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Re: [Boost-users] static reflection
by James Pritts 18 Sep '08

18 Sep '08

Sorry for top posting here, but I didn't receive Steven's response. I'm using i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5488). The compile error I get is the following: g++ -I/Users/jpritts/trunk/LIFEBLAST_HOME/i386-darwin-gcc-4_0/vendor/Boost/include main.cc -o a.out main.cc: In instantiation of 'DoesVisitorImplement<Derived, void, float>': main.cc:47: instantiated from here main.cc:22: error: '&Base::operator()' is not a valid template argument for type 'void (Derived::*)(float)' because it is of type 'void (Base::*)(float)' main.cc:22: note: standard conversions are not allowed in this context Thanks, Jimmy. AMDG James Pritts wrote: > On a boost thread a while ago, I saw some code to query for the > existence of a member function of a class using SFINAE and > BOOST_STATIC. I guess you could call it static reflection. Below is > a code snippet that does not work using the aforementioned methods. > The culprit is the using Base::operator() statement in the Derived > class. Apparently the base class method void operator()(float u) is > not part of the type of Derived. This was a shock to me, because you > can call the overloaded method from the derived class. I'd appreciate > any advice on how to check for the existence of member functions in > this scenario. I fear it may be impossible. Thanks! > You can convert a member function pointer of a derived class to a member function pointer of a derived class, so it ought to work. What compiler are you using? I get 1 1 Using msvc 9.0. In Christ, Steven Watanabe

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Which version?
by Robert Jones 18 Sep '08

18 Sep '08

I've found a boost distribution in the build at work. How can I determine which release it is? - Rob.

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is it safe to upgrade from 1.35 to 1.36?
by frederic.bron＠alcan.com 18 Sep '08

18 Sep '08

Since 1.36 is out, I have seen so many messages concerning troubles with 1.36 that I did not dare to upgrade. What is the status of 1.36? Regards F. Bron Avis : Ce message et toute pièce jointe sont la propriété d'Alcan et sont destinés seulement aux personnes ou à l'entité à qui le message est adressé. Si vous avez reçu ce message par erreur, veuillez le détruire et en aviser l'expéditeur par courriel. Si vous n'êtes pas le destinataire du message, vous n'êtes pas autorisé à utiliser, à copier ou à divulguer le contenu du message ou ses pièces jointes en tout ou en partie. Notice: This message and any attachments are the property of Alcan and are intended solely for the named recipients or entity to whom this message is addressed. If you have received this message in error please inform the sender via e-mail and destroy the message. If you are not the intended recipient you are not allowed to use, copy or disclose the contents or attachments in whole or in part.

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[program_options] Problem using value<string>()->zero_tokens() with config file
by Marcio Paim de Aquino 18 Sep '08

18 Sep '08

Hi, I have the following code section: po::options_description config; config.add_options() ( "HOST", po::value<string>(&host) ) ( "USER", po::value<string>(&user) ) ( "PASSWD", po::value<string>(&passwd) ) ( "DATABASE", po::value<string>(&database) ) ( "PORT", po::value<int>(&port) ) ( "VERTEX.WEIGHT", po::value<string>()->zero_tokens() ); po::variables_map vm; ifstream ifs( "myfile.conf" ); store( parse_config_file( ifs, config ), vm ); notify( vm ); If in myfile.conf I leave WEIGHT blank like this [VERTEX] WEIGHT = I get the following error message: terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::program_options::invalid_syntax> >' what(): no value given in 'WEIGHT =' Aborted Someone can tell whats is wrong? Thanks Marcio

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Re: [Boost-users] dynamic link error: boost::program_options::arg not found (Sebastian Hauer)
by Vial, Florent 18 Sep '08

18 Sep '08

Hi Sebastian and Ovanes, I am facing the same problems as you with linking to boost::program_options, and boost::system too. In all my win32 projects (I use msvc9.0), I define BOOST_DYN_LIB using a common property sheet. It compiles just fine with 1.36.0 but it does not link. I also specify BOOST_LIB_DIAGNOSTIC so that I can see what boost auto link is trying to do. May be I should say that I built my boost 1.36.0 libraries on Win32 (Windows XP Professional SP3) using following command line: ./bjam.exe toolset=msvc --build-type=complete --build-dir="D:\tmp" --threading=multi --runtime-link=static,shared --prefix="C:\boost1.36" install --without-mpi --without-python --without-wave When I compile my project (some libraries using boost_filesystem and boost_system, some not), I can see in the compiler output: Linking to lib file: boost_filesystem-vc90-mt-1_36.lib Linking to lib file: boost_system-vc90-mt-1_36.lib When I compile my main : #include <iostream> #include <boost/program_options.hpp> namespace po = boost::program_options; int main(int argc, char **argv) { int ret = 0; po::variables_map vm; po::options_description all("Allowed options"); try { po::options_description general("General options"); general.add_options() ("help,h", "Show this message and exit.") ("version,v", "Output version information and exit."); po::options_description optional("Optional options"); optional.add_options() ("optional,o", po::value<std::string>(), "Optional") ("optional2,p", po::value<std::string>(), "Optional2"); all.add(general).add(optional); po::store(po::parse_command_line(argc, argv, all), vm); po::notify(vm); } catch (const po::invalid_command_line_syntax &badsyntax) { /* My log error with badsyntax*/ ret = -1; } catch (const po::unknown_option &badoption) { /* My log error with badoption*/ ret = -2; } catch (const po::error &err) { /* My log error with err*/ ret = -3; } if (vm.count("optional")) { std::string optionalParam = vm["optional"].as<std::string>(); /** Handling optionalParam ... */ } if (vm.count("optional2")) { std::string optionalParam2 = vm["optional2"].as<std::string>(); /** Handling optionalParam2 ... */ } if (vm.count("help")) { std::cout << all << std::endl; return 0; } return ret; } with following command line: /O2 /Ob2 /Oy /I all-my-includes-here /I "../../../../boost/include/boost-1_36" /D "BOOST_PROGRAM_OPTIONS_DYN_LINK" /D "UNICODE" /D "NDEBUG" /D "BOOST_LIB_DIAGNOSTIC" /D "BOOST_SYSTEM_DYN_LINK" /D "BOOST_FILESYSTEM_DYN_LINK" /D "BOOST_THREAD_DYN_LINK" /D "NOMINMAX" /D "WIN32_LEAN_AND_MEAN" /D "WIN32" /D "_WINDOWS" /D "_CRT_NONSTDC_NO_WARNINGS" /D "_CRT_SECURE_NO_WARNINGS" /D "_CRT_SECURE_NO_DEPRECATE" /D "_CRT_NONSTDC_NO_DEPRECATE" /FD /EHsc /MD /GS- /arch:SSE2 /Fo"./../../Release/MyApp/" /Fd"./../../Release/MyApp/vc90.pdb" /W3 /nologo /c /TP /wd4100 /wd4290 /errorReport:prompt -EHsc -Zm200 -w34100 -w34189 -w34189 I can see in the compiler output following lines: Linking to lib file: boost_program_options-vc90-mt-1_36.lib ../../../../boost/include/boost-1_36\boost/program_options/errors.hpp(21) : warning C4275: non dll-interface class 'std::logic_error' used as base for dll-interface class 'boost::program_options::error' > C:\Programme\MicrosoftVisualStudio9.0\VC\include\stdexcept(21) : see declaration of 'std::logic_error' > ../../../../boost/include/boost-1_36\boost/program_options/errors.hpp(21) : see declaration of 'boost::program_options::error' >../../../../boost/include/boost-1_36\boost/program_options/errors.hpp(61) : warning C4251: 'boost::program_options::ambiguous_option::alternatives' : class 'std::vector<_Ty>' needs to have dll-interface to be used by clients of class 'boost::program_options::ambiguous_option' > with > [ > _Ty=std::string > ] [snip a lot of similar warnings] Then, linking with following command line /OUT:"../../Release\MyApp.exe" /INCREMENTAL /NOLOGO /LIBPATH:"../../Release" /LIBPATH:"..\..\..\..\boost/lib/vc90" /MANIFEST /MANIFESTFILE:"../../Release/MyApp\MyApp.exe.intermediate.manifest" /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /NODEFAULTLIB:"libcpmt.lib" /NODEFAULTLIB:"libcmt.lib" /SUBSYSTEM:CONSOLE /DYNAMICBASE:NO /MACHINE:X86 /ERRORREPORT:PROMPT msvcrt.lib msvcprt.LIB binmode.obj kernel32.lib user32.lib netapi32.lib Iphlpapi.lib Ws2_32.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib I get following errors: Memain.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall boost::program_options::detail::cmdline::set_additional_parser(class boost::function1<struct std::pair<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &>)" (__imp_?set_additional_parser@cmdline@detail@program_options@boost@@QAEXV?$function1@U?$pair@V?$basic_string@DU?$char_traits@D@std@@V?$alloc ator@D@2@@std@@V12@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@4@@Z) referenced in function "public: class boost::program_options::basic_command_line_parser<char> & __thiscall boost::program_options::basic_command_line_parser<char>::extra_parser(class boost::function1<struct std::pair<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &>)" (?extra_parser@?$basic_command_line_parser@D@program_options@boost@@QAEAAV123@V?$function1@U?$pair@V?$basic_string@DU?$char_traits@D@std@@V? $allocator@D@2@@std@@V12@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@3@@Z) 1>metiscalibrationdata.lib(MetisMatrixCalibration_io.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::get_generic_category(void)" (?get_generic_category@system@boost@@YAABVerror_category@12@XZ) referenced in function "void __cdecl boost::system::`dynamic initializer for 'generic_category''(void)" (??__Egeneric_category@system@boost@@YAXXZ) error LNK2019: unresolved external symbol "__declspec(dllimport) class boost::system::error_category const & __cdecl boost::system::get_generic_category(void)" (__imp_?get_generic_category@system@boost@@YAABVerror_category@12@XZ) referenced in function "void __cdecl boost::system::`dynamic initializer for 'generic_category''(void)" (??__Egeneric_category@system@boost@@YAXXZ) 1>filesystem.lib(FileUtils.obj) : error LNK2001: unresolved external symbol "__declspec(dllimport) class boost::system::error_category const & __cdecl boost::system::get_generic_category(void)" (__imp_?get_generic_category@system@boost@@YAABVerror_category@12@XZ) 1>filesystem.lib(FileUtils.obj) : error LNK2019: unresolved external symbol "__declspec(dllimport) class boost::system::error_code boost::filesystem::detail::throws" (__imp_?throws@detail@filesystem@boost@@3Verror_code@system@3@A) referenced in function "void __cdecl boost::filesystem::remove<class boost::filesystem::basic_path<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,struct boost::filesystem::path_traits> >(class boost::filesystem::basic_path<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,struct boost::filesystem::path_traits> const &,class boost::system::error_code &)" (??$remove@V?$basic_path@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@Upath_traits@filesystem@boost@@@filesystem@boost@@@fi lesystem@boost@@YAXABV?$basic_path@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@Upath_traits@filesystem@boost@@@01@AAVerror _code@system@1@@Z) When I open boost\include\boost-1_36\boost\program_options\detail\cmdline.hpp I can see BOOST_PROGRAM_OPTIONS_DECL declared as __declspec(dllimport) when compiling my application. When I open boost\include\boost-1_36\boost\system\error_code.hpp, I can see BOOST_SYSTEM_DECL declared as __declspec(dllimport) as well. So my question (at last!) is: how can I check if those symbols were properly exported when building boost ? thank you, Cheers, Florent ---------------------------------------------------------------------- Message: 1 Date: Wed, 17 Sep 2008 13:21:41 -0400 From: "Sebastian Hauer" <sebastian.hauer(a)gmail.com> Subject: Re: [Boost-users] dynamic link error: boost::program_options::arg not found To: boost-users(a)lists.boost.org Message-ID: <fb92d9f00809171021k8c0cf93i75f67b9564281852(a)mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Hello Ovanes, thanks for the reply. I fixed it. I eventually found your posting and tried your suggestion attributing boost::program_options::arg with an additional __declspec(selectany) but either I did something wrong or things are different with msvc-8.0 it did not work for me. Instead I went down a different path and got rid of the global arg variable altogether. Since nothing seems to write into it and the value is always copied it seemed like a reasonable thing to do considering it causes so much grief with the linking. Once this was fixed I got another linker error: error LNK2001: unresolved external symbol "public: static unsigned int const boost::program_options::options_description::m_default_line_length" (?m_default_line_length@options_description@program_options@boost@@2IB) I found the solution to that one from this posting from Evert at http://archives.free.net.ph/message/20080815.085344.d72efb54.en.html . Once I changed the declaration of the class static const m_default_line_length to: BOOST_STATIC_CONSTANT (unsigned, m_default_line_length = 80); With these two changes in place all compiled and linked without a problem. Below I've inlined the patch of my changes against the original boost_1_36_0 source as reference for other people running into this issue. If these changes seem like a good idea to others perhaps they could be included with the next boost release. Regards, Sebastian

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boost::multi_index help
by Axel 18 Sep '08

18 Sep '08

I'm trying to use multi_index to store objects pointers. These objects have mainly 3 fields : - string name - int id - int block_id name & id are unique among all instances, but block_id can be the same for many instances. I want to distribute the object instances among a few blocks, so many instances can have block_id 0, many others block_id 1, and so on. (there are 6 blocks for the moment) here is my struct : /* tags */ struct name_{} ; struct id_{} ; struct block_id_{} ; typedef hashed_unique< tag<name_>, boost::multi_index::mem_fun<Foo, string, &Foo::getName> > NameIndex ; typedef ordered_unique< tag<id_>, boost::multi_index::mem_fun<Foo, int, &Foo::getId> > IdIndex ; typedef ordered_non_unique< tag<block_id_>, boost::multi_index::mem_fun<Foo, int, &Foo::getBlockId> > BlockIndex ; typedef multi_index_container<Foo*, indexed_by<NameIndex, IdIndex, BlockIndex> > FooList ; The name & id indexes work well but I dont manage to get the Foo* pointers for a given block_id. I m using : foo_list_.get<block_id_>().find(1) to grab the wanted list. My problem is that in the result I have not only Foo instances from the block 1. This is what I get when I try to query for a given block_id : For block 5 : only objects with block_id == 5 For block 4 : objects with block_id == 4 and 5 For block 3 : objects with block_id == 3, 4 and 5 For block 2 : objects with block_id == 2, 3, 4 and 5 and so on. I d like to get only the objects with block_id = 4 when I query the multi_index object on its block_id index. I now wonder if what I want to do can be done with multi_index. Thanks in advance for your help

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Cross-Compile Boost for Embedded Linux
by Richard Ketcham 18 Sep '08

18 Sep '08

Hi everyone, Here is my question: what do I have to do to cross-compile boost with this compiler? Right now, the libraries and files associated with threading are the most important to me. I am starting to work with boost at the behest of a coworker. My goal is to get boost compiled for an embedded linux environment. My current setup includes my desktop running Ubuntu which also hosts the buildroot for the embedded linux environment. I have downloaded boost_1_36_0.tar.bz2 and have extracted it to /usr/local/boost_1_36_0/. For the sake of simplicity, let's say that the compiler for the embedded linux environment resides at .../staging_dir/bin/arm-linux-gcc-4.1.1 Thanks in advance for your help. Rich -- There is nothing more practical than a good theory. James Maxwell

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static reflection
by James Pritts 18 Sep '08

18 Sep '08

On a boost thread a while ago, I saw some code to query for the existence of a member function of a class using SFINAE and BOOST_STATIC. I guess you could call it static reflection. Below is a code snippet that does not work using the aforementioned methods. The culprit is the using Base::operator() statement in the Derived class. Apparently the base class method void operator()(float u) is not part of the type of Derived. This was a shock to me, because you can call the overloaded method from the derived class. I'd appreciate any advice on how to check for the existence of member functions in this scenario. I fear it may be impossible. Thanks! #include <iostream> #include <boost/shared_ptr.hpp> typedef char (&no_tag)[1]; typedef char (&yes_tag)[2]; template <typename Class, typename R, typename Arg1, R(Class::*)(Arg1)> struct HasExactSignature { }; template<typename Class, typename R, typename Arg1> no_tag doesVisitorImplementHelper(...); template<typename Class, typename R, typename Arg1> yes_tag doesVisitorImplementHelper(HasExactSignature<Class, R, Arg1, &Class::operator()>* p=0); template<typename Class, typename R, typename Arg1> struct DoesVisitorImplement { BOOST_STATIC_CONSTANT(bool, value = sizeof(doesVisitorImplementHelper<Class,R,Arg1>(0)) == sizeof(yes_tag)); }; struct Base { void operator()(float u) { std::cout << "aaaa"; } }; struct Derived : public Base { using Base::operator(); void operator()(int u) { std::cout << "bbbb"; } }; int main() { std::cout << DoesVisitorImplement<Derived,void,int>::value << std::endl; std::cout << DoesVisitorImplement<Derived,void,float>::value << std::endl; return 0; }

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dynamic link error: boost::program_options::arg not found
by Sebastian Hauer 17 Sep '08

17 Sep '08

Hi, I am trying to dynamically link one of my *libraries* to boost program_options on windows with msvc-8.0 but linking fails due to a missing symbol. Quickly googling for this problem revealed no resolution to my problem, although it appears other people ran into this issue before. Did anyone resolve it or is everyone linking boost program_options statically? I initially ran into this issue on boost 1_34_1 but have since upgraded to 1_36 hoping it would have gotten fixed with no luck. error LNK2001: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > boost::program_options::arg" (?arg@program_options@boost@@3V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@A) Here is the link command line: link /NOLOGO /INCREMENTAL:NO /DLL /DEBUG /subsystem:console /out:"foo.dll" /IMPLIB:"foo.lib" /LIBPATH:"..\boost_1_36_0\lib.x86-nt-msvc8" @"foo.dll.rsp" And foo.dll.rsp contains besides the name of my object files also references to the following external import libraries: "boost_date_time-vc80-mt-gd-1_36.lib" "boost_filesystem-vc80-mt-gd-1_36.lib" "boost_program_options-vc80-mt-gd-1_36.lib" "boost_system-vc80-mt-gd-1_36.lib" Thanks, Sebastian

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Is there a parameter to build without compiler version info in the target library name?
by Bill David 17 Sep '08

17 Sep '08

By default, the compiled library have a name like: libboost_thread-gcc41-mt.a but I don't want the gcc41 information in the name as I may need modify my makefile to switch to another environment with gcc4.3. So is there a parameter in bjam to suppress the compiler version info in target library name? Or how will you solve this kind of problem?

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