August 2005 - Boost-users - lists.preview.boost.org

Re: [Boost-users] Boost-users] boost::date_time GMT/UTC question
by Christopher Hunt 31 Aug '05

31 Aug '05

Sorry about my previous post - I don't know quite what happened but it didn't include the intended response. What I meant to state was that for most applications, UTC and GMT can be regarded as the same. Here's a good explanation on UTC: http://en.wikipedia.org/wiki/Utc Cheers, -C

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Re: [Boost-users] Regex boost 1.33 - (mingw/w32) linking
by Arno Mauhourat 31 Aug '05

31 Aug '05

> Well there's something wrong at your end, because it works for me: > > cd libs/regex/example/grep > g++ -I../../../.. -c -o grep.o grep.cpp > g++ -o grep.exe grep.o > 'C:\data\boost\develop\boost\bin\boost\libs\regex\build\libboost_regex.lib\mingw\debug\threading-multi\libboost_regex-mgw-mt-d-1_33.lib' > 'C:\data\boost\develop\boost\bin\boost\libs\program_options\build\libboost_program_options.lib\mingw\debug\threading-multi\libboost_program_options-mgw-mt-d-1_33.lib' > -g3 > > compiles and links cleanly with the current MinGW release. > > John. > Thanks John, for your time and quick answers. I found the issue: I compiled "grep.cpp" with -O3 and this leads to: - error at linking on debug version of the library (libboost_regex-mgw-mt-d-1_33.lib) - OK linking with non-debug version (libboost_regex-mgw-mt-1_33.lib) I am quite unfamiliar with g++ (and it is quite off topic here) but seems strange to me that an optimization level ruins a linking... Arno

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Re: [Boost-users] Boost::multiIndex container problems
by JOAQUIN LOPEZ MU?Z 31 Aug '05

31 Aug '05

> I tried putting the boost::multi_index::member<> in bare and it > resulted in > the error, regardless of if I hit 'build' or 'rebuild' solution. Weird!! I'd be greateful if you could pursue this a little more. The macro looks like (the second branch is that matters): #if defined(BOOST_NO_POINTER_TO_MEMBER_TEMPLATE_PARAMETERS) #define BOOST_MULTI_INDEX_MEMBER(Class,Type,MemberName) \ ::boost::multi_index::member_offset<Class,Type,offsetof (Class,MemberName)> #else #define BOOST_MULTI_INDEX_MEMBER(Class,Type,MemberName) \ ::boost::multi_index::member<Class,Type,&Class::MemberName> #endif The only difference with the bare member call I can see is the full qualification, with a beginning :: included. Could you see if this makes any difference? Thanks! Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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undefined symbols in the interval library
by Matei Stroila 31 Aug '05

31 Aug '05

Using Visual Studio 7.1 and boost_1_33_0, I am getting the following undefined symbol while trying to run an application that uses the interval_lib: error LNK2019: unresolved external symbol _rint referenced in function "public: static double __cdecl boost::numeric::interval_lib::detail::x86_rounding::to_int(double const &)" (?to_int@x86_rounding@detail@interval_lib@numeric@boost@@SANABN@Z) On the other hand, the same code is compiled and runs fine on my powerbook (gcc and the boost same library version). Thanks for help, Matei

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Seg fault when using serialization library
by Sebastien Gerega 31 Aug '05

31 Aug '05

I am running FC4 with gcc4.0.1 and I installed boost-devel using yum. When I compile with gcc and run the serialization example located at http://www.boost.org/libs/serialization/example/demo.cpp I have no problems. However, the project I am working on requires that I use compatgcc32 for compilation. When I compile with gcc32 and run the same example I get the following output with a seg fault: original schedule 6:24 bob 0x0x8ede5b8 34\uffff135'52.56" 134\uffff22'78.3" 24th Street and 10th Avenue 0x0x8ede5e0 35\uffff137'23.456" 133\uffff35'54.12" State street and Cathedral Vista Lane 0x0x8edeb50 35\uffff136'15.456" 133\uffff32'15.3" White House 9:57 bob 0x0x8ede5b8 34\uffff135'52.56" 134\uffff22'78.3" 24th Street and 10th Avenue 0x0x8ede5e0 35\uffff137'23.456" 133\uffff35'54.12" State street and Cathedral Vista Lane 0x0x8edeb50 35\uffff136'15.456" 133\uffff32'15.3" White House 11:2 alice 0x0x8ede5b8 34\uffff135'52.56" 134\uffff22'78.3" 24th Street and 10th Avenue 0x0x8ede5e0 35\uffff137'23.456" 133\uffff35'54.12" State street and Cathedral Vista Lane 0x0x8edeb50 35\uffff136'15.456" 133\uffff32'15.3" White House 7:17 ted 0x0x8edeb78 35\uffff134'48.789" 133\uffff32'16.23" Lincoln Memorial 0x0x8edeb50 35\uffff136'15.456" 133\uffff32'15.3" White House 0x0x8ede5e0 35\uffff137'23.456" 133\uffff35'54.12" State street and Cathedral Vista Lane 9:38 ted 0x0x8edeb78 35\uffff134'48.789" 133\uffff32'16.23" Lincoln Memorial 0x0x8edeb50 35\uffff136'15.456" 133\uffff32'15.3" White House 0x0x8ede5e0 35\uffff137'23.456" 133\uffff35'54.12" State street and Cathedral Vista Lane 11:47 alice 0x0x8edeb78 35\uffff134'48.789" 133\uffff32'16.23" Lincoln Memorial 0x0x8edeb50 35\uffff136'15.456" 133\uffff32'15.3" White House Segmentation fault I am guessing this is because of different compilers being used or different versions of libstdc++ being required but I am able to compile and run examples using other Boost libraries without problems. Is there any way around this? thanks, Sebastien Gerega

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Re: [Boost-users] Boost-users] boost::date_time GMT/UTC question
by Christopher Hunt 31 Aug '05

31 Aug '05

On 31/08/2005, at 8:07 AM, boost-users-request(a)lists.boost.org wrote: > Simple/quick question: is boost::posix_time::ptime > boost::posix_time::second_clock::universal_time(), which is > described as > UTC in the boost manual page, equal to GMT? If not, what is the > difference between UTC and GMT? > > As I understood it, UTC is the "new" name for GMT, but I'm not sure. * * * Showpiece your Palm device and instantly access world times using our beautiful 3 dimensional globe http://www.classactionpl.com/

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boost::thread state check
by Ovanes Markarian 30 Aug '05

30 Aug '05

Can someone please provide an example how one can test if a started thread is still running or is done? With Kind Regards, Ovanes Markarian

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Re: [Boost-users] Boost::multiIndex container problems
by JOAQUIN LOPEZ MU?Z 30 Aug '05

30 Aug '05

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[statechart] Can events carry data?
by BRIDGES Dick 30 Aug '05

30 Aug '05

Is there any provision for "event-local" storage? I'd like to create events that carry data (e.g., timestamp, source, etc.) to be used by reactions and transitions to update state-local storage. I didn't see anything like this in the documentation. Bad idea? Major drawbacks? If it wouldn't be a problem, how might I go about doing it? Regards, Dick Bridges

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function object wrapper problem
by Okko Willeboordse 30 Aug '05

30 Aug '05

I have a class that has a constructor that takes a Boost function object wrapper; class some_class { public: some_class(const boost::function1<wchar_t*, short*>& some_member) .... I call the constructor with a member function using Boost bind. some_class some_object(boost::bind(&some_other_class::some_member, &some_other_object, _1)); Now I want to use some_class for some_member functions that return an other type pointer. So I do class some_class { public: template <class T> some_class(const boost::function1<T*, short*>& get_member) .... But now the compiler (VS 2003) starts complaining; error C2664: 'some_class::some_class(const some_class &)' : cannot convert parameter 1 from 'boost::_bi::bind_t<R,F,L>' to 'const some_class &' with [ R=wchar_t *, F=boost::_mfi::mf1<wchar_t *,some_other_class,short *>, L=boost::_bi::list2<boost::_bi::list_av_2<some_other_class *__w64 ,boost::arg<1>>::B1,boost::_bi::list_av_2<some_other_class *__w64 ,boost::arg<1>>::B2> ] Reason: cannot convert from 'boost::_bi::bind_t<R,F,L>' to 'const some_class' with [ R=wchar_t *, F=boost::_mfi::mf1<wchar_t *,some_other_class,short *>, L=boost::_bi::list2<boost::_bi::list_av_2<some_other_class *__w64 ,boost::arg<1>>::B1,boost::_bi::list_av_2<some_other_class *__w64 ,boost::arg<1>>::B2> ] No constructor could take the source type, or constructor overload resolution was ambiguous Any ideas? Many thanks, Okko Willeboordse

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