December 2016 - Boost-users - lists.preview.boost.org

question
by David Bergman 13 Dec '16

13 Dec '16

Is boost capable of parallel processing. That is do wrappers or interfaces exist to call existing parallel versions of functions to help the user/programmer?Thank you, David

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question
by David Bergman 13 Dec '16

13 Dec '16

Does boost handle Bessel functions with imaginary or complex index?Thank you, David

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[C++ Libraries] Is it develop according to SSDLC?
by GAN Kok Leong, Adrian 13 Dec '16

13 Dec '16

Hi, I would like to know whether Boost C++ Libraries version 1.36.0-11.17 is developed and comply with Secure Software Development Life Cycle (SSDLC)? Regards Adrian Gan [This e-mail is confidential and may be privileged. If you are not the intended recipient, please kindly notify us immediately and delete the message from your system; please do not copy or use it for any purpose, nor disclose its contents to any other person. Thank you.] ---ST Electronics Group---

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Unexpected static libraries in Windows build
by Christian Ullrich 06 Dec '16

06 Dec '16

Hello, I have a question about compiling Boost (1.62.0) itself on Windows, with Visual Studio 2015. I want to build DLLs only, but after I run .\b2 link=shared runtime-link=shared [...] install , I have a number of static libraries (libboost_...-mt-1_62.lib) in the lib directory. Specifically: - system - chrono - timer - unit_test_framework - test_exec_monitor - exception The first four also exist as the DLLs I expected to get. From testing some previous Boost releases, it seems that the number of unexpected static libraries increases over time (1.58 only produces two, and more appear with the versions in between that and 1.62). Why are these static libraries built in a shared/shared configuration? Do I need to keep them, or are they some kind of temporary build artifact (used to build others, perhaps)? I have looked through the documentation, mailing list archive, bug tracker, etc., but could not find anything on the subject. If I have not looked hard enough, any pointers will be welcome. I even looked at b2's dependency graph (-d +12), and from that, it appears they are top-level dependencies, but I cannot figure out where _any_ top-level dependencies are defined, let alone these. Thanks for any hints, -- Christian

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[boost.build] how to install boost for arduino ide
by uğur aykar 06 Dec '16

06 Dec '16

>Hello everyone; >I am trying to figure out how to use boost libraries for arduino (avr-gcc). I am so >new to the boost. >I especially want to use lorenz example and compile it with arduino ide. >it requires the odeint library inside the "Boost/numeric/odeint. " which i >downloaded from https://www.codeproject.com/articles/268589/odeint-v-solving-ordinary-diffe… >and dowloaded the whole boost library version boost_1_62_0. >but i couldn't understand how to install for arduino ide. >where should i start? I feel so lost here. Thank you all Ugur Aykar uguraykar(a)hotmail.com

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boost_regex compiler error
by Chris Padwick 06 Dec '16

06 Dec '16

Hi - I am stuck on a linker error with the boost_regex library. My platform is ubuntu 16.04 LTS, arm64, NVIDIA TX1. I downloaded and built boost 1.62.0 with the following parameters: ./bootstrap.sh --prefix=/usr/local sudo ./b2 -d2 architecture=arm address-model=64 install I compiled a simple program using this command line: g++ main.cpp -I/usr/local/include -L/usr/local/lib -lboost_regex Here is the program: #include <boost/regex.hpp> #include <iostream> using namespace std; int main(int argc, char *argv[]) { static const boost::regex rxInt("[0-9]+"); string word = "foobar"; if(boost::regex_match(word, rxInt)) { cout << "Integer" << endl; } else { cout << "Not integer" << endl; } return 0; } Here are the linker errors: /tmp/ccuOD7Zj.o: In function `bool boost::regex_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)': main.cpp:(.text._ZN5boost11regex_matchIN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESaINS_9sub_matchISB_EEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEbT_SJ_RNS_13match_resultsISJ_T0_EERKNS_11basic_regexIT1_T2_EENS_15regex_constants12_match_flagsE[_ZN5boost11regex_matchIN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESaINS_9sub_matchISB_EEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEbT_SJ_RNS_13match_resultsISJ_T0_EERKNS_11basic_regexIT1_T2_EENS_15regex_constants12_match_flagsE]+0x58): undefined reference to `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::match()' /tmp/ccuOD7Zj.o: In function `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::perl_matcher(__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >)': main.cpp:(.text._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESaINS_9sub_matchISC_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEC2ESC_SC_RNS_13match_resultsISC_SF_EERKNS_11basic_regexIcSJ_EENS_15regex_constants12_match_flagsESC_[_ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESaINS_9sub_matchISC_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEC5ESC_SC_RNS_13match_resultsISC_SF_EERKNS_11basic_regexIcSJ_EENS_15regex_constants12_match_flagsESC_]+0xf8): undefined reference to `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)' collect2: error: ld returned 1 exit status Any hints would be appreciated. Should I try to use an earlier version of boost? thank you!

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[test] Really deactivate test
by Florian Lindner 05 Dec '16

05 Dec '16

Hello, I need to conditionally decativate tests and use a custom decorator for that, like that: virtual void apply(bt::test_unit& tu) { [...] if (std::find(_ranks.begin(), _ranks.end(), rank) == _ranks.end()) { std::cout << rank << " Disable, because of rank, test: " << tu.full_name() << std::endl; tu.p_default_status.value = bt::test_unit::RS_DISABLED; return; } } (i'm happy to provide full source code, if anyone is interested) As you can see it's deativated on some MPI ranks only. However, if a user uses -t "testname" it is activated again. Is there a way to really deactivate the test? Or delete it from the test tree? Thanks, Florian

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VS 2017 RC + boost.context
by Michael Steinberg 05 Dec '16

05 Dec '16

Hi there, I'm trying to build boost with VS 2017 RC but run into problems building boost.context. The project jam file somehow triggers to build the "unsupported.cpp", but I'm not proficient enough with the build system to find out how I can circumvent that. I would be very grateful if somebody could help me out with this. Cheers! Michael

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[Boost.Container] Performance of static_vector with default_init_t
by dariomt＠gmail.com 04 Dec '16

04 Dec '16

Hi, I'm constructing a static_vector<double,N>(n, default_init). I was expecting the constructor call to vanish into just setting the start pointer and the size & capacity members (and verifying n<=N). However, the profiler is showing some time spent in the loop inside uninitialized_default_init_alloc_n (boost/container/detail/utilities.hpp:678) For a builtin type and default_init_t, why do we even need to invoke the allocator? Can't we just leave the memory uninitialized? This is with Boost 1.55 and VS2008 Thanks in advance

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[Boost.Signals2] Problem with cleanup when disconnecting from slot.
by Paul Blampspied 03 Dec '16

03 Dec '16

Am I right in thinking that when a signal is connected to a closure created by boost::bind, then the closure should be destructed when the connection is closed ? I am having trouble because I pass a boost::shared_ptr in the closure. The use count does not drop when the signal connection is closed (the signal is connected to a one-shot slot which closes the connection). As a result the shared_ptr never deletes its data causing a memory leak. I have seen a few mentions of bugs in signals2 with respect to object destruction on connection termination. Perhaps I have fallen foul of that. It seems quite a serious bug though considering the general standard of boost. Given that the one-shot slot receives the shared_ptr I am considering a hack to fix the problem - explicitly break into the shared_ptr and decrement the reference count that I believe should be decremented by conn.disconnect(). Is there a better way ?

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