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Is it Okay to Use the Boost Logo?
by stellarpower＠googlemail.com 19 May '15

19 May '15

Hello all, Just a quick question, as I couldn't find any compiled binaries for mingw32 I ended up compiling Boost and I was thinking of putting the compiled libraries online, probably on Sourceforge, to save others from the effort. Of course, I'll be making it clear that they're not official or anything. Is it okay for me to use the Boost logo on the project page? Thanks

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"see reference to class template instantiation '...' being compiled" was shown
by Kaosun DJ 19 May '15

19 May '15

Hello, When I executed b2.exe, a message as "see reference to class template instantiation '...' being compiled" was shown. Were any libraries required? My environment is - Windows 8.1 64 bit (version 6.3 build 9600) (ja-JP) - Microsoft Visual Studio Express 2013 for Windows Desktop (version 12.0.30723.00 Update 3) (ja-JP) The reply of b2.exe is as follows. compile-c-c++ bin.v2\libs\serialization\build\msvc-12.0\debug\link-static\runtime-link-static\threading-multi\xml_grammar.obj xml_grammar.cpp C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2798) : warning C4996: 'std::_Equal1': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2783) : see declaration of 'std::_Equal1' c:\users\kaosun.earthgroove\downloads\temp\boost_1_58_0\libs\serialization\src\basic_xml_grammar.ipp(452) : see reference to class template instantiation 'bool std::equal<std::_String_iterator<std::_String_val<std::_Simple_types<char>>>,const char*>(_InIt1,_InIt1,_InIt2)' being compiled with [ _InIt1=std::_String_iterator<std::_String_val<std::_Simple_types<char>>> , _InIt2=const char * ] c:\users\kaosun.earthgroove\downloads\temp\boost_1_58_0\libs\serialization\src\basic_xml_grammar.ipp(438): while compiling class template member function 'void boost::archive::basic_xml_grammar<char>::init(std::basic_istream<char,std::char_traits<char>> &)' libs\serialization\src\xml_grammar.cpp(51) : see reference to class template instantiation 'boost::archive::basic_xml_grammar<char>' being compiled : : Snip : : compile-c-c++ bin.v2\libs\serialization\build\msvc-12.0\debug\link-static\runtime-link-static\threading-multi\xml_iarchive.obj xml_iarchive.cpp C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2798) : warning C4996: 'std::_Equal1': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2783) : see declaration of 'std::_Equal1' C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/impl/basic_xml_iarchive.ipp(67) : see reference to class template instantiation 'bool std::equal<std::_String_iterator<std::_String_val<std::_Simple_types<char>>>,const char*>(_InIt1,_InIt1,_InIt2)' being compiled with [ _InIt1=std::_String_iterator<std::_String_val<std::_Simple_types<char>>> , _InIt2=const char * ] C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/impl/basic_xml_iarchive.ipp(45): while compiling class template member function 'void boost::archive::basic_xml_iarchive<Archive>::load_end(const char *)' with [ Archive=boost::archive::xml_iarchive ] C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/xml_iarchive.hpp(50) : see reference to class template instantiation 'boost::archive::basic_xml_iarchive<Archive>' being compiled with [ Archive=boost::archive::xml_iarchive ] C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/xml_iarchive.hpp(132) : see reference to class template instantiation 'boost::archive::xml_iarchive_impl<boost::archive::xml_iarchive>' being compiled compile-c-c++ bin.v2\libs\serialization\build\msvc-12.0\debug\link-static\runtime-link-static\threading-multi\xml_oarchive.obj xml_oarchive.cpp C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2132) : warning C4996: 'std::_Copy_impl': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2113) : see declaration of 'std::_Copy_impl' C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/impl/xml_oarchive_impl.ipp(84) : see reference to class template instantiation '_OutIt std::copy<boost::archive::iterators::xml_escape<const char *>,boost::archive::iterators::ostream_iterator<char>>(_InIt,_InIt,_OutIt)' being compiled with [ _OutIt=boost::archive::iterators::ostream_iterator<char> , _InIt=boost::archive::iterators::xml_escape<const char *> ] C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/impl/xml_oarchive_impl.ipp(74): while compiling class template member function 'void boost::archive::xml_oarchive_impl<boost::archive::xml_oarchive>::save(const std::string &)' C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/xml_oarchive.hpp(123) : see reference to class template instantiation 'boost::archive::xml_oarchive_impl<boost::archive::xml_oarchive>' being compiled C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2113) : see declaration of 'std::_Copy_impl' C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/iterators/mb_from_wchar.hpp(91) : warning C4996: 'wctomb': This function or variable may be unsafe. Consider using wctomb_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\stdlib.h(567) : see declaration of 'wctomb' C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/iterators/mb_from_wchar.hpp(85): while compiling class template member function 'void boost::archive::iterators::mb_from_wchar<boost::archive::iterators::xml_escape<InputIterator>>::fill(void)' with [ InputIterator=const wchar_t * ] C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/iterators/mb_from_wchar.hpp(65) : see reference to class template instantiation 'void boost::archive::iterators::mb_from_wchar<boost::archive::iterators::xml_escape<InputIterator>>::fill(void)' being compiled with [ InputIterator=const wchar_t * ] C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/impl/xml_oarchive_impl.ipp(45) : see reference to class template instantiation 'boost::archive::iterators::mb_from_wchar<boost::archive::iterators::xml_escape<InputIterator>>' being compiled with [ InputIterator=const wchar_t * ] : : Snip : : compile-c-c++ bin.v2\libs\serialization\build\msvc-12.0\debug\link-static\runtime-link-static\threading-multi\basic_text_woprimitive.obj basic_text_woprimitive.cpp C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2132) : warning C4996: 'std::_Copy_impl': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2113) : see declaration of 'std::_Copy_impl' C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/impl/basic_text_oprimitive.ipp(67) : see reference to class template instantiation '_OutIt std::copy<boost::archive::iterators::insert_linebreaks<boost::archive::iterators::base64_from_binary<boost::archive::iterators::transform_width<const char *,6,8,char>,char>,76,const char>,boost::archive::iterators::ostream_iterator<CharType>>(_InIt,_InIt,_OutIt)' being compiled with [ _OutIt=boost::archive::iterators::ostream_iterator<CharType> , _InIt=boost::archive::iterators::insert_linebreaks<boost::archive::iterators::base64_from_binary<boost::archive::iterators::transform_width<const char *,6,8,char>,char>,76,const char> ] C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/impl/basic_text_oprimitive.ipp(33): while compiling class template member function 'void boost::archive::basic_text_oprimitive<std::wostream>::save_binary(const void *,size_t)' libs\serialization\src\basic_text_woprimitive.cpp(30) : see reference to class template instantiation 'boost::archive::basic_text_oprimitive<std::wostream>' being compiled compile-c-c++ bin.v2\libs\serialization\build\msvc-12.0\debug\link-static\runtime-link-static\threading-multi\text_wiarchive.obj text_wiarchive.cpp compile-c-c++ bin.v2\libs\serialization\build\msvc-12.0\debug\link-static\runtime-link-static\threading-multi\text_woarchive.obj text_woarchive.cpp compile-c-c++ bin.v2\libs\serialization\build\msvc-12.0\debug\link-static\runtime-link-static\threading-multi\utf8_codecvt_facet.obj utf8_codecvt_facet.cpp compile-c-c++ bin.v2\libs\serialization\build\msvc-12.0\debug\link-static\runtime-link-static\threading-multi\xml_wgrammar.obj xml_wgrammar.cpp C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2798) : warning C4996: 'std::_Equal1': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2783) : see declaration of 'std::_Equal1' c:\users\kaosun.earthgroove\downloads\temp\boost_1_58_0\libs\serialization\src\basic_xml_grammar.ipp(452) : see reference to class template instantiation 'bool std::equal<std::_String_iterator<std::_String_val<std::_Simple_types<wchar_t>>>,const char*>(_InIt1,_InIt1,_InIt2)' being compiled with [ _InIt1=std::_String_iterator<std::_String_val<std::_Simple_types<wchar_t>>> , _InIt2=const char * ] c:\users\kaosun.earthgroove\downloads\temp\boost_1_58_0\libs\serialization\src\basic_xml_grammar.ipp(438): while compiling class template member function 'void boost::archive::basic_xml_grammar<wchar_t>::init(std::basic_istream<wchar_t,std::char_traits<wchar_t>> &)' libs\serialization\src\xml_wgrammar.cpp(51) : see reference to class template instantiation 'boost::archive::basic_xml_grammar<wchar_t>' being compiled compile-c-c++ bin.v2\libs\serialization\build\msvc-12.0\debug\link-static\runtime-link-static\threading-multi\xml_wiarchive.obj xml_wiarchive.cpp C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2132) : warning C4996: 'std::_Copy_impl': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2113) : see declaration of 'std::_Copy_impl' C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/impl/xml_wiarchive_impl.ipp(61) : see reference to class template instantiation '_OutIt std::copy<boost::archive::iterators::mb_from_wchar<std::_String_const_iterator<std::_String_val<std::_Simple_types<wchar_t>>>>,char*>(_InIt,_InIt,_OutIt)' being compiled with [ _OutIt=char * , _InIt=boost::archive::iterators::mb_from_wchar<std::_String_const_iterator<std::_String_val<std::_Simple_types<wchar_t>>>> ] C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2798) : warning C4996: 'std::_Equal1': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2783) : see declaration of 'std::_Equal1' C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/impl/basic_xml_iarchive.ipp(67) : see reference to class template instantiation 'bool std::equal<std::_String_iterator<std::_String_val<std::_Simple_types<wchar_t>>>,const char*>(_InIt1,_InIt1,_InIt2)' being compiled with [ _InIt1=std::_String_iterator<std::_String_val<std::_Simple_types<wchar_t>>> , _InIt2=const char * ] C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/impl/basic_xml_iarchive.ipp(45): while compiling class template member function 'void boost::archive::basic_xml_iarchive<Archive>::load_end(const char *)' with [ Archive=boost::archive::xml_wiarchive ] C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/xml_wiarchive.hpp(64) : see reference to class template instantiation 'boost::archive::basic_xml_iarchive<Archive>' being compiled with [ Archive=boost::archive::xml_wiarchive ] C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/xml_wiarchive.hpp(146) : see reference to class template instantiation 'boost::archive::xml_wiarchive_impl<boost::archive::xml_wiarchive>' being compiled C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/iterators/mb_from_wchar.hpp(91) : warning C4996: 'wctomb': This function or variable may be unsafe. Consider using wctomb_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\stdlib.h(567) : see declaration of 'wctomb' C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/iterators/mb_from_wchar.hpp(85): while compiling class template member function 'void boost::archive::iterators::mb_from_wchar<std::_String_const_iterator<std::_String_val<std::_Simple_types<wchar_t>>>>::fill(void)' C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/iterators/mb_from_wchar.hpp(65) : see reference to class template instantiation 'void boost::archive::iterators::mb_from_wchar<std::_String_const_iterator<std::_String_val<std::_Simple_types<wchar_t>>>>::fill(void)' being compiled C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/impl/xml_wiarchive_impl.ipp(56) : see reference to class template instantiation 'boost::archive::iterators::mb_from_wchar<std::_String_const_iterator<std::_String_val<std::_Simple_types<wchar_t>>>>' being compiled compile-c-c++ bin.v2\libs\serialization\build\msvc-12.0\debug\link-static\runtime-link-static\threading-multi\xml_woarchive.obj xml_woarchive.cpp C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2132) : warning C4996: 'std::_Copy_impl': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2113) : see declaration of 'std::_Copy_impl' C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/impl/xml_woarchive_impl.ipp(89) : see reference to class template instantiation '_OutIt std::copy<boost::archive::iterators::xml_escape<const wchar_t *>,boost::archive::iterators::ostream_iterator<wchar_t>>(_InIt,_InIt,_OutIt)' being compiled with [ _OutIt=boost::archive::iterators::ostream_iterator<wchar_t> , _InIt=boost::archive::iterators::xml_escape<const wchar_t *> ] C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/impl/xml_woarchive_impl.ipp(75): while compiling class template member function 'void boost::archive::xml_woarchive_impl<boost::archive::xml_woarchive>::save(const std::wstring &)' C:\Users\kaosun.EARTHGROOVE\Downloads\temp\boost_1_58_0\boost/archive/xml_woarchive.hpp(140) : see reference to class template instantiation 'boost::archive::xml_woarchive_impl<boost::archive::xml_woarchive>' being compiled C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\xutility(2113) : see declaration of 'std::_Copy_impl' : : Snip : : compile-c-c++ bin.v2\libs\serialization\build\msvc-12.0\release\link-static\runtime-link-static\threading-multi\xml_oarchive.obj xml_oarchive.cpp .\boost/archive/iterators/mb_from_wchar.hpp(91) : warning C4996: 'wctomb': This function or variable may be unsafe. Consider using wctomb_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\stdlib.h(567) : see declaration of 'wctomb' .\boost/archive/iterators/mb_from_wchar.hpp(85): while compiling class template member function 'void boost::archive::iterators::mb_from_wchar<boost::archive::iterators::xml_escape<InputIterator>>::fill(void)' with [ InputIterator=const wchar_t * ] .\boost/archive/iterators/mb_from_wchar.hpp(65) : see reference to class template instantiation 'void boost::archive::iterators::mb_from_wchar<boost::archive::iterators::xml_escape<InputIterator>>::fill(void)' being compiled with [ InputIterator=const wchar_t * ] .\boost/archive/impl/xml_oarchive_impl.ipp(45) : see reference to class template instantiation 'boost::archive::iterators::mb_from_wchar<boost::archive::iterators::xml_escape<InputIterator>>' being compiled with [ InputIterator=const wchar_t * ] .\boost/archive/impl/xml_oarchive_impl.ipp(58) : see reference to class template instantiation 'void boost::archive::save_iterator<const _Elem*>(std::ostream &,InputIterator,InputIterator)' being compiled with [ _Elem=wchar_t , InputIterator=const wchar_t * ] .\boost/archive/impl/xml_oarchive_impl.ipp(54): while compiling class template member function 'void boost::archive::xml_oarchive_impl<boost::archive::xml_oarchive>::save(const std::wstring &)' .\boost/archive/xml_oarchive.hpp(123) : see reference to class template instantiation 'boost::archive::xml_oarchive_impl<boost::archive::xml_oarchive>' being compiled : : Snip : : compile-c-c++ bin.v2\libs\serialization\build\msvc-12.0\release\link-static\runtime-link-static\threading-multi\xml_wiarchive.obj xml_wiarchive.cpp .\boost/archive/iterators/mb_from_wchar.hpp(91) : warning C4996: 'wctomb': This function or variable may be unsafe. Consider using wctomb_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\stdlib.h(567) : see declaration of 'wctomb' .\boost/archive/iterators/mb_from_wchar.hpp(85): while compiling class template member function 'void boost::archive::iterators::mb_from_wchar<std::_String_const_iterator<std::_String_val<std::_Simple_types<wchar_t>>>>::fill(void)' .\boost/archive/iterators/mb_from_wchar.hpp(65) : see reference to class template instantiation 'void boost::archive::iterators::mb_from_wchar<std::_String_const_iterator<std::_String_val<std::_Simple_types<wchar_t>>>>::fill(void)' being compiled .\boost/archive/impl/xml_wiarchive_impl.ipp(56) : see reference to class template instantiation 'boost::archive::iterators::mb_from_wchar<std::_String_const_iterator<std::_String_val<std::_Simple_types<wchar_t>>>>' being compiled

2 2

[thread] Do we can a non backward compatible version with non-blocking futures?
by Vicente J. Botet Escriba 18 May '15

18 May '15

Hi, in Boost 1.58 I fixed some issues as the result of the async and future<T>:then() was not a blocking future as the documentation described. However the implementation is horrible and I suspect that it is subject to deadlocks. BTW, I added already some fixes on the develop branch. Sometime ago I started in a branch an implementation that don't use blocking futures [1]. Well the implementation is also horrible after making futures non-blocking, but less ;-) The problem is that now I have some issues with the executors :( Anyway, Gor has told me that with the blocking implementation he is unable to define await_suspend (using resumable functions) >It is just if .then returns a blocking future, I cannot subscribe a callback to .then in await_suspend. >await_suspend(f, cb) { > f.then(cb); >} &will block here preventing coroutine from suspending I don't know yet if he will reach to configure boost::future<T> on the non-blocking branch. My question is if the Boost community will accept (or even wants) a breaking change on a near release (when I would reach to fix the executors issues) including non-blocking futures instead of the current blocking futures. Best, Vicente [1] https://github.com/boostorg/thread/tree/feature/non_blocking_futures

1 0

Broken web site documentation link
by Bennet Fauber 18 May '15

18 May '15

>From this page, http://www.boost.org/doc/libs/1_58_0/tools/build/index.html there is a link called "Documentation" under the Boost Build graphic that purports to link to http://www.boost.org/doc/libs/1_58_0/tools/build/doc/html/index.html but clicking on that link yields the following web page: ========================== 404 Not Found File "/home/www/live.boost.org/common/code/../../doc/archives/boost_1_58_0/tools/build/doc/html/index.html" not found. Unable to find file. ========================== Sorry for posting to the wrong place is if this is not it. -- bennet

1 0

Boost Phoenix & language lambdas
by Robert Jones 16 May '15

16 May '15

I'm sure this has been asked before, and apologies in advance to the programming gods of Boost.Phoenix, but has Phoenix effectively been replaced by language lambdas, or are there still things for which Phoenix is the best answer? Thx, Rob.

3 2

Some strange boost headers errors
by alfonso santimone 15 May '15

15 May '15

Hi guys, i'm a boost newbie. I've got to include boost libraries in the include path of a VisualStudio 2012 project. When i try to compile i have all these errors. Every errors is related to missing headers ( boost ones and even standard Win ones ) and to synthax errors depending on missing headers i guess. Do someone have any idea on what's wrong here? I just post here a few lines of errors, but the other ones are all of the same kind Error 1 error C2061: syntax error : identifier 'boost' C:\boost_1_57_0\boost\core\ checked_delete.hpp 24 1 csound~ Error 2 error C2059: syntax error : ';' C:\boost_1_57_0\boost\core\checked_delete.hpp 24 1 csound~ Error 3 error C2449: found '{' at file scope (missing function header?) C:\boost_1_57_0\boost\core\checked_delete.hpp 25 1 csound~ Error 4 error C2059: syntax error : '}' C:\boost_1_57_0\boost\core\checked_delete.hpp 67 1 csound~ Error 5 error C2054: expected '(' to follow 'using' C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cstddef 19 1 csound~ Error 6 error C2061: syntax error : identifier 'using' C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cstddef 19 1 csound~ Error 7 error C2061: syntax error : identifier 'boost' C:\boost_1_57_0\boost\smart_ptr\detail\sp_nullptr_t.hpp 23 1 csound~ Error 8 error C2059: syntax error : ';' C:\boost_1_57_0\boost\smart_ptr\detail\sp_nullptr_t.hpp 23 1 csound~ Error 9 error C2449: found '{' at file scope (missing function header?) C:\boost_1_57_0\boost\smart_ptr\detail\sp_nullptr_t.hpp 24 1 csound~ Error 10 error C2059: syntax error : '}' C:\boost_1_57_0\boost\smart_ptr\detail\sp_nullptr_t.hpp 41 1 csound~ Error 11 error C2054: expected '(' to follow 'using' C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cstdlib 19 1 csound~ Error 12 error C2061: syntax error : identifier 'using' C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cstdlib 19 1 csound~ Error 13 error C2061: syntax error : identifier 'abort' C:\Program Files (x86)\Microsoft Visual Studio many thanks in advance bests alfonso www.elgallorojorecords.com soundcloud.com/alfonsosantimone www.facebook.com/alfonsosantimone

5 11

[flyweights] private constructor, friend access
by r＠primef.actor 15 May '15

15 May '15

Dear all, On a project of mine, I started to use Boost.Flyweight. I would like users of my class to only be able to instantiate objects of my class by using the Boost.Flyweight mechanism. For this, I make my class constructor private. However, when doing so the corresponding flyweight factory also cannot instantiate my class. What classes do I need to `friend` in order to make this work? Here's a small self-contained example of the problem: class X { public: int data() const { return m_data; } struct key_extractor { int operator()(const X& x) const { return x.data(); } } typedef boost::flyweights::flyweight < boost::flyweights::keyvalue < int, X, key_extractor > > flyweight; private: int m_data; X(int x) : m_data(x) {} // friend declarations should go here }; int main() { auto my_x = X::flyweight(42); return 0; } Kind regards, Raoul Wols

2 1

boost `help
by Uthpal Urubail 14 May '15

14 May '15

Experts, Is there a direct way in boost to group numbers by deviation (by given percentage)? Regards, UJ

3 2

Managed shared memory size restrictions
by Veranika Liaukevich 14 May '15

14 May '15

Hello everybody, Is there any restriction to the size of managed shared memory regions? Should it be in multiples of the page size? I did not manage to find any relevant information in the documentation, but managed_shared_memory creation and managed_shared_memory::grow sometimes fail with small memory sizes specified. Examples: 1) When I create a managed_shared_memory segment with size 40, the creation fails with interprocess_exception::library_error. 2) I created managed_shared_memory with initial size 1000, then increased the size by 24 bytes, I got this: /usr/include/boost/interprocess/mem_algo/rbtree_best_fit.hpp:514: void boost::interprocess::rbtree_best_fit<MutexFamily, VoidMutex, MemAlignment>::grow(boost::interprocess::rbtree_best_fit<MutexFamily, VoidMutex, MemAlignment>::size_type) [with MutexFamily = boost::interprocess::mutex_family; VoidPointer = boost::interprocess::offset_ptr<void>; long unsigned int MemAlignment = 0ul; boost::interprocess::rbtree_best_fit<MutexFamily, VoidMutex, MemAlignment>::size_type = long unsigned int]: Assertion `new_block->m_size >= BlockCtrlUnits' failed. Aborted (core dumped) I use boost 1.55.0 on Ubuntu 14.04 64bit. Code used for testing: #include <boost/interprocess/managed_shared_memory.hpp> const char *shmname = "MyBoostShmTest"; // Usage: ./progname [init-memory-size] [grow-memory-size] int main(int argc, char **argv) { using namespace boost::interprocess; struct shm_remove { shm_remove() { shared_memory_object::remove(shmname); } ~shm_remove(){ shared_memory_object::remove(shmname); } } remover; size_t size = atoi(argv[1]); size_t grow_size = atoi(argv[2]); { managed_shared_memory segment(create_only, shmname, size); } { managed_shared_memory::grow(shmname, grow_size); } return 0; } Thanks, Veranika

1 0

[bccl] how to use predefined concepts to restrict a template argument via sfinae
by Nick Stokes 13 May '15

13 May '15

The use case is from Boost Graph, but my question is a general one about Boost Concept Check Library: How to "restrict" a template class/function argument based on concepts. For instance, I want to overload functions based on Graph or VertexListGraph or similar refinement. template<class VertexListGraph, XXX > void foo( VertexListGraph& g ) {...} where XXX is somekind of SFINAE that leverages boost::VertexListGraphConcept. Thanks, Nick

2 1

[BGL] pull requests?
by Mads Jensen 13 May '15

13 May '15

Hi, I don't know if this is the right list to send this to. However, there is a fair amount of trivial pull requests for the Boost Graph Library. Most of which address small errors in the documentation. There hasn't been any activity in that repository since August last year. Can someone with write access please have a look at it? -- Med venlig hilsen / Kind regards, Mads Jensen Life holds no terrors when you have embraced the philosophy of flipism! -- Carl Barks (Walt Disney Comics & Stories 149)

1 0

Boost.Coroutine Debian package
by Konrad Zemek 13 May '15

13 May '15

Hey everyone, I have asked this question the person who introduced Boost.Coroutine in the Debian package (control files can be found in debian svn repository [1]) a few days ago but have not received a reply: Does anyone happen to know why - for Debian package - Boost.Coroutine is built as a static library only? Our project prefers dynamic linking, and we also need -fPIC since we're building shared libraries as well, yet Boost.Coroutine is one of two libraries (the other one being Boost.Exception) built only as a non-fPIC static version. I have modified the control files to enable building libboost_coroutine.so, and we're currently using it for our project seemingly without any problem, but it worries me that there must have been a reason for the special treatment of Boost.Coroutine package. And a "by the way" question if anyone happens to know, I'm curious why Debian unstable still provides Boost 1.55 as the newest version? [1] svn://anonscm.debian.org/pkg-boost/boost Konrad

1 0

[Geometry] warnings
by PB 12 May '15

12 May '15

Hello, Using Boost 1.58 on VC9 (MSVC++ 2008) compiling a small program generates warnings in the Geometry headers in Release and Debug modes. Please let me know if this is a Boost.Geometry issue or something I'm not doing correctly. The program source ================= #include <boost/geometry.hpp> #include <boost/geometry/geometries/geometries.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/geometries/polygon.hpp> typedef boost::geometry::model::d2::point_xy<double> point; typedef boost::geometry::model::polygon<point,false> polygon; typedef boost::geometry::model::linestring<point> polyline; int main() { polygon green, blue; green.outer().push_back(point(-1.0, 1.0)); green.outer().push_back(point(1.0, 1.0)); green.outer().push_back(point(1.0, -1.0)); green.outer().push_back(point(-1.0, -1.0)); blue.outer().push_back(point(0.5, 0.5)); blue.outer().push_back(point(0.5, 1.5)); blue.outer().push_back(point(1.5, 1.5)); blue.outer().push_back(point(1.5, 0.5)); std::vector<polygon> output; boost::geometry::intersection(blue, green, output); } Warning summary ============== Warning 1 warning C4244: 'initializing' : conversion from 'const coordinate_type' to 'const promoted_type', possible loss of data c:\releases\lib\boost\boost_1_58_0\include\boost\geometry\strategies\cartesian\side_by_triangle.hpp 96 Warning 2 warning C4244: 'initializing' : conversion from 'const coordinate_type' to 'const promoted_type', possible loss of data c:\releases\lib\boost\boost_1_58_0\include\boost\geometry\strategies\cartesian\side_by_triangle.hpp 97 Warning 3 warning C4244: 'initializing' : conversion from 'const coordinate_type' to 'const promoted_type', possible loss of data c:\releases\lib\boost\boost_1_58_0\include\boost\geometry\strategies\cartesian\side_by_triangle.hpp 98 Warning 4 warning C4244: 'initializing' : conversion from 'const coordinate_type' to 'const promoted_type', possible loss of data c:\releases\lib\boost\boost_1_58_0\include\boost\geometry\strategies\cartesian\side_by_triangle.hpp 99 Warning 5 warning C4244: 'argument' : conversion from '__int64' to 'const double', possible loss of data c:\releases\lib\boost\boost_1_58_0\include\boost\geometry\algorithms\detail\recalculate.hpp 51 Warning 6 warning C4244: 'argument' : conversion from '__int64' to 'const double', possible loss of data c:\releases\lib\boost\boost_1_58_0\include\boost\geometry\algorithms\detail\recalculate.hpp 51 Warning 7 warning C4244: 'initializing' : conversion from '__int64' to 'const coordinate_type', possible loss of data c:\releases\lib\boost\boost_1_58_0\include\boost\geometry\strategies\cartesian\side_by_triangle.hpp 88 Warning 8 warning C4244: 'initializing' : conversion from '__int64' to 'const coordinate_type', possible loss of data c:\releases\lib\boost\boost_1_58_0\include\boost\geometry\strategies\cartesian\side_by_triangle.hpp 89 Warning 9 warning C4244: 'initializing' : conversion from '__int64' to 'const coordinate_type', possible loss of data c:\releases\lib\boost\boost_1_58_0\include\boost\geometry\strategies\cartesian\side_by_triangle.hpp 91 Warning 10 warning C4244: 'initializing' : conversion from '__int64' to 'const coordinate_type', possible loss of data c:\releases\lib\boost\boost_1_58_0\include\boost\geometry\strategies\cartesian\side_by_triangle.hpp 92 Warning 11 warning C4244: 'initializing' : conversion from '__int64' to 'const coordinate_type', possible loss of data c:\releases\lib\boost\boost_1_58_0\include\boost\geometry\strategies\cartesian\side_by_triangle.hpp 93 Warning 12 warning C4244: 'initializing' : conversion from '__int64' to 'const coordinate_type', possible loss of data c:\releases\lib\boost\boost_1_58_0\include\boost\geometry\strategies\cartesian\side_by_triangle.hpp 94 Warnings in more detail =============== 1>------ Build started: Project: boost_geom_warnings, Configuration: Release Win32 ------ 1>Compiling... 1>main.cpp 1>c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(96) : warning C4244: 'initializing' : conversion from 'const coordinate_type' to 'const promoted_type', possible loss of data 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(138) : see reference to function template instantiation 'PromotedType boost::geometry::strategy::side::side_by_triangle<>::side_value<CoordinateType,PromotedType,P1,P2,P,EpsPolicy>(const P1 &,const P2 &,const P &,EpsPolicy &)' being compiled 1> with 1> [ 1> PromotedType=promoted_type, 1> CoordinateType=coordinate_type, 1> P1=robust_point_type, 1> P2=robust_point_type, 1> P=robust_point_type, 1> EpsPolicy=boost::geometry::strategy::side::side_by_triangle<>::eps_policy<boost::geometry::math::detail::equals_factor_policy<promoted_type>> 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(234) : see reference to function template instantiation 'PromotedType boost::geometry::strategy::side::side_by_triangle<>::compute_side_value<CoordinateType,PromotedType,AreAllIntegralCoordinates>::apply<P1,P2,P,boost::geometry::strategy::side::side_by_triangle<>::eps_policy<Policy>>(const P1 &,const P2 &,const P &,EpsPolicy &)' being compiled 1> with 1> [ 1> PromotedType=promoted_type, 1> CoordinateType=coordinate_type, 1> AreAllIntegralCoordinates=true, 1> P1=robust_point_type, 1> P2=robust_point_type, 1> P=robust_point_type, 1> Policy=boost::geometry::math::detail::equals_factor_policy<promoted_type>, 1> EpsPolicy=boost::geometry::strategy::side::side_by_triangle<>::eps_policy<boost::geometry::math::detail::equals_factor_policy<promoted_type>> 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/point_is_spike_or_equal.hpp(51) : see reference to function template instantiation 'int boost::geometry::strategy::side::side_by_triangle<>::apply<Point1,Point2,Point3>(const P1 &,const P2 &,const P &)' being compiled 1> with 1> [ 1> Point1=robust_point_type, 1> Point2=robust_point_type, 1> Point3=robust_point_type, 1> P1=robust_point_type, 1> P2=robust_point_type, 1> P=robust_point_type 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/point_is_spike_or_equal.hpp(117) : see reference to function template instantiation 'bool boost::geometry::detail::point_is_spike_or_equal<robust_point_type,robust_point_type,robust_point_type>(const Point1 &,const Point2 &,const Point3 &)' being compiled 1> with 1> [ 1> Point1=robust_point_type, 1> Point2=robust_point_type, 1> Point3=robust_point_type 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/append_no_dups_or_spikes.hpp(95) : see reference to function template instantiation 'bool boost::geometry::detail::point_is_spike_or_equal<Point,boost::geometry::model::d2::point_xy<CoordinateType>,boost::geometry::model::d2::point_xy<CoordinateType>,RobustPolicy>(const Point1 &,const Point2 &,const Point3 &,const RobustPolicy &)' being compiled 1> with 1> [ 1> Point=point_type, 1> CoordinateType=double, 1> RobustPolicy=rescale_policy_type, 1> Point1=point_type, 1> Point2=boost::geometry::model::d2::point_xy<double>, 1> Point3=boost::geometry::model::d2::point_xy<double> 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/traverse.hpp(289) : see reference to function template instantiation 'void boost::geometry::detail::overlay::append_no_dups_or_spikes<ring_type,Point,RobustPolicy>(Range &,const Point &,const RobustPolicy &)' being compiled 1> with 1> [ 1> Point=point_type, 1> RobustPolicy=rescale_policy_type, 1> Range=ring_type 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/overlay.hpp(232) : see reference to function template instantiation 'void boost::geometry::detail::overlay::traverse<Reverse1,Reverse2,Geometry1,Geometry2>::apply<RobustPolicy,container_type,ring_container_type>(const Geometry1 &,const Geometry2 &,boost::geometry::detail::overlay::operation_type,const RobustPolicy &,Turns &,Rings &)' being compiled 1> with 1> [ 1> Reverse1=true, 1> Reverse2=true, 1> Geometry1=polygon, 1> Geometry2=polygon, 1> RobustPolicy=rescale_policy_type, 1> Turns=container_type, 1> Rings=ring_container_type 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/intersection/interface.hpp(57) : see reference to function template instantiation 'OutputIterator boost::geometry::detail::overlay::overlay<Geometry1,Geometry2,Reverse1,Reverse2,ReverseOut,GeometryOut,Direction>::apply<RobustPolicy,std::back_insert_iterator<_Container>,Strategy>(const Geometry1 &,const Geometry2 &,const RobustPolicy &,OutputIterator,const Strategy &)' being compiled 1> with 1> [ 1> OutputIterator=std::back_insert_iterator<std::vector<polygon>>, 1> Geometry1=polygon, 1> Geometry2=polygon, 1> Reverse1=true, 1> Reverse2=true, 1> ReverseOut=true, 1> GeometryOut=OneOut, 1> Direction=overlay_intersection, 1> RobustPolicy=rescale_policy_type, 1> _Container=std::vector<polygon>, 1> Strategy=boost::geometry::strategy_intersection<boost::geometry::cartesian_tag,polygon,polygon,boost::geometry::model::d2::point_xy<double>,rescale_policy_type> 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/intersection/interface.hpp(138) : see reference to function template instantiation 'bool boost::geometry::dispatch::intersection<Geometry1,Geometry2>::apply<rescale_policy_type,GeometryOut,boost::geometry::strategy_intersection<Tag,Geometry1,Geometry2,IntersectionPoint,RobustPolicy>>(const Geometry1 &,const Geometry2 &,const RobustPolicy &,GeometryOut &,const Strategy &)' being compiled 1> with 1> [ 1> Geometry1=polygon, 1> Geometry2=polygon, 1> GeometryOut=std::vector<polygon>, 1> Tag=boost::geometry::cartesian_tag, 1> IntersectionPoint=boost::geometry::model::d2::point_xy<double>, 1> RobustPolicy=rescale_policy_type, 1> Strategy=boost::geometry::strategy_intersection<boost::geometry::cartesian_tag,polygon,polygon,boost::geometry::model::d2::point_xy<double>,rescale_policy_type> 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/intersection/interface.hpp(302) : see reference to function template instantiation 'bool boost::geometry::resolve_variant::intersection<Geometry1,Geometry2>::apply<GeometryOut>(const Geometry1 &,const Geometry2 &,GeometryOut &)' being compiled 1> with 1> [ 1> Geometry1=polygon, 1> Geometry2=polygon, 1> GeometryOut=std::vector<polygon> 1> ] 1> .\main.cpp(24) : see reference to function template instantiation 'bool boost::geometry::intersection<polygon,polygon,std::vector<_Ty>>(const Geometry1 &,const Geometry2 &,GeometryOut &)' being compiled 1> with 1> [ 1> _Ty=polygon, 1> Geometry1=polygon, 1> Geometry2=polygon, 1> GeometryOut=std::vector<polygon> 1> ] 1>c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(97) : warning C4244: 'initializing' : conversion from 'const coordinate_type' to 'const promoted_type', possible loss of data 1>c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(98) : warning C4244: 'initializing' : conversion from 'const coordinate_type' to 'const promoted_type', possible loss of data 1>c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(99) : warning C4244: 'initializing' : conversion from 'const coordinate_type' to 'const promoted_type', possible loss of data 1>c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/recalculate.hpp(51) : warning C4244: 'argument' : conversion from '__int64' to 'const double', possible loss of data 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/recalculate.hpp(224) : see reference to function template instantiation 'void boost::geometry::detail::recalculate::recalculate_point<Dimension>::apply<Geometry1,Geometry2,Strategy>(Point1 &,const Point2 &,const Strategy &)' being compiled 1> with 1> [ 1> Dimension=2, 1> Geometry1=boost::geometry::model::d2::point_xy<double>, 1> Geometry2=boost::geometry::model::d2::point_xy<double>, 1> Strategy=rescale_policy_type, 1> Point1=boost::geometry::model::d2::point_xy<double>, 1> Point2=boost::geometry::model::d2::point_xy<double> 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/handle_tangencies.hpp(109) : see reference to function template instantiation 'void boost::geometry::recalculate<boost::geometry::model::d2::point_xy<CoordinateType>,boost::geometry::model::d2::point_xy<CoordinateType>,const RobustPolicy>(Geometry1 &,const Geometry2 &,const Strategy &)' being compiled 1> with 1> [ 1> CoordinateType=double, 1> RobustPolicy=rescale_policy_type, 1> Geometry1=boost::geometry::model::d2::point_xy<double>, 1> Geometry2=boost::geometry::model::d2::point_xy<double>, 1> Strategy=rescale_policy_type 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/handle_tangencies.hpp(96) : while compiling class template member function 'void boost::geometry::detail::overlay::sort_in_cluster<TurnPoints,Indexed,Geometry1,Geometry2,RobustPolicy,Reverse1,Reverse2,Strategy>::get_situation_map(const Indexed &,const Indexed &,boost::geometry::model::d2::point_xy<CoordinateType> &,boost::geometry::model::d2::point_xy<CoordinateType> &,boost::geometry::model::d2::point_xy<CoordinateType> &,boost::geometry::model::d2::point_xy<CoordinateType> &,boost::geometry::model::d2::point_xy<CoordinateType> &,boost::geometry::model::d2::point_xy<CoordinateType> &) const' 1> with 1> [ 1> TurnPoints=container_type, 1> Indexed=indexed_turn_operation, 1> Geometry1=polygon, 1> Geometry2=polygon, 1> RobustPolicy=const rescale_policy_type, 1> Reverse1=true, 1> Reverse2=true, 1> Strategy=boost::geometry::strategy::side::side_by_triangle<>, 1> CoordinateType=double 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/handle_tangencies.hpp(742) : see reference to class template instantiation 'boost::geometry::detail::overlay::sort_in_cluster<TurnPoints,Indexed,Geometry1,Geometry2,RobustPolicy,Reverse1,Reverse2,Strategy>' being compiled 1> with 1> [ 1> TurnPoints=container_type, 1> Indexed=indexed_turn_operation, 1> Geometry1=polygon, 1> Geometry2=polygon, 1> RobustPolicy=const rescale_policy_type, 1> Reverse1=true, 1> Reverse2=true, 1> Strategy=boost::geometry::strategy::side::side_by_triangle<> 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/enrich_intersection_points.hpp(290) : see reference to function template instantiation 'void boost::geometry::detail::overlay::handle_cluster<IndexType,true,true,nc_iterator,TurnPoints,Geometry1,Geometry2,const RobustPolicy,Strategy>(Iterator,Iterator,TurnPoints &,boost::geometry::detail::overlay::operation_type,const Geometry1 &,const Geometry2 &,RobustPolicy &,const Strategy &)' being compiled 1> with 1> [ 1> IndexType=indexed_turn_operation, 1> TurnPoints=container_type, 1> Geometry1=polygon, 1> Geometry2=polygon, 1> RobustPolicy=rescale_policy_type, 1> Strategy=boost::geometry::strategy::side::side_by_triangle<>, 1> Iterator=nc_iterator 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/enrich_intersection_points.hpp(533) : see reference to function template instantiation 'void boost::geometry::detail::overlay::enrich_sort<indexed_turn_operation,true,true,_Ty2,TurnPoints,Geometry1,Geometry2,RobustPolicy,Strategy>(Container &,TurnPoints &,boost::geometry::detail::overlay::operation_type,const Geometry1 &,const Geometry2 &,const RobustPolicy &,const Strategy &)' being compiled 1> with 1> [ 1> _Ty2=std::vector<indexed_turn_operation>, 1> TurnPoints=container_type, 1> Geometry1=polygon, 1> Geometry2=polygon, 1> RobustPolicy=rescale_policy_type, 1> Strategy=boost::geometry::strategy::side::side_by_triangle<>, 1> Container=std::vector<indexed_turn_operation> 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/overlay.hpp(215) : see reference to function template instantiation 'void boost::geometry::enrich_intersection_points<true,true,container_type,Geometry1,Geometry2,RobustPolicy,boost::geometry::strategy::side::side_by_triangle<>>(TurnPoints &,boost::geometry::detail::overlay::operation_type,const Geometry1 &,const Geometry2 &,const RobustPolicy &,const Strategy &)' being compiled 1> with 1> [ 1> Geometry1=polygon, 1> Geometry2=polygon, 1> RobustPolicy=rescale_policy_type, 1> TurnPoints=container_type, 1> Strategy=boost::geometry::strategy::side::side_by_triangle<> 1> ] 1>c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/recalculate.hpp(51) : warning C4244: 'argument' : conversion from '__int64' to 'const double', possible loss of data 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/recalculate.hpp(52) : see reference to function template instantiation 'void boost::geometry::detail::recalculate::recalculate_point<Dimension>::apply<Point1,Point2,Strategy>(Point1 &,const Point2 &,const Strategy &)' being compiled 1> with 1> [ 1> Dimension=1, 1> Point1=boost::geometry::model::d2::point_xy<double>, 1> Point2=boost::geometry::model::d2::point_xy<double>, 1> Strategy=rescale_policy_type 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/recalculate.hpp(224) : see reference to function template instantiation 'void boost::geometry::detail::recalculate::recalculate_point<Dimension>::apply<Geometry1,Geometry2,Strategy>(Point1 &,const Point2 &,const Strategy &)' being compiled 1> with 1> [ 1> Dimension=2, 1> Geometry1=boost::geometry::model::d2::point_xy<double>, 1> Geometry2=boost::geometry::model::d2::point_xy<double>, 1> Strategy=rescale_policy_type, 1> Point1=boost::geometry::model::d2::point_xy<double>, 1> Point2=boost::geometry::model::d2::point_xy<double> 1> ] 1>c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(88) : warning C4244: 'initializing' : conversion from '__int64' to 'const coordinate_type', possible loss of data 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(138) : see reference to function template instantiation 'PromotedType boost::geometry::strategy::side::side_by_triangle<CalculationType>::side_value<CoordinateType,PromotedType,P1,P2,P,EpsPolicy>(const P1 &,const P2 &,const P &,EpsPolicy &)' being compiled 1> with 1> [ 1> PromotedType=promoted_type, 1> CalculationType=coordinate_type, 1> CoordinateType=coordinate_type, 1> P1=robust_point_type, 1> P2=robust_point_type, 1> P=robust_point_type, 1> EpsPolicy=boost::geometry::strategy::side::side_by_triangle<coordinate_type>::eps_policy<boost::geometry::math::detail::equals_factor_policy<promoted_type>> 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(234) : see reference to function template instantiation 'PromotedType boost::geometry::strategy::side::side_by_triangle<CalculationType>::compute_side_value<CoordinateType,PromotedType,AreAllIntegralCoordinates>::apply<P1,P2,P,boost::geometry::strategy::side::side_by_triangle<CalculationType>::eps_policy<Policy>>(const P1 &,const P2 &,const P &,EpsPolicy &)' being compiled 1> with 1> [ 1> PromotedType=promoted_type, 1> CalculationType=coordinate_type, 1> CoordinateType=coordinate_type, 1> AreAllIntegralCoordinates=true, 1> P1=robust_point_type, 1> P2=robust_point_type, 1> P=robust_point_type, 1> Policy=boost::geometry::math::detail::equals_factor_policy<promoted_type>, 1> EpsPolicy=boost::geometry::strategy::side::side_by_triangle<coordinate_type>::eps_policy<boost::geometry::math::detail::equals_factor_policy<promoted_type>> 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/cart_intersect.hpp(140) : see reference to function template instantiation 'int boost::geometry::strategy::side::side_by_triangle<CalculationType>::apply<RobustPoint,RobustPoint,RobustPoint>(const P1 &,const P2 &,const P &)' being compiled 1> with 1> [ 1> CalculationType=coordinate_type, 1> RobustPoint=robust_point_type, 1> P1=robust_point_type, 1> P2=robust_point_type, 1> P=robust_point_type 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/cart_intersect.hpp(107) : see reference to function template instantiation 'boost::tuples::tuple<T0,T1> boost::geometry::strategy::intersection::relate_cartesian_segments<Policy,CalculationType>::apply<Segment1,Segment2,RobustPolicy,robust_point_type>(const Segment1 &,const Segment2 &,const RobustPolicy &,const RobustPoint &,const RobustPoint &,const RobustPoint &,const RobustPoint &)' being compiled 1> with 1> [ 1> T0=boost::geometry::segment_intersection_points<boost::geometry::model::d2::point_xy<double>,boost::geometry::segment_ratio_type<boost::geometry::model::d2::point_xy<double>,rescale_policy_type>::type>, 1> T1=boost::geometry::policies::relate::segments_direction::return_type, 1> Policy=boost::geometry::policies::relate::segments_tupled<boost::geometry::policies::relate::segments_intersection_points<boost::geometry::segment_intersection_points<boost::geometry::model::d2::point_xy<double>,boost::geometry::segment_ratio_type<boost::geometry::model::d2::point_xy<double>,rescale_policy_type>::type>>,boost::geometry::policies::relate::segments_direction>, 1> CalculationType=void, 1> Segment1=boost::geometry::model::referring_segment<const boost::geometry::model::d2::point_xy<double>>, 1> Segment2=boost::geometry::model::referring_segment<const boost::geometry::model::d2::point_xy<double>>, 1> RobustPolicy=rescale_policy_type, 1> RobustPoint=robust_point_type 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/get_turn_info_helpers.hpp(220) : see reference to function template instantiation 'boost::tuples::tuple<T0,T1> boost::geometry::strategy::intersection::relate_cartesian_segments<Policy,CalculationType>::apply<boost::geometry::model::referring_segment<ConstOrNonConstPoint>,boost::geometry::model::referring_segment<ConstOrNonConstPoint>,RobustPolicy>(const Segment1 &,const Segment2 &,const RobustPolicy &)' being compiled 1> with 1> [ 1> T0=boost::geometry::segment_intersection_points<boost::geometry::model::d2::point_xy<double>,boost::geometry::segment_ratio_type<boost::geometry::model::d2::point_xy<double>,rescale_policy_type>::type>, 1> T1=boost::geometry::policies::relate::segments_direction::return_type, 1> Policy=boost::geometry::policies::relate::segments_tupled<boost::geometry::policies::relate::segments_intersection_points<boost::geometry::segment_intersection_points<boost::geometry::model::d2::point_xy<double>,boost::geometry::segment_ratio_type<boost::geometry::model::d2::point_xy<double>,rescale_policy_type>::type>>,boost::geometry::policies::relate::segments_direction>, 1> CalculationType=void, 1> ConstOrNonConstPoint=const boost::geometry::model::d2::point_xy<double>, 1> RobustPolicy=rescale_policy_type, 1> Segment1=boost::geometry::model::referring_segment<const boost::geometry::model::d2::point_xy<double>>, 1> Segment2=boost::geometry::model::referring_segment<const boost::geometry::model::d2::point_xy<double>> 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/get_turn_info_helpers.hpp(214) : while compiling class template member function 'boost::geometry::detail::overlay::intersection_info<Point1,Point2,TurnPoint,RobustPolicy>::intersection_info(const Point1 &,const Point1 &,const Point1 &,const Point2 &,const Point2 &,const Point2 &,const RobustPolicy &)' 1> with 1> [ 1> Point1=boost::geometry::model::d2::point_xy<double>, 1> Point2=boost::geometry::model::d2::point_xy<double>, 1> TurnPoint=boost::geometry::model::d2::point_xy<double>, 1> RobustPolicy=rescale_policy_type 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/get_turn_info.hpp(926) : see reference to class template instantiation 'boost::geometry::detail::overlay::intersection_info<Point1,Point2,TurnPoint,RobustPolicy>' being compiled 1> with 1> [ 1> Point1=boost::geometry::model::d2::point_xy<double>, 1> Point2=boost::geometry::model::d2::point_xy<double>, 1> TurnPoint=boost::geometry::model::d2::point_xy<double>, 1> RobustPolicy=rescale_policy_type 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/get_turns.hpp(297) : see reference to function template instantiation 'OutputIterator boost::geometry::detail::overlay::get_turn_info<AssignPolicy>::apply<boost::geometry::model::d2::point_xy<CoordinateType>,boost::geometry::model::d2::point_xy<CoordinateType>,turn_info,RobustPolicy,std::back_insert_iterator<_Container>>(const Point1 &,const Point1 &,const Point1 &,const Point2 &,const Point2 &,const Point2 &,bool,bool,bool,bool,const TurnInfo &,const RobustPolicy &,OutputIterator)' being compiled 1> with 1> [ 1> OutputIterator=std::back_insert_iterator<container_type>, 1> AssignPolicy=boost::geometry::detail::overlay::assign_null_policy, 1> CoordinateType=double, 1> RobustPolicy=rescale_policy_type, 1> _Container=container_type, 1> Point1=boost::geometry::model::d2::point_xy<double>, 1> Point2=boost::geometry::model::d2::point_xy<double>, 1> TurnInfo=turn_info 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/get_turns.hpp(426) : see reference to function template instantiation 'bool boost::geometry::detail::get_turns::get_turns_in_sections<Geometry1,Geometry2,Reverse1,Reverse2,Section1,Section2,TurnPolicy>::apply<Turns,RobustPolicy,InterruptPolicy>(int,const Geometry1 &,const Section1 &,int,const Geometry2 &,const Section2 &,bool,const RobustPolicy &,Turns &,InterruptPolicy &)' being compiled 1> with 1> [ 1> Geometry1=polygon, 1> Geometry2=polygon, 1> Reverse1=true, 1> Reverse2=true, 1> Section1=boost::geometry::section<box_type,2>, 1> Section2=boost::geometry::section<box_type,2>, 1> TurnPolicy=TurnPolicy, 1> Turns=container_type, 1> RobustPolicy=rescale_policy_type, 1> InterruptPolicy=boost::geometry::detail::get_turns::no_interrupt_policy 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/partition.hpp(641) : see reference to function template instantiation 'bool boost::geometry::detail::get_turns::section_visitor<Geometry1,Geometry2,Reverse1,Reverse2,Turns,TurnPolicy,RobustPolicy,InterruptPolicy>::apply<boost::geometry::section<Box,DimensionCount>>(const Section &,const Section &)' being compiled 1> with 1> [ 1> Geometry1=polygon, 1> Geometry2=polygon, 1> Reverse1=true, 1> Reverse2=true, 1> Turns=container_type, 1> TurnPolicy=TurnPolicy, 1> RobustPolicy=rescale_policy_type, 1> InterruptPolicy=boost::geometry::detail::get_turns::no_interrupt_policy, 1> Box=box_type, 1> DimensionCount=2, 1> Section=boost::geometry::section<box_type,2> 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/get_turns.hpp(485) : see reference to function template instantiation 'void boost::geometry::partition<Box,ExpandPolicy1,OverlapsPolicy1>::apply<sections_type,sections_type,boost::geometry::detail::get_turns::section_visitor<Geometry1,Geometry2,Reverse1,Reverse2,Turns,TurnPolicy,RobustPolicy,InterruptPolicy>>(const InputCollection1 &,const InputCollection2 &,VisitPolicy &,size_t,VisitBoxPolicy)' being compiled 1> with 1> [ 1> Box=box_type, 1> ExpandPolicy1=boost::geometry::detail::section::get_section_box, 1> OverlapsPolicy1=boost::geometry::detail::section::overlaps_section_box, 1> Geometry1=polygon, 1> Geometry2=polygon, 1> Reverse1=true, 1> Reverse2=true, 1> Turns=container_type, 1> TurnPolicy=TurnPolicy, 1> RobustPolicy=rescale_policy_type, 1> InterruptPolicy=boost::geometry::detail::get_turns::no_interrupt_policy, 1> InputCollection1=sections_type, 1> InputCollection2=sections_type, 1> VisitPolicy=boost::geometry::detail::get_turns::section_visitor<polygon,polygon,true,true,container_type,TurnPolicy,rescale_policy_type,boost::geometry::detail::get_turns::no_interrupt_policy>, 1> VisitBoxPolicy=boost::geometry::detail::partition::visit_no_policy 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/get_turns.hpp(1002) : see reference to function template instantiation 'void boost::geometry::detail::get_turns::get_turns_generic<Geometry1,Geometry2,Reverse1,Reverse2,TurnPolicy>::apply<RobustPolicy,Turns,InterruptPolicy>(int,const Geometry1 &,int,const Geometry2 &,const RobustPolicy &,Turns &,InterruptPolicy &)' being compiled 1> with 1> [ 1> Geometry1=polygon, 1> Geometry2=polygon, 1> Reverse1=true, 1> Reverse2=true, 1> TurnPolicy=TurnPolicy, 1> RobustPolicy=rescale_policy_type, 1> Turns=container_type, 1> InterruptPolicy=boost::geometry::detail::get_turns::no_interrupt_policy 1> ] 1> c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/algorithms/detail/overlay/overlay.hpp(203) : see reference to function template instantiation 'void boost::geometry::get_turns<true,true,boost::geometry::detail::overlay::assign_null_policy,Geometry1,Geometry2,RobustPolicy,container_type,boost::geometry::detail::get_turns::no_interrupt_policy>(const Geometry1 &,const Geometry2 &,const RobustPolicy &,Turns &,InterruptPolicy &)' being compiled 1> with 1> [ 1> Geometry1=polygon, 1> Geometry2=polygon, 1> RobustPolicy=rescale_policy_type, 1> Turns=container_type, 1> InterruptPolicy=boost::geometry::detail::get_turns::no_interrupt_policy 1> ] 1>c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(89) : warning C4244: 'initializing' : conversion from '__int64' to 'const coordinate_type', possible loss of data 1>c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(91) : warning C4244: 'initializing' : conversion from '__int64' to 'const coordinate_type', possible loss of data 1>c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(92) : warning C4244: 'initializing' : conversion from '__int64' to 'const coordinate_type', possible loss of data 1>c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(93) : warning C4244: 'initializing' : conversion from '__int64' to 'const coordinate_type', possible loss of data 1>c:\releases\lib\boost\boost_1_58_0\include\boost/geometry/strategies/cartesian/side_by_triangle.hpp(94) : warning C4244: 'initializing' : conversion from '__int64' to 'const coordinate_type', possible loss of data 1>Build log was saved at "file://c:\cpp\boost_geom_warnings\Release\BuildLog.htm" 1>boost_geom_warnings - 0 error(s), 12 warning(s) ========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

2 2

Re: [Boost-users] boost::intrusive::slist push_back() => error: static assertion failed:
by Jonas Printzén 11 May '15

11 May '15

Mail-list failed to send me the reply from Ion, attempting a reply anyways... *(mail-list owner, what i do wrong?)* Thanx Ion. I got it to work as you suggested. Found old gtest - loggs that confirmed that the cache_last option wasn't needed in old code so this must be a change . Oh, and yes. uint64_t... :-) .. yes I modified the code after cut-paste. The docs for 1.55 intrusive slist under "Using base hooks <http://www.boost.org/doc/libs/1_55_0/doc/html/intrusive/usage.html#intrusiv…>" shows example with push_back() without mentioning cache_last. Mabey it should be push_front() in that example? Nifty to get to pick and choose level of overhead :-) /Jonas

2 1

[range] no matching function for call to make_begin_strided_iterator?
by Oliver Kowalke 11 May '15

11 May '15

Hi, if the test app below does not use adaptor strided in the for-range loop it works. If the adaptors is used the app fails with: ../../../../../boost/range/adaptor/strided.hpp: In instantiation of ‘boost::range_detail::strided_range<Rng, Category>::strided_range(Difference, Rng&) [with Difference = int; Rng = foo::X<int>; Category = boost::iterators::single_pass_traversal_tag]’: ../../../../../boost/range/adaptor/strided.hpp:656:54: required from ‘boost::range_detail::strided_range<Rng> boost::range_detail::operator|(Rng&, const boost::range_detail::strided_holder<Difference>&) [with Rng = foo::X<int>; Difference = int; typename boost::iterators::pure_iterator_traversal<typename boost::range_iterator<C>::type>::type = boost::iterators::single_pass_traversal_tag]’ fibonacci.cpp:188:50: required from here ../../../../../boost/range/adaptor/strided.hpp:631:34: error: no matching function for call to ‘make_begin_strided_iterator(foo::X<int>&, int&, boost::mpl::eval_if<boost::is_convertible<std::input_iterator_tag, boost::iterators::incrementable_traversal_tag>, boost::mpl::identity<std::input_iterator_tag>, boost::iterators::detail::old_category_to_traversal<std::input_iterator_tag> >::type)’ >::type()), Could you give me a hint what is missing? thx, Oliver #include <iostream> #include <iterator> #include <vector> #include <boost/range.hpp> #include <boost/range/adaptor/strided.hpp> namespace foo { template< typename T > class X { private: typedef std::vector< T > vec_t; vec_t vec_; public: X( vec_t const& vec) : vec_( vec) { } class iterator : public std::iterator< std::input_iterator_tag, T > { private: X * x_; typename vec_t::iterator i_; public: typedef typename iterator::pointer pointer_t; typedef typename iterator::reference reference_t; iterator() : x_( 0), i_() {} explicit iterator( X * x) : x_( x), i_( x_->vec_.begin() ) {} iterator( iterator const& other) : x_( other.x_), i_( other.i_) {} iterator & operator=( iterator const& other) { if ( this == & other) return * this; x_ = other.x_; i_ = other.i_; return * this; } bool operator==( iterator const& other) const { return other.x_ == x_ && other.i_ == i_; } bool operator!=( iterator const& other) const { return other.x_ != x_ || other.i_ != i_; } iterator & operator++() { ++i_; return * this; } iterator operator++( int) { i_++; return * this; } reference_t operator*() const { return * i_; } pointer_t operator->() const { return & ( * i_); } }; class const_iterator : public std::iterator< std::input_iterator_tag, const T > { private: X * x_; typename vec_t::const_iterator i_; public: typedef typename iterator::pointer pointer_t; typedef typename iterator::reference reference_t; const_iterator() : x_( 0), i_() {} explicit const_iterator( X * x) : x_( x), i_( x_->vec_.begin() ) {} const_iterator( const_iterator const& other) : x_( other.x_), i_( other.i_) {} const_iterator & operator=( const_iterator const& other) { if ( this == & other) return * this; x_ = other.x_; i_ = other.i_; return * this; } bool operator==( const_iterator const& other) const { return other.x_ == x_ && other.i_ == i_; } bool operator!=( const_iterator const& other) const { return other.x_ != x_ || other.i_ != i_; } const_iterator & operator++() { ++i_; return * this; } const_iterator operator++( int) { i_++; return * this; } reference_t operator*() const { return * i_; } pointer_t operator->() const { return & ( * i_); } }; friend class iterator; friend class const_iterator; }; template< typename T > typename X< T >::iterator range_begin( X< T > & c) { return typename X< T >::iterator( & c); } template< typename T > typename X< T >::const_iterator range_begin( X< T > const& c) { return typename X< T >::const_iterator( & c); } template< typename T > typename X< T >::iterator range_end( X< T > &) { return typename X< T >::iterator(); } template< typename T > typename X< T >::const_iterator range_end( X< T > const&) { return typename X< T >::const_iterator(); } template< typename T > typename X< T >::iterator begin( X< T > & c) { return boost::begin( c); } template< typename T > typename X< T >::const_iterator begin( X< T > const& c) { return boost::begin( c); } template< typename T > typename X< T >::iterator end( X< T > & c) { return boost::end( c); } template< typename T > typename X< T >::const_iterator end( X< T > const& c) { return boost::end( c); } } namespace boost { template< typename T > struct range_mutable_iterator< foo::X< T > > { typedef typename foo::X< T >::iterator type; }; template< typename T > struct range_const_iterator< foo::X< T > > { typedef typename foo::X< T >::const_iterator type; }; } int main() { std::vector< int > vec = { 1,2,3,4,5,6,7,8,9,10 }; auto x = foo::X< int >( vec); for (auto i : x | boost::adaptors::strided( 2) ) std::cout << i << " "; std::cout << '\n'; }

2 1

boost::intrusive::slist push_back() => error: static assertion failed: (cache_last)
by Jonas Printzén 09 May '15

09 May '15

Hi All! First post... Attempt switching to intrusive slist for efficiency, the following example is simply cut-paste from docs. Won't compile! g++ 4.9.1 complains as inlined in code below. #include <boost/intrusive/slist.hpp> using namespace boost::intrusive; struct point : slist_base_hook<> { int64_t x,y; }; using points = slist<point>; int main() { points plist; point p1,p2,p3; ACCEPT( 0U == plist.size() ); plist.push_back( p1 ); // => error: static assertion failed: (cache_last) ACCEPT( 1U == plist.size() ); } The code is from the docs of my version (1.55) and im pretty sure this or similar worked before. (1.54 i think) Please help, what am I missing?

2 1

Re: [Boost-users] lexical_cast between double and string slow in Visual Studio 2013
by David Roberts 07 May '15

07 May '15

> That issue is unknown. I'd really appreciate the investigation. I have done some more investigation, and there are two factors that only cause the slowness when they both occur together. > Try excluding the lexical_cast from test, I have a feeling that this is only MSVC related issue: > > #include <sstream> > #include <string> > > int main (int, char **) > { > for (double count = 0.0; count < 1000000.0; count += 1.41) > { > std::stringstream ss; > ss << count; > std::string result = std::move(ss.str()); > ss.str(std::string()); > > ss << result; > ss >> count; > } > > return 0; > } > Running your test program does not exhibit the problem. It runs in around 3 seconds on my machine when built with either Visual Studio 2010 or Visual Studio 2013. However, changing it very slightly to match more closely what lexical_cast does internally does recreate the problem: #include <sstream> #include <string> int main (int, char **) { for (double count = 0.0; count < 1000000.0; count += 1.41) { std::stringstream ss; ss.unsetf(std::ios::skipws); ss.precision(17); ss << count; std::string result = std::move(ss.str()); ss.str(std::string()); ss << result; ss >> count; } return 0; } The effect of setting the precision to 17 is that lots of 9s appear in the string representations. (The number 17 is what boost::detail::lcast_get_precision(double*) chooses.) Without the precision call the contents of the string called result start off like this: 0 1.41 2.82 4.23 5.64 7.05 8.46 9.87 11.28 12.69 With precision set to 17 they start off like this: 0 1.4099999999999999 2.8199999999999998 4.2299999999999995 5.6399999999999997 7.0499999999999998 8.4599999999999991 9.8699999999999992 11.279999999999999 12.69 This happens for both Visual Studio 2010 and Visual Studio 2013. Then the next difference is that Visual Studio 2013 spends a lot longer handling all the extra 9s. Changing the program so that the double is converted to a string using std::stringstream without a precision call and then back to double using lexical_cast takes about 3 seconds for both Visual Studio 2010 and Visual Studio 2013. It is the combination of having all the extra 9s to parse and using Visual Studio 2013 that makes the test using lexical_cast to go both ways slow. Both Visual Studio 2010 and Visual Studio 2013 do the conversion by calling std::num_get<char,std::istreambuf_iterator<char,std::char_traits<char> > >::do_get() which then calls a function called _Stodx() which is implemented in xstod.c. This function is very different for the two versions. In Visual Studio 2010 it's a relatively thin wrapper around the C function strtod(). In Visual Studio 2013 _Stodx() has got a completely new implementation that's generated by #including xxstod.h with some macros defined. The original C function strtod() is much faster than the new _Stodx() when there are lots of 9s at the end of the strings being parsed. This modification to the program: #include <sstream> #include <string> #include <stdlib.h> int main (int, char **) { for (double count = 0.0; count < 1000000.0; count += 1.41) { std::stringstream ss; ss.unsetf(std::ios::skipws); ss.precision(17); ss << count; std::string result = std::move(ss.str()); ss.str(std::string()); ss << result; char *endptr; count = strtod(ss.str().c_str(), &endptr); } return 0; } has a runtime of about 3 seconds even though it's got to cope with all the 9s. I guess only someone from Microsoft or Dinkumware could comment on why _Stodx() was reimplemented. But the other thing is that by setting precision to 17 lexical_cast is bloating the string representations of the doubles with lots of 9s in both Visual Studio 2010 and Visual Studio 2013. Setting precision to 15 instead prevents this, and makes the original test run faster even with Visual Studio 2013 (about 4 seconds rather than 10). Regards, David

5 4

[MultiIndex] getting the index from set::lower_bound() iterator (or a replacement/extension)
by U.Mutlu 07 May '15

07 May '15

Hi, I need a container like std::set which delivers also the index when using the member function lower_bound(). IMO std::set lacks this important functionality. I cannot use std::distance(myset.begin(), it), because that is very slow as it walks again all the items from the beginning. Can boost MultiIndex be used for this, or any other alternatives/workarounds? Here's a demonstration of what I need: struct TS { /*...*/ }; set<TS> myset; TS S(/*...*/); auto it = myset.lower_bound(S); if (it != myset.end()) { size_t ix = ...howto get the index, ie. the rank?... //... } -- Thx Uenal

3 2

boost container help
by Uthpal Urubail 07 May '15

07 May '15

Experts, I am looking for help on a container where I could group the objects having similar properties Ex: struct phyProp { unsigned int color; double height; double weight; std::string location; }; Can I use boost for grouping the objects having same property? [With tolerance?] Any help is highly appreciated. Regards, UJ

3 2

error: type/value mismatch at argument 1 in template parameter
by Lane 06 May '15

06 May '15

bounded_buffer is taken from the boost circular_buffer examples which wraps operations with lock acquisition and release (more type-safe). I've changed up the calls slightly for my app and the problem is, I am having difficulty compiling. I was hoping to make the calls like below w/o the need for a template function (as in the example) since I'm in the function where I'd like to make the calls. --- bounded_buffer<MyData> bb(200); Consumer<bounded_buffer> consumer(bb); Producer<bounded_buffer> producer(bb); boost::thread* c_thread = new boost::thread(consumer); boost::thread* p_thread = new boost::thread(producer); threads.add_thread(c_thread); threads.add_thread(p_thread); --- Here are the compile errors: error: type/value mismatch at argument 1 in template parameter list for 'template<class Buffer> class Consumer' error: expected a type, got 'bounded_buffer' The example code I'm using is, http://www.boost.org/doc/libs/1_55_0/libs/circular_buffer/example/circular_…

2 1

Can a mapped_file larger than 2GB be random seeked?
by Narcélio Filho 05 May '15

05 May '15

(I'm resending this because it seems that my other message got garbled.) I'm writting on random positions on a mapped file, but it seems that if I seek past 2GB, write something, then seek to a lower position, I got a segfault. Here is the code: #include <cassert> #include <iostream> #include <fstream> #include <boost/iostreams/stream.hpp> #include <boost/iostreams/device/mapped_file.hpp> using namespace std; using boost::iostreams::stream; using boost::iostreams::mapped_file; int main(int argc, char** argv) { const size_t GIGA = 1024l*1024l*1024l; const size_t FILESIZE = 2l * GIGA + 10000; ofstream block("file", ios::binary | ios::out); assert(block.good()); block.seekp(FILESIZE); block.write("", 1); block.close(); mapped_file mappedFile("file"); stream<mapped_file> file(mappedFile, ios::binary|ios::out); assert(mappedFile.is_open()); char buffer[10] = {0}; cout << 0 << endl; file.seekp(0); file.write(buffer, 1); cout << FILESIZE - 1 << endl; file.seekp(FILESIZE - 1); file.write(buffer, 1); cout << 1 * GIGA << endl; file.seekp(1 * GIGA); file.write(buffer, 1); return 0; } I'm compiling under Ubuntu 14.10 (amd64): $ g++ boost-mmap.cpp -lboost_iostreams $ ./a.out 0 2147493647 Segmentation fault (core dumped) Everything is 64-bits: $ file a.out a.out: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, BuildID[sha1]=d39e3dc0c99e666631747e496bf798b92e4d4c71, not stripped I have the same issue compiling with Visual Studio and running under Windows 8 (amd64). What I'm doing wrong? -- []s, Narcélio.

3 4

boost thread + container.
by Andreas Hehn 05 May '15

05 May '15

Hello boost-users readers, I stumbled across some funny behavior of the headers of boost::thread and boost::container/boost::move for C++O3. I am unsure if this is a known shortcoming of those libraries or if it is a bug. I didn't find anything on the topic in the documentation so far. The problem is dependent on the include order of the two files: * boost/container/vector.hpp * boost/thread/thread.hpp The following code causes several compilation errors (boost-1.58.0/git, g++-4.9.2) related to the move emulation of boost::thread: #include <boost/container/vector.hpp> #include <boost/thread/thread.hpp> int main() { boost::container::vector<boost::thread> v; v.resize(10); return 0; } It prints several error messages starting with boost/container/detail/copy_move_algo.hpp:285:112: error: no matching function for call to ‘move(boost::thread&)’. The following error messages are also boost::move releated "failed" enable_ifs and so on. If I switch the order of the includes everything compiles just fine. Is there a requirement on the order of the includes that I overlooked or is this a bug? Best, Andreas

1 0

How to stage one sub libary in C++ boost
by J Ronald 05 May '15

05 May '15

1. I have been built one sub library as below successfully: b2 locale toolset=msvc address-model=64 link=static threading=multi runtime-link=shared variant=release 2. Then, I tried to run: b2 stage Unexpectedly, it'll build other sub libraries, instead of copy the built sub sub library to the stage directory as the document says. Is there any automatic way to get the final built result in one directory?

1 0

Efficiently pass data from thread to main
by Lane 05 May '15

05 May '15

Using boost, I start a thread from the main process as such. MyWorkThread newThread; newThread = boost::thread(newThread); And in the worker thread class (MyWorkThread), I have a read function which reads from a USB device as much data as it can deliver. This function can be called several hundred times a second. MyThread::read() } //... while () { MyData data; if (hasMore(dev, &data)) // lots of data here // need to get it back to the main thread } } } I'm trying to figure out how to efficiently get this data back to the main process to be placed in a buffer since it can be called so often. - Would making a callback to the main process be the way to go? If so, any pointers how using boost? - Or should I just have a global data buffer and store it directly?

2 1

[serialization] std::shared_ptr with Boost >= 1.53
by Rüdiger Berlich 04 May '15

04 May '15

Hi there, I need to support various versions of Boost, but am in the process of porting our entire code base to C++11. This involves replacing those constructs of Boost that are now in the standard with their C++11-counterparts. A prime example is std::shared_ptr. However, most of our code needs to be serializable. I know that serialization of std::shared_ptr is possible with Boost 1.58. But 1.53 (the oldest version I need to support) cannot serialize std::shared_ptr . Is there any reason not to include the 1.58-Version of #include <boost/serialization/shared_ptr.hpp> instead of the older version, if I detect a Boost-version < 1.58 ? Thanks and Best Regards, Beet

4 12

[Multiprecision] Get mantissa of a float
by Leonardo Yvens 04 May '15

04 May '15

Hello, I'm new to the Multiprecision library, and am trying to extract the mantissa from a float. Using cpp_bin_float, it's easy to get the exponent, but how can I get the mantissa in a normalized form (1.xxxxxxxxxx)? I tried messing with the limbs, they contain large powers of two, but I couldn't interpret that. Thank you very much, Leo Y.

2 2

Can a mapped_file bigger than 2GB be random seeked?
by Narcélio Filho 04 May '15

04 May '15

Hello! I'm writting on random positions on a mapped file, but it seems that if I seek past 2GB, write something, then seek to a lower position, I got a segfault. Here is the code: #include <iostream> #include <fstream> #include <boost/iostreams/stream.hpp> #include <boost/iostreams/device/mapped_file.hpp> using namespace std; using boost::iostreams::stream; using boost::iostreams::mapped_file; int main(int argc, char** argv) { const size_t GIGA = 1024l*1024l*1024l; const size_t FILESIZE = 2l * GIGA + 10000; ofstream block("file", ios::binary | ios::out); assert(block.good()); block.seekp(FILESIZE); block.write("", 1); block.close(); mapped_file mappedFile("file"); stream<mapped_file> file(mappedFile, ios::binary | ios::out); assert(mappedFile.is_open()); char buffer[10] = {0}; cout << 0 << endl; file.seekp(0); file.write(buffer, 1); cout << FILESIZE - 1 << endl; file.seekp(FILESIZE - 1); file.write(buffer, 1); cout << 1 * GIGA << endl; file.seekp(1 * GIGA); file.write(buffer, 1); return 0; } I compile and run on Ubuntu 14.10/amd64: $ g++ example.cpp -lboost_iostreams 0 2147493647 Segmentation fault (core dumped) I also get the same error on Windows 8/amd64. What I'm doing wrong? []s, Narcélio.

1 0

[c++now] Perhaps of interest to Boost library users
by Niall Douglas 03 May '15

03 May '15

https://plus.google.com/+nialldouglas/posts/DsAdUV4RgY5 Content of post for convenience: Just finished my C++ Now 2015 presentation with exactly one week to go! Currently 90 slides for a 90 minute long presentation, I had originally been worried I'd be boring but I think, even if I do say so myself, that this will be one of the more interesting talks at C++ Now this year. It reviews *ten* C++ 11/14 only libraries close to entering Boost, three of which in detail (Boost.AFIO, Boost.Fiber, Boost.DI) and one in very great detail (Boost.APIBind), indeed I spend about 45 slides on APIBind as I believe it provides the foundation stone for a fully modular C++ 11 only Boost 2.0 branch with very significant improvements over Boost 1.0. I also draw some sweeping personal general opinions from the ten library review, and I'll try to answer these questions: * Why do these libraries require C++ 11 or 14? From an end user perspective. * Is there a common theme of the most popular C++ 11/14 features used? * Is there a common theme in choice of library design and use of third party libraries? * Are there techniques used in one library which would make a lot of sense to be used in another library, but for some reason are not? * Do these new libraries take notice of one another and integrate themselves well with other libraries, or are they ivory towers? * How many of these forthcoming libraries explicitly seek to contribute to future C++ standardization? Boost only a few years ago was in a state of sickly malaise after the exit of several big names who had dominated it since its inception. Indeed, in 2013 no new libraries had entered in two years, and nobody could say if Boost was going to be the venue for the next generation of C++ 11/14 libraries approaching standardisation or whether some other venue (especially WG21 itself) would take over. Since 2013 *seventeen* new libraries have either entered Boost or entered the formal review queue, almost a third of which are C++ 11/14 mandatory libraries, whilst WG21's efforts to invent new libraries have not panned out well to date. Traffic on the Boost mailing lists which had become anaemic has once again returned to mass-delete-without-reading levels. It looks like Boost is going to remain the place to be for the highest quality C++ libraries, especially those intended for eventual standardisation. The big question is whether the C++ 11/14 mandatory libraries are so different from the 98/03 libraries in design and philosophy that a C++ 11/14 only Boost 2.0 distribution is warranted? Robert Ramey will be presenting on his vision for Boost 2.0 at C++ Now 2015, and he kindly has allowed me to add my ha'pennies worth after he finishes during which I will summarise my empirical findings from the ten library review. So watch out for the recorded videos! -- ned Productions Limited Consulting http://www.nedproductions.biz/ http://ie.linkedin.com/in/nialldouglas/

2 2

[BGL] I think the invariant in ResourceExtensionFunction for r_c_shortest_paths is not correct
by Alberto Maria Santini 02 May '15

02 May '15

The documentation for 1.58.0 (http://www.boost.org/doc/libs/1_58_0/libs/graph/doc/r_c_shortest_paths.html) correctly states that: >>> The implementation is a label-setting algorithm. This means that there must be one or more resources whose cumulated consumption(s) after extension is/are always at least as high as before. This is similar to the Dijkstra algorithm for the SPP without resource constraints where the distance measure must be non-negative. It is sufficient if there is one resource with a non-negative resource consumption along all arcs (for example, non-negative arc lengths or non-negative arc traversal times). >>> But, later on, it says: >>> If ref models the ResourceExtensionFunction concept, and if the type Resource_Container models the ResourceContainer concept, after the call ref( const Graph& g, Resource_Container& new_cont, const Resource_Container& old_cont, graph_traits<Graph>::edge_descriptor ) the expression old_cont <= new_cont evaluates to true. This is because, as stated above, the implementation is a label-setting algorithm. Therefore, the Less-Than operator for ResourceContainer must compare one or more resource(s) whose resource consumption(s) along any arc is/are non-decreasing in order for the algorithm to work properly. >>> Now, saying that "old_cont <= new_cont" is much stricter than it should be. The correct requirement (first quote) is that there is **at least one** resource whose consumption monotonically doesn’t decrease. What "old_cont <= new_cont” requires, is that **all** resources’ consumptions are monotonically non-decreasing. These two things are equivalent iff the label only has one resource. Can someone confirm that my observation makes sense? In this case, I’ll open a ticket and submit a patch for the documentation. Can someone also confirm that this check is *not* enforced in r_c_shortest_paths.hpp? Thanks, AS

1 0

Official Stance on CMake Adoption
by Michael Ainsworth 02 May '15

02 May '15

What is the official stance on CMake adoption? Is if simply a fork in the development, or will all of Boost eventually be built using CMake? Michael

3 3

Re: [Boost-users] [boost] [ANN] "Die Boost C++ Bibliotheken", 2nd edition available (German edition)
by Rüdiger Berlich 01 May '15

01 May '15

Let me just say that the book is excellent! Thanks, Boris, for supplying such a comprehensive source of information on Boost. Best Regards, Ruediger > Am 01.05.2015 um 12:31 schrieb Boris Schäling <boris(a)highscore.de>: > > Just a quick announcement: The 2nd edition of my book "Die Boost C++ Bibliotheken" (German edition) is available. > > - It introduces 72 Boost libraries. > - It contains more than 430 examples. > - The print version has 600 pages. > - There is also a Kindle, Epub and PDF version. > - It's also online: <http://dieboostcppbibliotheken.de/> > > There is hardly any difference between the German and the English language edition. The German language edition is a bit more up-to-date after the English language edition has been published in September last year. But there is no need to read the book again in case you read the English language edition already. > > For those who don't know German: The English language edition remains available online at <http://theboostcpplibraries.com/>. > > Boris > > > _______________________________________________ > Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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Boost.Cgi Status
by Michael Ainsworth 01 May '15

01 May '15

What is the status of Boost.Cgi by Darren Garvey? It seems that the library hasn't been accepted and it's now 2015 - at least 7 years after last Boost Users mailing list post regarding its status. Michael

2 2

[gsoc15] This year's GSoC students
by Niall Douglas 27 Apr '15

27 Apr '15

Dear Boost, It is our pleasure to announce this year's winning GSoC students and projects: 1. Damian Vicino Topic: Safe Float (boost::safe_numerics<float>) Mentor: Robert Ramey 2. Rajaditya Mukherjee Topic: Boost uBLAS EigenSolver Mentor: David Bellot 3. Anurag Ghosh Topic: Boost Document Library Mentor: Antony Polukhin 4. Nikhar Agrawal Topic: Boost.Fixed-Point Mentor: Paul A. Bristow 5. Benedek Thaler Topic: Enhanced vector and deque containers Mentor: Thorsten Ottosen 6. Louis Dionne Topic: Improved compile-time associative data structures for Hana Mentor: Joel Falcou 7. Jakub Szuppe Topic: Improving Boost.Compute Mentor: Kyle Lutz Congratulations to these students for passing an exceptionally tough contest this year, and our thanks to the above mentors for making themselves available. Finally, thank you Google for another year of funding and to those open source orgs who released duplicate students to us, we appreciate it! Niall and Boris --- Boost C++ Libraries Google Summer of Code 2015 admin https://svn.boost.org/trac/boost/wiki/SoC2015

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Re: [Boost-users] boost examples
by Max 27 Apr '15

27 Apr '15

----- Original Message ----- From: mloskot <mateusz(a)loskot.net> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] boost examples Date: 2015-04-24 18:01 mloskot wrote > On 23 April 2015 at 11:44, Trek < > trek830@ > > wrote: >> Is there a central link where all official boost examples are hosted? > > No. You may check http://theboostcpplibraries.com/ for unofficial ones. ----- -- Mateusz Loskot, http://mateusz.loskot.net Charter Member of OSGeo, http://osgeo.org Member of ACCU, http://accu.org The book, Beyond the C++ Standard Library, also used to be a very good starting point of my understanding the boost libraries. Max

1 0

[Pyhton] (re)binding class instance in python object
by Tamas.Ruszkai＠leica-geosystems.com 27 Apr '15

27 Apr '15

Hi, I have a plain C++ class which I want to exposed to python. The pyhton object accesses the C++ class via smart pointer. class Sensor : public boost::enable_shared_from_this<Sensor> { public: Sensor(int port); ~Sensor() void Open(); void SendCommand(const std::string& command); void Close(); private: int _port; }; auto sensorClassTypeObject = boost::python::class_<Sensor, boost:: shared_ptr<Sensor>>("Sensor", boost::python::init<int>()) .def("Open", &Sensor::Open) .def("SendCommand", &Sensor::SendCommand) .def("Close", &Sensor::Close); The question is: if I already have one instance of the C++ class (in a dependency injection container) then how can I create in the C++ part an instance of the python wrapper so that it does not create a new instance of Sensor, but uses my existing Sensor instance? Then I would put this instance into one of the python modules (this part would be made in C++) inside the python interpreter to be able to access it via script. Something like that: shared_ptr<Sensor> sensorInstance = DIContainer.Resolve<Sensor>(); boost::object pythonInstance = sensorClassTypeObject(sensorInstance); pythonInterpreterWrapper.AddToModule("__main__", pythonInstance); Best Regards, Tamas

1 0

[msm] Event does not get processed after exiting an interrupt state
by Chrisopher Vogl 27 Apr '15

27 Apr '15

Hi all! I got a state machine with 2 regions. The second region has two states ("Run" and "Interrupt"), one is an interrupt state. The region starts in the non interrupt state, just like in the MSM example "Orthogonal regions, terminate state, event deferring". The event called Ev_Resume leads to a transition from state Interrupt back to state Run. In on_entry() of Run I fire an event which never gets processed. Is at that time the FSM still interrupted, i.e. event processing still blocked? Christopher

2 1

Re: [Boost-users] [boost] [test] boost.test owner unresponsive to persistent problems for multiple years
by Paul A. Bristow 24 Apr '15

24 Apr '15

> -----Original Message----- > From: Boost [mailto:boost-bounces@lists.boost.org] On Behalf Of Richard > Sent: 17 March 2015 17:20 > To: boost(a)lists.boost.org > Subject: Re: [boost] [test] boost.test owner unresponsive to persistent problems for multiple years > > Another quarter has gone by and another Boost release is prepared for beta and I see *no* changes to > Boost.Test listed in the release notes.> > So here we are, waiting another 3 months for *simple* changes to be reflected in this library while the > maintainer insists that the fixes are available, yet they continue not to be deployed into any shipping release. It is indeed really deplorable that we don't have Boost.Test updates in a release. Though in mitigation I note that we are really struggling to get out a GIT-driven release at all, (and some of the new troubles are with asynch-exceptions in Boost.Test. See this thread Re: [boost] Running b2 on develop needs asynch-exceptions=on.) However, Richard's hard work on improved docs have been refined and completed by Raffi Enficiaud. Many bug fixes are in the develop branch (including some very new and prompt bug fixes, for example https://svn.boost.org/trac/boost/ticket/11054) I also understand that the fear of Boost.Test updates causing trouble with other libraries, and worse with users test, is a cause for caution in a release version. So it would be really good if *lots more users could download and use the version in the Boost.Test develop branch* so we can get current user feedback. (My experience is good using this, and the test matrix is also good). You can download just Boost.Test either using GIT or as a zip from https://github.com/boostorg/test/tree/develop and substitute it for the contents of the current release modular-boost/libs/test folder (Don't forget to rebuild the Boost.Test library unless you only use the included version). If nothing else, you will find Raffi's shiny new Boostbook docs finally allow you to find what you want to know without frustration. I'd very much like to see this new docs version in the 1.58 documentation release (despite any new features not being in the code release). Paul --- Paul A. Bristow Prizet Farmhouse Kendal UK LA8 8AB +44 (0) 1539 561830

5 5

[log] Possible to explicitly disable AVX2?
by Jason Roehm 24 Apr '15

24 Apr '15

I am building Boost.Log on a relatively new machine whose compiler and CPU both support the AVX2 instruction set. Boost.Log detects this at build time and configures its compiler flags accordingly to use the AVX2 instruction set. I'd like to use the resulting binaries, however, on older systems that do not have AVX2 support. Is it possible to explicitly disable this at build time? I didn't see any mention of it in the documentation, and my attempts to parse the Jamfile's intentions were not successful. Thank you. Jason

1 0

[nowide] Cannot end input using ^Z/^D on Windows
by Yuan Yao 24 Apr '15

24 Apr '15

3 2

boost examples
by Trek 24 Apr '15

24 Apr '15

Is there a central link where all official boost examples are hosted? thanks,

3 2

Boost.Thread Continuation future with executor blocking in destructor
by Konrad Zemek 23 Apr '15

23 Apr '15

Hi, When creating a continuation future with future<>::then(), and the policy is boost::launch::async, the created future's destructor blocks, like a future created by boost::async, and probably for the same reasons (as outlined by the standardization committee in n3679). The same behavior is coded into continuation futures' destructor when using an executor. Why is it needed here? The situation with executor-run continuations is a little different, as even when the future is destroyed, the lifetime of running job is still bound to the executor. My use case: I've coded a network communication stack that returns to the caller a future<NetworkResponse>. I've previously used std::async(std::launch::deferred, ...) to transform the future's content before returning it to the caller (bytes -> protobuf -> internal object), and I consider such manipulation of a future value to be a very powerful feature. I've used std::launch::deferred to reduce the number of running threads, but the downside is that the client can't wait for the future value with a timeout. On the other side of the spectrum is std::launch::async, which would run a new thread - per pending communication - that would do little more than block. boost::future<>::then is a fantastic fit for my use case, as I can use my boost::asio::io_service as an executor and let my communication stack's threads do the work without having them block on future.get() to first retrieve the result. The caller can then call future<>::wait_for() to wait for the reply with a custom timeout. This being network communication, though, a reply message may never arrive - the corresponding promise will eventually be destroyed by the stack, but I can't have users block on the future's destructor until that happens, after they have already decided that the reply is no longer worth waiting for. Please advise if there's a workaround for this behavior that doesn't involve me distributing a custom version of Boost.Thread with my binaries? :) Konrad

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[asio] What are the enhancements for Asio in 1.58
by Aaron Levy 22 Apr '15

22 Apr '15

I am sorry if this has been already asked. Wanted to get a head start on Asio 1.58, having heard that it's a significantly enhanced library. -- Aaron Levy aaron.levy(a)yandex.com

3 2

[multi_index] Announcing preview of ranked indices
by Joaquin M Lopez Munoz 22 Apr '15

22 Apr '15

Hi, It's been 11 years since first proposed, but here it is at last. I'm releasing a prereview of ranked indices for Boost.MultiIndex: struct person { int age; std::string name; }; typedef multi_index_container< person, indexed_by< ranked_non_unique<member<person,int,&person::age> >, ordered_non_unique<member<person,std::string,&person::name>>>> multi_t; multi_t m={{40,"Joe"},{25,"Jill"},{30,"Kurt"},{32,"Sue"}}; auto it=m.emplace(31,"Maggie").first; std::cout<<m.rank(it)<<" persons younger than "<<it->name<<"\n"; auto n=m.size()/2; std::cout<<n<<" persons are less than "<<m.nth(n)->age<<" years old\n"; Ranked indices add a bunch of extra rank-related capabilities to the interface of ordered indices. The rank of an element is its numerical position in the index. nth(i) returns an iterator to the element with rank i, whereas rank(it) is the inverse operation. Both execute in log(n) time. Additionally, the member functions find_rank lower_bound_rank upper_bound_rank equal_range_rank range_rank behave as their "_rank"-less counterparts except they return ranks rather than iterators. One drawback of ranked indices wrt ordered indices (other than their slower perfomance and higher memory consumption) is that deletion of elements is log(n) (in ordered indices it is constant time). Download lib preview: http://tinyurl.com/kemwk8q Tutorial: http://tinyurl.com/q36c9f7 Reference: http://tinyurl.com/pvoulgr For people interested in this, I'd appreciate if you could download the source, copy it on top of Boost 1.58 (1.57 should work as well), play a bit with the new feature and report your results. Also, opinions on naming are welcome. Target version for releasing is Boost 1.59, so we have plenty of time to discuss the design before it is final. Thank you, Joaquín M López Muñoz Telefónica

1 0

Which is the effective way for data transfer for Interprocess shared memory ?
by Kalyan Chakravarthy Gudimella 22 Apr '15

22 Apr '15

Hi, I am currently evaluating boost interprocess library for using shared memory. I found two ways to transfer complex data structures. 1. Creating data structures directly in shared memory. E.g. http://www.boost.org/doc/libs/1_58_0/doc/html/interprocess/allocators_conta… class complex_data{ int id_; char_string char_string_; int_vector_vector int_vector_vector_; public: //Since void_allocator is convertible to any other allocator<T>, we can simplify //the initialization taking just one allocator for all inner containers. complex_data(int id, const char *name, const void_allocator &void_alloc) : id_(id), char_string_(name, void_alloc), int_vector_vector_(void_alloc) {} //Other members...}; 2. Serializing data into bufferstream and deserializing it. E.g.http://www.boost.org/doc/libs/1_58_0/doc/html/interprocess/streams.html My initial trial shows that streaming to bufferstream took 7 times more time than using direct shared structures. Can you please help me to choose the effective way between these two approaches? thanks, Kalyan

1 0

[MPL][Config] Can no longer pre-generate headers for MPL-containers with more than 50 elements.
by Deniz Bahadir 22 Apr '15

22 Apr '15

Hello everyone, While playing around with the current Boost release-candidate (1.58.0-RC3) I noticed that pre-generating MPL-headers for MPL-containers with more than 50 Elements seems no longer possible. Up till at least Boost 1.55.0 I was able to pre-generate these MPL-headers using the python-scripts from Boost-source ([1]) with the help of a bash-script which I already described here [2]. Internally, these python-scripts seem to use GCC to generate these MPL-headers. They also seem to partially circumvent Boost.Config by using custom user.hpp files located in subdirectories of [3] and defining BOOST_NO_CONFIG and some other macros therein. However, this does not seem to please Boost.Config so that compiler-errors ([4]) occur. Defining the macro BOOST_CONFIG_ALLOW_DEPRECATED as [4] suggests seems not to help. It just silences the warnings but does not generate proper files. (It actually erases the content of almost all header-files in subdirectories of [5].) Does anyone know how to workaround or better fix this? Or does anyone know who to talk to, to get these problems fixed? Also, I would suggest, that documentation for these python-scripts are added to the documentation of Boost.MPL. Best regards, Deniz References: [1] ${BOOST_SOURCE}/libs/mpl/preprocessed/ [2] http://stackoverflow.com/a/20660264/3115457 [3] ${BOOST_SOURCE}/libs/mpl/preprocessed/include/ [4] #error "You are using a compiler which lacks features which are now a minimum requirement in order to use Boost, define BOOST_CONFIG_ALLOW_DEPRECATED if you want to continue at your own risk!!!" [5] ${BOOST_SOURCE}/boost/mpl/aux_/preprocessed/

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[SPAM] from: giridhar
by giridhar 22 Apr '15

22 Apr '15

Greetings boost http://findislamicservices.com/reduce.php?silver=aswydt7xv2r0enm3 giridhar Sent from my iPhone

1 0

sliding window containing n seconds of data
by Lane 22 Apr '15

22 Apr '15

I'm looking for a way to examine an array of object structures for an adjustable window of n seconds. My application reads objects at a high rate (which I'll have to throttle), and I'd then like to put them onto an array. My thinking is to assign a timer on each object that is initialized to n seconds and once the timer expires, the object is removed from the array, but while it's on the array, I'll iterate over the objects looking for the info I need. I put this out on the boost list as I suspect boost has the mechanisms to handle this and someone could suggest a good way of going about it. Any help much appreciated.

5 5

1.58.0 rc3 is now available
by Marshall Clow 22 Apr '15

22 Apr '15

Release candidate files for 1.58.0 are available at: http://boost.cowic.de/rc/ * Since rc1, the changes that were causing the serialization libraries to fail to build on MSVC have been reverted. * Since rc2, the documentation for bind, and mem_fun. No code changes. As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. This helps ensure the candidates build OK before we push them out to SourceForge. The files (and associated md5s) are: MD5 (boost_1_58_0_rc3.7z) = f7255aeb692c1c38fe761c32fb0d3ecd MD5 (boost_1_58_0_rc3.tar.bz2) = b8839650e61e9c1c0a89f371dd475546 MD5 (boost_1_58_0_rc3.tar.gz) = 5a5d5614d9a07672e1ab2a250b5defc5 MD5 (boost_1_58_0_rc3.zip) = b0605a9323f1e960f7434dbbd95a7a5c Thanks! -- The release managers P.S. Release notes are here: http://www.boost.org/users/history/version_1_58_0.html

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Re: [Boost-users] [IPC Named Mutex]
by Lorenzo Trivelli 21 Apr '15

21 Apr '15

Hi Tom, I tried your solution and it worked, and I'm stil wondering about the rationale behind the bootup time usage ;-) I also submitted a bug ticket, #11194, but track took a very long time to create it and add the test case, and in the end I found that: 1) a bug with ticket !11195 was also created 2) the test case was attached four times :-( can anyone please clean it up as is is a quite ugly ? ;-) regards Lorenzo

1 0

Re: [Boost-users] [Serialization / 1.58] wrong number of entries in std::vector<boost::tuple<double, double, double> >
by Rüdiger Berlich 21 Apr '15

21 Apr '15

Hi Robert, I have submitted trac item 11214 and attached the test case. The trac web interface somehow froze for me upon submission (Safari / MacOS), and I apparently have pressed the submit button more than once, trying to submit the track item. So it appears as if more than one ticket has been created (11215 - 11218), which I do not seem to be able to delete. Please ignore these -- apologies. Best Regards, Beet > > ouch! - make a trac item for this! > > Robert Ramey > > > > -- > View this message in context: http://boost.2283326.n4.nabble.com/Serialization-1-58-wrong-number-of-entri… > Sent from the Boost - Users mailing list archive at Nabble.com. > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

1 0

Web doc 1.58 Categorized error
by Larry 20 Apr '15

20 Apr '15

I tried to look at the 1.58 doc on the website and clicking on Categorized gave me under the headings By Category Unknown category: Data structures Apparently missing something. “All”, “Standard Proposals” etc seem to work. Larry

2 1

[Serialization / 1.58] wrong number of entries in std::vector<boost::tuple<double, double, double> >
by Rüdiger Berlich 20 Apr '15

20 Apr '15

Hi, I’ve just installed Boost 1.58 and ran into the following problem: I have a class with a std::vector<boost::tuple<double, double, double> >, that is supposed to always have at least one entry, but may have more. Hence, in the default constructor, I initialize the std::vector with one entry. The class is also serializable. Up until Boost 1.57, a de-serialized object always had the correct number of entries in the vector. As of 1.58, I am getting one entry too much, which probably means that Boost.Serialization simply attaches entries to the vector of a default-constructed class, but doesn’t clear it first. This happens in C++11-Mode, both on Ubuntu 14.10 (gcc 4.9.1) as well as on MacOS X Yosemite . It DOES NOT happen with a std::vector<double> . Below is a full test case that replicates the problem in a simplified environment. For Boost 1.57 the program returns: t_vec.size() = 1 t_vec2.size() = 1 For Boost 1.58 the answer is t_vec.size() = 1 t_vec2.size() = 2 Best Regards, Beet /******************************************************/ #include <boost/archive/xml_oarchive.hpp> #include <boost/archive/xml_iarchive.hpp> #include <boost/serialization/nvp.hpp> #include <boost/serialization/vector.hpp> #include <boost/tuple/tuple.hpp> #include <iostream> #include <vector> #include <sstream> namespace boost { namespace serialization { template<typename archive, typename T0, typename T1, typename T2> void serialize(archive & ar, boost::tuple<T0, T1, T2> & tpl, unsigned int) { using namespace boost; using boost::serialization::make_nvp; ar & make_nvp("tpl_0", boost::get<0>(tpl)) & make_nvp("tpl_1", boost::get<1>(tpl)) & make_nvp("tpl_2", boost::get<2>(tpl)); } } /* namespace serialization */ } /* namespace boost */ int main() { std::vector<boost::tuple<double, double, double> > t_vec, t_vec2(1); std::ostringstream oss; t_vec.push_back(boost::tuple<double, double, double>(1.,2.,3.)); std::cout << "t_vec.size() = " << t_vec.size() << std::endl; // save data to archive { boost::archive::xml_oarchive oa(oss); // write class instance to archive oa & BOOST_SERIALIZATION_NVP(t_vec); // archive and stream closed when destructors are called // Data is now in oss } // load data from archive { std::istringstream iss(oss.str()); boost::archive::xml_iarchive ia(iss); // read class state from archive ia & BOOST_SERIALIZATION_NVP(t_vec2); // archive and stream closed when destructors are called } std::cout << "t_vec2.size() = " << t_vec2.size() << std::endl; }

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Compile errors in pointer_traits.hpp after upgrade to 1_58_0
by James Walker 20 Apr '15

20 Apr '15

After switching from Boost 1_57_0 to 1_58_0, I get various compile errors in pointer_traits.hpp, where it uses the macro BOOST_INTRUSIVE_HAS_STATIC_MEMBER_FUNC_SIGNATURE: warning: declaration does not declare anything error: use of undeclared identifier 'check' error: 'U' does not refer to a value This is with Xcode 4.6.3 and the Apple LLVM 4.2 compiler.

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Boost Spirit Karma - convert character to hex representation
by Ernest Zaslavsky 20 Apr '15

20 Apr '15

There is karma::hex formatter and I need somehow to add zero padding to get “0a” instead of just “a”. in addition it would be lovely to have some king of control over hex letter case. It sounds like a policies for real or Boolean formatters but I didn’t find one for hex. Is it possible to achieve the above without policy? [Read More]<http://feeds.feedburner.com/~r/sizmek-blog/~6/1> [http://www.sizmek.com/Sizmek.png]<http://www.sizmek.com/>

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Re: [Boost-users] Boost 1.58.0 has been released
by Florent Guiliani 20 Apr '15

20 Apr '15

On 4/18/15 6:00 PM, boost-users-request(a)lists.boost.org wrote: > On Fri, Apr 17, 2015 at 8:59 PM, Tom Kent<lists(a)teeks99.com> wrote: >> > >> >On Fri, Apr 17, 2015 at 3:58 PM, Marshall Clow<mclow.lists(a)gmail.com> >> >wrote: >>> >> >>> >>Release 1.58.0 of the Boost C++ Libraries is now available. > You sure about that? > Did you forget to push the release tag on Github? https://github.com/boostorg/boost/releases The release tag boost-1.58.0 is missing on Github. -- Florent

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Compile error with boost::factory after upgrade to 1.58.0
by Bitar Fadi 18 Apr '15

18 Apr '15

Hi, I installed Boost 1.58.0 today, having been using 1.57.0 previously, and noticed that a part of my code that uses boost::factory doesn't compile anymore. Here's briefly what I'm doing, followed by the error message I'm getting: typedef boost::function<Apollo::ReportGenerator*(Apollo::ApolloBaseModel*)> reportFactory; struct reportListing { std::string displayName; reportFactory factory; reportListing(std::string name, reportFactory f) : displayName(name), factory(f) { } }; std::vector<reportListing> reportFactories; reportFactories.push_back(reportListing("Scenario Analyzer", boost::factory<Apollo::ScenarioAnalyzer*>())); // Apollo::ReportGenerator being the base class from which Apollo::ScenarioAnalyzer is derived ... The constructor for ScenarioAnalyzer is: ScenarioAnalyzer(Apollo::ApolloBaseModel* model) This fails to compile with the following error (on Windows 7 using Visual C++ 12): error C2664: 'Apollo::ScenarioAnalyzer *boost::factory<Pointer,void,factory_alloc_for_pointee_and_deleter>::operator ()(void) const' : cannot convert argument 1 from 'Apollo::ApolloBaseModel *' to 'Apollo::ApolloBaseModel *&' I'm just wondering if that is caused by an intentional change or not, because according to the change log to boost::factory no significant changes with implications to backward compatibility have been made. Also, I'm not sure I know how to get rid of this error. Thanks for the help! /Fadi ________________________________ Fadi Bitar Modeling and simulation specialist Energy Markets Telephone direct +46 (0)8 695 64 05 Mobile +46 725 40 64 05 fadi.bitar(a)sweco.se<mailto:fadi.bitar@sweco.se> Sweco Energuide AB Gjörwellsgatan 22 P.O. Box 34044 SE-100 26 Stockholm Telephone +46 8 695 60 00 www.sweco.se<http://www.sweco.se/> [cid:image001.jpg@01CECF3E.855DC4C0] Please consider the environment before printing this e-mail.

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Boost 1.58.0 has been released
by Marshall Clow 18 Apr '15

18 Apr '15

Release 1.58.0 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 two new libraries and numerous enhancements and bug fixes for existing libraries. New Libraries * Endian: Types and conversion functions for correct byte ordering and more regardless of processor endianness. * Sort: Includes spreadsort, a general-case hybrid radix sort that is faster than O(n*log(n)) For details, including download links, see http://www.boost.org/users/news/version_1.58.0 You can also download directly from SourceForge: http://sourceforge.net/projects/boost/files/boost/1.58.0/ 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 Vladimir Prus Rene Rivera Marshall Clow Eric Niebler Daniel James Beman Dawes

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How to suppress warnings from boost headers
by avib369 . 17 Apr '15

17 Apr '15

Is there any way using boost to suppress warning messages issued from the boost headers ? Is there a way to replace -I with -isystem ? Ta, Avi

1 0

multiprecision -- eigen matrices using dynamically allocated variable-precision mpfr_float
by Daniel Brake 17 Apr '15

17 Apr '15

I'd like to use the variable-precision mpfr_float type offered by the Boost.Multiprecision library, with the templated Eigen linear algebra library. I observe that if I make an identity matrix created with dynamically-allocated variable-precision mpfr_floats, and multiply it against itself, every other row is populated with nan's. Here is some code: int main(){ int size = 9; typedef boost::multiprecision::mpfr_float_backend<0, boost::multiprecision::allocate_dynamic> mybackend; typedef boost::multiprecision::number<mybackend, boost::multiprecision::et_on> mynumtype; typedef Eigen::Matrix<mynumtype, Eigen::Dynamic, Eigen::Dynamic> mp_matrix; mp_matrix A = mp_matrix::Identity(size, size); mp_matrix B = A*A; std::cout << B << std::endl; return 0; } output: 1 0 0 0 0 0 0 0 0 nan nan nan nan nan nan nan nan nan 0 0 1 0 0 0 0 0 0 nan nan nan nan nan nan nan nan nan 0 0 0 0 1 0 0 0 0 nan nan nan nan nan nan nan nan nan 0 0 0 0 0 0 1 0 0 nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan I have been able to pin it down to the allocate_dynamic switch; if I select allocate_stack, the product computes correctly; allocate_dynamic reliably generates nans. Fixed-precision numbers work just fine, and expression templates on/off make no difference. I'd like to use the dynamic allocation, as I expect to use thousands of digits at times. I am using clang++, with c++11, on OSX, Boost 1.57.0, Eigen 3.2.4. Same behaviour in 1.56 / 3.2.3. It seems like maybe an offset issue, but I just can't get there by myself. I've also played with defining the NumTraits in Eigen various ways, but nothing affects the nan behaviour. Does anyone have any ideas? Daniel Brake Postdoctoral Research Scholar University of Notre Dame

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[boost][thread] thread_local vs boost::thread_specific vs ::pthread_key_t
by chilabot＠gmail.com 16 Apr '15

16 Apr '15

I have a program that dlopens some libraries (all C++), that use TLS for a variable (which passed to all libraries). With the keyword 'thread_local' and with 'boost::thread_specific', the storage of the variable is different for every thread AND for every shared library. With 'pthread_key_t' it's only different for every thread, it behaves as expected. I guess 'boost::thread_specific' uses 'thread_local' and that's why it behaves like it. Why does 'thread_local' behave like this? $ clang --version Ubuntu clang version 3.5.0-4ubuntu2~trusty2 (tags/RELEASE_350/final) (based on LLVM 3.5.0) Target: x86_64-pc-linux-gnu Thread model: posix $ uname -a Linux robert-y510p 3.13.0-49-generic #81-Ubuntu SMP Tue Mar 24 19:29:48 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux ref http://stackoverflow.com/questions/29656089/ thread-local-vs-boostthread-specific-vs-pthread-key-t

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[IPC Named Mutex]
by Lorenzo Trivelli 16 Apr '15

16 Apr '15

Hi to everyone, I'm experiencing a strange behaviour of named mutex on a windows 2008 machine. symptoms: when the system event log is empty, creation of named mutex fails with a boost::interprocess::interprocess:exception with msg boost::interprocess_exception::library_error. Now some data: 1) Boost 1.57.0 + stlport 5.2 2) VS 2005 3) Target Environment: Win 2008/32 3) after a night of code digging I managed to crete a small sample which raises the exception: #include <boost/shared_ptr.hpp> #include <boost/interprocess/sync/named_mutex.hpp> #include <boost/interprocess/sync/scoped_lock.hpp> #include <iostream> typedef boost::shared_ptr<boost::interprocess::named_mutex> safe_ipc_mx; static safe_ipc_mx __mx; int main(void) { system("pause"); try { __mx = safe_ipc_mx(new boost::interprocess::named_mutex(boost::interprocess::open_or_create_t(),"JAEGER")); std::cout << std::endl << "Mutex created !" << std::endl; } catch(boost::interprocess::interprocess_exception const& e) { std::cout << std::endl << "Mutex creation error " << e.what() << " /" << e.get_error_code() << " /" << e.get_native_error(); } system("pause"); return 0; } as far as I digged, it seems that the trouble is in the winapi::get_last_bootup_time(stamp) call in shared_dir_helpers.hpp, but up to now I had not been able to reproduce it on a machine with all the debugging tools installed does anyone have a clue on what I am doing wrong ? thanks in advance Lorenzo

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Re: [Boost-users] Project linking problem with boost
by Max 16 Apr '15

16 Apr '15

----- Original Message ----- From: <Mark.Bartosik(a)thomsonreuters.com> To: <boost-users(a)lists.boost.org> Subject: Re: [Boost-users] Project linking problem with boost Date: 2015-04-15 22:59 Try one of the /VERBOSE options on the linker’s command line will get you this information, I cannot remember which is the most painless one though. From the command line: /VERBOSE[:{CLR|ICF|INCR|LIB|REF|SAFESEH|UNUSEDLIBS}] /VERBOSE:LIB You can find this under Properties, Linker, General, Show Progress You can also set directly Properties, Linker, Command Line As I recall just /VERBOSE:LIB should generate a lot of output about which library is pulled in (and hopefully by which other library). Just the /VERBOSE output generate a huge amount of output (minimize the window and open with text editor later or it will be a long wait). - Mark - ------------------------------------------------------ Dear Mark, Thank you very much for your information - I didn't know this technique before. The problem is, though the problem seemed to be related to the linking process, the message as in my previous email was emitted by VS2008 before the linking process begins. So for the time being, I cannot benefit from adding extra switches to the link command. Best regards,Max --------------------------------------------------- From: Boost-users [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Max Sent: Wednesday, April 15, 2015 5:49 AM To: boost-users Subject: [Boost-users] Project linking problem with boost Sent: Wednesday, April 15, 2015 5:49 AM To: boost-users Subject: [Boost-users] Project linking problem with boost Hello, The problem here relates to boost, but I'm aware it may of more general nature rather than boost specific. I had a weird problem with my project. It has a bunch of dependencies including many of the boost libraries. My platform is: Win7SP1 + VS2008SP1 + boost1.39.0. I have properly set the VC++ directories for both include and lib files pointing to the boost folder (1.39.0) and of course those for other dependencies. But I got the following message when I built the project: 1>Linking to GSL lib 1>Linking to lib file: CGAL-vc90-mt.lib 1>Linking to lib file: libboost_date_time-vc80-mt-1_34.lib 1>Linking to lib file: libboost_regex-vc80-mt-1_34.lib I don't know why VS was attempting to link to libs of boost 1.34.0 built with VC80 (I'm using VC 90 - VS2008) Could anybody please give me some hints about this problem or where the message like "Linking to lib file: ..." came from? Thanks. Best regards, Max _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Re: [Boost-users] Project linking problem with boost
by Max 16 Apr '15

16 Apr '15

----- Original Message ----- From: Lorenzo Trivelli <trivelli.lorenzo(a)konvergence.it> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Project linking problem with boost Date: 2015-04-15 22:32 Sorry, it may sound a dumb question but are you sure that there are no 1.34 includes before the 1.39 or that there is no hardcoded 1.34 include in your code ? regards Lorenzo Dear Lorenzo, Thank you for your hints and sorry for not giving more details.I don't have the 1.34.0 version of boost on my machine and I have no hardcoded dependencies on it in my code. Best regards,Max

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[Build Boost] Failed gcc.archive
by Jan Krämer 16 Apr '15

16 Apr '15

Hi all, I am trying to build boost_1_57 on Windows7 with MinGW64 (tried gcc 4.9 and 4.9.2). Compiling works fine but gcc.archive fails with: gcc.archive bin.v2\libs\atomic\build\gcc\debug\address-model-64\link-static\threading-multi\libboost_atomic-gcc-mt-d-1_57.a '"C:\mingw-w64\mingw64\bin"' is not recognized as an internal or external command, operable program or batch file. '"C:\mingw-w64\mingw64\bin"' is not recognized as an internal or external command, operable program or batch file. It does that on every gcc.archive operation. I read that this can be caused when using a path with spaces inside, which is not the case here. I did not found any other information and I am stuck right now. Full console output can be found at: http://pastebin.com/bWP0WHAA used commands were: > bootstrap.bat mingw > b2 --prefix=C:/Boost toolset=gcc address-model=64 install --debug-configuration >> boost.log Thanks in advance, any help would be appreciated. Cheers, Jan

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Re: [Boost-users] boost vs std atomic sequential consistency semantics
by Isaac To 16 Apr '15

16 Apr '15

On Wed, Apr 15, 2015 at 4:34 PM, Olivier Tristan <o.tristan(a)uvi.net> wrote: Have you tried Boost LockFree ? > http://www.boost.org/doc/libs/1_55_0/doc/html/lockfree.html > which handle multiple producer/Multiple-consumer queue > I know about the lockfree library, I've read the book underlying it (the Art of Multiprocessor Programming), and think I've understood at least 80% of it. My problem is not multiple producer multiple consumer queue, so it doesn't work for me. In particular, although there are multiple log producers, there is no consumer. They log into a ring buffer, and normally nobody would care and the log entries get overwritten by new entries (I want to avoid having to wait when logging). When the reader wants to read, it simply dumps everything in the ring buffer, and won't change the status of the buffer (i.e., it doesn't "consume"). And I don't care if the reader found a few entries are busy being overwritten, it just has to know about that so as to avoid using the data (which leads to wrong output and could lead to crash). The problem is in fact a lot easier than any of the queues / stacks that is implemented by lockfree. I've also inspected the assembly generated by g++ over my code in x86-64, and I think it is okay (i.e., no reordering with non-atomic statement is done by the compiler -- together with the strong consistency guarantee under x86-64 the code should be okay I think). Of course, "okay for one version of a brand of compiler and library under one platform" does not mean my program is correct: a new version of the compiler / library could break it, which is my main worry. But I've got something more fundamental to ask: what the memory model really means, and what to do once we (inevitably) move away from Boost and join the C++1x/y/z family. It seems to me that the C++ standard provides something quite a bit weaker than what Boost promises, and I don't know how to get the Boost promise from the C++ standard. That's the other reason why I ask. > Le 15/04/2015 08:42, Isaac To a ?crit : > > > I'd like to write a C++ object where there are many logger threads > > logging to a large global (non-atomic) ring buffer, with an occasional > > reader thread which wants to read as much data in the buffer as > > possible. I ended up having a global atomic counter where loggers get > > locations to write to, and each logger increments the counter > > atomically before writing. The reader tries to read the buffer and > > per-logger local (atomic) variable to know whether particular buffer > > entries are busy being written by some logger, so as to avoid using them. > Regards, Isaac

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Re: [Boost-users] Possible to use with JNI?
by Lorenzo Trivelli 15 Apr '15

15 Apr '15

At 06:30 13/04/2015, you wrote: >Hi, I really need to use Java with this library. Is it possible to use JNI on this library or do I need to convert this library to Java? I find the latter task is going to be really difficult so I hope that I can use JNI. > >Thank you for your help. Hi, AFAIK it is not easy to do that due to C++ name mangling and the absence of any ABI in C++ itself like C A possible but limited workaround should be to create a DLL with a C interface which uses the boost objects you need. Next, you can call it through JNI, but obviously you can pass only basic data types regardds Lorenzo

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[asio][bind] Access violation with placeholders used by static objects
by Olivier Sauvageau 15 Apr '15

15 Apr '15

Hello, I had an access violation issue using boost::asio::placeholders::error as parameter to boost::bind in a class that was used as type for a static class member object. I realized that the placeholders, both those in Asio and those in Bind (e.g., _1) are themselves static objects, and thus found out that my problem was due to the famous undefined order of initialization of static objects. I was able to fix my problem simply by encapsulating my static object in a function and making sure it's called only after main() has started. However, I'm still wondering, has this issue ever been discussed and any correction or alternative proposed? I couldn't find anything on the topic. On the other hand, I noticed that Asio's placeholders are initialized from functions, e.g. from <boost/asio/placeholders.hpp>: boost::arg<1>& error = boost::asio::placeholders::detail::placeholder<1>::get(); Using that function instead could be an alternative, but since it is not in the "public" namespace and is not in the library documentation, using it would not be a good idea for maintainability. Finally, is there any documentation stating the fact that placeholders such as boost::asio::placeholders::error and _1 are static? I can't find any in the Asio or Bind documentation, and I feel this is a limitation that should at least be documented. Thank you, -- Olivier Sauvageau

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Serialization of boost::shared_ptr - wrong ref. count?
by Josef Uher 15 Apr '15

15 Apr '15

Hi All, I am using serialisation of boost::shared_ptr objects. Saving/loading works fine, except that I found out that all shared_ptr objects have reference count (use_count) minimum of 2 even though they should have 1! Debugging into the boost’s code I found out that the ref. count is increased to value of 2 in “shared_ptr_helper.hpp”, line 181 where the pointer is stored inside map “m_o_sp”. This map however never gets deleted and hence the shared_ptr seems to be stored there for ever. Please, am I doing something wrong or is there a bug? How to fix this? The sample code I use is below. I would like to emphasise that I make sure the archives are deleted after being used. So it should release the resources. I am using Mac OS X 10.10.2, boost version 1.57.0 Thank you for help, Josef **************** #include <boost/iostreams/device/file_descriptor.hpp> #include <boost/iostreams/filtering_stream.hpp> #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp> #include <boost/serialization/shared_ptr.hpp> #include <boost/make_shared.hpp> class SOBJ { public: friend class boost::serialization::access; virtual void SerializationHelperFcn() {} SOBJ() { std::cout << "SOBJ Constructor" << std::endl; } virtual ~SOBJ() { std::cout << "SOBJ Destructor" << std::endl; } double value=0.; template<typename Archive> void serialize(Archive &ar, const unsigned int ver) { ar & boost::serialization::make_nvp("value", value); } }; void shared_ptr_serialization_test() { boost::shared_ptr<SOBJ> out=boost::make_shared<SOBJ>(); { boost::iostreams::filtering_ostream ofs; ofs.push(boost::iostreams::file_descriptor_sink("/Users/juhe/stest.xml")); boost::archive::xml_oarchive oa(ofs); oa << boost::serialization::make_nvp("tag", out); } boost::shared_ptr<SOBJ> in=nullptr; { boost::iostreams::filtering_istream ifs; ifs.push(boost::iostreams::file_descriptor_source("/Users/juhe/stest.xml")); boost::archive::xml_iarchive ia(ifs); ia >> boost::serialization::make_nvp("tag", in); } std::cout << "out.use_count()=" << out.use_count() << std::endl; std::cout << "in.use_count() =" << in.use_count() << std::endl; } ****************

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Project linking problem with boost
by Max 15 Apr '15

15 Apr '15

Hello, The problem here relates to boost, but I'm aware it may of more general nature rather than boost specific. I had a weird problem with my project. It has a bunch of dependencies including many of the boost libraries. My platform is: Win7SP1 + VS2008SP1 + boost1.39.0. I have properly set the VC++ directories for both include and lib files pointing to the boost folder (1.39.0) and of course those for other dependencies. But I got the following message when I built the project: 1>Linking to GSL lib1>Linking to lib file: CGAL-vc90-mt.lib1>Linking to lib file: libboost_date_time-vc80-mt-1_34.lib1>Linking to lib file: libboost_regex-vc80-mt-1_34.lib I don't know why VS was attempting to link to libs of boost 1.34.0 built with VC80 (I'm using VC 90 - VS2008) Could anybody please give me some hints about this problem or where the message like "Linking to lib file: ..." came from? Thanks. Best regards, Max

3 2

Possible to use with JNI?
by Yolanda Septiana 15 Apr '15

15 Apr '15

Hi, I really need to use Java with this library. Is it possible to use JNI on this library or do I need to convert this library to Java? I find the latter task is going to be really difficult so I hope that I can use JNI. Thank you for your help.

2 2

boost vs std atomic sequential consistency semantics
by Isaac To 15 Apr '15

15 Apr '15

I've asked the question in stack overflow, but no luck there. I hope I will see some light here. I'd like to write a C++ object where there are many logger threads logging to a large global (non-atomic) ring buffer, with an occasional reader thread which wants to read as much data in the buffer as possible. I ended up having a global atomic counter where loggers get locations to write to, and each logger increments the counter atomically before writing. The reader tries to read the buffer and per-logger local (atomic) variable to know whether particular buffer entries are busy being written by some logger, so as to avoid using them. So I have to do synchronization between a pure reader thread and many writer threads. I sense that the problem can be solved without using locks, and I can rely on "happens after" relation to determine whether my program is correct. I've tried relaxed atomic operation, but it won't work: atomic variable stores are releases and loads are acquires, and the guarantee is that some acquire (and its subsequent work) always "happens after" some release (and its preceding work). That means there is no way for the reader thread (doing no store at all) to guarantee that something "happens after" the time it reads the buffer, which means I don't know whether some logger has overwritten part of the buffer when the thread is reading it. So I turned to sequential consistency. For me, "atomic" means Boost.Atomic, which notion of sequential consistency has a "pattern" documented <http://www.boost.org/doc/libs/1_57_0/doc/html/atomic/thread_coordination.ht…> : The third pattern for coordinating threads via Boost.Atomic uses seq_cst for coordination: If ... 1. thread1 performs an operation A, 2. thread1 subsequently performs any operation with seq_cst, 3. thread1 subsequently performs an operation B, 4. thread2 performs an operation C, 5. thread2 subsequently performs any operation with seq_cst, 6. thread2 subsequently performs an operation D, then either "A happens-before D" or "C happens-before B" holds. Note that the second and fifth lines say "any operation", without saying whether it modify anything, or what it operates on. This provides the guarantee that I wanted. All is happy until I watch the talk of Herb Sutter titled "atomic<> Weapons". What he implied is that seq_cst is just a acq_rel, with the additional guarantee of consistent atomic stores ordering. The suggestion that sequentially consistent atomic operations may be re-ordered with non-atomic operations only adds to my mystery. I turned to the cppreference.com <http://en.cppreference.com/w/cpp/atomic/memory_order>, which have similar descriptions. So my questions: 1. Does C++11 and Boost Atomic implement the same memory model? 2. If (1) is "yes", does it mean the "pattern" described by Boost is somehow implied by the C++11 memory model? How? Or does it mean the documentation of either Boost or C++11 in cppreference is wrong? 3. If (1) is "yes", but (2) is "Boost documentation is incorrect", is there any way to achieve the effect I want, namely to have guarantee that (the work subsequent to) some atomic store happens after (the work preceding) some atomic load? 4. If (1) is "no", is there any way to achieve the effect I want in C++11?

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Re: [Boost-users] Unable to build old project using boost
by Max 13 Apr '15

13 Apr '15

----- Original Message ----- From: John Maddock <jz.maddock(a)googlemail.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Unable to build old project using boost Date: 2015-04-13 00:08 On 12/04/2015 15:24, Juan Ramírez wrote: It seems that boost wasn't compiled with VC++ 9. The macro BOOST_NO_RVALUE_REFERENCES is not defined, which means boost thinks the compiler supports rvalue references. Since the code is header only, how Boost was built is irrelevant - but there must be some mismatch between what Boost.Config is doing and what type_traits expects. The only thing I can think of that would cause that are either: * A really really old version of Boost.Config with a newer version of type_traits - not sure how you would manage that though, or... * You have a custom config (in boost/config/user.hpp) which is setup for a newer MSVC version. If all else fails, try with a fresh boost source tree, HTH, John. ------------------------------------------------------- Thank you very much John. I didn't changed anything of the boost installation whatsoever, except for the build itself, before that problem.I was using exactly the same thing as I did 2 yearly ago, when it worked. Now it works, for boost 1.39.0, 1.49.0 and 1.57.0. But I cannot think of anything that I did made the difference. Best regards,Max On Sat, Apr 11, 2015 at 10:33 AM, Edward Diener <eldiener(a)tropicsoft.com> wrote: On 4/11/2015 6:33 AM, Max wrote: Hi guys, This must be a trivial question, but I just couldn't sort it out. I'm compiling a old project which used to work fine. But now I received a bunch of errors (this is not a surprise because the project have a lot of other dependencies and I'm in the way of setting them up) with the first one as: c:\lib\boost_1_49_0\boost\type_traits\add_lvalue_reference.hpp(19) : error C2143: syntax error : missing ',' before '&&' I'm using Win 7 SP1 + VS 2008 with SP + boost 1.49.0 (I'm using this because I previous used this. If this works fine, I will consider migrating to the latest version) Thanks for any hints. If you are using an older version of Boost and it was working before and now it is not working, something must have changed. Try to determine what might have changed. You also need to show source code you are compiling when the error occurs. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -- Juan :wq _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Re: [Boost-users] Unable to build old project using boost
by Max 13 Apr '15

13 Apr '15

----- Original Message ----- From: Juan_Ramírez <juanantonio.ram(a)gmail.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Unable to build old project using boost Date: 2015-04-12 22:24 It seems that boost wasn't compiled with VC++ 9. The macro BOOST_NO_RVALUE_REFERENCES is not defined, which means boost thinks the compiler supports rvalue references. On Sat, Apr 11, 2015 at 10:33 AM, Edward Diener <eldiener(a)tropicsoft.com> wrote: On 4/11/2015 6:33 AM, Max wrote: Hi guys, This must be a trivial question, but I just couldn't sort it out. I'm compiling a old project which used to work fine. But now I received a bunch of errors (this is not a surprise because the project have a lot of other dependencies and I'm in the way of setting them up) with the first one as: c:\lib\boost_1_49_0\boost\type_traits\add_lvalue_reference.hpp(19) : error C2143: syntax error : missing ',' before '&&' I'm using Win 7 SP1 + VS 2008 with SP + boost 1.49.0 (I'm using this because I previous used this. If this works fine, I will consider migrating to the latest version) Thanks for any hints. If you are using an older version of Boost and it was working before and now it is not working, something must have changed. Try to determine what might have changed. You also need to show source code you are compiling when the error occurs. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -- Juan:wq _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users Thank you. My boost was built with VC++ 9. And when add #define BOOST_NO_RVALUE_REFERENCES, other errors arose - actually, VS2008 supports rvalue references. Best regards,Max

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building 64bit boost on aix 6.1
by 임영운 13 Apr '15

13 Apr '15

hi, I'm newbie. the only one thing that I wanted to ask is building boost 64bit on aix6.1. I try it a number of times. and I failed building 64bit boost objects. It built only 32bit objects. I used this option, address-model=64. but it didn't work. would you tell me how to build boost 64bit on aix6.1 thanks read this msg. 주식회사 테미 임영운(Yeong-woon Im) 305-764 대전광역시 유성구 대학로99 충남대학교 산학연교육연구관 807호 #807, TBI Center, Chungnam University 99 Daehak-ro, Yuseong-gu, Deajeon, 305-764 Korea Home URL : http://www.temee.co.kr Tel : 042-824-7014 Fax : 042-824-7015 Mobile : 010-6266-9960

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Unable to build old project using boost
by Max 12 Apr '15

12 Apr '15

Hi guys, This must be a trivial question, but I just couldn't sort it out. I'm compiling a old project which used to work fine. But now I received a bunch of errors (this is not a surprise because the project have a lot of other dependencies and I'm in the way of setting them up) with the first one as: c:\lib\boost_1_49_0\boost\type_traits\add_lvalue_reference.hpp(19) : error C2143: syntax error : missing ',' before '&&' I'm using Win 7 SP1 + VS 2008 with SP + boost 1.49.0 (I'm using this because I previous used this. If this works fine, I will consider migrating to the latest version) Thanks for any hints. Best regards, Max

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Re: [Boost-users] Unable to build old project using boost
by Max 12 Apr '15

12 Apr '15

----- Original Message ----- From: Edward Diener <eldiener(a)tropicsoft.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Unable to build old project using boost Date: 2015-04-11 21:33 On 4/11/2015 6:33 AM, Max wrote: > Hi guys, > > > This must be a trivial question, but I just couldn't sort it out. > > > I'm compiling a old project which used to work fine. But now I received > a bunch of errors (this is not a surprise because the project have a lot > of other dependencies and I'm in the way of setting them up) with the > first one as: > > > c:\lib\boost_1_49_0\boost\type_traits\add_lvalue_reference.hpp(19) : > error C2143: syntax error : missing ',' before '&&' > > > I'm using Win 7 SP1 + VS 2008 with SP + boost 1.49.0 (I'm using this > because I previous used this. If this works fine, I will consider > migrating to the latest version) > > > Thanks for any hints. If you are using an older version of Boost and it was working before and now it is not working, something must have changed. Try to determine what might have changed. You also need to show source code you are compiling when the error occurs. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Thank you Edward, To round the culprit of the problem, I created another empty win32 console app using the appwizard.But by just adding the single line of #include <boost/algorithm/string.hpp> caused the same problem: #include "stdafx.h" #include <boost/algorithm/string.hpp> int _tmain(int argc, _TCHAR* argv[]){ return 0;} The error messages: 1>C:\Lib\Coin-3.0.0\include\boost/utility/enable_if.hpp : warning C4819: The file contains a character that cannot be represented in the current code page (936). Save the file in Unicode format to prevent data loss1>C:\Lib\Coin-3.0.0\include\boost/utility/enable_if.hpp : warning C4819: The file contains a character that cannot be represented in the current code page (936). Save the file in Unicode format to prevent data loss1>c:\Lib\boost_1_49_0\boost/type_traits/add_rvalue_reference.hpp(46) : error C2059: syntax error : '&&' Thank you. Best regards,Max

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Newbie question: Example of a simple grammar and autocompletion?
by Vidya Setlur 10 Apr '15

10 Apr '15

Hi all, I'm trying to understand how the Boost spirit parsers work. Could anyone show me a simple example of a grammar, and how autocompletion can be enabled if the input matches a particular rule in the grammar template? Thanks!

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SSL certificate expired
by Martin Honermeyer 10 Apr '15

10 Apr '15

Hi, I just wanted to post a note in case administrators are not yet aware: The SSL certificate for *.boost.org has expired and needs to be replaced. This affects e.g. https://svn.boost.org/. Best, Martin

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FW: [phoenix][spirit][qi][utility] Version 1.57 of Boost Phoenix breaks when used with MSVC 2010 compiler?
by Andrew Nordquist 09 Apr '15

09 Apr '15

Hello, Boost Phoenix folks - I sent the message below a few weeks ago, looking for assistance in getting Boost 1.57 to compile with MSVC 2010 and my complex C++ code. I have yet to receive a response. Perhaps it was misdirected; maybe I need to send this to [spirit] or [qi] or [utility] or ...? In the weeks since I sent this, I have not exactly been idle on the subject. I have installed Boost 1.54, 1.55, and 1.56 on my computer. I have in turn tried each version by just switching out the include and linker locations. So far, I have found out that 1.53, 1.54, and 1.55 compile successfully. However, switching to 1.56 or 1.57, there is no success. The diagnostics for both versions are similar, regarding too few template arguments for a call to [utility] result_of.hpp that <boost/phoenix/core/detail/preprocessed/function_eval_10.hpp> is making. Does anyone have any ideas or suggestions on how to make Boost 1.57 work with MSVC 2010 and my code? I would be grateful. Thank you, /Andrew Nordquist From: Andrew Nordquist Sent: Thursday, March 19, 2015 12:35 PM To: 'boost-users(a)lists.boost.org' Subject: [Phoenix] Version 1.57 of Phoenix breaks when used with MSVC 2010 compiler? Hello, folks - I must be doing something wrong, but I can't figure it out. I/we have been using Boost in our 20,000+ lines of C++ code for a few years now. We started with 1.43, went smoothly to 1.53, and although it was bumpy going from MSVC 2008 to MSVC 2010, we are there now. We are now using MSVC 2010 and Boost 1.53. We use many routines, including Phoenix, Spirit, bind, tie, etc. I am attempting to migrate to Boost 1.57. Got clobbered with about 400 lines of unexpected diagnostic in the compiler. That is the attached file. In the file, the lines showing the files named "cutoffitem.cpp" and "densitydelegate.cpp" are ours, but what is between these two lines is coming from Boost. It appears that it could be a C++11 type of problem, but I'm not sure . I read about that potential problem with the [utility] [result_of] class template in the report designated n3276 and in the 1.57 [utility] documentation. I think the major concern with this issue was going to Boost 1.52. In our code, I tried a quick-fix precompiler #define, but it did not work. Got any ideas? I'm about to go back to version 1.53, at least until I upgrade to Visual Studio 2013. Thank you, /Andrew Nordquist Research Analyst Southwest Research Institute San Antonio, TX, USA

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Multiple defined symbols
by Lloyd 09 Apr '15

09 Apr '15

Hi, I have a "dll" project which is dependent on boost libraries like thread and system. When I compile my project I gen error like libboost_thread-vc120-mt-gd-1_57.lib(thread.obj) : error LNK2005: "public: virtual __thiscall boost::detail::thread_data_base::~thread_data_base(void)" (??1thread_data_base@detail@boost@@UAE@XZ) already defined in boost_thread-vc120-mt-gd-1_57.lib(boost_thread-vc120-mt-gd-1_57.dll) What I understood from this error is, my project is trying to link to both dynamic and static boost libraries. I only want to link to the boost thread dll. To my knowledge am not directly using any boost autolink feature. In the visual studio linking option I have mentioned only the "boost_thread-vc120-mt-gd-1_57.lib". Why could it be trying to link to libboost_thread-vc120-mt-gd-1_57.lib? Is there any way to find where this is happening? Thanks, Lloyd

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[units] non-rational scaling
by Matthias Wohlgemuth 08 Apr '15

08 Apr '15

Dear all, I have an issue with scaled units. I tried to implement a non-rational scaling of units adapted from scale<> class (all in boost::units namespace): template<class Derived> struct non_rational_scale { static const unsigned long base = 10; typedef boost::units::static_rational<0> exponent; typedef double value_type; static double value() { return Derived::value(); } static std::string name() { return Derived::name(); } static std::string symbol() { return Derived::symbol(); } }; struct electron_volt_scale : non_rational_scale<electron_volt_scale> { static double value() { return 1.60218e-19; } /* elementary charge in Coulombs */ static std::string name() { return "electron volt"; } static std::string symbol() { return "eV"; } }; typedef make_scaled_unit<si::energy, electron_volt_scale>::type electron_volt; This works fine in one direction: quantity<si::energy>(1.*electron_volt()); /* gives 1.60218e-19 J. */ However, in the other direction quantity<electron_volt>(1.*si::joule); /* gives 1 eV */ I guess, that I need some specialization for non_rational_scale to workout the correct scaling factor in the reverse direction. Thank you for your help, Matthias

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Can't build boost 1.57 for MinGW
by Jabaa 07 Apr '15

07 Apr '15

Dear all, I can't build boost 1.57 for MinGW on Win7. I tried D:\boost_1_57_0>bootstrap.bat mingw D:\boost_1_57_0>.\b2 toolset=gcc install and I only got D:/boost_1_57_0/tools/build/src/tools\msvc.jam:1075: in configure-really *** argument error * rule generate-setup-cmd ( version : command : parent : options * : cpu : global-setup : default-global-setup-options : default-setup ) * called with: ( 9.0 : C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\bin : C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC : <command>C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\bin\cl.exe : i386 : : x86 : vcvars32.bat ) * missing argument global-setup D:/boost_1_57_0/tools/build/src/tools\msvc.jam:809:see definition of rule 'generate-setup-cmd' being called D:/boost_1_57_0/tools/build/src/tools\msvc.jam:201: in configure D:/boost_1_57_0/tools/build/src/tools\msvc.jam:153: in msvc.init D:/boost_1_57_0/tools/build/src/build\toolset.jam:43: in toolset.using D:/boost_1_57_0/tools/build/src/build\project.jam:1007: in using project-config.jam:3: in modules.load D:/boost_1_57_0/tools/build/src\build-system.jam:249: in load-config D:/boost_1_57_0/tools/build/src\build-system.jam:412: in load-configuration-files D:/boost_1_57_0/tools/build/src\build-system.jam:524: in load D:\boost_1_57_0\tools\build\src/kernel\modules.jam:289: in import D:\boost_1_57_0\tools\build\src/kernel/bootstrap.jam:139: in boost-build D:\boost_1_57_0\boost-build.jam:17: in module scope What is wrong? Thanks

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1.58.0 rc2 is now available
by Marshall Clow 06 Apr '15

06 Apr '15

Release candidate files for 1.58.0 are available at: http://boost.cowic.de/rc/ Since rc1, the changes that were causing the serialization libraries to fail to build on MSVC have been reverted. As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. This helps ensure the candidates build OK before we push them out to SourceForge. The files (and associated md5s) are: MD5 (boost_1_58_0_rc2.7z) = 43e0d47cc9f5f2a07761808b9da57c0a MD5 (boost_1_58_0_rc2.tar.bz2) = 52147381c97685eb045b5b022ad51a35 MD5 (boost_1_58_0_rc2.tar.gz) = cb33afaa557dea2f700bffec8a91d87e MD5 (boost_1_58_0_rc2.zip) = 412676a9a7d9903eb5a260209ad78f0a Thanks! -- The release managers P.S. Release notes are here: http://www.boost.org/users/history/version_1_58_0.html

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[1.58.0] Release candidates available
by Marshall Clow 06 Apr '15

06 Apr '15

Release candidate files for 1.58.0 are available at: http://boost.cowic.de/rc/ As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. This helps ensure the candidates build OK before we push them out to SourceForge. The files (and associated md5s) are: MD5 (boost_1_58_0_rc1.7z) = 609ea035fd3b9f1da110f640c9b8d1e6 MD5 (boost_1_58_0_rc1.tar.bz2) = 7edf680e2532a0370bce64e8e847d661 MD5 (boost_1_58_0_rc1.tar.gz) = 0e435db6a5963e58ffa8d7df49ab5846 MD5 (boost_1_58_0_rc1.zip) = a8d1761306a2ea020e92de53a5cae82d Thanks! -- The release managers P.S. Release notes are here: http://www.boost.org/users/history/version_1_58_0.html

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Call for Papers for Meeting C++ 2015 ends on Wednesday
by Jens Weller 05 Apr '15

05 Apr '15

Hello Boost & Qt Community, the call for papers for this years Meeting C++ Conference got extended and ends on Wednesday(April 8th) next week! Especially talks about libraries have still a good chance to get voted into the conference, and also the embedded theme track! CfP announcement: http://meetingcpp.com/index.php/newsreader/items/call-for-papers-for-meetin… The voting will begin shortly after the end of the CfP and run ~10 days, this will give me guidance to select the right talks for this years conference! thanks, Jens Weller

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error: Name clash for '<p/home/nr/dev/dist/boost/lib>libboost_system.a'
by Nathan Ridge 04 Apr '15

04 Apr '15

Hi, I just downloaded the boost 1.58 beta. Tried to build with: ./b2 --with-filesystem --with-system --with-atomic --with-chrono --with-date_time --with-program_options --with-regex --with-test --with-thread --with-random --with-context --with-coroutine variant=release link=static runtime-link=static threading=multi toolset=gcc cxxflags=-Wno-unused-local-typedefs install Got the following error: Performing configuration checks - 32-bit : no - 64-bit : yes - arm : no - mips1 : no - power : no - sparc : no - x86 : yes - lockfree boost::atomic_flag : yes - lockfree boost::atomic_flag : yes - has_icu builds : no error: Name clash for '<p/home/nr/dev/dist/boost/lib>libboost_system.a' error: error: Tried to build the target twice, with property sets having error: these incompabile properties: error: error: - none error: - <address-model>64 <architecture>x86 error: error: Please make sure to have consistent requirements for these error: properties everywhere in your project, especially for install error: targets. Some googling reveals that people suggest adding '--without-context --without-coroutine' to work around the problem, but this is not an option for me because I use these libraries! What can I do to fix this? Thanks, Nate

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[polygon] Voronoi diagram: weird results
by Jeremy Murphy 03 Apr '15

03 Apr '15

Hi, I started using the voronoi_diagram functionality recently and am getting some weird results that I need help interpreting. Here is an example: https://drive.google.com/open?id=0B9-L1xN12iKVYUlMb1hLY0FEMWs&authuser=0 What you can see here is a salmon (?) coloured layer of polygons (input) underneath a semi-transparent layer of pale blue polygons (output) and a boundary. So you can see that some of the output looks 'good', as in, regular and usable, but on the right-hand side there is some obvious 'bad' results that I cannot completely explain. The missing polygons are almost certainly because I have culled any polygons from the output that included points outside the boundary. But there are also appears to be some 'bad' polygons in the output that overlap 'good' ones. So I guess my initial question is: is this a typical symptom of something that other users of the voronoi_diagram recognize? I'm using Boost.Geometry for all other geometric processing. Thanks, cheers. Jeremy

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FW: [log] Is there a way to copy the initial log of a rolling log set
by Marc F. Houde 02 Apr '15

02 Apr '15

Greetings, I am using boost::log with a text_file_backend sink with file rotation for logging on a long running application. I have set it up to clear earlier logs when the logging directory reaches a certain size, but I would like to preserve the initial log as it contains useful configuration information that may not be repeated in later logs. I thought I might be able to do this using set_close_handler, and making a copy but there does not appear to be a way to get the actual file information. Thanks, Marc [ASG]<http://www.asg.com/> Marc Houde, Sr Software Engineer marc.houde(a)asg.com<mailto:marc.houde@asg.com> | 703.464.1624 www.asg.com<http://www.asg.com/> | 800.333.8666 USA Only Facebook<https://www.facebook.com/ASGSoftwareSolutions> | LinkedIn<https://www.linkedin.com/company/asg> | Twitter<https://twitter.com/#!/asgsoftware> | YouTube<https://www.youtube.com/asgtech>

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[boost][units] reciprocal conversion / inter unit conversion
by Matthias Wohlgemuth 02 Apr '15

02 Apr '15

Dear users, I just started to use boost::units for some simulations. However, I have some problems with unit conversions and I hope someone can help me. Let's say I have a quantity given in terms of energy in "electron volts" (eV) with the unit "energy". I defined the unit the following: BOOST_UNITS_DEFINE_BASE_UNIT_WITH_CONVERSIONS(si, electron_volts, "electron volts", "eV", PHYSICAL_CONSTANT_DVALUE(e), si::energy, 5000); namespace si { typedef make_system<electron_volts_base_unit>::type electron_volt_system; typedef unit<energy_dimension,si::electron_volt_system> electron_volt_type; BOOST_UNITS_STATIC_CONSTANT(eV,electron_volt_type); } where PHYSICAL_CONSTANT_DVALUE(e) gives me the double representation of si::constants::codata::e.value(). This works fine, for conversions like eV=>Joule etc. (By the way, is there a more straight forward way, to define non-rational scaled units, than defining a new unit sytem?) Now I want to convert eV to nanometers (wavelength) This is defined as: wavelength = c/frequency = h*c/energy (c=speed of light, h = Planck's constant) I would again define a system with the base unit of wavelength and the unit wavelength_type initialized e.g. with wavelength_nanometer. First Problem: What would be the derived dimension/unit: energy, length or a new dimension like wavelength_dimenson? If I would define it as something else than energy, I will have problems when using quantity<si::electron_volt_type>(x*si::wavelength_nanometer) or quantity<si::nanometer_type>(x*si::eV) Second problem: The relationship is reciprocal: wavelength ~ 1/energy. How do I define a proper conversion? Thanks for your help! Cheers, Matthias

1 0

Cross compiling boost 1.55 static libs
by Pham Ngoc Hai 01 Apr '15

01 Apr '15

Hi guys, I'm trying to cross compile boost for armhf but some of the functions seem to be missed.I'm using croos-tool ng, gcc-4.8 =================================For example in file system, boost::filesystem::detail::status is not there: nm stage/lib/linux_armv7/libboost_filesystem.a | grep status [returns nothing] ================================= I take a look on an existing ubuntu.14.04 armhf nm libboost_filesystem.a | grep status 00000048 t _ZN12_GLOBAL__N_113dir_itr_firstERPvS1_PKcRSsRN5boost10filesystem11file_statusES8_.isra.29.constprop.49 00001cf4 T _ZN5boost10filesystem6detail14symlink_statusERKNS0_4pathEPNS_6system10error_codeE 000019c0 T _ZN5boost10filesystem6detail6statusERKNS0_4pathEPNS_6system10error_codeE 00001b54 T _ZNK5boost10filesystem15directory_entry12m_get_statusEPNS_6system10error_codeE 00001e98 T _ZNK5boost10filesystem15directory_entry20m_get_symlink_statusEPNS_6system10error_codeE ================================= my project-config.jam: # Boost.Build Configuration # Automatically generated by bootstrap.sh import option ; import feature ; # Compiler configuration. This definition will be used unless # you already have defined some toolsets in your user-config.jam # file. #if ! gcc in [ feature.values <toolset> ] #{ using gcc : armhf : arm-unknown-linux-gnueabi-g++ : <compileflags>-fexpensive-optimizations <compileflags>-O3 <compileflags>-march=armv7-a <compileflags>-mtune=cortex-a9 <compileflags>-mfpu=neon <compileflags>-mfloat-abi=hard <compileflags>-ftree-vectorize <compileflags>-ffast-math <compileflags>-funsafe-math-optimizations <compileflags>-pipe <compileflags>-fwhole-program <compileflags>-fpermissive <compileflags>-fPIC ; #} project : default-build <toolset>gcc ; # Python configuration using python : 2.7 : ; # List of --with-<library> and --without-<library> # options. If left empty, all libraries will be built. # Options specified on the command line completely # override this variable. libraries = ; # These settings are equivivalent to corresponding command-line # options. option.set prefix : /usr/local ; option.set exec-prefix : /usr/local ; option.set libdir : /usr/local/lib ; option.set includedir : /usr/local/include ; # Stop on first error option.set keep-going : false ; ================================= I use this patch to fix the zlib problem in boost_1.55 cat no_zlib.diff Index: libs/iostreams/build/Jamfile.v2 --- libs/iostreams/build/Jamfile.v2 (revision 6521) +++ libs/iostreams/build/Jamfile.v2 (working copy) @@ -159,8 +159,6 @@ : $(sources) : <link>shared:<define>BOOST_IOSTREAMS_DYN_LINK=1 <define>BOOST_IOSTREAMS_USE_DEPRECATED - [ ac.check-library /zlib//zlib : <library>/zlib//zlib - <source>zlib.cpp <source>gzip.cpp ] : : <link>shared:<define>BOOST_IOSTREAMS_DYN_LINK=1 ; ================================= my b2 command: ./b2 link=static threading=multi --tool-set=gcc-armhf --without-python -sNO_COMPRESSION=1

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[Graph] Reserving graph memory (again)
by Sensei 01 Apr '15

01 Apr '15

Dear all, Reading all the documentation online about memory reservation in a graph, I am still wondering if it would be possible to reserve memory in advance. With a vecS container it would be quite an advantage to reserve memory, but let me be clear, I am not saying that I know the number of edges in advance, so CRS isn't an option. Until now I know of two ways to do this. The first is to add & remove an edge: add_edge(0, num_vertices(g) + list.size() - 1, g); remove_edge(0, num_vertices(g) + list.size() - 1, g); however, it won't work in my context since I could (as you see from the code) add edges to an existing graph, and I am getting weird results. I am sure this is due to my code, however, add/remove isn't really a neat solution. The second option is weird: g.m_vertices.resize(list.size() - 1); This could be used, but m_* members should, as far as I understand, be private or protected. Is there any other nice possibility? For instance, a static function in the traits that reserves memory? In case, why this cannot be done by BGL APIs? Thanks!

1 0

[asio]
by georg＠schorsch-tech.de 31 Mar '15

31 Mar '15

Hi all, currently i try to understand boost asio a little better. Right now, i just had a very simple asio program and started 2 timers asyncronously. i expected the timer t to complete after the timer i. //-------<----------------- Current output: 10 s. 1 s. //-------<----------------- Expected output: 1 s. 10 s. //-------<----------------- Shouldn't complete the async_wait with 1 sec complete prior the 10 sec async_wait? I am on Windows 7 x64/ MSVC 2013(VS12) / Boost 1.57.0. Regards Georg //-------<----------------- #include <boost/asio.hpp> #include <boost/system/error_code.hpp> #include <iostream> void wait_handler(const boost::system::error_code &ec) { if (!ec) std::cout << "10 s." << std::endl; } void irq_handler(const boost::system::error_code &ec) { if (!ec) std::cout << "1 s." << std::endl; } int main() { boost::asio::io_service io_service; boost::asio::deadline_timer t(io_service, boost::posix_time::seconds(10)); boost::asio::deadline_timer i(io_service, boost::posix_time::seconds(1)); t.async_wait(&wait_handler); t.async_wait(&irq_handler); io_service.run(); } //-------<-----------------

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Serialization cumulatively.
by Tony Camuso 30 Mar '15

30 Mar '15

I'm trying to serialize the data from multiple passes of an app on various files. Each pass generates data that must be serialized. If I simply append each serialization, then deserialization will only occur for the first instance, since the number of records read by the deserialization will only be for the first instance. What I'm doing is deserializing on each new pass, deleting the original file, and then serializing everything again with the new information. If there were only a few files to process, this would not be a problem. However there are thousands of files. Additionally, on each new pass, I am checking to see if a certain type of record has already been saved. So, with every pass, I must look up in a deeper and deeper database. Currently, it's taking almost an hour to process about 3000 files, with an average of 55,000 lines per file. It is a huge amount of data. However, I'm looking for a way to reduce the length of time it takes to do this processing. Does anybody have a better idea than to cycle through the serialize-deserialize-lookup-serialize sequence for each file?

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gicatena
by gicatena 29 Mar '15

29 Mar '15

Wei zio!, http://dronepromocodes.com/rwyw/nbfqqnawiivmwaqogeijytr.dkroguozxdavjgpqlor… 3/29/2015 3:11:42 AM

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[gsoc15] Please help rank GSoC 2015 student projects
by Niall Douglas 27 Mar '15

27 Mar '15

Dear Boost Community, The Google Summer of Code 2015 proposals for Boost are in, and we would deeply appreciate the community's help in ranking the proposals according to merit before the 6th of April. To vote, the process is easy: 1. Go to this page https://www.google-melange.com/gsoc/homepage/google/gsoc2015 and click the "Log in" button under Mentors and Administrators. 2. Now click "Create Profile" on the same page. Note that even if you registered last year, you must register again in 2015. Fill in the form. Note that after submitting it drops you at "Edit Profile", which is confusing. 3. Click "My Dashboard", then "Connect with organisations". 4. Choose "Boost C++ Libraries". 5. In the message box, write this: "I am a member of the Boost community and the email(s) I normally post to boost mailing lists with is <email>" filling in the email address(es) you normally use to post to boost mailing lists. This lets us verify that you are indeed a long standing member of the Boost community. 6. Once we approve your request, you will get an email with the subject "Welcome as organisation member". You can now return to the Dashboard on the GSoC website where there will be a new item "Proposals". 7. Work your way through as many of the 33 proposals as you can. You can score them using the stars at the bottom of each proposal page, taking care to read any comments by the mentors and students if present. PLEASE try to rank some of the lowest scored proposals, every year we get a lot of people who only rank the top five and don't bother with the rest. Try to score on the priority basis of: (i) ability to write quality C++, using the programming competency test or samples of programming the student supplied. (ii) proposal quality and your best estimate of the student's understanding of how best to solve the problem at hand. Bear in mind a gifted programmer with a strong work ethic but poor English may appear to not understand the problem as well as native English speakers, this is why we have asked for examples of their programming competency. (iii) if the student came early to the mailing lists to ask for help writing the proposal (the mentors who helped them with their proposals have usually indicated this in the private comments). (iv) usefulness/appropriateness of the feature or work being proposed. Remember a good GSoC is more about getting promising new engineers into Boost and C++ than necessarily getting code to pass Boost peer review in a single summer. 8. Optional: If a proposal looks especially great to you and you feel able to mentor a student this year, please slide the "wish to mentor" button. Just because a proposal already has willing mentors does NOT mean you should not add yourself - if you can substitute for an existing mentor, that may mean we use that mentor for another proposal. As you know, Google Summer of Code is usually worth $42,000 - $48,000 to Boost each year, and a successful GSoC raises our visibility and reputation in the wider open source community. Our thanks to you in advance for taking the time to vote. Niall Douglas Boris Schäling --- Boost C++ Libraries Google Summer of Code 2015 admin https://svn.boost.org/trac/boost/wiki/SoC2015

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problems using boost::polygon::get_rectangles
by TomDrummond 27 Mar '15

27 Mar '15

Hello I'm trying to use the function get_rectangles to return a list of rectangles however I can' get the code to compile. code #include <boost/polygon/polygon.hpp> std::vector< boost::polygon::rectangle_data<int> > rects; typedef boost::polygon::polygon_90_with_holes_data<int> Polygon90; Polygon90 poly; typedef boost::polygon::polygon_traits<Polygon90>::point_type MyPoint; MyPoint pts[] = { boost::polygon::construct<MyPoint>(0, 0), boost::polygon::construct<MyPoint>(0, 10), boost::polygon::construct<MyPoint>(30, 10), boost::polygon::construct<MyPoint>(30, 20), boost::polygon::construct<MyPoint>(10, 20), boost::polygon::construct<MyPoint>(10, 0) }; boost::polygon::set_points(poly, pts, pts + 6); boost::polygon::get_rectangles(rects, poly ); which gives the error 1>c:\lib\boost\1.57.0\boost\polygon\detail/rectangle_formation.hpp(261): error C2784: 'boost::rational<IntType> boost::abs(const boost::rational<IntType> &)' : could not deduce template argument for 'const boost::rational<IntType> &' from 'int' 1> C:\lib\boost\1.57.0\boost/rational.hpp(104) : see declaration of 'boost::abs' 1> c:\lib\boost\1.57.0\boost\polygon\polygon_90_set_data.hpp(180) : see reference to function template instantiation 'void boost::polygon::form_rectangles<output_container,std::_Vector_iterator<std::_Vector_val<std::_Simple_types<std::pair<int,std::pair<int,int>>>>>,boost::polygon::rectangle_concept>(output_container &,iterator_type,iterator_type,boost::polygon::orientation_2d,rectangle_concept)' being compiled 1> with 1> [ 1> output_container=std::vector<boost::polygon::rectangle_data<int>,std::allocator<boost::polygon::rectangle_data<int>>> 1> , iterator_type=std::_Vector_iterator<std::_Vector_val<std::_Simple_types<std::pair<int,std::pair<int,int>>>>> 1> , rectangle_concept=boost::polygon::rectangle_concept 1> ] 1> c:\lib\boost\1.57.0\boost\polygon\polygon_90_set_concept.hpp(86) : see reference to function template instantiation 'void boost::polygon::polygon_90_set_data<int>::get_rectangles<output_container_type>(output_container &) const' being compiled 1> with 1> [ 1> output_container_type=std::vector<boost::polygon::rectangle_data<int>,std::allocator<boost::polygon::rectangle_data<int>>> 1> , output_container=std::vector<boost::polygon::rectangle_data<int>,std::allocator<boost::polygon::rectangle_data<int>>> 1> ] 1> c:\lib\boost\1.57.0\boost\polygon\polygon_90_set_concept.hpp(86) : see reference to function template instantiation 'void boost::polygon::polygon_90_set_data<int>::get_rectangles<output_container_type>(output_container &) const' being compiled 1> with 1> [ 1> output_container_type=std::vector<boost::polygon::rectangle_data<int>,std::allocator<boost::polygon::rectangle_data<int>>> 1> , output_container=std::vector<boost::polygon::rectangle_data<int>,std::allocator<boost::polygon::rectangle_data<int>>> 1> ] 1> TerrainDispatcher.cpp(185) : see reference to function template instantiation 'void boost::polygon::get_rectangles<std::vector<boost::polygon::rectangle_data<int>,std::allocator<_Ty>>,Polygon90>(output_container_type &,const polygon_set_type &)' being compiled 1> with 1> [ 1> _Ty=boost::polygon::rectangle_data<int> 1> , output_container_type=std::vector<boost::polygon::rectangle_data<int>,std::allocator<boost::polygon::rectangle_data<int>>> 1> , polygon_set_type=Polygon90 1> ] I'm quite new to both boost and templates so any help would be appreciated. -- View this message in context: http://boost.2283326.n4.nabble.com/problems-using-boost-polygon-get-rectang… Sent from the Boost - Users mailing list archive at Nabble.com.

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[geometry] Buffer multi-linestring with different distances
by Renato Silveira 26 Mar '15

26 Mar '15

Is it possible to buffer a multi-linestring where each linestring has his own distance to buffer? Something like this: http://docs.qgis.org/2.2/en/_images/variable_buffer.png Thank you in advance -- *Renato Silveira* Ph. D. Student Informatics Institute - UFRGS Porto Alegre - RS - Brazil http://www.inf.ufrgs.br/~rsilveira

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[Serialization] serialization of shared_ptr with custom deleter
by Elizabeta 26 Mar '15

26 Mar '15

Hi I am using boost 1.49. There is problem with serialization of shared_ptr with custom deleter, it doesnot preserve the deleter. After deserialization of shared_ptr with custom deleter, when using boost::get_deleter on the deserialized shared_ptr it returns null. Here is code example struct DetachTest { ~DetachTest() { int debug =0; } friend class boost::serialization::access; template<class Archive> inline void serialize(Archive & ar, const unsigned int file_version) { } }; { boost::shared_ptr<DetachTest> ss(new DetachTest,SmartDeleter<DetachTest>()); std::ofstream ofs("C:\\detach.xml"); boost::archive::xml_oarchive oa(ofs); oa & boost::serialization::make_nvp("detach",ss); } { DetachTest* test = 0; boost::shared_ptr<DetachTest> ss (test,SmartDeleter<DetachTest>()); //del is nonnul here SmartDeleter<DetachTest>* del = boost::get_deleter<SmartDeleter<DetachTest> , DetachTest>(ss); std::ifstream ifs("C:\\detach.xml"); boost::archive::xml_iarchive ia(ifs); ia & boost::serialization::make_nvp("detach",ss); //de2 is null after deserialization SmartDeleter<DetachTest>* de2 = boost::get_deleter<SmartDeleter<DetachTest> , DetachTest>(ss); } -- View this message in context: http://boost.2283326.n4.nabble.com/Serialization-serialization-of-shared-pt… Sent from the Boost - Users mailing list archive at Nabble.com.

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Cannot build libboost_mpi.so
by Patrick Begou 25 Mar '15

25 Mar '15

Hi, I'm a new user of boost library, as it is requested by fellpp that I'm trying to install. I'm compiling boost 1.57 with the basic commands: tar xvfz boost_1_57_0.tar.gz cd boost_1_57_0 ./bootstrap.sh --prefix=/share/apps/boost_1_57_0-GCC48 ./b2 But I never get the requested libboost_mpi.so ? Even if the begining of the script tells me: Component configuration: - atomic : building - chrono : building - container : building - context : building - coroutine : building - date_time : building - exception : building - filesystem : building - graph : building - graph_parallel : building - iostreams : building - locale : building - log : building - math : building - mpi : building ...... and libboost_mpi.so is requested for Fellpp.... Thanks for your advices. Patrick -- =================================================================== | Equipe M.O.S.T. | | | Patrick BEGOU | mailto:Patrick.Begou@grenoble-inp.fr | | LEGI | | | BP 53 X | Tel 04 76 82 51 35 | | 38041 GRENOBLE CEDEX | Fax 04 76 82 52 71 | ===================================================================

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Re: [Boost-users] [asio] wrap lambda async_receive call
by Cheng Mo 25 Mar '15

25 Mar '15

Hi Gravin: >The compiler will build the code for a lambda only once regardless of >how many times it's called. But it also won't let you create a >recursive lambda, which is what you would need if you wanted to have a >read operation repeat itself when it completes (which is the most common >case). I supposed that which would be built once durning compiling time but multi time in running time, wasn't it ? It will implement every time when async_xxx be invoded. Although I was not do test for proving that. >Well, actually that's not quite true -- you can type-erase a lambda via >std::function or similar and then call it recursively. But AFAIK you >can only do this when capturing by reference, and you can't safely do >that with a locally declared lambda when making async calls. So it's >not really useful in this context. Private member function or std::function type various and transmitted as reference could be better in this case. >> It's better that build a function object in static. What do you think ? >Function objects have a similar lifetime issue, and making one static is >potentially dangerous if you could have multiple operations or >connections running concurrently. It's usually simplest to use a >private method of the containing class, which is what most of the >example code does. You are right, the static is dangerous in multiple op and concurrence, Thanks. (If you really want to hide it from clients of your class, then use the PIMPL idiom.) Cheer~ 程墨 PBI―北京加维通讯电子技术有限公司地址：北京市海淀区西北旺镇丰智东路3号院邮编：100094 Mail: mcheng(a)pbicn.com

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