()); While this workaround works when we are using the emulation it doesn't works when rvalue references are supported. I have defined a macro BOOST_EXPLICIT_MOVE that allows to write portable code #if ! defined BOOST_NO_RVALUE_REFERENCES #define BOOST_MOVE(RVALUE) RVALUE #else #define BOOST_MOVE(RVALUE) RVALUE.move() #endif that can be used as boost::thread t = boost::thread( BOOST_MOVE(MoveOnly())); The move() function is not really needed as the macro can hide the needed conversion, but could be preferred by users that don't need to make portable programs. The evident liability is of course the use of the macro. Is there something wrong on this design, something to to improve? The same design can be used on compilers, such as as SunStudio (see https://svn.boost.org/trac/boost/ticket/6222) that prefer the overload of a private copy constructor to an public move constructor. On these kind of compilers the following overload private: MoveOnly(MoveOnly&); public MoveOnly(boost::rv<MoveOnly>&) makes the following to fail at compile time MoveOnly MakeMoveOnly() { return MoveOnly(); } but MoveOnly( MakeMoveOnly(() { return BOOST_MOVE(MoveOnly()); } will work. Do you think that member functions as the explicit move() and a macro as BOOST_MOVE can be added to Boost.Move emulation? Best, Vicente ///////////////////////////// class MoveOnly { #ifndef BOOST_NO_DELETED_FUNCTIONS public: MoveOnly(const MoveOnly&)=delete; MoveOnly& operator=(MoveOnly const&); #else private: MoveOnly(MoveOnly&); MoveOnly& operator=(MoveOnly&); public: #endif MoveOnly() { } #ifndef BOOST_NO_RVALUE_REFERENCES MoveOnly(MoveOnly&&) {} #else #if defined BOOST_THREAD_USES_MOVE MoveOnly(boost::rv<MoveOnly>&) {} MoveOnly& operator=(boost::rv<MoveOnly>&) { return *this; } operator ::boost::rv<MoveOnly>&() { return *static_cast< ::boost::rv<MoveOnly>* >(this); } operator const ::boost::rv<MoveOnly>&() const { return *static_cast<const ::boost::rv<MoveOnly>* >(this); } ::boost::rv<MoveOnly>& move() { return *static_cast< ::boost::rv<MoveOnly>* >(this); } const ::boost::rv<MoveOnly>& move() const { return *static_cast<const ::boost::rv<MoveOnly>* >(this); } #else #error #endif #endif void operator()() { } };

3 5

[quickbook] Controling the layout of table columns in docbook/fo output
by Andreas Pokorny 27 Mar '12

27 Mar '12

Hi, In an earlier thread I mentioned that I am using quickbook to write software design specification/documentation. The whole document grows nicely now. Since more people are contributing, I added howto chapters to the end of the document, including some kind of guided quickbook skeleton for new chapters and the quickbook documentation itself. The quickbook documentation creates warnings with fop: Mar 12, 2012 8:11:46 PM org.apache.fop.events.LoggingEventListener processEvent WARNING: table-layout="fixed" and column-width unspecified => falling back to proportional-column-width(1) (See position 1686:869) Mar 12, 2012 8:11:46 PM org.apache.fop.events.LoggingEventListener processEvent WARNING: table-layout="fixed" and column-width unspecified => falling back to proportional-column-width(1) (See position 1686:905) Mar 12, 2012 8:11:46 PM org.apache.fop.events.LoggingEventListener processEvent WARNING: table-layout="fixed" and column-width unspecified => falling back to proportional-column-width(1) (See position 1896:796) and more. That happens for every table. Inside the documentation about tables there one containing hello world source. There the proportional column width makes the source code leave the table and text area of the page. Is there a yet undocumented way to control column sizes? regards Andreas

2 4

Re: [boost] [utility] Adding noexcept to boost::declval
by Michel Morin 27 Mar '12

27 Mar '12

Vicente J. Botet Escriba wrote >> Summary: >> Defining declval<T>() as add_lvalue_reference<T>::type is wrong; >> add_lvalue_reference should be removed! >> >> > There is something that disturb me by returning just T, doesn't this forces > the type T to CopyConstructible? Nope. T needs not to be CopyConstructible (Note that declval can be used only in unevaluated contexts.) > The idea to use T& instead was to avoid > this. You shouldn't do this, because this transforms rvalues to lvalues. > I have rolled back at revision 77562. Thanks, Vicente! Minor issue: `#include <boost/type_traits/add_lvalue_reference.hpp>` is not removed yet. Regards, Michel

2 1

[filesystem] Heads up; filesystem in trunk unstable while V2 removed
by Beman Dawes 26 Mar '12

26 Mar '12

To ensure that history is preserved, the removal of version 2 will be done as three commits. Filesystem in trunk will be unstable during until all three commits are completed. Hopefully this will take less than an hour. I'll post a notice when complete. --Beman

3 7

[gsoc]
by Andrew Sutton 26 Mar '12

26 Mar '12

It looks like there will be no summer of Code for Boost this year. For whatever reason, Google has decided not to accept Boost as a mentoring organization. Andrew

10 18

Re: [boost] [utility] Adding noexcept to boost::declval
by Michel Morin 26 Mar '12

26 Mar '12

(Forgot to send to the list; now back to the list again.) Vicente J. Botet Escriba wrote: > OK, I will rollback it and analyze the breaking change. The important thing is that declval<T>() should preserve the constness/non-constness and the rvalueness/lvalueness of T. Essentially, it's OK to define declval<T>() as simply T. Then, why declval<T>() is defined as add_rvalue_reference<T>::type? This is because * When declval<T>() is defined as T, we cannot use abstract types as T. * When declval<T>() is defined as T&&, we cannot use void as T. The definition with add_rvalue_reference<T>::type also allows to use incomplete types as T. In C++03, it is not possible to construct rvalues of abstract types or incomplete types. So, the correct way to define declval<T>() in C++03 is to just use T. And this is the definition of declval<T>() in the previous version of boost::declval when BOOST_NO_RVALUE_REFERENCES is defined. Summary: Defining declval<T>() as add_lvalue_reference<T>::type is wrong; add_lvalue_reference should be removed! Regards, Michel

1 0

Re: [boost] [gsoc]
by Andrzej Krzemienski 26 Mar '12

26 Mar '12

> From an outside point of view, i do agree. I don't see a lot of Boost GSOC > projects completed. And that's really disapointing. > In my fileds of interests, i would love to see some libraries integrated > that deals with : > - large integer / large fixed point computation > - json parser/ writer > - xml parser/ writer like pugiwml > - crossplatform async file io for boost asio (not only for windows) > - xmpp/sip stack Boost does provide parsers and writers for JSON and XML files. See http://www.boost.org/doc/libs/1_49_0/doc/html/property_tree.html. Regards, &rzej

2 1

how to mark a test "fail*"
by lcaminiti 25 Mar '12

25 Mar '12

Hello all, Expected regression test failures are marked with "fail*" and give an explanation for why the failure is expected: http://www.boost.org/development/tests/trunk/developer/output/Sandia-intel-… How do I add an explanation for a new expected failure? Is there some documentation on this process? For example, emulation_this and emulation_this_tpl are expected to fail on MSVC8 and the user should use native type-of for those-- how do I add a link with such explanation the regression test table? http://www.boost.org/development/tests/trunk/developer/output/VC8%20jc-bell… http://www.boost.org/development/tests/trunk/developer/output/VC8%20jc-bell… Thanks a lot! --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-how-to-mark-a-test-fail-tp4503985p… Sent from the Boost - Dev mailing list archive at Nabble.com.

2 1

[mpi] all_reduce and MPI_IN_PLACE like feature
by Alain O Miniussi 25 Mar '12

25 Mar '12

Hi, MPI_Allreduce offers the possibility to use the same buffer for the send and recv data: http://www.open-mpi.org/doc/v1.4/man3/MPI_Allreduce.3.php#toc8 It seems that boost's all_reduce does not allow such a feature. First, I would like to know if the previous statement is correct and, if yes, if it was just overlooked or if there was a reason for that? Just in case, I filed a ticket regarding that issue, along with a tentative patch, in https://svn.boost.org/trac/boost/ticket/6704 Regards, Alain

1 0

Using C++11 lambdas to replace Phoenix in MPL expressions
by Augustus Saunders 25 Mar '12

25 Mar '12

I use Phoenix to essentially turn code into types which can then be manipulated through MPL. I mostly use this to conditionally select algorithms or to include/exclude code at compile time, based on some logic written with MPL. I was interested in writing the code fragments using the new C++11 lambda expressions as it gives a more natural way to write code. While you can get the type of a lambda expression with decltype, the problem I've run into is instantiating the resultant type in order to actually get the function to execute. Lambdas have no default constructor, which makes sense, as there would be no way to deal with the capture variables. So I'm wondering if anybody can shed some light on manually instantiating lambdas. I would think there is a way (possibly shady) to do this, at least for lambdas with no capture. Then passing around lambda types as template parameters would be useful, which I think would lead to many interesting results. I only get the digest, so it I would appreciate it if you CC me on any response. Thanks- Augustus

3 6

[lexical_cast][random] ADL problem with gcc c++11
by Joel de Guzman 25 Mar '12

25 Mar '12

Hi, I can't get this to compile on gcc-4.6.1 with -std=c++0x flag: #include <boost/random.hpp> int main() { return 0; } I'm getting an error in lexical_cast: C:\dev\boost/boost/lexical_cast.hpp:1323:120: error: there are no arguments to 'swprintf' that depend on a template parameter, so a declaration of 'swprintf' must be available [-fpermissive] Obviously, I can compile with -fpermissive, but I'd like to report this anyway. Regards, -- Joel de Guzman http://www.boostpro.com http://boost-spirit.com

5 7

Re: [boost] [git] Mercurial?
by David Greene 25 Mar '12

25 Mar '12

Edward Diener <eldiener(a)tropicsoft.com> writes: >> Also back to the point - DVCS are written to provide best possible >> support for merging. This makes 1) or 2) you propose above very >> efficient. In SVN or other centralized systems it is not so, just look >> up the bit I left from Joel's message above. > > I do not believe for even a second that any product can do merging of > the same source file automatically and flawlessly. This strawman keeps resurfacing. No one has claimed than any VCS can avoid manual merging at times. A centralized VCS needs to operate as you outlined: >> Bu how is this different from: >> >> 1) Creating a local SVN repository and importing some branches from >> another SVN repository. >> >> and/or >> >> 2) Having one's own branch of an SVN repository as one's own. #1 is a horribly manual operation. I don't know if you quite grasp how complicated it is. I've been doing it for years. Getting the history preserved correctly is not trivial. #2 has almost no support in SVN. Now that SVN has merge tracking it is marginally better but there are problems with this model. Foremost, the branch has to be in a centralized repository and everyone owkring on the project has to deal with it in some fashion. It's not private in any sense of the word. You can't work on it if you don't have 'net access. You can't back out changes that you realized later were bad and ensure no one else ever sees those changes. The difference with a DVCS is both #1 and #2 are natively supported in the tool. There is no difference between a private local branch, a remote branch in a _de_facto_ central repository and a remote branch in some other random repository. They all look and act the same. I admit it is a tough concept to grasp for someone not used to it. It took me some time to grok it. But now it is second-nature to me and there's no way I'm going back. -Dave

3 4

[config] Why does BOOST_NO_STD_LOCALE imply BOOST_NO_STD_WSTREAMBUF?
by Yechezkel Mett 25 Mar '12

25 Mar '12

I have found the following in config/suffix.hpp: // // We can't have a working std::wstreambuf if there is no std::locale: // # if defined(BOOST_NO_STD_LOCALE) && !defined(BOOST_NO_STD_WSTREAMBUF) # define BOOST_NO_STD_WSTREAMBUF # endif What is the reasoning behind this? My problem is that I am using Windows CE 6.0 with the supplied standard library, and it has no <locale>, yet still seems to provide a working wstreambuf. The effect is that I can't get boost::wformat, which is annoying, considering that the WinCE API uses only wide characters. I have checked that removing this line works. Is there any way to undefine BOOST_NO_STD_WSTREAMBUF without modifying the source? Yechezkel Mett

1 0

Re: [boost] [Boost-commit] svn:boost r77506 - in trunk: boost/property_map libs/property_map/doc libs/property_map/test
by Michel Morin 25 Mar '12

25 Mar '12

> Author: jewillco > Date: 2012-03-23 15:35:52 EDT (Fri, 23 Mar 2012) > New Revision: 77506 > URL: http://svn.boost.org/trac/boost/changeset/77506 […] > --- (empty file) > +++ trunk/boost/property_map/function_property_map.hpp 2012-03-23 […] > +#ifndef BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_H > +#define BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_H […] > +#endif /* BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_H */ s/H/HPP > +template<typename Func, typename Key, typename Ret = typename boost::result_of<Func(Key)>::type> > +class function_property_map: public put_get_helper<Ret, function_property_map<Func, Key, Ret> > { […] > + typedef Ret reference; […] > + reference operator[](const Key& k) const { > + return f(k); > + } > + > + reference operator[](const Key& k) { > + return f(k); > + } […] > + private: > + Func f; > +}; In const version of the subscript operator, `f` is treated as `const Func`. So `reference` might not be appropriate for its return type. You can avoid this issue by making `f` mutable. Or, how about defining the default template argument of `Ret` as `boost::result_of<const Func(Key)>::type` and removing non-const version of the subscript operator? (Since property maps are often passed around by values, it makes less sense to allow stateful functors in `function_property_map`, IMHO.) Regards, Michel

2 2

Re: [boost] Please advise: Boost with LLVM Clang and 0x11 dialect ?
by Steve Ramsey 24 Mar '12

24 Mar '12

On Mar 21, 2012, at 1:35 AM, "John M. Dlugosz" <mpbecey7gu(a)snkmail.com> wrote: > Can someone please advise on how to get Boost headers to work when compiling using Clang (as found on Apple OSX/iOS development) when the 0x11 dialect is enabled? > > We're stuck at Boost 1.47 because 1.48 doesn't even work with the current settings (C++03 dialect). The Mac developers don't want to fiddle with 1.49 without knowing what the deal is. > > Is there someone who has used Boost on the Apple with Clang who can relate some tales of how it works and offer suggestions? I've had no luck on the Boost.Users mailing list, or a previous post here on Boost.Devel. Is there anyplace else I might ask? At this point, any scrap of wisdom would be appreciated. It's not an automatic process, but once the initial effort is spent, it works beautifully. I should point out that I use both C++11 and libc++, and I ended up making a number of changes to boost build files to get various features working. The biggest problem is the lack of support in tools/build/v2/tools/clang-darwin.jam for specifying the SDK/platform for cross-compiling. My solution since boost 1.47 has been to replace it with a modified copy of tools/build/v2/tools/darwin.jam; if I thought this was going to be an issue for anywhere near as long as it has, I would've sent in a patch half a year ago (aside: do any of the maintainers actually use boost on OS X?). An additional complication is that as of Xcode 4.3, variant toolchains are stored in a different location and use a slightly different directory structure; a nice solution would be to support a build feature to indicate this and respond accordingly; I just hardcode for Xcode 4.3+. I'm happy to send you diffs off-list if you're interested, but it's frankenhacks all the way down until I get around to making a clean patch file for clang-darwin.jam. Steve P.S. The only source/header file with a problem is libs/signals/src/named_slot_map.cpp, which is trivially fixable.

2 1

[filesystem] [svn] How to remove V2 files without loss of V3 history?
by Beman Dawes 24 Mar '12

24 Mar '12

The boost/filesystem directory currently looks like this: v2 config.hpp // actual header convenience.hpp exception.hpp fstream.hpp operations.hpp path.hpp v3 config.hpp // actual header convenience.hpp exception.hpp fstream.hpp operations.hpp path.hpp config.hpp // forwards to v2/config.hpp or v3/config.hpp convenience.hpp exception.hpp fstream.hpp operations.hpp path.hpp It is time to remove the dual version support. What I'd like to do is: * create a branch, * switch to it, * delete the top level forwarding headers, * move the v3 headers up to boost/filesystem, * delete the v2 and v3 directories, * modify the headers as needed, * merge back to trunk. At the completion of the merge, the history for the boost/filesystem headers should include the full history of what were the boost/filesystem/v3 headers. What are the svn commands to accomplish that? Thanks, --Beman

6 15

[utility] Adding noexcept to boost::declval
by Michel Morin 24 Mar '12

24 Mar '12

Now that we have BOOST_NOEXCEPT macro, it is reasonable to add noexcept to boost::declval (by means of BOOST_NOEXCEPT). As a note, std::declval is marked as noexcept. I made a ticket with a patch here: https://svn.boost.org/trac/boost/ticket/6570 If it looks sensible, could someone apply the patch? Regards, Michel

1 1

interprocess with unordered_map
by Joel Young 23 Mar '12

23 Mar '12

>> Folks, I've built a unordered_map in a memory mapped file. The map goes from: typedef boost::interprocess::allocator< char, boost::interprocess::managed_mapped_file::segment_manager > char_allocator_t; typedef boost::interprocess::basic_string< char, std::char_traits<char>, char_allocator_t > typedef std::pair< key_type, pay_type> val_type; typedef boost::interprocess::allocator< val_type, boost::interprocess::managed_mapped_file::segment_manager> allocator_t; typedef boost::unordered_map< key_type, pay_type, boost::hash<key_type>, std::equal_to<key_type>, allocator_t> map_type; Everything works fine on creation. But when I later go to read from the map in a different program where the mapped file is opened read only, I have to do gymcrackery like: // A temporary string that allocates from the mapped file struct shm_clean { // cleanup shared memory on stack-unwind shm_clean() { boost::interprocess::shared_memory_object::remove("StupidSharedMemory"); } ~shm_clean() { boost::interprocess::shared_memory_object::remove("StupidSharedMemory"); } } cleaner; boost::interprocess::managed_shared_memory stupid(boost::interprocess::create_only ,"StupidSharedMemory" ,500); key_type key_val(stupid.get_segment_manager()); to create a temporary to allow me to search since the maps find() method will only take a key_type and interprocess::basic_string WILL NOT implicitly construct from a std::string, nor will it implicitly construct from a char* to itself. Can the interprocess::basic_string be modified to allow these conversions? I hate having to do: key_val = "fruitcake"; db.find(key_val); Suggestions? Thanks! Joel

4 18

[config] PGI config file doesn't defines BOOST_HAS_THREADS
by Vicente J. Botet Escriba 23 Mar '12

23 Mar '12

There is an issue on Boost.Thread regression test for PGI compiler. See https://svn.boost.org/trac/boost/ticket/6354. "pgCC" -INLINE:none -Kieee -fpic -fPIC -gopt -Minform=warn -DBOOST_ALL_NO_LIB=1 -DBOOST_TEST_NO_AUTO_LINK=1 -DBOOST_THREAD_POSIX -DBOOST_THREAD_USE_DLL=1 -D__need_IOV_MAX -I".." -c -o "/scratch/kbelco/boost/results/boost/bin.v2/libs/thread/test/test_barrier.test/pgi-11.9/debug/threading-multi/test_barrier.o" "../libs/thread/test/test_barrier.cpp" "../boost/config/requires_threads.hpp", line 86: catastrophic error: #error directive: "Compiler threading support is not turned on. Please consult your compiler's documentation for the appropriate options to use" # error "Compiler threading support is not turned on. Please consult your compiler's documentation for the appropriate options to use" boost/config/compiler/pgi.hpp defines BOOST_HAS_PTHREADS but not BOOST_HAS_THREADS, resulting in failure in the requires_threads.hpp header. It seems that adding #define BOOST_HAS_THREADS inboost/config/compiler/pgi.hpp solves the issue. John, what do you think? Could I add it? Best, Vicente

3 5

Re: [boost] DCVS vs CVS: call for constructivism
by Gottlob Frege 23 Mar '12

23 Mar '12

I have a question for the git (or hg) people. Maybe the concrete situation will shed some light on some of the issues (or maybe I'll just get some help and stop pulling what's left of my hair out). I'm working on code.cpp and morecode.cpp. At the same time, I am writing scripts like review.sh (makes git work better with code collaborator) and, say, custom_make.bat. I am going back and forth on these as needed. In particular, as the cpp files get in shape I commit, and maybe post something for review. We leads me to change review.sh. Or as I get things working, I modify custom_build.bat. To me, once done, these are separate commits/branches/features/changelists (whatever you want to call them). But while working on them, I don't want to flip between branches - I find I'm always changing something in the wrong branch when I try separate branches. ie I change code.cpp while in the "scripts" branch. And it is often more than 2 things I am working on. And sometimes (not usually) they are at least somewhat related - ie code.cpp depends on yourstuff.h, and I need to make a small fix in yourstuff.h. In the end, that fix will be separate, but until i know it is correct, it tends to stay mixed with my other work. Now maybe the dependency case is different, I don't know. (obviously at the end of the day, the order of dependent changes needs to be pushed correctly). So basically, in something like perforce, I can group the files into changelists, and then forget about it until something is completely done and ready to commit. I understand I'm losing other features (small commits, being able to easily set it all aside, etc), but this is my common workflow. Should I do everything on a messy "work" branch and just sort it out when I am ready to push? Should I keep the features in separate branches, but pull from branch to branch all the time? (I don't think I want to spend that much time with the RCS. I like forgetting about it most of the time.) Am I just doing it wrong? (And did any of this make any sense?) Tony Sent from my portable Analytical Engine

5 4

[typeof] MSVC errors on PGI?
by lcaminiti 23 Mar '12

23 Mar '12

Hello all, I'm getting compiler errors when using Boost.Typeof on PGI (plus these errors seems to be from Boost.Typeof for MSVC?). It's the first time I try to use PGI... what am I doing wrong? // File: 01.cpp #include <boost/typeof/typeof.hpp> int main() { int x = 0; BOOST_TYPEOF(x) y = x; return y; } $ pgcpp -I ../../.. 01.cpp "../../../boost/typeof/msvc/typeof_impl.hpp", line 150: error: class "boost::type_of::msvc_extract_type<ID>::id2type [with ID=ID]" cannot be defined in the current scope struct base_type::id2type // This uses nice VC6.5 and VC7.1 bugfeature ^ "../../../boost/typeof/msvc/typeof_impl.hpp", line 160: error: incomplete type is not allowed typedef typename id2type::type type; ^ detected during instantiation of class "boost::type_of::msvc_typeid_wrapper<ID> [with ID=5]" at line 6 of "01.cpp" 2 errors detected in the compilation of "01.cpp". BTW, I'm trying to use PGI to get ScopeExit regression tests to all pass on this compiler. PGI users-- any help is welcome! --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-typeof-MSVC-errors-on-PGI-tp449921… Sent from the Boost - Dev mailing list archive at Nabble.com.

1 0

René Eng möchte chatten
by René Eng 23 Mar '12

23 Mar '12

----------------------------------------------------------------------- René Eng möchte einige der neuen Google-Produkte verwenden, um mit Ihnen besser in Kontakt zu bleiben. Wenn Sie schon Google Mail oder Google Talk verwenden, besuchen Sie: http://mail.google.com/mail/b-4122791ae-68c38cb068-RejaciDzcqGQypwAD-y35NwA… Klicken Sie auf diesen Link, um mit René Eng chatten zu können. Um Google Mail - ein kostenloses E-Mail-Konto von Google mit mehr als 2800 Megabyte Speicherplatz - zu erhalten und mit René Eng zu chatten, besuchen Sie: http://mail.google.com/mail/a-4122791ae-68c38cb068-RejaciDzcqGQypwAD-y35NwA… Google Mail bietet: - Instant Messaging direkt in Google Mail - Leistungsstarken Spamschutz - Integrierte Suche nach E-Mails und praktische Möglichkeiten, E-Mails in "Konversationen" zu ordnen - Keine Pop-up-Anzeigen oder nicht zielgerichtete Banner - nur Textanzeigen und Informationen, die für den Inhalt Ihrer E-Mails relevant sind Alle diese Funktionen erhalten Sie kostenlos. Aber das ist noch nicht alles! Wenn Sie sich für ein Google Mail-Konto registrieren, erhalten Sie auch Zugriff auf Google Talk, den Instant Messaging-Dienst von: http://www.google.com/talk/intl/de/ Google Talk bietet: - Einen webbasierten Chat, den Sie überall verwenden können, ohne dass ein Download erforderlich ist - Eine mit Ihrem Google Mail-Konto synchronisierte Kontaktliste - Kostenlose, qualitativ hochwertige Sprachanrufe von Computer zu Computer, wenn Sie den Google Talk-Client herunterladen Von Zeit zu Zeit fügen wir immer wieder neue Funktionen zu Google Talk hinzu und nehmen weitere Verbesserungen vor, weshalb wir Sie möglicherweise regelmäßig um Kommentare und Vorschläge bitten. Wir danken Ihnen für Ihre Hilfe bei der Optimierung unserer Produkte! Vielen Dank! Ihr Google Team Weitere Informationen zu Google Mail und Google Talk erhalten Sie unter: http://mail.google.com/mail/help/intl/de/about.html http://www.google.com/talk/intl/de/about.html Wenn das Klicken auf die URLs in dieser E-Mail nicht funktioniert, kopieren Sie sie und fügen Sie sie in die Adressleiste Ihres Browsers ein.

1 0

Looking for some "real world" extended precision integer arithmetic tests
by John Maddock 23 Mar '12

23 Mar '12

Folks, I'm continuing to add to the multiprecision arithmetic library in the sandbox (under "big_number"), and I've just added a Boost licensed fixed-precision integer type which on Win32 at least looks to be very competitive with GMP for reasonable numbers of bits (up to about 1024), see http://svn.boost.org/svn/boost/sandbox/big_number/libs/multiprecision/doc/h… However, as we all know there are lies damn lies and performance stats ;-) Plus the test results I have above ignore the effect of memory allocations (needed by libtommath and GMP, but not the fixed_int code - which in theory should make it faster still). So I'd be really interested to put the type through it's paces with some real world code that really thrashes an extended precision integer type. Any suggestions? Anything in Boost? Thanks in advance, John.

5 38

[Context] Compile Broken for MSVC under x64 (r77477 Trunk)
by Joshua Boyce 23 Mar '12

23 Mar '12

r77477 has broken compilation of Boost.Context on trunk for me when using MSVC and targeting x64 (it spits out a "platform not supported" error). I believe this is because MSVC does not define any of the preprocessor directives that are being checked now (instead of _WIN64). I believe the fix for this is to check _M_AMD64 and/or _M_X64. http://msdn.microsoft.com/en-us/library/b0084kay(v=vs.110).aspx _M_X64: Defined for x64 processors. _M_AMD64: Defined for x64 processors. This patch fixes the issue for me: http://dl.dropbox.com/u/74751/cpp/boost/patches/context-msvc-x64-fix-201203… Thanks.

1 0

[algorithm] aesthetic question about cxx11
by lcaminiti 22 Mar '12

22 Mar '12

Hello all, I have an aesthetic question. Boost.Algorithm puts C++11 algorithms like all_of into a directory boost/algorithm/cxx11. Would the directory name boost/algorithm/cpp11 be preferred? I think for file names .cpp and .hpp are Boost choice over .cxx and .hxx. But for directory names instead cxx11 is Boost choice over cpp11? Similarly, shall macros that refer to C++11 be named BOOST_..._CPP11_... or BOOST_..._CXX11_...? In general, shall Boost refer to C++11 as cpp11/CPP11 or cxx11/CXX11? Given that .cpp/.hpp is Boost choice for file names over .cxx/.hxx, I'd think cpp11/CPP11 would be Boost choice over cxx11/CXX11... P.S. I have a similar situation in Boost.Contract where I want to put macros to parse C++11 keywords (override, final, etc) in a separated directory and I want to name that directory cxx11 or cpp11 consistently with other Boost libraries (so users don't have to remember different conventions). Thanks. --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-algorithm-aesthetic-question-about… Sent from the Boost - Dev mailing list archive at Nabble.com.

10 21

[config] local types as template params
by Lorenzo Caminiti 22 Mar '12

22 Mar '12

Hello all, Is it possible to add a macro BOOST_CONFIG_LOCAL_TYPES_AS_TEMPLATE_PARAMS to Boost.Config to indicate if local types can be passed as template parameters? 1) Boost.Closure (formerly, Boost.Local) implements some optimizations when local types can be passed as template parameters. 2) C++11 always allows to pass local types as template parameters. 3) Local types cannot be passed as template parameters on C++03 instead but some C++03 compilers MSVC 8 (and older?) allow it anyway. // If it is possible to pass local types (classes, etc) as template parameters. // This is not possible in pure C++03 but it is possible in some C++03 // extensions (MSVC 8.0) and with C++11 (GCC >= 4.5.x -std=c++0x). #if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 4)) && \ defined(__GXX_EXPERIMENTAL_CXX0X__) // From GCC 4.5.x when -std=c++0x specified. # define BOOST_LOCAL_TYPES_AS_TEMPLATE_PARAMS #elif defined(_MSC_VER) // For (all?) MSVC (tested on MVSC 8.0). # define BOOST_LOCAL_TYPES_AS_TEMPLATE_PARAMS #endif All, can you please try to compile the following example on different compilers/versions and let me know the outcome? If this example compiles successfully then the specific compiler supports local types as template parameters: #include <algorithm> #include <iostream> int main() { struct s { void operator()(int x) { std::cout << x << std::endl; } } l; int nums[] = {1, 2, 3}; std::for_each(nums, nums + 3, l); return 0; } For example, this compiles on GCC >= 4.5.x w/ C++0x extensions enabled and on MSVC 8.0- does it compile on all MSVC versions? Thanks. --Lorenzo

8 12

[config] missing BOOST_HAS_STDINT_H for PGI
by Oliver Kowalke 22 Mar '12

22 Mar '12

ticket: 6724 boost/config/compilers/pgi.h does not define BOOST_HAS_STDINT_H -> boost/cstdint.hpp does not include stdint.h Oliver

2 1

Re: [boost] [git] Mercurial?
by Jason Harris 22 Mar '12

22 Mar '12

> >>>>> Dave Abrahams <dave <at> boostpro.com> writes: > > > More attention from the community, more support, more tools work with it, > > more money behind it, more people will be familiar with it in the long run, > > etc., etc. > > Example: compare the number of commercial tools for working with Git, compared > to those available for working with Mercurial. On OS X along I can use: > SourceTree, Tower, GitHub, GitBox, GitDiary, QuickHub, Octopus, and that's > only the commercial tools! > > By contrast, if I search for "mercurial" in the AppStore, I can only use > SourceTree (which works with both). > Well, I am the author of MacHg a very fully featured multithreaded osx client for mercurial. There was murky and a few other clients around for OSX. But for now the scene seems to have settled into MacHg and SourceTree. I would also point out that I think the kiln team will soon have a nice port of TortiseHg to OSX. A partial listing of general tools is here: http://mercurial.selenic.com/wiki/OtherTools (Note I have not put MacHg on the AppStore since it is a bit of a pain trying to sand box the thing. I think Neil (the author of SourceTree) complained about the fact that he could not include compiled python file etc, in the app store version. Also a good GUI should have some command line drivers. Eg from the command line you should be able to enter "machg somerepo" and have it open in MacHg or something similar. (This has been on my to-do list for quite some time.) And such tools contravene the AppStore guidelines. Eg BBedit had to remove such tools from their application in order to get it onto the AppStore. Eg see http://www.barebones.com/store/macappstore.html and the section about the limitations of the AppStore version.)) I would think most developers would not be strictly limited to the AppStore version and a simple google of "OSX mercurial" will turn up MacHg... As to the whole discussion of Mercurial vs Git. I really have to say that both products are quite similar now in what they can do. However, the learning curve for me for git is just not good. Eg just for some simple comparisons do a: [salt:~] ⌘ hg help pull | wc 40 264 1753 [salt:~] ⌘ git help pull | wc 638 3624 29834 These are basically the same commands. Yet, the size of the help entry for pull for mercurial is 6% of the size of the git help entry. That says a lot about the understandability of one system to the other. (cf the size difference for other commands like pull, log, status, etc.) Git has **soo** many bells and whistles. Every so often as a real DVCS ninja git has something that mercurial doesn't have in my experience. Eg there is a feature in git when you are doing a total conversion of a repository you can run a filter over all of the files as you go. (eg imagine you want to convert all of say windows newlines to unix newlines in every version stored in history, or some other repetitive thing like this.) Up until a little while ago Mercurial didn't have that feature. So on the extreme cases there are definitely bits to git where git has more options. However these extra command switches in git are definitely a very sharp double edged sword in that for the average user the number of git options is just insanely huge. Thus I think the mercurial philosophy of trying to keep things clean, organized, and coherent is much better for at least 90% of users if not more like 98% of users. I am sure that each of you and each of your colleagues are gurus in a number of things, but do you want to require that they are gurus in DVCS systems? Even in Mercurial a lot of the users I encounter are sometimes woefully clued in to what is going on, and Mercurial is more streamlined, and cleanly organized than git (in my humble personal experience.) And it isn't all a bed of roses in Mercurial either. Eg there are things one should really watch out for, for example in using sub-repositories (these parallel sub-modules in git) one should use a thin super-repo layer. We got bitten by this at our work and it has caused problems. See eg http://mercurial.selenic.com/wiki/Subrepository#Recommendations Other points to consider: Those people who think you can't edit history in Mercurial or have many "branches" within a repo, their information is years out of date... I edit history and rebase, etc all of the time. It is part of my standard work flows. The arguments about popularity might have some weight but I think Mercurial and Git are definitely both large enough and will stick around. Besides converting one repo to the other in case one disappears is not that difficult. There are tools which interoperate between both formats (se hg-git.) Also, being a GUI writer I would say the number of differences once you are using a GUI is even smaller in day to day usage once you know what is going on. One, difference is with git you have to be careful to name *everything* or you get "detached heads". In mercurial you don't have to worry about this at all. You can happily update to any revision and start working right there without having to remember to name it / think up a name for it. (However, there are certain advantages to naming everything since then you can track revisions across all sorts of history edits, where-as in Mercurial you have to do some of this tracking manually...) (As a GUI writer I have thought about making the changes to MacHg to be able to release MacGit, but ever time I start playing with git it just... I don't know... I can go into details but the details would likely not be relevant here...) In any case, I use boost in my projects and think it's fantastic! Whether you all end up choosing git or hg a DVCS IMHO is much better than a centralized VCS. (However, I haven't used svn extensively since the company I worked for has skipped directly from cvs to mercurial & git.) Also whether you choose hg or git you might want to have an official mirror in the other system... So users can just use the system they want to. Best of luck, Jason

1 0

[accumulator] Problem with 'droppable_accumulator.hpp' (rev. 77432)
by sguazt 21 Mar '12

21 Mar '12

Hello, I have a problem when compiling with the current trunk version (rev. 77432) of Boost.Accumulator: In file included from projects/boost-trunk/boost/accumulators/framework/accumulator_set.hpp:28:0, from projects/boost-trunk/boost/accumulators/accumulators.hpp:12, ... projects/boost-trunk/boost/accumulators/framework/accumulators/droppable_accumulator.hpp: In copy constructor 'boost::accumulators::droppable_accumulator<Accumulator>::droppable_accumulator(const boost::accumulators::droppable_accumulator<Accumulator>&)': projects/boost-trunk/boost/accumulators/framework/accumulators/droppable_accumulator.hpp:173:54: error: expected type-specifier projects/boost-trunk/boost/accumulators/framework/accumulators/droppable_accumulator.hpp:173:54: error: expected '>' projects/boost-trunk/boost/accumulators/framework/accumulators/droppable_accumulator.hpp:173:54: error: expected '(' projects/boost-trunk/boost/accumulators/framework/accumulators/droppable_accumulator.hpp:173:82: error: expected ')' before 'const' My system is: OS: Fedora 14 x86_64 Compiler: GCC 4.6.1 Compiler's Flags: --ansi -pedantic -Wall -Wextra I think you need to change line 173: : droppable_accumulator::base(*static_cast<droppable_accumulator::base const *>(&that)) with the following (note the addition of "typename") : droppable_accumulator::base(*static_cast<typename droppable_accumulator::base const *>(&that)) After this addition all seems to work. Could you fix it, please? Thank you very much. Best, -- Marco

2 2

Please advise: Boost with LLVM Clang and 0x11 dialect ?
by John M. Dlugosz 21 Mar '12

21 Mar '12

Can someone please advise on how to get Boost headers to work when compiling using Clang (as found on Apple OSX/iOS development) when the 0x11 dialect is enabled? We're stuck at Boost 1.47 because 1.48 doesn't even work with the current settings (C++03 dialect). The Mac developers don't want to fiddle with 1.49 without knowing what the deal is. Is there someone who has used Boost on the Apple with Clang who can relate some tales of how it works and offer suggestions? I've had no luck on the Boost.Users mailing list, or a previous post here on Boost.Devel. Is there anyplace else I might ask? At this point, any scrap of wisdom would be appreciated. —John

2 1

Graph properties and GraphML
by Arthur Castonguay 21 Mar '12

21 Mar '12

I'm using 1.49.0 and am attempting to read a GraphML file that has graph attributes on it (example file below). My test program is below too. I've run into two issues. 1. The GraphML reader didn't quite handle them. There was some facilities put in place but it was never glued together. I added some code (patch below) and now it appears that that will do what I want... I'm getting "property not found" exception now. Great... onto item 2. 2. I cannot seem to wire the graph property into the dynamic properties. I've used the same syntax used for node and edge properties: props.property("gattr", get(&GraphProperty::gattr, g)); I've search examples and cannot find an instance of this to see if graph properties are handled differently. It's possible I've just written bad code for #2. I'm still working through the adjacency_list code to see if I can grok what's going on. Figured maybe someone more familiar with this could find the issue quickly. Once functionaly, I'll report a bug regarding item #1 but I want to ensure the writing of the GraphML works as well before doing that (the code appears to write graph attributes.. can't test yet due to item #2). For those that don't want to bother, this is the compile error I'm getting: boost/graph/adjacency_list.hpp: In function ‘typename boost::property_map<boost::adjacency_list<OutEdgeListS, VertexListS, DirectedS, VertexProperty, EdgeProperty, GraphProperty, EdgeListS>, T Bundle::*>::type boost::get(T Bundle::*, boost::adjacency_list<OutEdgeListS, VertexListS, DirectedS, VertexProperty, EdgeProperty, GraphProperty, EdgeListS>&) [with OutEdgeListS = boost::vecS, VertexListS = boost::vecS, DirectedS = boost::bidirectionalS, VertexProperty = NodeProperty, EdgeProperty = EdgeProperty, GraphProperty = GraphProperty, EdgeListS = boost::listS, T = std::string, Bundle = GraphProperty]’: ex.cpp:37: instantiated from here boost/boost/graph/adjacency_list.hpp:561: error: no matching function for call to ‘boost::bundle_property_map<boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty, boost::listS>, boost::detail::edge_desc_impl<boost::bidirectional_tag, long unsigned int>, EdgeProperty, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::bundle_property_map(boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty, boost::listS>*, std::string GraphProperty::*&)’ boost/boost/graph/properties.hpp:397: note: candidates are: boost::bundle_property_map<Graph, Descriptor, Bundle, T>::bundle_property_map(Graph*, T Bundle::*) [with Graph = boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty, boost::listS>, Descriptor = boost::detail::edge_desc_impl<boost::bidirectional_tag, long unsigned int>, Bundle = EdgeProperty, T = std::basic_string<char, std::char_traits<char>, std::allocator<char> >] boost/boost/graph/properties.hpp:396: note: boost::bundle_property_map<Graph, Descriptor, Bundle, T>::bundle_property_map() [with Graph = boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty, boost::listS>, Descriptor = boost::detail::edge_desc_impl<boost::bidirectional_tag, long unsigned int>, Bundle = EdgeProperty, T = std::basic_string<char, std::char_traits<char>, std::allocator<char> >] boost/boost/graph/properties.hpp:390: note: boost::bundle_property_map<boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty, boost::listS>, boost::detail::edge_desc_impl<boost::bidirectional_tag, long unsigned int>, EdgeProperty, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::bundle_property_map(const boost::bundle_property_map<boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty, boost::listS>, boost::detail::edge_desc_impl<boost::bidirectional_tag, long unsigned int>, EdgeProperty, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >&) Here's my compiler version: $ cc --version i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00) 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. Any ideas? Is item #2 a bug or dumbass programmer (aka me)? Regards, Arthur --- 8< Start ex.graphml 8< --- <?xml version="1.0" encoding="UTF-8"?> <graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd"> <key id="key0" for="graph" attr.name="gattr" attr.type="string"/> <key id="key1" for="node" attr.name="nattr" attr.type="string"/> <key id="key2" for="edge" attr.name="eattr" attr.type="string"/> <graph id="G" edgedefault="directed"> <data key="key0">graphval</data> <node id="n0"> <data key="key1">nodeval0</data> </node> <node id="n1"> <data key="key1">nodeval1</data> </node> <edge source="n0" target="n1"> <data key="key2">edgeval</data> </edge> </graph> </graphml> --- 8< End ex.graphml 8< --- --- 8< Start ex.cpp 8< --- #include <iostream> #include <string> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/graphml.hpp> #include <boost/property_map/dynamic_property_map.hpp> struct GraphProperty { std::string gattr; }; struct NodeProperty { std::string nattr; }; struct EdgeProperty { std::string eattr; }; typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty, EdgeProperty, GraphProperty> Graph; using namespace std; using namespace boost; int main() { Graph g; dynamic_properties props; props.property("nattr", get(&NodeProperty::nattr, g)); props.property("eattr", get(&EdgeProperty::eattr, g)); props.property("gattr", get(&GraphProperty::gattr, g)); // Fails to compile try { read_graphml(cin, g, props); write_graphml(cout, g, props); } catch (parse_error e) { cerr << e.what() << endl; } catch (bad_parallel_edge e) { cerr << e.what() << endl; } catch (directed_graph_error e) { cerr << e.what() << endl; } catch (property_not_found e) { cerr << e.what() << endl; } catch (...) { cerr << "Caught unhandled excption" << endl; } return EXIT_SUCCESS; } --- 8< Start ex.cpp 8< --- Patch to enable graph properties on GraphML files. Using 1.49.0. Index: libs/graph/src/graphml.cpp =================================================================== --- libs/graph/src/graphml.cpp (revision 1) +++ libs/graph/src/graphml.cpp (working copy) @@ -74,6 +74,15 @@ std::vector<const ptree*> graphs; get_graphs(gml, graphs); BOOST_FOREACH(const ptree* gr, graphs) { + // Search for graph attributes + BOOST_FOREACH(const ptree::value_type& attr, *gr) { + if (attr.first != "data") continue; + std::string key = attr.second.get<std::string>(path("<xmlattr>/key")); + std::string value = attr.second.get_value(""); + handle_graph_property(key, value); + } + } + BOOST_FOREACH(const ptree* gr, graphs) { // Search for nodes BOOST_FOREACH(const ptree::value_type& node, *gr) { if (node.first != "node") continue; @@ -183,6 +192,11 @@ } } + void handle_graph_property(const std::string& key_id, const std::string& value) + { + m_g.set_graph_property(m_key_name[key_id], value, m_key_type[key_id]); + } + void handle_node_property(const std::string& key_id, const std::string& descriptor, const std::string& value) { m_g.set_vertex_property(m_key_name[key_id], m_vertex[descriptor], value, m_key_type[key_id]);

1 0

[lambda] Can't get simple lambda working...
by Robert Dailey 21 Mar '12

21 Mar '12

Here is a basic function I have: bool MimeDocument::GetExistingAttachment( std::string const& filename, std::vector<MessageAttachment> const& attachments, MessageAttachment& attachment ) { using namespace boost::lambda; using boost::lambda::_1; std::vector<MessageAttachment>::const_iterator it = std::find_if( attachments.begin(), attachments.end(), bind( &MessageAttachment::name, _1 ) == filename ); if( it != attachments.end() ) { attachment = *it; return true; } return false; } MessageAttachment::name() has 2 overloads, one that takes 1 parameter and the other that takes no parameter. I'm attempting to call the version that accepts no parameters and returns a "char const*". I want to then compare this value to the local variable "filename". This should happen for each object in the vector (_1). I get various types of compiler errors on MSVC9. They all have to do with C2780: 1>c:\code\work\cmake-mds\server\gmmserver\domino\server\interface\dimime.cpp(287) : error C2780: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<10,boost::lambda::function_action<10,T>>,detail::bind_tuple_mapper<const Arg1,const Arg2,const Arg3,const Arg4,const Arg5,const Arg6,const Arg7,const Arg8,const Arg9,const Arg10>::type>> boost::lambda::bind(const Arg1 &,const Arg2 &,const Arg3 &,const Arg4 &,const Arg5 &,const Arg6 &,const Arg7 &,const Arg8 &,const Arg9 &,const Arg10 &)' : expects 10 arguments - 2 provided 1> c:\code\work\cmake-mds\build-vc9\third_party\boost\1.48.0\include\boost\lambda\detail\bind_functions.hpp(1743) : see declaration of 'boost::lambda::bind' Anyone have any idea what I'm doing wrong? --------- Robert Dailey

6 10

Re: [boost] [git] Mercurial?
by Steve Ramsey 21 Mar '12

21 Mar '12

On Mar 20, 2012, at 8:40 PM, Edward Diener <eldiener(a)tropicsoft.com> wrote: > I have never heard a single technical argument, in all the endless > mentions of Git among the people riding that bandwagon, why Git is > better than SVN, or even why any DVCS is better than a centralized SCCS. > I consider this whole move to Git and/or DVCS among "hip" programmers > little more than a move to conform with what others are doing and feel > "cool". > > I am perfectly willing to read well-chosen technical arguments but not > from people already sold on one side or the other. But I really despair > of anyone being able to present such arguments in the atmosphere created > by Git fanatics and DVCS fanatics. The only thing I have gotten from all > this is "I've tried it, I like it, and therefore its superior". > > Feel free, anyone, to point me to a purely technical discussion, > article, whatnot, explaining the practical reasons why using a DVCS, or > Git, is more productive and more pleasurable than using a centralized > SCCS like Subversion. For what it’s worth, here is a series of articles that sold me on DVCS (and Mercurial in particular, though that’s neither here nor there) after spending quite some time wondering whether to bother: <http://hginit.com/> It’s a typically breezy Joel Spolsky piece, but it does cover use cases nicely. Steve

2 1

[CRC][VC++] Can someone debug this?
by Daryle Walker 20 Mar '12

20 Mar '12

Are we still preparing for a release? If not (or afterwards), could someone check why the trunk's version of Boost.CRC, with more Boost.MPL usage, is choking on all versions of Visual C++. Only the latest version gives a specific error; previous versions just dump out. Daryle W.

3 3

BOOST_PP_ITERATE for huge mpl and fusion
by Hite, Christopher 20 Mar '12

20 Mar '12

"Not to 50!!!" - Princess Bride Things like mpl::vector and fusion::map have a configured limit like BOOST_MPL_LIMIT_VECTOR_SIZE. The documentation is dodgy and doesn't mention that while it is configurable you can't really configure it to be more than 50. Many people have stumbled here: http://boost.2283326.n4.nabble.com/msm-Boost-MPL-vector-limit-size-exceeded… http://lists.boost.org/Archives/boost/2004/08/70900.php http://comments.gmane.org/gmane.comp.lib.boost.user/55679 http://lists.boost.org/Archives/boost/2010/09/170443.php Appearantly there are some scripts to generate these headers, but they may not work anymore. I had to rush hack things in my code to make several containers go over 50 in one compilation scope. #define ULTIMATE_N 70 #include <boost/mpl/vector/vector50.hpp> namespace boost { namespace mpl { # define BOOST_PP_ITERATION_PARAMS_1 \ (3,(51, ULTIMATE_N, <boost/mpl/vector/aux_/numbered.hpp>)) # include BOOST_PP_ITERATE() }} I'd really like to fix this in boost. AFAICT all I have to do is find all *50.hpp files and replace the 50 with the appropriate config limit. I count 74 instances of this stuff going on! Mostly it's phoenix, mpl, and fusion. So to wrap it up my questions are: 1) Do the scripts still work? Does anyone use them? Are they regularly tested? 2) Does anyone see a problem with my simple fix? Chris

5 9

Possible bug in libs/context/src/asm/fcontext_ppc64_sysv_elf_gas.S
by Jeremiah Willcock 20 Mar '12

20 Mar '12

This code refers to registers r40 and r41 in several places; I think those should be r30 and r31. There are also many typos in the comments in that source file. -- Jeremiah Willcock

1 0

[mpl] +[fusion] + [phoenix] undocumented hard-coded limit=50
by Hite, Christopher 20 Mar '12

20 Mar '12

This is a re-post of " [boost] BOOST_PP_ITERATE for huge mpl and fusion". I think problem may be that I didn't target a particular library because it happens in three. There is an undocumented hard-coded limit of 50 in MPL, Fusion, and Phoenix. I count two impls 1) has 20 elements all generated boost_1_49_0/boost/mpl/aux_/preprocessed/gcc/vector.hpp 2) stops at 50 boost_1_49_0/boost/mpl/vector/vector50.hpp I don't know if there's a way to generate more. Probably you need python. If that's the case, IMHO this should be documented so users can do it. This doesn't work: #define BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS #define BOOST_MPL_LIMIT_VECTOR_SIZE 60 #include <boost/mpl/vector.hpp> boost_1_49_0/boost/mpl/vector.hpp:36:73: fatal error: boost/mpl/vector/vector60.hpp: No such file or directory Can someone please help. I've upgraded my copy of boost. I've tried figuring out how these headers work. I'm pretty sure I could fix it if I really had to by replacing the 50 in the last file with the *_SIZE. I have this ugly hack in my code to keep things working. Would someone please help?!? Acknowledging the problem would be a start. Chris

4 3

[xpressive] Does '_' match newlines?
by Robert Dailey 19 Mar '12

19 Mar '12

I have the following static regex: sregex filename_re = icase("Content-Disposition:") >> -*_ >> "filename=" >> (s2=-+_) >> ';' ; I want the "*_" part to also match newline characters. I didn't see any flag to turn this on or off. Is this on by default? I see boost::xpressive::regex_constants::syntax_option_type::not_dot_newline, but not sure where you would (or wouldn't) specify this. I only recall the ability to specify flags for a regex when you compile a dynamic regex, not a static one. Help is appreciated! --------- Robert Dailey

2 1

new Overload library version
by Marco Cecchetti 19 Mar '12

19 Mar '12

Hi everyone! I noticed that an overloaded function utility has appeared under boost/functional as a spin-off of Camiti's Boost.Local library. Indeed on 2007 I had begun implementing something similar. All started from a Joel de Guzman's post where he showed a proof of concept of a thin-wrapper of several Boost.Functions. See: http://lists.boost.org/Archives/boost/2007/09/127906.php On that code base, I designed Overload, a small library whose interface matches as much as possible Boost.Function interface. Some documentation was written down thanks to the help and support of Dean M. Berris. Due to lack of time and the small amount of use cases I stopped spending my time on such a project. Anyway lately I have been working on the Overload library again. I have performed a light re-design of the interface, added a few new features and a lot of more testing, finally I've got to improve documentation. I uploaded the new version on the sandbox. In case you are interested these are the links: - library: http://svn.boost.org/svn/boost/sandbox/overload/trunk/ - documentation: http://svn.boost.org/svn/boost/sandbox/overload/trunk/libs/overload/docs/ht… Please don't reply to me about the not so proper library name, I could change it but it is a secondary issue. Regards, -- Marco -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/

1 0

[chrono] [thread] Test names too long
by Steven Watanabe 19 Mar '12

19 Mar '12

AMDG When I try to run the tests for Boost.Thread or Boost.Chrono I get an error like: failed to write output file '..\bin.v2\libs\chrono\test\basic_stopwatch_reporter _laps_accumulator_set_pass_shared.test\msvc-10.0express\debug\asynch-exceptions- on\threading-multi\stopwatch\basic_stopwatch_reporter_laps_accumulator_set_pass. obj.rsp'! Could the names possibly be made shorter? I can get it to build using --hash, but they're still rather long. In Christ, Steven Watanabe

4 5

Re: [boost] size() type
by Olaf van der Spek 18 Mar '12

18 Mar '12

Hi, Any progress on these tickets? Would be nice to have a solution. size() return type should be size_type, not difference_type: https://svn.boost.org/trac/boost/ticket/5971 data() for iterator_range: https://svn.boost.org/trac/boost/ticket/5930 Greetings, -- Olaf

4 15

[git] git-repo?
by Oliver Kowalke 18 Mar '12

18 Mar '12

I'm wondering about Beman Dawes 'Moving Boost to Git' on C++ Now! - has boost an official git-repo? Could I use it instead of svn-trunk? regards, Oliver

2 1

[Range] Path for Bug 5993
by Julien Nitard 18 Mar '12

18 Mar '12

Hi All, Would it be possible to apply the patch I have just submitted to trac on bug 5993 ? It should be pretty harmless. https://svn.boost.org/trac/boost/ticket/5993 Many thanks, Julien

3 3

GSoC Proposal
by Subrata Biswas 18 Mar '12

18 Mar '12

Dear Sir/Madam, I want to design a new IPC for Linux(Which can be extended for windows and mac also) as a project in Google Summer of Code. I have already started it and developed its very basic prototype. I have also written the proposal according to your format. But I could not find the email id where I can send my proposal. I have used your irc but hardly anyone were available there. Can u kindly provide me the links where I can send my project proposal and direcly interact with the mentors. I hope my "Smart IPC" may enrich the smart boost c++ libraries towards smarter c++ libraries. -- Thanking You, Regards Subrata Biswas MTech (pursuing) Computer Science and Engineering Indian Institute of Technology, Roorkee Mob: +91 7417474559

1 0

C++ Now! Conference Program Highlights C++11
by Jon Kalb 17 Mar '12

17 Mar '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

4 5

[format] Mistake in documentation
by Yakov Galka 17 Mar '12

17 Mar '12

The current documentation ( http://www.boost.org/doc/libs/1_49_0/libs/format/doc/format.html) says: "In the Open-group specification, referring to the same argument several times (e.g. *"%1$d %1$d"*) has undefined behaviour." Perhaps it was right some time ago, but it's not longer true. The Open-group specification ( http://pubs.opengroup.org/onlinepubs/009695399/functions/fprintf.html) explicitly allows this: "In format strings containing the "%*n*$" form of conversion specification, numbered arguments in the argument list can be referenced from the format string as many times as required." Thank you, -- Yakov

1 0

Begin Contributing to Boost
by Sathyam Vellal 17 Mar '12

17 Mar '12

Hi. I would like to contribute to the Boost.Graph library. The issues and challenges are presented here < http://www.boost.org/doc/libs/1_49_0/libs/graph/doc/challenge.html> Can somebody please guide me how to begin? I'd really love to be a part of this community! -- Sathyam M Vellal

2 2

has_member_fnc?
by Neal Becker 17 Mar '12

17 Mar '12

It seems c++11 has a new way to spell enable_if, and this can be used to implement has_member_fnc, as in this example: http://pastebin.com/mH2cZ4NP I wonder if has_member_fnc would be a good addition to boost?

6 10

[range] adaptors and member functions pointers
by Yanchenko Maxim 17 Mar '12

17 Mar '12

Hi, While transforming and filtering sequences, it's pretty common to call the elements' member functions, so I think it's worth adding some syntactic sugar for range adaptors in order to achieve cleaner syntax. E.g. if we have a class struct Foo { std::string description() const; }; and we want to get all non-empty descriptions, we could just write this clean code: foo_list | transformed(&Foo::description) | filtered(&std::string::size) To enable this syntax, the attached patch should be applied to boost/range/adaptor/argument_fwd.hpp (diff against 1.47.0). Is there any interest to add this to Boost.Range? Thanks, Maxim

7 9

[thread] Jamfile issue
by Emil Dotchevski 16 Mar '12

16 Mar '12

Hello, In my own Jamfile targets, if I refer to Boost Thread as: alias thread : $(boost)//thread ; I get: error: No best alternative for boost_1_48_0/libs/thread/build/thread_sources next alternative: required properties: <threadapi>win32 <threading>multi not matched next alternative: required properties: <threadapi>pthread <threading>multi not matched I could do this instead: alias thread : $(boost)//thread/<threadapi>win32 ; But that clumsy, I'd be dispatching between POSIX and WIN32 configurations, which ideally should be done internally by Boost Thread's Jamfile. Is there a better way to refer to Boost Thread? Emil Dotchevski Reverge Studios, Inc. http://www.revergestudios.com/reblog/index.php?n=ReCode

3 6

[trunk] what is MSVC 9.0 STL port 5.2?
by lcaminiti 16 Mar '12

16 Mar '12

Hello all, The trunk regressions tests: http://beta.boost.org/development/tests/trunk/developer/summary.html Run on MSVC 9.0 "STL port 5.2" and "WM5 STL port 5.2" on VeecoFTC: msvc- 9.0~stlport5.2 msvc- 9.0~wm5~stlport5.2 What are those? How are they different from the tests that run on MSVC 9.0 "msvc-9.0" on RW_WinXP_VC? Specifically, would you know if the following macro will be #defined to 1 on msvc- 9.0~stlport5.2 and msvc- 9.0~wm5~stlport5.2? // MSVC 7.1=1300, 8.0=1400, 9.0=1500, 10.0=1600 (this workaround was tested at // MSVC 8.0 but it might work also for all MVSC >= 7.1). #if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1400)) && \ !defined(BOOST_TYPEOF_EMULATION) /* doesn't work in typeof-emu mode */ # define BOOST_SCOPE_EXIT_AUX_TYPEOF_THIS_WORKAROUND_01 1 #else # define BOOST_SCOPE_EXIT_AUX_TYPEOF_THIS_WORKAROUND_01 0 #endif Thanks a lot. --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-trunk-what-is-MSVC-9-0-STL-port-5-… Sent from the Boost - Dev mailing list archive at Nabble.com.

1 0

[scope_exit] can MSVC lambdas capture data members?
by lcaminiti 16 Mar '12

16 Mar '12

Hello all, Can anyone try the following code on a MSVC compiler with lambdas (MSVC10?)? #include <vector> struct person {}; struct world { void add_person(person const& a_person) { bool commit = false; persons_.push_back(a_person); auto scope_exit = [&commit, &persons_]() mutable -> void { if(!commit) persons_.pop_back(); }; commit = true; scope_exit(); } private: std::vector<person> persons_; }; int main() { world w; person p; w.add_person(p); return 0; } This code compiles on GCC 4.5.3 with C++0x extensions (including lambdas) but based on some errors I'm seeing in trunk's ScopeExit regressions tests, I'm guessing it will fail using MSVC lambdas with errors similar to the followings: error C3480: 'world::persons_': a lambda capture variable must be from an enclosing function scope warning C4573: the usage of 'world::persons_' requires the compiler to capture 'this' but the current default capture mode does not allow it Unfortunately, I don't have a MSVC compiler with lambdas so thank you very much for trying my code! --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/boost-scope-exit-can-MSVC-lambdas-captur… Sent from the Boost - Dev mailing list archive at Nabble.com.

5 15

[Range] Derived from iterator_range and operator==
by Olaf van der Spek 16 Mar '12

16 Mar '12

Hi, Shouldn't this just work? Comparing two boost::iterator_range<const char*> works fine. #include <boost/range/iterator_range.hpp> class str_ref : public boost::iterator_range<const char*> { }; int main() { boost::iterator_range<const char*> a; a == a; str_ref b; b == b; // 12 } is.cpp: In function ‘int main()’: is.cpp:12:7: error: ambiguous overload for ‘operator==’ in ‘b == b’ is.cpp:12:7: note: candidates are: is.cpp:12:7: note: operator==(boost::iterator_range<const char*>::unspecified_bool_type {aka const char* boost::iterator_range<const char*>::*}, boost::iterator_range<const char*>::unspecified_bool_type {aka const char* boost::iterator_range<const char*>::*}) <built-in> /usr/include/boost/range/iterator_range_core.hpp:438:21: note: bool boost::operator==(const boost::iterator_range<IteratorT>&, const ForwardRange&) [with IteratorT = const char*, ForwardRange = str_ref] /usr/include/boost/range/iterator_range_core.hpp:431:21: note: bool boost::operator==(const boost::iterator_range<IteratorT>&, const boost::iterator_range<Iterator2T>&) [with Iterator1T = const char*, Iterator2T = const char*] /usr/include/boost/range/iterator_range_core.hpp:387:21: note: bool boost::operator==(const ForwardRange&, const boost::iterator_range<IteratorT>&) [with IteratorT = const char*, ForwardRange = str_ref] -- Olaf

1 0

[O/T git and workflows] A couple of questions
by Brian Schrom 16 Mar '12

16 Mar '12

This is slightly off topic, but with recent (and future ;) ) Git discussions, hopefully not too off topic... If Boost were to adopt Git, I believe Gitolite (https://github.com/sitaramc/gitolite, http://sitaramc.github.com/gitolite/ -- docs) or something similar would need to be used which provides some centralization features. Maybe github? Gerrit (http://code.google.com/p/gerrit/) is primarily a code review tool, though provides some centralized support. git flow (https://github.com/nvie/gitflow) has some nice wrappers for branch management. This looks especially appealing for gently introducing people to git. It provides structure and reduces the number of commands. My question is what the workflow, tools, and experience people have with combining all of these tools. I think this community will need something along these lines if it is to transition to Git anyway, so maybe this will get that part of the discussion started. ---- Just to keep the discussion on git going... In my "brain storming" world, there is the central boost repo (which currently exists), I clone it. (When can we start submitting to github? :) ) I use git flow locally for my own branch management. This allows me to work on multiple features independently. When a feature is completed locally, I send the patch (possibly via gerrit ) and that patch sits in the maintainers review queue. If accepted, the patch is applied and merged for the next release. Largely, I believe this is what exists right now. Admittedly, I've only ever submitted one patch to Boost. That was an email directly to the library author. What I want to understand is, if such tools were adopted, would it lower the burden on library maintainers enough to justify the change? Again, my perception of the way things currently are vs could be with git: centralized subversion server. centralized git server (gitolite?) svn checkout trunk git clone developer Use whatever local strategy for development use git flow + whatever local strategy for development create patch and attach to TRAC ticket git push to gerrit server (for instance) poke people on mailing list about patches (poke people on mailing list about pending reviews and such) maintainer applies patch and pushes to server An approved patch gets pushed to centralized server. * Where would build-bot/Jenkins interact in this process? It seems that there are a few places...1) Want to be able to test local branch during development, 2) then test during the patch review and approve process, and 3) finally test on the integrated branch. * Would the "better" localized development tools (git + git flow + more direct patch submission) facilitate more participation in the community over the current method? (my guess is not much, though the people that do contribute might appreciate the improvements. And some would consider them not improvements and stop contributing? * Would the review process save the maintainer's enough time and effort that they're more able to process more patches on a regular basis?

5 6

[random] uniform_01 not usable in backwards compatible mode
by John Maddock 15 Mar '12

15 Mar '12

Apologies for the minor flood of posts.... uniform_01 has a default constructor only (fine for the "new" interface), but for the old interface, the base class has a single arg constructor only and no default constructor. In other words there's no way to construct a uniform_01 in backwards compatibility mode (when the first template arg is a distribution). Also the traits selection class that switches between new and old interfaces should probably be documented (and not in detail{ namespace). Cheers, John.

2 2

[bind] Error C4430 in bind.hpp
by Robert Dailey 15 Mar '12

15 Mar '12

For some reason when I include <boost/bind.hpp> I get the following errors: 1>c:\code\work\cmake-mds\build-vc9\third_party\boost\1.48.0\include\boost\bind\bind.hpp(1200) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>c:\code\work\cmake-mds\build-vc9\third_party\boost\1.48.0\include\boost\bind\bind.hpp(1201) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>c:\code\work\cmake-mds\build-vc9\third_party\boost\1.48.0\include\boost\bind\bind.hpp(1203) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>c:\code\work\cmake-mds\build-vc9\third_party\boost\1.48.0\include\boost\bind\bind.hpp(1204) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>c:\code\work\cmake-mds\build-vc9\third_party\boost\1.48.0\include\boost\bind\bind.hpp(1206) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>c:\code\work\cmake-mds\build-vc9\third_party\boost\1.48.0\include\boost\bind\bind.hpp(1207) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>c:\code\work\cmake-mds\build-vc9\third_party\boost\1.48.0\include\boost\bind\bind.hpp(1209) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>c:\code\work\cmake-mds\build-vc9\third_party\boost\1.48.0\include\boost\bind\bind.hpp(1210) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int They point to this code in bind.hpp: BOOST_BIND_OPERATOR( ==, equal ) BOOST_BIND_OPERATOR( !=, not_equal ) BOOST_BIND_OPERATOR( <, less ) BOOST_BIND_OPERATOR( <=, less_equal ) BOOST_BIND_OPERATOR( >, greater ) BOOST_BIND_OPERATOR( >=, greater_equal ) BOOST_BIND_OPERATOR( &&, logical_and ) BOOST_BIND_OPERATOR( ||, logical_or ) Any idea why this is failing? If more info is needed please let me know. --------- Robert Dailey

4 9

boost.asio lib and CodeLite
by Teemu 15 Mar '12

15 Mar '12

hi group! I´m using CodeLite + MinGW+ Unit Test 1.3 on a Win7 system. Now I want to add the boost.asio library (boost_1_49_0) to CodeLite. I have already linked a few files like: "C:\boost_1_49_0\boost\asio" or "C:\MinGW\include\boost" and so on... But I still get some warnings like: "c:\mingw\bin\../lib/gcc/mingw32/4.4.1/../../../../include/boost/asio/detail/impl/win_object_handle_service.ipp: In member function 'void boost::asio::detail::win_object_handle_service::move_construct(boost::asio::detail::win_object_handle_service::implementation_type&, boost::asio::detail::win_object_handle_service::implementation_type&)': c:\mingw\bin\../lib/gcc/mingw32/4.4.1/../../../../include/boost/asio/detail/impl/win_object_handle_service.ipp:106: error: '::UnregisterWaitEx' has not been declared" I´m not sure, if I have add the boost.asio library correctly and ifI have to link some other libraries from the Windows system? I´ve read somewhere that adding Win-files is necessary to run the boost.asio lib correctly, is that right? and if, which files? I hope someone can help me... best regards Teemu sry for my bad english I´m from germany... -- View this message in context: http://boost.2283326.n4.nabble.com/boost-asio-lib-and-CodeLite-tp4474767p44… Sent from the Boost - Dev mailing list archive at Nabble.com.

1 1

Contributing to Boost Graph Library
by Sathyam Vellal 15 Mar '12

15 Mar '12

Hello. I would like to contribute to Boost Graph Library. I went through the http://www.boost.org/doc/libs/1_49_0/libs/graph/doc/challenge.html which is also included as one of the projects of SoC 2012. How do I begin? Thank you

2 2

[xpressive] Concatenating two regular expressions into one?
by Robert Dailey 15 Mar '12

15 Mar '12

I have the following function: bool MimeDocument::GetMimeHeaderData( PMIMEENTITY entity, MimeHeaderData& header_data ) { bool success = false; std::string headers; GetMimeEntityData( entity, MIME_ENTITY_DATA_HEADERS, headers ); using namespace boost::xpressive; sregex content_disposition_re = icase("Content-Disposition:") >> +_s >> (s1=!as_xpr("inline;")) >> -*_ >> "size=" >> (s2=+_d) >> ';' ; sregex content_id_re = icase("Content-ID:") >> +_s >> '<' >> (s1=+_) >> '>' ; smatch what; if( regex_search( headers, what, content_disposition_re ) ) { header_data.is_inline = what[1] == "inline;"; header_data.size = boost::lexical_cast<unsigned>( what[2] ); success = true; } if( regex_search( headers, what, content_id_re ) ) { header_data.content_id = what[1]; success = true; } return success; } Right now I use 2 sregex objects and search the MIME headers twice to find 2 different lines. Ideally I'd like to just use 1 regex and combine them, but I need to then somehow make it search between all lines, and then the order in which Content-Distribution and Content-ID appear in the headers may vary. Is it best to keep them separated like this, or can I concatenate the regular expressions into 1? --------- Robert Dailey

2 1

[git] neglected aspects
by Steven Samuel Cole 14 Mar '12

14 Mar '12

Hi all, First post here, so please bear with me. A lot has been said in the last year on the subject of a possible migration from svn to git. However, after reading pretty much every message on the issue on this list (sic!), I have the impression that some of the most important aspects did not get the consideration they require. I would therefore like to add my outside perspective. SUMMARY: 1. an svn --> git migration does cause some major, but one-time disruption. However, svn right now causes minor, but continuous disruption on a daily basis - which often goes unnoticed. 2. git's distributed concept is nothing less than one generation ahead of centralized VCSs like svn. The benefits usually do not become apparent until git is actually used in practice. 3. at the moment, boost is significantly missing out on fresh enthusiasm that new contributors could bring into the project; svn and the policies it mandates are partly too blame for that. 4. svn trunk (i.e. boost library) maintainers are too limited by the svn concept in their decision which changes they merge at what point in time and may be pressured into rushing suboptimal decisions; this can make maintenance work painful and frustrating. git greatly alleviates that problem. 5. IMO, it's not 'if', it is 'when'. The longer a migration is delayed, the longer boost development will be slowed down without even noticing. DETAILS: I am aware that some of my points technically are mentioned on the boost git wiki page at https://svn.boost.org/trac/boost/wiki/Git/WhyGit, but they still seem somewhat neglected. This is probably not surprising as many participants in the discussion 1. presumably are established boost contributors and thus share a 'from the inside' view of the subject and 2. are only marginally affected by svn's conceptual problems This is what happened here in the last couple of days: I needed a tool for a job in my current project and I couldn't find one, so I thought about what components I need to build my own. A little web research - Boost.Iostreams looks perfect for the purpose. You have all been through what comes next, be it with boost or with other open source software: Download the latest release, install the libraries, start reading the docs, run some sample code, etc. While reading, I spot a typo in an HTML doc, then another in an include file comment, a third one in another file... the fourth one at the latest makes me think - this is open source, I should sync the latest sources, fix all those typos as I come across them while reading and contribute them back to the project. A quick read on submitting bugs on boost.org, svn co yadi yadi, fix the typos locally. Of course I don't have write privileges to the repo, so the best I can do for now is create a patch and attach that to a bug report. Within minutes, someone takes care of the bug, comments and takes ownership. Excellent! Smithers, money fight! I go back to reading, find more typos. My patch has not been committed to the trunk yet, so my local changes are still sitting there on my local hard drive. If I do another svn diff > file_2.patch, the patch will also contain the changes I have already attached to the bug report. What are my options now ? Revert my changes, base the new ones on the head revision and send another patch ? Create a new patch file and manually remove the diffs of the old changes I already sent ? How will the upstream maintainer know which changes are based on what version ? Also, I notice a few other things that in my opinion could be done better to facilitate adoption of the iostreams library. I would be willing to do the work and I would in the perfect position as I am walking in the shoes of an adopter right now - but these are separate from the typo fixes and they are larger issues; considering I can't check my changes in, would I really want to have them sit on my local harddrive, waiting possibly for months for someone upstream to review and hopefully merge them ? A couple of hours later: I get an email from boost bugs/svn; the upstream maintainer has committed my changes. However, I actually receive not one, but two emails, because the upstream guy chose to split my patch into changes on documentation and changes on source code (which presumably required extra work on his part). I do an svn up and now have to deal with conflicts between my local changes and the new commits: I make a note of my second set of changes and overwrite my local files with the new repo versions, then bring the second set back in. Uff! That's a lot of work just to fix some typos! And these are just cosmetic issues in discrete chunks that do not require any testing; contributing changes to source code would take even more effort and more caution - build and test on several platforms, peer review, etc. Also, the upstream maintainer jumped on the bug report right away and integrated my changes within hours. This is the ideal situation (thanks again Daniel, great job! :-) - usually, things don't happen so quickly - especially around major release time. HOW THIS IS DONE IN GIT: 1. google 'github iostreams' --> click first search result: https://github.com/boost-lib/iostreams (this can be even reduced to 'gh: iostreams' by integrating github into chrome search engines, but that's another story...) 2. on githup website, click 'fork', wait a few seconds --> this auto-creates my personal online github iostreams repo 3. on my local machine, open a shell, enter 'git clone ', copy & paste the repo .git url shown on the website in there and run e.g. 'git clone git(a)github.com:<username>/iostreams.git' --> this creates a local fork of my personal online iostreams repo + the mailing list probably changes the line above to 'hidden' + there is github/desktop integration and a plethora of gui clients 4. i change local files and commit to the local repo. once a set of changes is complete, i push them online into my personal online repo; once my work has reached some maturity, I send a pull request to the upstream maintainer of the official iostreams repo, aka the keeper of the trunk. disclaimer: I have omitted one-time steps to set up local git, github.com account, ssh keys, lastpass integration, yadi yadi. these steps are abundantly documented online, done in minutes and required only once. THE GIT ADVANTAGE: I don't have to wait for the first set of changes to be merged into the trunk before I resync, resolve conflicts and base the second set on the new head revision; I simply create a new branch for a new change set and send a new pull request once my work is complete. The upstream maintainer has no peer pressure to merge any changes in: He/she is sitting on the head revision and is looking at a number of pull requests for change sets in various personal forks like mine; these are more like 'change offers' the maintainer is free to merge in if he/she so chooses (cherry-picking) - or postpone if this is not the time because for example a major release is due and they seem too risky. I as a contributor do not really care so much: Of course I am stoked if my work actually makes it into the project eventually, but the point in time when this happens technically does not matter to me - pending changes will not get in my way if the merge takes a little longer. This is the major difference between svn and git - and I can not stress this advantage enough: I am decoupled from, but still connected to the official trunk. I can make arbitrary changes and group them in any way I see fit. I offer them to upstream and move on to new development. As a side effect, this also provides an overview impression of quality and continuity of the work of a potential new contributor. Of course it is technically correct that svn also supports the concepts of forks and branches, but in terms of tooling and mentality, they are considered much more heavy-weight than in git and might get created a couple of times a year - while in git, they might come and go a couple of times a day. Finally, the 'series of tubes' metaphor IMO does not really hit it. Subversion to me seems more like a freight train where the waggons move at different speeds, so they constantly bump into the car behind and in front of them; movement of the entire train is jerky. Git on the other hand is a bunch of space ships linked by hyperelastic tractor beams: Even if one travels out as far as the delta quadrant, the upstream connection will always make sure the collective does benefit from any new development it brings back from there. [snipped several paragraphs about cultural and other aspects; maybe some other time.] # ssc

24 81

[random] Use of make_unsigned/make_signed
by John Maddock 14 Mar '12

14 Mar '12

Several of the random number distributions use make_[un]signed internally. However, this trait is not intended as a customization point for UDT's - it's only supposed to be instantiated for integer or enum types - and yes that's a deliberate decision that's now enshrined in the standard ;-) Unfortunately this means that these distributions can't be instantiated on UDT's - big number types for example. Since it seems that these traits are only used to obtain a type that is large enough to store a difference between the endpoints of a range, would it be possible for these to change to use something like: namespace boost{ namespace random{ template <class T> struct range_type : public make_signed<T> { }; }} Then range_type could be [partially-] specialized for UDT's. Note that for some types, there might simply not be a corresponding unsigned type at all, but I'm assuming that doesn't foul up the logic, as long as the type is wide enough? Comments? Thanks, John.

2 1

[random] independent_bits_engine
by John Maddock 14 Mar '12

14 Mar '12

Am I correct in thinking that the independent_bits_engine produces a uniform distribution? I'm interested in using it with arbitrary precision integers to produce B-bit random numbers for the record, Thanks, John.

2 1

Is there interest in static code analysis?
by Antony Polukhin 14 Mar '12

14 Mar '12

Because of some interest on this topic, I would like to clarify some things: Of course you can have some trial version and use it by yourself, BUT more mature solution would be to find a "boost's liason contact". This contact will interact with the company, provide access to reports for developers. In that case all developers can get access to reports without downloading/installing the trial version and use static analysis tool for a longer time. That case will also require from a "boost's liason contact" to look carefully through the license for that tool and agree to it as a maintainer of a whole boost project (I am not permitted to take such solutions). Best regards, Antony Polukhin

3 6

As of 1.49, I am completely unable to build boost with PDB files using VS2010
by Michael Goldshteyn 14 Mar '12

14 Mar '12

Whatever changes were made in 1.49 made it impossible for me to build a debug version of the boost libraries with PDB files. I am using the following command line: ----- bootstrap b2 --without-mpi --without-python --build-dir=vc100-bld-64-bit --build-type=complete --toolset=msvc-10.0 --stagedir=64-bit-vc100 debug-symbols=on debug-store=database ----- I am getting errors like: libs\math\build\..\src\tr1\assoc_laguerre.cpp(6) : error C2858: command-line option 'program database name (/Fde:\dev\devel\libs\boost\boost_1_49_0\vc100-bld-64-bit\boost\bin.v2\libs\math\build\msvc-10.0\debug\debug-store-database\link-static\runtime-link -static\libboost_math_tr1-vc100-sgd-1_49.pdb)' inconsistent with precompiled header, which used '/Fde:\dev\devel\libs\boost\boost_1_49_0\vc100.pdb' libs\math\build\..\src\tr1\assoc_laguerre.cpp(6) : error C2859: e:\dev\devel\libs\boost\boost_1_49_0\vc100-bld-64-bit\boost\bin.v2\libs\math\build\msvc-10.0\debug\debug-store-database\link-static\runtime-link-static\libboost_math_tr1-vc100-sgd-1_49.pdb is not the pdb file that was used when this precompiled header was created, recreate the precompiled header. I've tried turning off precompiled headers using pch=off, but still get errors preventing me from building. I have to completely remove the debug-store=database build option to get a build, but then I have no PDB files at all for the boost libraries. Thanks for any help, Michael Goldshteyn

2 1

GSoC 2012
by Devashish Tyagi 14 Mar '12

14 Mar '12

Hello, I am Devashish Tyagi, an Undergraduate Student of Computer Science and Engineering at Indian Institute of Technology, Delhi. I am currently in my Third Year. I have a considerable experience of coding in C++ and strong background in the field of Algorithms. I would like to be part of Boost C++ Library for GSoC 2012. I went through the Ideas page here<https://svn.boost.org/trac/boost/wiki/SoC2012>. I would like to extend Boost.Graph by implementing the requests mentioned on this page<http://www.boost.org/doc/libs/1_49_0/libs/graph/doc/challenge.html>. Among the Challenges mentioned, I am particularly interested in implementing Dynamic Graph Algorithms and a minimum cost maximum flow Algorithm. Could someone guide me as to from where should I begin my research and Is there a priority order among the requests/challanges mentioned on this page<http://www.boost.org/doc/libs/1_49_0/libs/graph/doc/challenge.html>. Regards -- Devashish Tyagi 2nd Year Undergraduate Computer Science and Engineering Dept.

1 0

Boost.Build maintenance
by Bruno Santos 14 Mar '12

14 Mar '12

Hi, I been submitting some patches in trac, but I noticed there's no activity there for boost.build. Since I use boost.build extensively and I would like to volunteer as maintainer for it. Regards, Bruno

3 2

[xpressive] Compiler error; seems like normal usage?
by Robert Dailey 13 Mar '12

13 Mar '12

My regex is as follows: sregex re = "Content-Disposition:" >> +_s >> (s1=!"inline;") >> -*_ >> "size=" >> (s2=+_d) >> ';' ; This seems to be the part causing the compiler errors: (s1=!"inline;") When I change it to this: !(s1="inline;") It compiles just fine. I'm on VS2008 SP1. Anyone know why the former usage does not work? I still want the group to capture an empty string if the string "inline;" does not match, which is why I put the ! inside the capture group. Does this matter? --------- Robert Dailey

3 3

Boost 1.49 BOOST_PP_ITERATION_FLAGS(): causes build failures; would like a boost maintainer comment
by Steve M. Robbins 13 Mar '12

13 Mar '12

Would really appreciate if ticket 6631 is a Boost bug that I can patch for Debian, or whether it is just API breakage that boost-using packages (like luabind) must adapt to. Thanks, -Steve #6631: BOOST_PP_ITERATION_FLAGS(): error: missing binary operator before token "(" --------------------------------+------------------------------------------- Reporter: peter@??? | Owner: no-maintainer Type: Bugs | Status: new Milestone: To Be Determined | Component: preprocessor Version: Boost 1.49.0 | Severity: Regression Resolution: | Keywords: BOOST_PP_ITERATION_FLAGS --------------------------------+------------------------------------------- Changes (by Steve Robbins <smr@???>): * cc: smr@??? (added) Comment: I am currently investigating building all Debian packages with Boost 1.49 and "luabind" fails to build with very similar symptoms. Can the boost maintainer comment whether this is a bug in boost or a simple API break. Thanks, -Steve

2 4

Hi-Introduction
by Rhythm Gupta 13 Mar '12

13 Mar '12

Hi, I'm Rhythm Gupta. I am a first year student of Computer Science in IIT Delhi, India. I love coding and i have strong background in Maths and Science. Hence, BoostC++ looks like the perfect organisation for me. :-) Would like to apply for BoostC++ in GSoC. Could you help me get started with BoostC++?

2 1

Boost B-Tree Library Status
by Joel 12 Mar '12

12 Mar '12

Beman et al, Is the Boost B-tree Library still on track to be proposed? The reception at BoostCON 2011 was quite warm, IIRC. http://github.com/boostcon/2011_presentations/raw/master/tue/proposed_b_tre… Activity on github seems to be dried up. https://github.com/Beman/Boost-Btree Also, how well do you think it would work with large keys and small payloads (512 byte keys, a few integers for payload). Thanks! Joel

3 3

[GIL] gil/metafunctions.hpp broken in 1.49?
by Andrew Hundt 12 Mar '12

12 Mar '12

I may be mistaken, but it looks like boost::mpl::vector_c may have been moved from <boost/mpl/vector.hpp> to <boost/mpl/vector_c.hpp> and it appears <boost/gil/metafunctions.hpp> has not been updated to reflect this change. Cheers! Andrew Hundt

2 1

[fusion] Fusion using varidiac templates
by paul Fultz 12 Mar '12

12 Mar '12

hi, I remember seeing that there was an initial port of fusion to use variadiac templates a while back. Is that code available somewhere? If so, where could a find that? Thanks, Paul

3 3

Using an element of a class A in a constructor of a class B (reflection with boost::python)
by christophe jean-joseph 12 Mar '12

12 Mar '12

Hello The situation is as follow. I have a C++ code that I haven't written and that I barely can modified. I am supposed to reflect this code in Python with boost. In the code, I have something looking like this: Class A_Base { A_Base(){}; ~A_Base(){}; Whatever virtual and pure virtual functions; } Class A_Derived{ A_Derived(Type1 arg1,...){whatever instructions;} ~A_Derived(){}; Whatever functions; } Class B { B(A_Base& aBase, double& x){}; ~B(){}; Whatever functions; } In the C++ main, at some point aDerived A_Derived is set, and then B(aDerived, x). I need to reflect that under python. Until now, I have been able, with a simple example, to reflect a function f, which is not a ctor, from a class B using A_Base& as argument type, but I can't figure out how to deal with it for a constructor. Based on: http://wiki.python.org/moin/boost.python/ExportingClasses I am declaring f under both its class B and A_Base as follow: .def("f", &B::f) But when I try this for a constructor as f, it refuse to compile. Anyone got a clue? Thank you very much in advance for any further help.

3 5

Keynotes for C++ Now!
by Jon Kalb 12 Mar '12

12 Mar '12

C++ Now! (formerly BoostCon) is pleased to announce its lineup of keynote speakers for the 2012 conference: Howard Hinnant, Sean Parent, and Daveed Vandevoorde. Howard Hinnant is the principal author of libc++, the standard C++ library implementation used by the Clang compiler. During the development of C++11, Howard served as chairman of the C++ Standards Committee¹s Library Working Group, and is largely responsible for the design of what Scott Meyers has called the language¹s ³flagship new feature:² rvalue references. His keynote will demonstrate how rvalue references are used in move semantics and perfect forwarding. Sean Parent is a principal scientist and software architect for Adobe¹s mobile digital imaging group and formerly managed Adobe¹s Software Technology Lab. He was also the keynote speaker for the very first BoostCon, where he gave one of the most inspiring and memorable talks we¹ve ever had. We¹re very pleased to welcome him back for an encore. He will be speaking on what¹s next for C++ programmers: how do we write beautiful code that truly exploits today¹s hardware and infrastructure? Daveed Vandevoorde is a compiler developer with Edison Design Group, the author (with Nicolai Josuttis) of ³C++ Templates: The Complete Guide,² a co-founder of comp.lang.c++.moderated, and one of the few C++ Committee Members who is equally comfortable working on library design, language evolution, or the arcana of core language issues. Daveed is currently a leader in the effort to add true modules to the C++ language. He¹ll be talking about the design of the C++ modules feature and what it would mean for the future of the language. ³We are thrilled to have such a powerhouse lineup in the first year of the new language standard,² said Dave Abrahams the conference founder and co-chair. ³C++Now! 2012 is truly shaping up to be a feast for the C++ enthusiast.² C++ Now! 2012 will be held May 13-18 in Aspen Colorado. Registration is now open at http://cppnow.org/registration/. Keynote details at http://cppnow.org/overview/. Jon

1 0

boost::algorithm::trim_copy() behaves like "strdup" in normal C, does it allocate a new string ?
by g.fanini＠gmail.com 11 Mar '12

11 Mar '12

Could I ask for a clarification whether boost::algorithm::trim_copy() behaves like "strdup" in normal C, i.e. does it allocate a new string ? or does it modify the passed string without allocating a new string ? It is not entirely clear from the documentation : http://www.boost.org/doc/libs/1_34_0/doc/html/boost/algorithm/trim_copy.html Because the argument passed has the modifier "const" I am led to believe it would leave the passed string unchanged, and return a newly allocated string. Possibly would you consider kindly updating the documentation reflecting the returned string is newly allocated.I am asking this becauseI am trying to work with preexisting boost code which uses boost::algorithm::trim_copy() profusely and I have severe leakage problems.Thank you for any information.

7 9

[bgl] Update on maximum adjacency search
by Fernando Vilas 11 Mar '12

11 Mar '12

Hi, Since the last round of feedback, I think the implementation is at least closer to being releasable. This is not quite a re-send because I attached the wrong patch last time, but I also forgot the subject tags to get the attention of the BGL folks. Changes: - All parameters other than the graph itself are available as named parameters - Visitor is not pass-by-value like other search algorithms - Documentation created Still potential todo: - Update documentation with graphical walkthrough on a small graph - Find a way to make the priority queue work without unwrap_ref() - Do not depend on one_bit_color_map internals in min_cut_mas_visitor - Other suggestions from Boost community -- Thanks, Fernando Vilas fvilas(a)iname.com

1 0

Re: [boost] Boost.ntree_container (bi_tree, quad_tree, oct_tree, etc ptr containers) Is there any interest in this?
by Dan Walters 11 Mar '12

11 Mar '12

Hi all, This is my current implementation of an oct tree that I am using on a project I am working on. It is a templated oct tree which serves as a pointer container. There is usage shown in the main() function at the bottom of the sample. http://codepad.org/yIAblSDN Please bear in mind it is not fully optimized or std compliant, just put together for a project but shows the intended basic functionality and method. Compatibility with boost geometry is a great suggestion. Again, I am mindful of defining the boundaries of this library, but if it makes sense then template specialization or utility code could be provided to use the libraries together easily and elegantly. k-d trees are very interesting, and if discussion found these potentially useful enough, they would certainly belong in the same library. I think, in any context, this should be thought of as a container library above all else and would be potentially useful not just in game or geometry programming, but open to use where ever useful, including as a memory efficient pointer container for sparsely populated multidimensional arrays. Best wishes, Dan On 10 March 2012 20:04, Daniel F. Savarese <dfs(a)savarese.org> wrote: > > In message <848178090.20120310163009(a)gmail.com>, pavel writes: > >by the way i have a ready implementation of kd trees (if anyone is > >interested): > > > > > http://programmizm.sourceforge.net/blog/2011/a-practical-implementation-of-… > >trees > > That's not exactly a generic implementation, nor one that is STL-friendly > (e.g., no iterators). For a more generic implementation that aims for STL > interoperability where possible, see the header-only libssrckdtree library: > http://www.savarese.com/software/libssrckdtree/ > > But this is off-topic for the thread, which--as I understand it--is > concerned > with fixed-size multidimensional spatial pointer containers oriented toward > 3D applications, not variable-sized multidimensional spatial value > containers > applicable to arbitrary domains. > > daniel > > > _______________________________________________ > Unsubscribe & other changes: > http://lists.boost.org/mailman/listinfo.cgi/boost >

2 1

Re: [boost] Boost.ntree_container (bi_tree, quad_tree, oct_tree, etc ptr containers) Is there any interest in this?
by pavel 11 Mar '12

11 Mar '12

Daniel wrote on Sunday, March 11, 2012 at 0:04:28: > That's not exactly a generic implementation, nor one that is STL-friendly > (e.g., no iterators). you are perfectly right but i believe that this implementation can be almost trivially integrated with a generic (read: template) interface besides, i hardly see a kd tree or an octree as a (associative) container -- Pavel P.S. if you notice a grammar mistake or weird phrasing in my message please point it out

1 0

[filesystem.v3] v1.49 Path constructor issue in VS Debug configuration
by Fraser Hutchison 11 Mar '12

11 Mar '12

Hello, The changes made to filesystem/v3/src/path.cpp between v1.48 and v1.49 seem to be causing a crash if I initialise a path as e.g. a global variable or as a static class member, but only for a Debug build. (I'm using VS10 on 64-bit Win 7). The following program exhibits this behaviour: |#include "boost/filesystem/v3/path.hpp" boost::filesystem::path p("p"); int main() { return 0; } | In Debug, I can see that the third path constructor calls |codecvt()|, which calls |wchar_t_codecvt_facet()|, which returns |codecvt_facet|. However, |codecvt_facet| hasn't been initialised at this point. This appears to only be the case for Debug builds though. I'm unclear as to whether this is an MSVC bug though. I thought that the Standard required |codecvt_facet| to have been initialised before |wchar_t_codecvt_facet()| since it comes earlier in the same translation unit. Could someone please clarify whether I should file a bug report with boost please? Thanks, Fraser.

2 2

[range] MFC/ATL select_first / select_second specializations for map_keys and map_values adaptors
by Adam Walling 11 Mar '12

11 Mar '12

I enjoy using the range library, and also foreach. When dealing with legacy code, the MFC / ATL range adaptors are wonderful. Unfortunately, the CMap and CMapStringToString iterators return CPair objects rather than std::pair, hence causing the select_first / select_second_mutable / select_second_const metafunctions to fail. I added these specializations to allow them to work with the map_keys and map_values adaptors. Hopefully they will be of use to someone in the future or adapted to be included with the other MFC / ATL code. Would it be worthwhile to format this as a patch to the library? namespace boost { namespace range_detail { // CMap and CMapStringToString range iterators return CPair, // which has a key and value member. Other MFC range iterators // already return adapted std::pair objects. This allows usage // of the map_keys and map_values range adaptors with CMap // and CMapStringToString // specialization for CMap template<class KEY, class ARG_KEY, class VALUE, class ARG_VALUE> struct select_first<CMap<KEY, ARG_KEY, VALUE, ARG_VALUE>> { typedef BOOST_DEDUCED_TYPENAME CMap<KEY, ARG_KEY, VALUE, ARG_VALUE> map_type; typedef BOOST_DEDUCED_TYPENAME range_reference<const map_type>::type argument_type; typedef BOOST_DEDUCED_TYPENAME const KEY& result_type; result_type operator()( argument_type r ) const { return r.key; } }; template<class KEY, class ARG_KEY, class VALUE, class ARG_VALUE> struct select_second_mutable<CMap<KEY, ARG_KEY, VALUE, ARG_VALUE>> { typedef BOOST_DEDUCED_TYPENAME CMap<KEY, ARG_KEY, VALUE, ARG_VALUE> map_type; typedef BOOST_DEDUCED_TYPENAME range_reference<map_type>::type argument_type; typedef BOOST_DEDUCED_TYPENAME VALUE& result_type; result_type operator()( argument_type r ) const { return r.value; } }; template<class KEY, class ARG_KEY, class VALUE, class ARG_VALUE> struct select_second_const<CMap<KEY, ARG_KEY, VALUE, ARG_VALUE>> { typedef BOOST_DEDUCED_TYPENAME CMap<KEY, ARG_KEY, VALUE, ARG_VALUE> map_type; typedef BOOST_DEDUCED_TYPENAME range_reference<const map_type>::type argument_type; typedef BOOST_DEDUCED_TYPENAME const VALUE& result_type; result_type operator()( argument_type r ) const { return r.value; } }; // specialization for CMapStringToString template<> struct select_first<CMapStringToString> { typedef range_reference<const CMapStringToString>::type argument_type; typedef const CString& result_type; result_type operator()( argument_type r ) const { return r.key; } }; template<> struct select_second_mutable<CMapStringToString> { typedef range_reference<CMapStringToString>::type argument_type; typedef CString& result_type; result_type operator()( argument_type r ) const { return r.value; } }; template<> struct select_second_const<CMapStringToString> { typedef range_reference<const CMapStringToString>::type argument_type; typedef const CString& result_type; result_type operator()( argument_type r ) const { return r.value; } }; } } -- - Adam D. Walling

1 0

[Config] Meaning of BOOST_NO_CXX11_HDR_INITIALIZER_LIST
by Michel Morin 10 Mar '12

10 Mar '12

I noticed that BOOST_NO_INITIALIZER_LISTS was replaced by BOOST_NO_CXX11_HDR_INITIALIZER_LIST recently. I have a question related to this change: Does BOOST_NO_CXX11_HDR_INITIALIZER_LIST imply that initializer lists are supported by the compiler? (I guess that the compiler support is checked in a compiler config and the existence of <initializer_list> is checked in a std lib config.) If so, shouldn't the documentation be updated? Regards, Michel

4 17

Boost trunk on Solaris 10 sparc
by Maciej (Matchek) Bliziński 09 Mar '12

09 Mar '12

Hello, I've made an attempt to build Boost from subversion trunk on Solaris 10 on sparc, with gcc-4.6.2. The build didn't succeed, and I'll be looking into ways to make it pass. I've recorded the build in log file which includes all the setup: http://buildfarm.opencsw.org/~maciej/boost-2012-02-29-09-51.log Some highlights: error: No best alternative for libs/context/build/asm_context_sources var/tmp//ccU7e2QF.s: Assembler messages: /var/tmp//ccU7e2QF.s:401: Error: Architecture mismatch on "cas". /var/tmp//ccU7e2QF.s:401: (Requires v9|v9a|v9b; requested architecture is v8.) /opt/csw/lib/gcc/sparc-sun-solaris2.10/4.6.2/include-fixed/sys/feature_tests.h:341:2: error: #error "Compiler or options invalid for pre-UNIX 03 X/Open applications and pre-2001 POSIX applications" In file included from /opt/csw/lib/gcc/sparc-sun-solaris2.10/4.6.2/../../../../include/c++/4.6.2/bits/postypes.h:42:0, from /opt/csw/lib/gcc/sparc-sun-solaris2.10/4.6.2/../../../../include/c++/4.6.2/iosfwd:42, from /opt/csw/lib/gcc/sparc-sun-solaris2.10/4.6.2/../../../../include/c++/4.6.2/ios:39, from /opt/csw/lib/gcc/sparc-sun-solaris2.10/4.6.2/../../../../include/c++/4.6.2/ostream:40, from /opt/csw/lib/gcc/sparc-sun-solaris2.10/4.6.2/../../../../include/c++/4.6.2/iterator:64, from ./boost/next_prior.hpp:15, from ./boost/utility.hpp:17, from ./boost/python/instance_holder.hpp:10, from ./boost/python/object/pointer_holder.hpp:14, from ./boost/python/to_python_indirect.hpp:10, from ./boost/python/converter/arg_to_python.hpp:10, from ./boost/python/call.hpp:15, from ./boost/python/object_core.hpp:14, from ./boost/python/object/enum_base.hpp:8, from libs/python/src/object/enum.cpp:6: There were a couple of other errors, they are in the log file. What the current status of Solaris builds? Is there anyone else building Boost on Solaris 10? Are any of the problems that are in the log file know and possible to work around? Maciej

5 10

Re: [boost] Is there interest in a reusable stream-based console?
by Michael Hava 09 Mar '12

09 Mar '12

> I am interested in your library and seeing it become a part of Boost, > however I agree that history, search, auto-complete, etc being integrated > into the library would be key to making it a more useful addition. I'll look into that… > I can understand the header-only motivation, but have you considered > using SWIG (http://www.swig.org/) to wrap you C++ in your favorite > scripting language and then simply re-using the interactive shell > provided by that language? Honestly not, as providing a way to interop with a scripting language was not part of the original idea… (I'm not even that much a fan of scripting languages…) > (example: http://www.youtube.com/watch?v=VHFu6q1twtE ) Looks nice, but it seems you focused far more on the "programming language aspect" than my original design was. You see I developed my first design based on experience in a product I'm working on in my job, where we offer a console in addition to the GUI for faster input. That console is deeply integrated into the program and was never really designed from the ground up to be reusable… > About the interface, I'm not sure if a command should be defined only by a > simple std::function. I've tried it before but I > wasn't able to make it work as more information were required. Maybe I should have explained that a bit more: the command-class uses a std::function internally to store the callback that's to be executed, it's not a std::function.

2 1

Re: [boost] Is there interest in a reusable stream-based console?
by Michael Hava 09 Mar '12

09 Mar '12

@Julien: I haven't looked into boost::program_options yet, though I don't see a problem in integrating the current design in anything as it's merely a class that reads from a std::basic_istream and writes to a std::basic_ostream whilst calling registered callbacks based on the input… The parameters are currently instances of std::basic_string which are passed to the callback which can than operate on these parameters. On the list of commands thing: I thought about that for a while now and would say that something like Lua would be a perfect solution to be combined with the current design to allow that flexible scripting… @Artyom: I've never before heard about GNU Readline; does that mean that consoles like bash don't offer such a functionality to programs automatically (something that even cmd.exe does)? "Help" is meant to be a short help text on the command, similar to a man-page…

5 5

Is there interest in a reusable stream-based console?
by Michael Hava 09 Mar '12

09 Mar '12

I’ve recently started to design a header-only reusable console-class that’s based on std::iostream. It can be customized by adding a variable amount of “commands”. The implementation is currently based on std::stream and may support any compatible stream as input and output. A typical example of usage would be (excluding namespaces): console c(console::case_sensitive);//create case-sensitive console, that reads commands from std::cin and outputs to std::cout and std::cerr c += command(“Name of command”, “Description of command”, “Extended information on parameters of command”, function);//add command to console, whereas function is a std::function c();//execute console; console is executed until function to stop is called Is there any interest in adding such a library to boost? greetz Michael

4 3

[Config] Patch: clang implemented N3276 decltype
by Michel Morin 08 Mar '12

08 Mar '12

Clang implemented N3276 decltype (which does not require type-completeness of a function call expression) Attached a patch for boost/config/compiler/clang.hpp. BTW, BOOST_NO_DECLTYPE_N3276 needs to be a more descriptive name? Regards, Michel

5 13

workarounf for missing uintptr_t on PGI?
by Oliver Kowalke 08 Mar '12

08 Mar '12

Hi, the PGI compiler (pgi- 11.9) seams not to support intptr_t and uninptr_t. Does boost provide a workaround I'm not aware of? Is the PGI compiler relevant (== does it matter if unit-test fails for PGI but pass GCC, MSVC, INTEL)? Oliver -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de

2 4

Using an element of a class A in a constructor of a class B (reflection with boost::python)
by christophe jean-joseph 07 Mar '12

07 Mar '12

Hello everyone, The situation is as follow. I have a C++ code that I haven't written and that I barely can modified. I am supposed to reflect this code in Python with boost. In the code, I have something looking like this: Class A_Base { A_Base(){}; ~A_Base(){}; Whatever virtual and pure virtual functions; } Class A_Derived{ A_Derived(Type1 arg1,...){whatever instructions;} ~A_Derived(){}; Whatever functions; } Class B { B(A_Base& aBase, double& x){}; ~B(){}; Whatever functions; } In the C++ main, at some point aDerived A_Derived is set, and then B(aDerived, x). I need to reflect that under python. Until now, I have been able, with a simple example, to reflect a function f, which is not a ctor, from a class B using A_Base& as argument type, but I can't figure out how to deal with it for a constructor. Based on: http://wiki.python.org/moin/boost.python/ExportingClasses I am declaring f under both its class B and A_Base as follow: .def("f", &B::f) But when I try this for a constructor as f, it refuse to compile. Anyone got a clue? Thank you very much in advance for any further help.

1 0

[move] [container] [unordered] version 1.49.0 and gcc 3.4.3
by Burt, David 07 Mar '12

07 Mar '12

Dear all I am trying to use boost on the LynxOS-SE 5.0.0 operating system. This has gcc 3.4.3 as the tool chain. To validate the library I am running the regression tests. Previously we have used boost 1.39.0 with some minor patches, 1.49.0 has required fewer patches. However I am stuck with the following problem, if someone could suggest a workaround or identify a patch to the toolchain that I can request to be included by LynuxWorks it would be very much appreciated. The technique used by the move, container & unordered libraries to generate specific implementations of methods based on type characteristics does not work on this compiler. I have included the compiler output from one of the tests. Both of the methods defined in move_helpers are generated for the push_back method even though they should be mutually exclusive and one of them should not be generated based on the SFINAE principal. Thanks David. move - move_algorithm - gcc-lynx Compiler output: ../boost/container/vector.hpp: In instantiation of `boost::container::vector<movable, std::allocator<movable> >': ../libs/move/test/move_algorithm.cpp:19: instantiated from here ../boost/container/vector.hpp:996: error: `template<class BOOST_MOVE_TEMPL_PARAM> typename boost::enable_if_c<(((! boost::is_class<BOOST_MOVE_TEMPL_PARAM>::value) || (! boost::move_detail::is_rv<BOOST_MOVE_TEMPL_PARAM>::value)) && (! boost::is_same<T,BOOST_MOVE_TEMPL_PARAM>::value)), void>::type boost::container::vector::push_back(const BOOST_MOVE_TEMPL_PARAM&) [with BOOST_MOVE_TEMPL_PARAM = BOOST_MOVE_TEMPL_PARAM, T = movable, A = std::allocator<movable>]' and `template<class BOOST_MOVE_TEMPL_PARAM> typename boost::enable_if_c<(( boost::is_class<T>::value && boost::is_same<T,BOOST_MOVE_TEMPL_PARAM>::value) && (! boost::has_move_emulation_enabled<BOOST_MOVE_TEMPL_PARAM>::value)), void>::type boost::container::vector::push_back(const BOOST_MOVE_TEMPL_PARAM&) [with BOOST_MOVE_TEMPL_PARAM = BOOST_MOVE_TEMPL_PARAM, T = movable, A = std::allocator<movable>]' cannot be overloaded ../boost/container/vector.hpp:1117: error: `template<class BOOST_MOVE_TEMPL_PARAM> typename boost::enable_if_c<(((! boost::is_class<BOOST_MOVE_TEMPL_PARAM>::value) || (! boost::move_detail::is_rv<BOOST_MOVE_TEMPL_PARAM>::value)) && (! boost::is_same<T,BOOST_MOVE_TEMPL_PARAM>::value)), boost::container::container_detail::vector_iterator<typename boost::container::allocator_traits<A>::pointer> >::type boost::container::vector::insert(boost::container::container_detail::vector_const_iterator<typename boost::container::allocator_traits<A>::pointer>, const BOOST_MOVE_TEMPL_PARAM&) [with BOOST_MOVE_TEMPL_PARAM = BOOST_MOVE_TEMPL_PARAM, T = movable, A = std::allocator<movable>]' and `template<class BOOST_MOVE_TEMPL_PARAM> typename boost::enable_if_c<(( boost::is_class<T>::value && boost::is_same<T,BOOST_MOVE_TEMPL_PARAM>::value) && (! boost::has_move_emulation_enabled<BOOST_MOVE_TEMPL_PARAM>::value)), boost::container::container_detail::vector_iterator<typename boost::container::allocator_traits<A>::pointer> >::type boost::container::vector::insert(boost::container::container_detail::vector_const_iterator<typename boost::container::allocator_traits<A>::pointer>, const BOOST_MOVE_TEMPL_PARAM&) [with BOOST_MOVE_TEMPL_PARAM = BOOST_MOVE_TEMPL_PARAM, T = movable, A = std::allocator<movable>]' cannot be overloaded ________________________________ Please consider the environment before printing this e-mail. The contents of this e-mail message (including any attachments) are confidential to and are intended to be conveyed for the use of the recipient to whom it is addressed only. If you receive this transmission in error, please notify the sender of this immediately and delete the message from your system. Any distribution, reproduction or use of this message by someone other than recipient is not authorized and may be unlawful.

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Shit. Looks like I broke something
by Marshall Clow 07 Mar '12

07 Mar '12

When I run the status tests; I get the following error [ Revision 77175; gcc 4.2.1; Mac OS X 10.7.3; toolset darwin ] > cd $BOOST/trunk/status > ../b2 > MPI auto-detection failed: unknown wrapper compiler mpic++ > Please report this error to the Boost mailing list: http://www.boost.org > You will need to manually configure MPI support. > Performing configuration checks > > - has_icu builds : no > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:604: in object(main-target)(a)26280.add-alternative from module object(main-target)@26280 > error: default build must be identical in all alternatives > error: main target is ../libs/context/build/asm_context_sources > error: with > error: differing from previous default build <toolset>darwin > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:482: in build-main-targets from module object(project-target)@192 > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:332: in main-target from module object(project-target)@192 > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:397: in find-really from module object(project-target)@192 > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:435: in object(project-target)(a)192.find from module object(project-target)@192 > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:373: in find-really from module object(project-target)@2522 > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:435: in object(project-target)(a)2522.find from module object(project-target)@2522 > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:816: in resolve-reference from module targets > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:833: in targets.generate-from-reference from module targets > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:1217: in generate-dependencies from module object(alias-target-class)@2529 > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:1266: in object(alias-target-class)(a)2529.generate from module object(alias-target-class)@2529 > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:732: in generate-really from module object(main-target)@26276 > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:704: in object(main-target)(a)26276.generate from module object(main-target)@26276 > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:258: in object(project-target)(a)2522.generate from module object(project-target)@2522 > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build/targets.jam:258: in object(project-target)(a)827.generate from module object(project-target)@827 > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/build-system.jam:736: in load from module build-system > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/kernel/modules.jam:283: in import from module modules > /Volumes/EyeFive/Marshall/Sources/boost/trunk/tools/build/v2/kernel/bootstrap.jam:142: in boost-build from module > /Volumes/EyeFive/Marshall/Sources/boost/trunk/boost-build.jam:17: in module scope from module I was building fine; I checked in r77115, which was a bunch of changes in libs/config/test; ran the tests there, all was well. Then I tried a full regression test, and got this. Maybe it was the other changes that were made to build (77190/91/92/93), but they look benign to me. Suggestions on the best way to debug this? -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

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Re: [boost] [Boost-commit] svn:boost r77194 - in trunk: boost/config boost/config/compiler boost/config/stdlib libs/config/doc/html/boost_config libs/config/test libs/config/test/all
by Michel Morin 07 Mar '12

07 Mar '12

Hi Marshall, > Author: marshall > Date: 2012-03-03 22:00:49 EST (Sat, 03 Mar 2012) > New Revision: 77194 > […] > --- /trunk/libs/config/test/boost_no_0x_hdr_array.ipp (original) > +++ trunk/libs/config/test/boost_no_cxx11_hdr_array.ipp 2012-03-03 22:00:49 EST (Sat, 03 Mar 2012) > […] > -namespace boost_no_0x_hdr_array { > +namespace boost_no_0cxx11_hdr_array { `boost_no_0cxx11_hdr_array` should be `boost_no_cxx11_hdr_array` ;) Regards, Michel

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[numeric] Applying trivial bugfix
by Antony Polukhin 06 Mar '12

06 Mar '12

Hi, There are a lot of feature requests to support compilation with disabled exceptions #5731, #5076, #5393, #5800. Fix is trivial and well known: replace throw x; with BOOST_THROW_EXCEPTION(x); in a converter_policies.hpp file. But the library maintainer does not like BOOST_THROW_EXCEPTION because of code bloat. Can I apply another trivial fix: struct def_overflow_handler { void operator() ( range_check_result r ) // throw(negative_overflow,positive_overflow) { #ifndef BOOST_NO_EXCEPTIONS if ( r == cNegOverflow ) throw negative_overflow() ; else if ( r == cPosOverflow ) throw positive_overflow() ; #else if ( r == cNegOverflow ) ::boost::throw_exception(negative_overflow()) ; else if ( r == cPosOverflow ) ::boost::throw_exception(positive_overflow()) ; #endif } } ; Adding this will fix all the tickets and allow some of the dependent libraries to build with disabled exceptions. Boost.Lexical_cast tests will cover Boost.Numeric usage cases with disabled exceptions. Best regards, Antony Polukhin

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[msm]omitting region id at the entry pseudo state
by Takatoshi Kondo 05 Mar '12

05 Mar '12

Hello, Now, I'm using Boost.Msm (Version1.49.0). I have a question about a transition behavior when I omit a region id at the entry pseudo state. The document said that when we use the explicit entry, if the state machine satisfied the conditions below, we can omit the region id. http://www.boost.org/doc/libs/1_49_0/libs/msm/doc/HTML/ch03s02.html#d0e852 " Thanks to the mpl_graph library you can also omit to provide the region index and let MSM find out for you. The are however two points to note: - MSM can only find out the region index if the explicit entry state is somehow connected to an initial state through a transition, no matter the direction. - There is a compile-time cost for this feature. " Because of the discussion below, I believe that this rule can also be applied to entry pseudo states. http://boost.2283326.n4.nabble.com/msm-how-to-distinguish-region-ids-tt3612… However, when I omitted the region id, the state machine transitioned to the SubState1. struct Entry1:msmf::entry_pseudo_state<> {}; If I provided the region id, the state machine transitioned to the SubState2. struct Entry1:msmf::entry_pseudo_state<0> {}; See entry_pt_omit_rid.cpp (Attached file) As far as I can understand, Entry1 and SubState1, initial_state, are connected. (See fig.png) Is there any reason that I can't omit the region id in this case? Thanks, Takatoshi

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[Thread] Dll Plugin depending from boost thread
by Keraval Yannick 05 Mar '12

05 Mar '12

Hi guys, An application developed in my company uses the concept of "plugin" which relies on the use of DLL (windows 7 box, Visual Studio 2005). We are using Boost v 1.43 and when loading a plugin with a call to LoadLibrary, application asserts with the following message Debug Assertion Failed! Program: C:\Windows\system32\regsvr32.exe File: f:\dd\vctools\vc7libs\ship\atlmfc\src\mfc\dllinit.cpp Line: 587 --> ASSERT(AfxGetModuleState() != AfxGetAppModuleState()); We could point out that this is due to the use of the boost thread library. A quick google search pointed us to an issue in the Boost.Thread library (e.g. http://stackoverflow.com/questions/5355931/adding-include-boost-thread-mutex -hpp-breaks-my-activex-control). One proposed solution is to build a DLL instead of a static lib but this is impossible in our company (only plugin can be compiled as dll). We also try to update boost to V1.49 but the debug assertion is still raised. Is there another way to fix this ? We could not find any ticket related to this problem (neither in the opened tickets nor in the closed tickets), is this behavior considered as normal ? Thanks -- View this message in context: http://boost.2283326.n4.nabble.com/Thread-Dll-Plugin-depending-from-boost-t… Sent from the Boost - Dev mailing list archive at Nabble.com.

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Parts of linkflags are disappearing: $ISALIST gone
by Maciej (Matchek) Bliziński 05 Mar '12

05 Mar '12

My linkflags setting involves a dollar sign: linkflags='-R/opt/csw/lib/$ISALIST' The $ISALIST dynamic token tells the linker to iterate through supported instruction sets and pick the best one[1]. When the Boost binaries are built, the RPATH in the binaries is missing the dollar sign and everything after it: $ /usr/ccs/bin/dump -Lv work/solaris10-sparc/pkgroot/opt/csw/gxx/lib/sparcv9/libboost_iostreams.so.1.49.0 | grep RPATH [13] RPATH /opt/csw/lib/64:/opt/csw/gxx/lib/:/opt/csw/gxx/lib/64:/opt/csw/lib/ Do you see the /opt/csw/lib/ bit with the slash at the end? It could be explained by the contents of linkflags being interpolated by a shell. In my build, it's important to pass the dollar sign unchanged. Here's an example of correctly set RPATH: /usr/ccs/bin/dump -Lv /opt/csw/lib/libz.so.1 | grep RPATH [6] RPATH /opt/csw/lib/$ISALIST:/opt/csw/lib I need to pass the same flag to Boost libraries. Has anyone else seen this problem? Maciej [1] http://docs.oracle.com/cd/E19082-01/819-0690/appendixc-3/index.html

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[context] Providing template class enumerate in context.hpp
by Julien Nitard 04 Mar '12

04 Mar '12

Hi all, I am trying to use the newly accepted boost.context and I am wondering why something as useful as the template enumerate is not diretly given when including "context.hpp" and not even in a separate header. Since it's in the doc it would be a good addition IMHO. Thanks, Julien PS: the link to boost.context doc is broken and the git repos seems to have moved.

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bug in gcc.jam
by Oliver Kowalke 04 Mar '12

04 Mar '12

Hello, gcc.jam:451 applies always -m32 for 32bit systems. In the case of ARM architecture this is false because gcc on arm does not recognize -m32. In order to correct this issue I need to know how to test for ARM architecture at this code line (sorry I'm not that boost.build expert). Oliver

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boost::adaptors::keys for mutable ranges of pairs
by Valentin Ziegler 04 Mar '12

04 Mar '12

Hello, map.hpp defines two overloads for adaptors::values, one for StdPairRange& and another for const StdPairRange const& rng. On the other hand, there is just a single adaptors::keys which takes StdPairRange const&. In particular, the code below will not compile: boost::find_if( boost::adaptors::keys(rng), SomePredicate() ).base()->second=NewValue(); Therefore, I would propose an adaptors::keys(StdPairRange& rng) overload similar to adaptors::values(StdPairRange&). Iterators of the returned range shall have a mutable base iterator. Further, iterators of the returned range should have a reference type of range_value<StdPairRange>::type::first_type& , so the elements in keys are mutable where StdPairRange admits this. Regards, Valentin -- Valentin Ziegler | vziegler(a)think-cell.com Software Engineer think-cell Software GmbH | Chausseestr. 8/E | 10115 Berlin | Germany http://www.think-cell.com | phone +49 30 666473-10 | US phone +1 800 891 8091 Amtsgericht Berlin-Charlottenburg, HRB 85229 | European Union VAT Id DE813474306 Directors: Dr. Markus Hannebauer, Dr. Arno Schoedl

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[config] std::unique_ptr, std::ref detection?
by Peter Dimov 04 Mar '12

04 Mar '12

Suppose I want to implement a shared_ptr constructor taking std::unique_ptr. To avoid breaking pre-C++11 compilers, I need to, at least, know whether <memory> contains std::unique_ptr. (I'd also like to know if there's std::ref in <functional> because the specification of the constructor uses it.) But the config library doesn't seem to provide a way. There's no macro for std::unique_ptr, and there's no macro for "generic C++11 compiler and library".

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Possible Bug in Boost Geometry's Huiller Algorithm
by Brian Ahr 03 Mar '12

03 Mar '12

Hi Folks. I was looking at the implementation of the huiller algorithm in boost, and it seems to be partially incorrect. See boost/geometry/strategies/spherical/area_huiller.hpp In the apply() function, we have if(lon2 < lon1){ E =-E;} which I believe should instead be calculation_type lon;if( lon2 < lon1 ) lon = lon1 - lon2;else lon = lon1 - lon2 + two_pi;if(2* half_pi < lon ) E =-E; according to Graphics Gems 5, pg 45 - 46. The comments at the top of the C++ file state that the code was derived from code in Graphics Gems 4, though the code was later corrected in Graphics Gems 5. I noticed this when trying to calculate areas of polygons on a sphere, where one of the points was (0, 0). In that case, it would always return a negative area, even though the polygon was defined counter-clockwise. Using a point other than (0,0) seemed to alleviate the problem, which got me wondering what was going on. Can anybody else confirm that this is an issue? Any suggestions for cleanly overriding boost's implementation until this is fixed? Thanks! - Brian

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[predef] Thanks for all the comments..
by Rene Rivera 01 Mar '12

01 Mar '12

I would like to than everyone who reviewed and/or commented on my library. Instead of trying to respond individually to each point raised I will do a single post about all the points I've gathered, and will gather when I reread all the posts. Hopefully I can write that up by Monday. Needless to say there are a few changes I need to do, regardless of acceptance results :-) Again, thanks to all. And thanks to Joel for managing the review. Rene. -- -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com -- 102708583/icq - grafikrobot/aim - grafikrobot/yahoo

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Adapting Polygon to work with point attributes
by Paul Miller 01 Mar '12

01 Mar '12

Boost::Polygon looks like exactly what I need to do some boolean operations on polygons but my polygons have additional attributes per point that I want to carry through the operation. But I can't figure out how to get polygon to create sensible values for the attributes other than X,Y, and I can't find an example that covers this scenario. It seems from the documentation that this is possible however. Can someone point me to an example, to say, adapt a polygon with this Point type? struct Point { int x, y; float r, g, b, a; }; Ideally it would average new r, g, b, a values together to make new points and polygon join points, but it could just copy one of the existing Points' attributes instead. I'm not picky. Cheers!

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[TypeTraits] Patch: improving detectability of clang's intrinsics
by Michel Morin 01 Mar '12

01 Mar '12

Attached a patch to improve detectability of `__is_pod` and `__is_empty` intrinsics in clang. This is done by newly introduced `__has_feature(__is_pod__)` and `__has_feature(__is_empty__)` macros. (Clang trunk now accepts feature names with preceding and following double underscores.) Regards, Michel

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Re: [boost] [git] neglected aspects
by Brian Wood 01 Mar '12

01 Mar '12

Dave Abrahams: > I don't see any advantage at all in having a "Boost supertree." If I > need a cluster of five libraries to get a job done, I don't see a reason > to mess around with anything more than those five. And with the > dependencies properly encoded, I won't even have to ask for all of those > explicitly. +1 for keeping things simple. This effort has been discussed for years. Is it close to being ready? Regards, Brian Wood Ebenezer Enterprises http://webEbenezer.net

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