July 2013 - Boost - lists.preview.boost.org

Boost.Operators and make_shared
by Pieter 13 Jul '13

13 Jul '13

LS, I have noticed that using Boost.Operators has a side-effect which I can't explain. I am using std::make_shared as a default, however, some of the boost libraries I use pull in boost::make_shared as well. When using some class T2 derived from one of the boost.operators classes, this causes MSVC2010 to not compile when invoking make_shared<T2> as the compiler can no longer resolve between the two overloaded versions of make_shared for some reason. I am hoping that someone out can explain what is happening here. A minimal example is included here: #include <memory> #include <boost\operators.hpp> #include <boost\make_shared.hpp> struct T1 {}; struct T2 : boost::equality_comparable<T2> {}; int main( int argc, const char* argv[] ) { T1 Object1; T2 Object2; using std::make_shared; std::shared_ptr<T1> Ptr1 = make_shared<T1>(Object1); // OK std::shared_ptr<T2> Ptr2 = make_shared<T2>(Object2); // error C2668: 'boost::make_shared' : ambiguous call to overloaded function return 1; } Thanks in advance! Pieter

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[regression] patch for running tests in parallel and out-of-sync files
by Robert Kawulak 13 Jul '13

13 Jul '13

When I was running tests in parallel (using b2 -j option) I was getting random warnings in the results table because "msvc.manifest" lines were interleaved with compile/link actions. I've fixed this with the attached patch - is it OK to apply it to trunk/release? BTW, I've noticed that the following files in tools/regression/src haven't been updated in release branch even though they've been changed in trunk a long time ago: compiler_status.cpp (trunk date 2012-01-21, release date 2011-10-06) library_status.cpp (trunk date 2013-03-25, release date 2013-03-09) Is it OK to update these in release branch? Best regards, Robert

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[log] Set default log source name
by Renato Forti 12 Jul '13

12 Jul '13

Hi All, Have any way to define a custon log source name on simple_event_log_backend! I foud a method to get (get_default_source_name), but where is "set" method! HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EventLog\Application\do kagent simple event source I want set/change default name (in my case) : "dokagent simple event source" Thanks

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[config] Feature request: BOOST_OVERRIDE
by Borislav Stanimirov 12 Jul '13

12 Jul '13

Hi, I think it will be a nice feature to add BOOST_OVERRIDE to Boost.Config in a manner similar to BOOST_CONSTEXPR. It's a nice keyword and it would be nice if people could make use of it when it's available. -- Borislav

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multi_index broken on gcc4.7
by Hartmut Kaiser 12 Jul '13

12 Jul '13

In code which compiled just fine until yesterday I'm now seeing: /opt/boost/trunk-release/boost/multi_index/detail/index_base.hpp: In member function 'std::pair<typename boost::multi_index::detail::multi_index_node_type<Value, IndexSpecifierList, Allocator>::type*, bool> boost::multi_index::detail::index_base<Value, IndexSpecifierList, Allocator>::final_emplace_(Args&& ...)': /opt/boost/trunk-release/boost/multi_index/detail/index_base.hpp:214:29: error: expected primary-expression before ')' token /opt/boost/trunk-release/boost/multi_index/detail/index_base.hpp: In member function 'std::pair<typename boost::multi_index::detail::multi_index_node_type<Value, IndexSpecifierList, Allocator>::type*, bool> boost::multi_index::detail::index_base<Value, IndexSpecifierList, Allocator>::final_emplace_hint_(boost::multi_index::detail::index_base<Value , IndexSpecifierList, Allocator>::final_node_type*, Args&& ...)': /opt/boost/trunk-release/boost/multi_index/detail/index_base.hpp:233:16: error: expected primary-expression before ')' token OS: Debian Unstable Kernel: Linux 3.2 GCC: 4.7 (C++11, x86-64) Boost: SVN Trunk Build Type: Release Regards Hartmut --------------- http://boost-spirit.com http://stellar.cct.lsu.edu

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[variant] Applying a portion of fixes
by Antony Polukhin 12 Jul '13

12 Jul '13

Hi, I'd like to fix this issue: https://svn.boost.org/trac/boost/ticket/8772 Apply patch for this issue: https://svn.boost.org/trac/boost/ticket/7911 And take care of this: https://svn.boost.org/trac/boost/ticket/8717 Patches and ideas for fixes are described in tickets. If there'll be no objections till next weekend I'll commit the fixes. -- Best regards, Antony Polukhin

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Boost 1.54.0 released!
by Marshall Clow 11 Jul '13

11 Jul '13

Release 1.54.0 of the Boost C++ Libraries is now available. These open-source libraries work well with the C++ Standard Library, and are usable across a broad spectrum of applications. The Boost license encourages both commercial and non-commercial use. This release contains five new libraries and numerous enhancements and bug fixes for existing libraries. New Libraries: Log: Logging library, from Andrey Semashev. TTI: Type Traits Introspection library, from Edward Diener. Type Erasure: Runtime polymorphism based on concepts. For details, including download links, see http://www.boost.org/users/news/version_1.54.0 You can also download directly from SourceForge: http://sourceforge.net/projects/boost/files/boost/1.54.0/ To install this release on your system, see http://www.boost.org/doc/libs/release/more/getting_started/index.html Thanks, --The Boost release team Beman Dawes Daniel James Eric Niebler Marshall Clow Rene Rivera Vladimir Prus

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Regression tests report page stuck
by Joaquin M Lopez Munoz 11 Jul '13

11 Jul '13

Hi, the trunk testing bot http://www.boost.org/development/tests/trunk/developer/summary.html seems to be stuck since ~1.5 days ago. Thank you, Joaquín M López Muñoz Telefónica Digital

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[gil] Portability of new code issue.
by Harg Tholan 11 Jul '13

11 Jul '13

Hi all, Christian has been working on some new features for GIL, such code works fine in Windows 7 with VS11, but it will fail to compile with GCC in Debian Wheezy. I've been trying to figure out why is this failing and possible workarounds with no success. For those with time wanting to help: 1. You will need boost-trunk. 2. I have attached the "bleeding edge" code (a pair of .hpp) as well as a test case. 3. Compile: g++ subsampled_test.cpp -o ss -lboost_unittesting_framework My Compiler Version: g++ (Debian 4.7.2-5) 4.7.2 Errors: yuv_image.hpp:234:38: error: expected primary-expression before ‘,’ token subsampled_test.cpp:28:41: required from here ../yuv_image.hpp:234:5: error: ISO C++ forbids comparison between pointer and integer Note: I have attached the code here because I had to fix some template code, adding/removing 'tyepename', as well as prevention of template parameter shadowing. As you already know, Microsoft's compiler is very 'flexible', allowing non-standard code to compile. Regards, Juan.

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[filesystem] Please take care of #8706
by Antony Polukhin 10 Jul '13

10 Jul '13

Hi, There is a ticket https://svn.boost.org/trac/boost/ticket/8706 and patch in it that fixes compilation of Boost.Filesystem under Android NDK. Tested patch under latest NDK and it works well. Fix is required to start regression tests for droid platform. -- Best regards, Antony Polukhin

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[function] Bind to std::function if supported?
by Andrew Ho 09 Jul '13

09 Jul '13

The boost::move library binds to std::move/T&&/etc. when the compiler supports such features, and only uses work-around mechanisms when the compiler lacks such support. Should we add similar support for boost::function? something like: #ifdef BOOST_FUNCTION_USE_STANDARD_LIBRARY_FUNCTION // alternative: #ifndef BOOST_NO_CXX11_HDR_FUNCTIONAL #include <functional> namespace boost { using ::std::function; } #else // whatever boost::function currently does #endif // ... something similar for boost::bind and std::bind I haven't looked at boost::atomic yet, but we could also consider similar bindings to std::atomic if the library doesn't already do so.

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[shared_array] Why not in C++11 ?
by Sid Sacek 09 Jul '13

09 Jul '13

Does anyone know why 'boost::shared_array<>' was not made part of C++11, since pretty much all the other smart pointers were? -Sid

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[context] SSE/AVX registers preservation
by Andrey Semashev 09 Jul '13

09 Jul '13

Hi, I've been looking at Boost.Context and wondering whether it preserves SSE/AVX state on context switches. From the code it doesn't look like the case - only jump_x86_64_ms_pe_masm.asm contains the code that saves some (not all) xmm registers and ymm registers are never saved. Is this intentional or the library simply doesn't support SSE/AVX? And why not use xsave/xrstor to consistently support all future extensions?

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Re: [boost] Interest in a 'Boost.property' library?
by Joe Mucchiello 08 Jul '13

08 Jul '13

Personally, I always consider properties with getters/setters an anti-pattern for OOP languages like C++. Class interfaces should include only those methods that describe logically valid actions one might take on instances of the class. The idea of properties might sometimes be appropriate. But often times, programs will see a hammer and treat everything they see after it as nails. It becomes easy to add a few more getters and setters for "the rest" of the implementation details and you lose proper encapsulation. Usually when I find a class with lots of get/set methods I find a class with very little thought used when that class was designed.

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[log] Setup Windows event log backends
by Renato Forti 08 Jul '13

08 Jul '13

Work well, on win 7/vc 11! Win 8/vc 11, don't work! mc is not detected! On Thu, Jul 4, 2013 at 11:38 PM, Renato Forti <re.tf(a)acm.org> wrote: > Hi, > I did, but don't work! I have mc, and I remove bin.v2. But boost build > don't find my mc :( > > - message-compiler : no > - compiler-supports-ssse3 : yes > - compiler-supports-avx2 : yes > - gcc visibility : no > - long double support : yes > > C:\boost_1_54_0>mc > Microsoft (R) Message Compiler Version 1.12.9200 Copyright (c) > Microsoft Corporation. All rights reserved. > > No cached! I am on Windows 8, and vc11! Thanks again! Hm, that's strange. Perhaps, a Win 8 thing? What does bin.v2/config.log say? _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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[unordered] a strange limitation for move emulation in Boost.Unordered
by Joaquin M Lopez Munoz 08 Jul '13

08 Jul '13

Here: http://www.boost.org/doc/html/unordered/compliance.html#unordered.complianc… it reads: "Non-copyable objects can be stored in the containers, but without support for rvalue references the container will not be movable." Why not? Container movement does not ever touch its elements, so I don't see the connection. Joaquín M López Muñoz Telefónica Digital

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boost-1.54 needs a bugfix!
by Oliver Kowalke 08 Jul '13

08 Jul '13

unfortunately boost-1.54 needs a bugfix - because my request to merge boost.coroutine into release a required bugfix was not applied :( I'm wondering because the regression-tests are passed?! what to do? should I modify the fix in boost-release and archives of boost-1.54 are rebuild?

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[fusion] Adapter for std::array
by Mateusz Loskot 07 Jul '13

07 Jul '13

Hi, I have prototyped Fusion adapter for std::array, as an attempt to clear the related feature request: https://svn.boost.org/trac/boost/ticket/8241 Here is the functional and testable code of the adaptor : https://github.com/mloskot/boost_fusion_std_array I will appreciate any critique and comments. Unfortunately, I have hit the apparently well-known problem. It is the Fusion begin/end ADL issues with C++0x range-based for and such, as discussed and reported here: http://lists.boost.org/Archives/boost/2010/12/174199.php https://svn.boost.org/trac/boost/ticket/4028 There has been no feedback to the ticket #8241, so I'm not sure what is the Fusion authors' view on std::array adoption. So, a couple of questions: Do the Fusion authors consider any cure for the ADL issues? If not, despite the inconvenience of use of qualified names, would it be still possible to accept std::array into Fusion? Best regards, -- Mateusz Loskot, http://mateusz.loskot.net

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Interest in a 'Boost.property' library?
by Metodi Todorov 07 Jul '13

07 Jul '13

Is there any interest of "C# property" like library? struct vec2 { float get_x() const{...} float set_x() const{...} ... property_rw<float, vec2, &vec2::get_x, &vec2::set_x> x; vec2() : y(this) {} }; vec2 v; v.x = 15.0f; cout << v.x << endl; Example: http://sourceforge.net/projects/cproperty/?source=dlp Regards, Metodi Todorov

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Benchmarking for performance?
by Arpan Sen 07 Jul '13

07 Jul '13

Hi Boost Dev, What sort of benchmarking does the community do for performance when moving from one revision to another? Kind of regression numbers for benchmark tests I would say for memory and time required. Does not have to be at an application level - even at a data structure level is a good start. Thanks a lot. Arpan

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Historic of regression tests?
by Joaquin M Lopez Munoz 07 Jul '13

07 Jul '13

The regression tests at http://www.boost.org/development/tests/release/developer/summary.html are constantly updated (of course), but I seem to remember that the version manager used to backup a snapshot of this at each release. Am I right (I found nothing searching through boost.org)? Is there some sort of historic info on regression tests? Thank you, Joaquín M López Muñoz Telefónica Digital

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[log] Setup Windows event log backends
by Renato Forti 06 Jul '13

06 Jul '13

Hi, I am trying setup a basic: <http://www.boost.org/doc/libs/1_54_0/libs/log/doc/html/log/detailed/sink_ba ckends.html#log.detailed.sink_backends.event_log> Windows event log, and I copy and past code from log documentation. My app link with: 1> main.cpp 1> Linking to lib file: boost_filesystem-vc110-mt-gd-1_54.lib 1> Linking to lib file: boost_system-vc110-mt-gd-1_54.lib 1> Linking to lib file: boost_log-vc110-mt-gd-1_54.lib 1> Linking to lib file: boost_thread-vc110-mt-gd-1_54.lib 1> Linking to lib file: boost_log_setup-vc110-mt-gd-1_54.lib 1> Linking to lib file: boost_date_time-vc110-mt-gd-1_54.lib 1> Linking to lib file: boost_chrono-vc110-mt-gd-1_54.lib But I have some link problems: 1>qt.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall boost::log::v2_mt_nt5::sinks::basic_simple_event_log_backend<char>::basic_si mple_event_log_backend<char>(void)" (__imp_??0?$basic_simple_event_log_backend@D@sinks@v2_mt_nt5@log@boost@@QAE@ XZ) referenced in function "class boost::shared_ptr<class boost::log::v2_mt_nt5::sinks::basic_simple_event_log_backend<char> > __cdecl boost::make_shared<class boost::log::v2_mt_nt5::sinks::basic_simple_event_log_backend<char> >(void)" (??$make_shared@V?$basic_simple_event_log_backend@D@sinks@v2_mt_nt5@log@boos t@@@boost@@YA?AV?$shared_ptr@V?$basic_simple_event_log_backend@D@sinks@v2_mt _nt5@log@boost@@@0@XZ) 1>qt.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall boost::log::v2_mt_nt5::sinks::basic_simple_event_log_backend<char>::~basic_s imple_event_log_backend<char>(void)" (__imp_??1?$basic_simple_event_log_backend@D@sinks@v2_mt_nt5@log@boost@@QAE@ XZ) referenced in function "public: void * __thiscall boost::log::v2_mt_nt5::sinks::basic_simple_event_log_backend<char>::`scalar deleting destructor'(unsigned int)" (??_G?$basic_simple_event_log_backend@D@sinks@v2_mt_nt5@log@boost@@QAEPAXI@Z ) 1>qt.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall boost::log::v2_mt_nt5::sinks::basic_simple_event_log_backend<char>::set_even t_type_mapper(class boost::log::v2_mt_nt5::aux::light_function<enum boost::log::v2_mt_nt5::sinks::event_log::event_type __cdecl(class boost::log::v2_mt_nt5::record_view const &)> const &)" (__imp_?set_event_type_mapper@?$basic_simple_event_log_backend@D@sinks@v2_mt _nt5@log@boost@@QAEXABV?$light_function@$$A6A?AW4event_type@event_log@sinks@ v2_mt_nt5@log@boost@@ABVrecord_view@456@@Z@aux@345@@Z) referenced in function "void __cdecl init_logging(void)" (?init_logging@@YAXXZ) 1>qt.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall boost::log::v2_mt_nt5::sinks::basic_simple_event_log_backend<char>::consume( class boost::log::v2_mt_nt5::record_view const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (__imp_?consume@?$basic_simple_event_log_backend@D@sinks@v2_mt_nt5@log@boost @@QAEXABVrecord_view@345@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocat or@D@2@@std@@@Z) referenced in function "protected: void __thiscall boost::log::v2_mt_nt5::sinks::basic_formatting_sink_frontend<char>::feed_rec ord<class boost::log::v2_mt_nt5::aux::fake_mutex,class boost::log::v2_mt_nt5::sinks::basic_simple_event_log_backend<char> >(class boost::log::v2_mt_nt5::record_view const &,class boost::log::v2_mt_nt5::aux::fake_mutex &,class boost::log::v2_mt_nt5::sinks::basic_simple_event_log_backend<char> &)" (??$feed_record@Vfake_mutex@aux@v2_mt_nt5@log@boost@@V?$basic_simple_event_l og_backend@D@sinks@345@@?$basic_formatting_sink_frontend@D@sinks@v2_mt_nt5@l og@boost@@IAEXABVrecord_view@234@AAVfake_mutex@aux@234@AAV?$basic_simple_eve nt_log_backend@D@1234@@Z) What is wrong? Thanks

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[log] Build fail : log (1.44.0) on vc 11 using cxxflags=-Zc:wchar_t-
by Renato Forti 05 Jul '13

05 Jul '13

Hi All, I need use cxxflags=-Zc:wchar_t-, because I will use boost with my QT project! I build boost like this (debug in this case): bjam toolset=msvc-11.0 variant=debug threading=multi link=shared cxxflags=-Zc:wchar_t- But log lib fail with this: call "C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\vcvarsall.bat" x86 >nul cl /Zm800 -nologo @"..\..\..\bin.v2\libs\log\build\msvc-11.0\debug\threading-mul ti\formatter_parser.obj.rsp" ...failed compile-c-c++ ..\..\..\bin.v2\libs\log\build\msvc-11.0\debug\threading -multi\formatter_parser.obj... ...skipped <p..\..\..\bin.v2\libs\log\build\msvc-11.0\debug\threading-multi>boos t_log_setup-vc110-mt-gd-1_54.dll for lack of <p..\..\..\bin.v2\libs\log\build\ms vc-11.0\debug\threading-multi>boost_log-vc110-mt-gd-1_54.lib... ...skipped <p..\..\..\bin.v2\libs\log\build\msvc-11.0\debug\threading-multi>boos t_log_setup-vc110-mt-gd-1_54.lib for lack of <p..\..\..\bin.v2\libs\log\build\ms vc-11.0\debug\threading-multi>boost_log-vc110-mt-gd-1_54.lib... ...skipped <p..\..\..\bin.v2\libs\log\build\msvc-11.0\debug\threading-multi>boos t_log_setup-vc110-mt-gd-1_54.pdb for lack of <p..\..\..\bin.v2\libs\log\build\ms vc-11.0\debug\threading-multi>boost_log-vc110-mt-gd-1_54.lib... ...failed updating 4 targets... ...skipped 6 targets... Anyone can helpeme? Thanks

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gmp-5.1.2 / boost-1.54 / multiprecision lib
by Fred Schneider 05 Jul '13

05 Jul '13

Hello, I'm a bit of a newbie and I ran into some issues using gmp with boost. After building gmp-5.1.2, I tried to build a simple file: boostMathExample.cpp, based on the documentation (using the multiprecision library + referencing gmp): ////////////////////////////////////////// #include <boost/multiprecision/gmp.hpp> using namespace boost::multiprecision; int main(int argc, const char *argv[]) { mpz_int v = 1; // Do some arithmetic: for (unsigned int i = 1; i <= 1000; ++i) v *= i; std::cout << v << std::endl; } /////////////////////////////////////////////// I received the following missing symbol errors when trying to build: g++ -I ~/Dev/C++/gmp-5.1.2 -I ~/Dev/C++/boost boostMathExample.cpp -O2 -o boostMathExample Undefined symbols: "_main", referenced from: start in crt1.10.6.o "___gmpz_init", referenced from: __static_initialization_and_destruction_0(int, int)in cccOFSnR.o __static_initialization_and_destruction_0(int, int)in cccOFSnR.o "___gmpz_clear", referenced from: ___tcf_1 in cccOFSnR.o __static_initialization_and_destruction_0(int, int)in cccOFSnR.o "___gmpz_set_si", referenced from: __static_initialization_and_destruction_0(int, int)in cccOFSnR.o ld: symbol(s) not found collect2: ld returned 1 exit status ======================================== I'm running the following version of g++: i686-apple-darwin10-g++-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3) I configured gmp, version 5.1.2 with the following flags: ./configure --enable-cxx CXX=g++ CXXFLAGS=-O2 CC=g++ CFLAGS="-g -O2" and then ran "make" and "make check". Any insight would be appreciated. Thanks, Fred

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[algorithm][minmax_element] implementation question
by Michael Marcin 04 Jul '13

04 Jul '13

I was looking at minmax_elemement to try and understand the algorithm. I noticed that the boost implementation looks significantly more complicated than the clang libc++ implementation. Mainly due to the potential_min_result variable that exists in the boost version. Is there a reason for this discrepancy? Is there a bug in the clang implementation? http://llvm.org/svn/llvm-project/libcxx/trunk/include/algorithm http://www.boost.org/doc/libs/1_54_0/boost/algorithm/minmax_element.hpp

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