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regex instantiation crashes at program exit
by Gianfranco Zuliani 24 Apr '13

24 Apr '13

Hi, I get a crash when trying to instantiate a boost::regex during program shutdown. I've boiled down the code to this: #include <boost/regex.hpp> #include <boost/thread.hpp> struct Object { ~Object() { boost::regex param("a"); } static Object& Instantiate() { static boost::thread_specific_ptr<Object> theObject; if (theObject.get() == 0) theObject.reset(new Object); return *theObject; } }; int main() { Object::Instantiate(); boost::regex param("a"); return 0; } Program exists fine if I comment out the boost::regex instantiation in main. I'm using Boost v. 1.42, Visual Studio 2008 Pro on Windows 7 SP1 64 bit. Test program is 64 bit too. TIA, Gianfranco

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[TypeTraits] Using has_call
by Robert Jones 24 Apr '13

24 Apr '13

Hi Folks I know has_call is not yet part of Boost, but using the implementation from https://github.com/jamboree/boost.has_call with this code #include "boost/type_traits/has_call.hpp" #include <cassert> template<typename Sig, typename F> bool HasCall(F const&) { return boost::has_call<F, Sig>::value; } void DefaultVal(int) {} int main() { assert(HasCall<boost::dont_care(int)>(DefaultVal)); } fails to compile for me, with a template instantiation ambiguity error. Seems the error is triggered by the use of boost::dont_care. Any ideas? Thx, Rob.

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[FunctionTypes] Testing for a general callable type.
by Robert Jones 24 Apr '13

24 Apr '13

Hi All Is there anything in Boost to help me test for a general type being callable with a specific signature? I've found Boost.FuncionTypes, which seems to be confined to *builtin* callable types, but has made me aware that all the const/volatile/reference variations might make a general test more complicated than I first thought. Any pointers much appreciated. Thx, Rob.

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[units] how to use scaled_base_unit?
by Olaf Peter 24 Apr '13

24 Apr '13

Hi, at this time I start to understand boost.units. Following the doc http://www.boost.org/doc/libs/1_53_0/doc/html/boost_units/Units.html#boost_… scaled_units are useful. But I didn't found use cases in the test or examples. E.g. https://svn.boost.org/svn/boost/trunk/libs/units/test/test_output.cpp show how to typedef this, but no usage. I try to map metric/si and imperial/us length to an intrinsic length using integer scale factors to avoid double representation uncertainly. Using BOOST_UNITS_DEFINE_CONVERSION_FACTOR I can convert meter and inch to the intrinsic length. But what about mm/um and thou/mil etc? For this I did consider scaled_base_unit. I like to convert between all of them. Since the dimensions are constant, no runtime conversation are required (as the dollar/euro example it shows). Later area calculations based on the intrinsic length are required, convertible also to metric/si and imperial systems. Thanks, Olaf

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boost interprocess linking problems under windows
by Jonathon Love 24 Apr '13

24 Apr '13

hi, i'm having difficulty compiling my program which uses boost::interprocess under windows. it compiles successfully under OS X. ./debug\enginesync.o: In function `ZN5boost12interprocess6winapi16co_uninitializerD1Ev': C:/progra~1/boost/boost_1_53_0/boost/interprocess/detail/win32_api.hpp:1651: undefined reference to `_imp__CoUninitialize@0' ./debug\enginesync.o: In function `ZN5boost12interprocess6winapi23get_wmi_class_attributeERSbIwSt11char_traitsIwESaIwEEPKwS8_': C:/progra~1/boost/boost_1_53_0/boost/interprocess/detail/win32_api.hpp:1673: undefined reference to `_imp__CoInitializeEx@8' Makefile.Debug:148: recipe for target '..\JASPDesktop.exe' failed C:/progra~1/boost/boost_1_53_0/boost/interprocess/detail/win32_api.hpp:1690: undefined reference to `_imp__CoInitializeSecurity@36' C:/progra~1/boost/boost_1_53_0/boost/interprocess/detail/win32_api.hpp:1700: undefined reference to `_imp__CoCreateInstance@20' C:/progra~1/boost/boost_1_53_0/boost/interprocess/detail/win32_api.hpp:1731: undefined reference to `_imp__CoSetProxyBlanket@32' C:/progra~1/boost/boost_1_53_0/boost/interprocess/detail/win32_api.hpp:1774: undefined reference to `_imp__VariantClear@4' collect2.exe: error: ld returned 1 exit status mingw32-make[2]: *** [..\JASPDesktop.exe] Error 1 i'm using mingw32 gcc 4.7, boost 1.53, under windows xp 32 bit. any assistance would be appreciated. with thanks

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Cpp_int and cpp_dec_float conversion
by Alessandro Tagliapietra 24 Apr '13

24 Apr '13

Hello, is there a way to convert from cpp_int to cpp_dec_float and viceversa? Since I've to use the modulus between two cpp_dec_float which I know they're integers but I need sqrt before and trying to run % with them gives: /usr/local/include/boost/multiprecision/number.hpp: In member function > ‘void boost::multiprecision::number<Backend, > ExpressionTemplates>::do_assign(const Exp&, const > boost::multiprecision::detail::modulus_immediates&) [with Exp = > boost::multiprecision::detail::expression<boost::multiprecision::detail::modulus_immediates, > boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u, > int, void>, et_on>, > boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u, > int, void>, et_on>, void, void>, Backend = > boost::multiprecision::backends::cpp_dec_float<100u, int, void>, > boost::multiprecision::expression_template_option ExpressionTemplates = > et_on]’: > /usr/local/include/boost/multiprecision/number.hpp:680: instantiated > from ‘void boost::multiprecision::number<Backend, > ExpressionTemplates>::do_assign(const > boost::multiprecision::detail::expression<tag, Arg1, Arg2, Arg3, Arg4>&, > const mpl_::true_&) [with tag = > boost::multiprecision::detail::modulus_immediates, Arg1 = > boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u, > int, void>, et_on>, Arg2 = > boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u, > int, void>, et_on>, Arg3 = void, Arg4 = void, Backend = > boost::multiprecision::backends::cpp_dec_float<100u, int, void>, > boost::multiprecision::expression_template_option ExpressionTemplates = > et_on]’ > /usr/local/include/boost/multiprecision/number.hpp:134: instantiated > from ‘typename boost::enable_if<boost::is_convertible<typename > boost::multiprecision::detail::expression<tag, Arg1, Arg2, Arg3, > Arg4>::result_type, boost::multiprecision::number<Backend, > ExpressionTemplates> >, boost::multiprecision::number<Backend, > ExpressionTemplates>&>::type boost::multiprecision::number<Backend, > ExpressionTemplates>::operator=(const > boost::multiprecision::detail::expression<tag, Arg1, Arg2, Arg3, Arg4>&) > [with tag = boost::multiprecision::detail::modulus_immediates, Arg1 = > boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u, > int, void>, et_on>, Arg2 = > boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u, > int, void>, et_on>, Arg3 = void, Arg4 = void, Backend = > boost::multiprecision::backends::cpp_dec_float<100u, int, void>, > boost::multiprecision::expression_template_option ExpressionTemplates = > et_on]’ > /usr/local/include/boost/multiprecision/number.hpp:181: instantiated > from ‘boost::multiprecision::number<Backend, > ExpressionTemplates>::number(const > boost::multiprecision::detail::expression<tag, Arg1, Arg2, Arg3, Arg4>&, > typename boost::enable_if_c<boost::is_convertible<typename > boost::multiprecision::detail::expression<tag, Arg1, Arg2, Arg3, > Arg4>::result_type,boost::multiprecision::number<Backend, > ExpressionTemplates> >::value, void>::type*) [with tag = > boost::multiprecision::detail::modulus_immediates, Arg1 = > boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u, > int, void>, et_on>, Arg2 = > boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u, > int, void>, et_on>, Arg3 = void, Arg4 = void, Backend = > boost::multiprecision::backends::cpp_dec_float<100u, int, void>, > boost::multiprecision::expression_template_option ExpressionTemplates = > et_on]’ > test.cpp:20: instantiated from here > /usr/local/include/boost/multiprecision/number.hpp:912: error: invalid > application of ‘sizeof’ to incomplete type > ‘boost::STATIC_ASSERTION_FAILURE<false>’ Thanks in advance Best Regards

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HOWTO: Connect Boost Signals & Slots to Qt Signals & Slots
by John Adamson 24 Apr '13

24 Apr '13

Hello everyone, Please find the first in a series of articles here: http://www.oxforddynamics.com/articles/connect_qt_and_boost_signals_and_slo… I hope it will be of use! Moderators: is this type of post is acceptable or not? Please let me know if it isn't and I won't post Boost related HOWTOs here again. Kind Regards, John

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message_queue and libvevent
by Francesco "kurojishi" Berni 23 Apr '13

23 Apr '13

hi, i'm trying to use the boost::interprocess::message_queue class in an event driven software that use for a great part sockets and libevent for the event loop. normally for monitoring of events in this software we use the file descriptor of the PF_UNIX sockets. now, i'm trying to understand if the message_queue generate signals or other events when useing the blocking methods and if there is something i can feed to the event_new() function of libevent. i didn't find anything that give me this information in the doc: http://www.boost.org/doc/libs/1_53_0/doc/html/interprocess/synchronization_… thankss -- Francesco Berni - kurojishi Registered Linux User #512920 GPG: A1FB5252

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[Xpressive] Problem with more than 49 named captures
by michael.donnerer＠googlemail.com 23 Apr '13

23 Apr '13

Hi all, I am having trouble getting more than 49 named captures to work with boost xpressive 1.49.0. I extended the default mark_tag like so: boost::xpressive::mark_tag s10(10); boost::xpressive::mark_tag s11(11); boost::xpressive::mark_tag s12(12); … boost::xpressive::mark_tag s48(48); boost::xpressive::mark_tag s49(49); together with a regular expression that uses these named captures: (skip rather long expression)… (s49= +(boost::xpressive::set[boost::xpressive::range('0','9')|'-'])) This works as long as I stick to only using up to s49, as soon as I start using s50 the regular expression no longer seems to match. Is there anything obvious I am missing before I start digging deeper? Thanks, Mike

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[REVIEW] Boost.Predef
by Joel Falcou 23 Apr '13

23 Apr '13

Hi all, first, I want to apologize for the delay in getting this review results out. Looks like my last email get lost at some point. Anyway, after the initial review of Rene Riviera Boost.Predef, my decision was to Conditionnally Accept Boost.Predef under the request that the comments raised during the review period were addressed. Since then, Rene worked hard on actually making those changes so I now feel confident to announce that Boost.Predef is ACCEPTED as a Boost library. Regards

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