- Boost - lists.boost.org

std::string <-> std::wstring conversion
by Mihalca Bobby 21 Apr '05

21 Apr '05

Hi. I needed some std::string <-> std::wstring conversion and after searching web for something like this found nothing except a thread with this name here on boost. So I made one myself, maybe if you think is worth something you will include it in boost. Here is the code: template<class _RetString,class _SourceString> _RetString string_cast(const _SourceString &src,std::locale Loc=std::locale()) { _RetString dst; typedef _SourceString::value_type _SrcValType; typedef _RetString::value_type _DstValType; typedef std::codecvt<_SrcValType,_DstValType,mbstate_t> CodeCvt; const CodeCvt & cvt= use_facet<CodeCvt>(Loc); std::mbstate_t state = std::mbstate_t(); _SrcValType * next_in=NULL; _DstValType *next_out=NULL; dst.resize(src.size()); while(true) { switch(cvt.out(state, src.c_str(), src.c_str() + src.size(),next_in,const_cast<_DstValType *>(dst.c_str()),const_cast<_DstValType *>(dst.c_str())+dst.size(), next_out)) { case std::codecvt_base::ok: case std::codecvt_base::partial: case std::codecvt_base::error: // not much we can do here but guess: case std::codecvt_base::noconv: return dst; } } return dst; } and I used like this: std::string strA = string_cast<std::string>( std::wstring(L"dummy example") ); Bobby __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

2 1

Re: [boost] Re: [circular_buffer] comparison operators
by Jan Gaspar 20 Apr '05

20 Apr '05

Hi Fredrik, I'm attaching the discussion during the formal review regarding the comparison operators. But before you dip into the reading, I'd like to say that my intension was to write STL compliant container nothing less or more and I'd like to stick with this. Jan Subject: RE: [boost] Formal Review: Circular Buffer Date: Tue, 9 Mar 2004 09:44:34 -0800 From: "Powell, Gary" <powellg(a)amazon.com> To: boost(a)lists.boost.org Shouldn't the comparison functions allow the types to differ? I mean don't they still lexigraphically compare as long as there is a comparison function F that a F b for each element exists circular_buffer<T, MyAlloc> x; circular_buffer<S, YourAlloc> y; bool b = x == y; for where the operator T == S is valid? And what does the allocator have to do with it? Therefore IMO, all of the comparison functions should change from template< typename T, typename Alloc> bool operator F ( circular_buffer<T, Alloc> &lhs, circular_buffer<T, Alloc> &rhs); to template< typename T1, typename Alloc1, typename T2, typename Alloc2> bool operator F ( circular_buffer<T1, Alloc1> &lhs, circular_buffer<T2, Alloc2> &rhs); Yours, -Gary- ----------------------------------------------- To: boost(a)lists.boost.org From: "Pavel Vozenilek" <pavel_vozenilek(a)hotmail.com> Date: Tue, 9 Mar 2004 20:52:29 +0100 Subject: [boost] Re: Formal Review: Circular Buffer Hmm, do you know a STL implementation/some container with this feature? It may be often bug to compare containers with different types. /Pavel ----------------------------------------------------- Subject: RE: [boost] Re: Formal Review: Circular Buffer Date: Tue, 9 Mar 2004 13:55:15 -0800 From: "Powell, Gary" <powellg(a)amazon.com> To: boost(a)lists.boost.org No, but just because the standard libraries scr*wed up is no reason to perpetuate the mistake. It's the rule of unexpected consequences. Is circular_buffer<int> x = { 1, 2, 3}; circular_buffer<short> y = { 1, 2 ,3}; x == y ?? or not? Sure looks like it should work. The VTL library does it IMO correctly, allowing that if there is an operation T1 F T2, then V1 F V2 compiles. Otherwise you just force the user to write what should be library code. --------------------------------------------- Send instant messages to your online friends http://uk.messenger.yahoo.com

2 1

boost 1_32_0 with STLPort 5.0RC2
by Manish Mangal 20 Apr '05

20 Apr '05

I am trying to create boost libs with STLPort 5.0RC2. I get the following errors: ...found 10018 targets... ...updating 20 targets... vc-Link bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\debug\th reading-multi\boost_filesystem-vc71-mt-gdp-1_32.dll bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\debug\th reading-multi\boost_filesystem-vc71-mt-gdp-1_32.lib Creating library bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\debug\th reading-multi\boost_filesystem-vc71-mt-gdp-1_32.lib and object bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\debug\th reading-multi\boost_filesystem-vc71-mt-gdp-1_32.exp exception.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_destroy_ptr_range(char *,char *)" (__imp_?_M_destroy_ptr_range@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAE XPAD0@Z) referenced in function $L79050 path_posix_windows.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_destroy_ptr_range(char *,char *)" (__imp_?_M_destroy_ptr_range@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAE XPAD0@Z) exception.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: bool __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_using_static_buf(void)const " (__imp_?_M_using_static_buf@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IBE_ NXZ) referenced in function $L79050 path_posix_windows.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) protected: bool __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_using_static_buf(void)const " (__imp_?_M_using_static_buf@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IBE_ NXZ) exception.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_reset(char *,char *,char *)" (__imp_?_M_reset@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEXPAD00@Z) referenced in function $L79050 path_posix_windows.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_reset(char *,char *,char *)" (__imp_?_M_reset@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEXPAD00@Z) exception.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_deallocate_block(void)" (__imp_?_M_deallocate_block@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEX XZ) referenced in function $L79050 path_posix_windows.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_deallocate_block(void)" (__imp_?_M_deallocate_block@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEX XZ) exception.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_destroy_range(unsigned int,unsigned int)" (__imp_?_M_destroy_range@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEXII@ Z) referenced in function $L79050 path_posix_windows.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_destroy_range(unsigned int,unsigned int)" (__imp_?_M_destroy_range@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEXII@ Z) exception.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) private: void __thiscall _STL::_Nondebug_string<char,class _STL::char_traits<char>,class _STL::allocator<char> >::_M_construct_null(char *)const " (__imp_?_M_construct_null@?$_Nondebug_string@DV?$char_traits@D@_STL@@V?$allo cator@D@2@@_STL@@ABEXPAD@Z) referenced in function "private: class _STL::_Nondebug_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > & __thiscall _STL::_Nondebug_string<char,class _STL::char_traits<char>,class _STL::allocator<char> >::_M_append<char const *>(char const *,char const *,struct _STL::forward_iterator_tag const &)" (??$_M_append@PBD@?$_Nondebug_string@DV?$char_traits@D@_STL@@V?$allocator@D@ 2@@_STL@@AAEAAV01@PBD0ABUforward_iterator_tag@1@@Z) path_posix_windows.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) private: void __thiscall _STL::_Nondebug_string<char,class _STL::char_traits<char>,class _STL::allocator<char> >::_M_construct_null(char *)const " (__imp_?_M_construct_null@?$_Nondebug_string@DV?$char_traits@D@_STL@@V?$allo cator@D@2@@_STL@@ABEXPAD@Z) exception.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: char * __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_Start(void)" (__imp_?_M_Start@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEPADXZ) referenced in function "private: class _STL::_Nondebug_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > & __thiscall _STL::_Nondebug_string<char,class _STL::char_traits<char>,class _STL::allocator<char> >::_M_append<char const *>(char const *,char const *,struct _STL::forward_iterator_tag const &)" (??$_M_append@PBD@?$_Nondebug_string@DV?$char_traits@D@_STL@@V?$allocator@D@ 2@@_STL@@AAEAAV01@PBD0ABUforward_iterator_tag@1@@Z) path_posix_windows.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) protected: char * __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_Start(void)" (__imp_?_M_Start@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEPADXZ) exception.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: char * __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_Finish(void)" (__imp_?_M_Finish@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEPADXZ) referenced in function "private: class _STL::_Nondebug_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > & __thiscall _STL::_Nondebug_string<char,class _STL::char_traits<char>,class _STL::allocator<char> >::_M_append<char const *>(char const *,char const *,struct _STL::forward_iterator_tag const &)" (??$_M_append@PBD@?$_Nondebug_string@DV?$char_traits@D@_STL@@V?$allocator@D@ 2@@_STL@@AAEAAV01@PBD0ABUforward_iterator_tag@1@@Z) path_posix_windows.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) protected: char * __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_Finish(void)" (__imp_?_M_Finish@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEPADXZ) exception.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_throw_length_error(void)const " (__imp_?_M_throw_length_error@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IB EXXZ) referenced in function "private: class _STL::_Nondebug_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > & __thiscall _STL::_Nondebug_string<char,class _STL::char_traits<char>,class _STL::allocator<char> >::_M_append<char const *>(char const *,char const *,struct _STL::forward_iterator_tag const &)" (??$_M_append@PBD@?$_Nondebug_string@DV?$char_traits@D@_STL@@V?$allocator@D@ 2@@_STL@@AAEAAV01@PBD0ABUforward_iterator_tag@1@@Z) path_posix_windows.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_throw_length_error(void)const " (__imp_?_M_throw_length_error@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IB EXXZ) bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\debug\th reading-multi\boost_filesystem-vc71-mt-gdp-1_32.dll : fatal error LNK1120: 9 unresolved externals CALL "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\VCVARS32.BAT" >nul "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\link" /nologo /INCREMENTAL:NO /DEBUG /DLL /subsystem:console /out:"bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\de bug\threading-multi\boost_filesystem-vc71-mt-gdp-1_32.dll" /IMPLIB:"bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport \debug\threading-multi\boost_filesystem-vc71-mt-gdp-1_32.lib" /LIBPATH:"C:\SourceLibrary\STLport\STLport-4.6.2\lib" "stlport_vc71_stldebug.lib" @"bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\debug\ threading-multi\boost_filesystem-vc71-mt-gdp-1_32.CMD" ...failed vc-Link bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\debug\th reading-multi\boost_filesystem-vc71-mt-gdp-1_32.dll bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\debug\th reading-multi\boost_filesystem-vc71-mt-gdp-1_32.lib... ...skipped <@boost!lib>boost_filesystem-vc71-mt-gdp-1_32.dll for lack of <@boost!libs!filesystem!build\boost_filesystem.dll\vc-7_1-stlport\debug\thre ading-multi>boost_filesystem-vc71-mt-gdp-1_32.dll... ...skipped <@boost!lib>boost_filesystem-vc71-mt-gdp-1_32.lib for lack of <@boost!libs!filesystem!build\boost_filesystem.dll\vc-7_1-stlport\debug\thre ading-multi>boost_filesystem-vc71-mt-gdp-1_32.lib... vc-Link bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\release\ threading-multi\boost_filesystem-vc71-mt-p-1_32.dll bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\release\ threading-multi\boost_filesystem-vc71-mt-p-1_32.lib Creating library bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\release\ threading-multi\boost_filesystem-vc71-mt-p-1_32.lib and object bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\release\ threading-multi\boost_filesystem-vc71-mt-p-1_32.exp exception.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_deallocate_block(void)" (__imp_?_M_deallocate_block@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEX XZ) referenced in function "private: class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > & __thiscall _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> >::_M_append<char const *>(char const *,char const *,struct _STL::forward_iterator_tag const &)" (??$_M_append@PBD@?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@_ STL@@AAEAAV01@PBD0ABUforward_iterator_tag@1@@Z) path_posix_windows.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_deallocate_block(void)" (__imp_?_M_deallocate_block@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEX XZ) exception.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_destroy_range(unsigned int,unsigned int)" (__imp_?_M_destroy_range@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEXII@ Z) referenced in function "private: class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > & __thiscall _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> >::_M_append<char const *>(char const *,char const *,struct _STL::forward_iterator_tag const &)" (??$_M_append@PBD@?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@_ STL@@AAEAAV01@PBD0ABUforward_iterator_tag@1@@Z) path_posix_windows.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_destroy_range(unsigned int,unsigned int)" (__imp_?_M_destroy_range@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IAEXII@ Z) exception.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_throw_length_error(void)const " (__imp_?_M_throw_length_error@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IB EXXZ) referenced in function "private: class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > & __thiscall _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> >::_M_append<char const *>(char const *,char const *,struct _STL::forward_iterator_tag const &)" (??$_M_append@PBD@?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@_ STL@@AAEAAV01@PBD0ABUforward_iterator_tag@1@@Z) path_posix_windows.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) protected: void __thiscall _STL::_String_base<char,class _STL::allocator<char> >::_M_throw_length_error(void)const " (__imp_?_M_throw_length_error@?$_String_base@DV?$allocator@D@_STL@@@_STL@@IB EXXZ) bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\release\ threading-multi\boost_filesystem-vc71-mt-p-1_32.dll : fatal error LNK1120: 3 unresolved externals CALL "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\VCVARS32.BAT" >nul "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\link" /nologo /INCREMENTAL:NO /DLL /subsystem:console /out:"bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\re lease\threading-multi\boost_filesystem-vc71-mt-p-1_32.dll" /IMPLIB:"bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport \release\threading-multi\boost_filesystem-vc71-mt-p-1_32.lib" /LIBPATH:"C:\SourceLibrary\STLport\STLport-4.6.2\lib" "stlport_vc71.lib" @"bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\releas e\threading-multi\boost_filesystem-vc71-mt-p-1_32.CMD" ...failed vc-Link bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\release\ threading-multi\boost_filesystem-vc71-mt-p-1_32.dll bin\boost\libs\filesystem\build\boost_filesystem.dll\vc-7_1-stlport\release\ threading-multi\boost_filesystem-vc71-mt-p-1_32.lib... ...skipped <@boost!lib>boost_filesystem-vc71-mt-p-1_32.dll for lack of <@boost!libs!filesystem!build\boost_filesystem.dll\vc-7_1-stlport\release\th reading-multi>boost_filesystem-vc71-mt-p-1_32.dll... ...skipped <@boost!lib>boost_filesystem-vc71-mt-p-1_32.lib for lack of <@boost!libs!filesystem!build\boost_filesystem.dll\vc-7_1-stlport\release\th reading-multi>boost_filesystem-vc71-mt-p-1_32.lib... vc-Link bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\debug\threading-multi\boost_program_options-vc71-mt-gdp-1_32.dll bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\debug\threading-multi\boost_program_options-vc71-mt-gdp-1_32.lib Creating library bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\debug\threading-multi\boost_program_options-vc71-mt-gdp-1_32.lib and object bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\debug\threading-multi\boost_program_options-vc71-mt-gdp-1_32.exp parsers.obj : error LNK2019: unresolved external symbol "class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > __cdecl boost::from_utf8(class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > const &)" (?from_utf8@boost@@YA?AV?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocato r@_W@2@@_STL@@ABV?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@3@ @Z) referenced in function "class basic_option<wchar_t>::boost::basic_option<wchar_t> __cdecl boost::program_options::`anonymous namespace'::woption_from_option(class basic_option<wchar_t>::boost::basic_option<char> const &)" (?woption_from_option@?A0x9e3965bc@program_options@boost@@YA?AV?$basic_optio n@_W@23@ABV?$basic_option@D@23@@Z) value_semantic.obj : error LNK2001: unresolved external symbol "class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > __cdecl boost::from_utf8(class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > const &)" (?from_utf8@boost@@YA?AV?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocato r@_W@2@@_STL@@ABV?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@3@ @Z) winmain.obj : error LNK2001: unresolved external symbol "class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > __cdecl boost::from_utf8(class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > const &)" (?from_utf8@boost@@YA?AV?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocato r@_W@2@@_STL@@ABV?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@3@ @Z) parsers.obj : error LNK2019: unresolved external symbol "class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > __cdecl boost::program_options::to_internal(class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > const &)" (?to_internal@program_options@boost@@YA?AV?$basic_string@DV?$char_traits@D@_ STL@@V?$allocator@D@2@@_STL@@ABV34@@Z) referenced in function "private: virtual bool __thiscall boost::program_options::detail::basic_config_file_iterator<char>::getline(cl ass _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > &)" (?getline@?$basic_config_file_iterator@D@detail@program_options@boost@@EAE_N AAV?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@_STL@@@Z) parsers.obj : error LNK2019: unresolved external symbol "class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > __cdecl boost::program_options::to_internal(class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > const &)" (?to_internal@program_options@boost@@YA?AV?$basic_string@DV?$char_traits@D@_ STL@@V?$allocator@D@2@@_STL@@ABV?$basic_string@_WV?$char_traits@_W@_STL@@V?$ allocator@_W@2@@4@@Z) referenced in function "private: virtual bool __thiscall boost::program_options::detail::basic_config_file_iterator<wchar_t>::getline (class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > &)" (?getline@?$basic_config_file_iterator@_W@detail@program_options@boost@@EAE_ NAAV?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@_STL@@@Z) winmain.obj : error LNK2001: unresolved external symbol "class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > __cdecl boost::program_options::to_internal(class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > const &)" (?to_internal@program_options@boost@@YA?AV?$basic_string@DV?$char_traits@D@_ STL@@V?$allocator@D@2@@_STL@@ABV?$basic_string@_WV?$char_traits@_W@_STL@@V?$ allocator@_W@2@@4@@Z) value_semantic.obj : error LNK2019: unresolved external symbol "class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > __cdecl boost::to_local_8_bit(class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > const &)" (?to_local_8_bit@boost@@YA?AV?$basic_string@DV?$char_traits@D@_STL@@V?$alloc ator@D@2@@_STL@@ABV?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocator@_W@ 2@@3@@Z) referenced in function "private: virtual void __thiscall boost::program_options::value_semantic_codecvt_helper<char>::parse(class boost::any &,class _STL::vector<class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> >,class _STL::allocator<class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > > > const &,bool)const " (?parse@?$value_semantic_codecvt_helper@D@program_options@boost@@EBEXAAVany@ 3@ABV?$vector@V?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@_STL @@V?$ allocator@V?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@_STL@@@2 @@_STL@@_N@Z) value_semantic.obj : error LNK2019: unresolved external symbol "class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > __cdecl boost::from_local_8_bit(class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > const &)" (?from_local_8_bit@boost@@YA?AV?$basic_string@_WV?$char_traits@_W@_STL@@V?$a llocator@_W@2@@_STL@@ABV?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@ D@2@@3@@Z) referenced in function "private: virtual void __thiscall boost::program_options::value_semantic_codecvt_helper<wchar_t>::parse(class boost::any &,class _STL::vector<class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> >,class _STL::allocator<class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > > > const &,bool)const " (?parse@?$value_semantic_codecvt_helper@_W@program_options@boost@@EBEXAAVany @3@ABV?$vector@V?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@_ STL@@V?$allocator@V?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@ _STL@@@2@@_STL@@_N@Z) bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\debug\threading-multi\boost_program_options-vc71-mt-gdp-1_32.dll : fatal error LNK1120: 5 unresolved externals CALL "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\VCVARS32.BAT" >nul "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\link" /nologo /INCREMENTAL:NO /DEBUG /DLL /subsystem:console /out:"bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1- stlport\debug\threading-multi\boost_program_options-vc71-mt-gdp-1_32.dll" /IMPLIB:"bin\boost\libs\program_options\build\boost_program_options.dll\vc-7 _1-stlport\debug\threading-multi\boost_program_options-vc71-mt-gdp-1_32.lib" /LIBPATH:"C:\SourceLibrary\STLport\STLport-4.6.2\lib" "stlport_vc71_stldebug.lib" @"bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlp ort\debug\threading-multi\boost_program_options-vc71-mt-gdp-1_32.CMD" ...failed vc-Link bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\debug\threading-multi\boost_program_options-vc71-mt-gdp-1_32.dll bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\debug\threading-multi\boost_program_options-vc71-mt-gdp-1_32.lib... ...skipped <@boost!lib>boost_program_options-vc71-mt-gdp-1_32.dll for lack of <@boost!libs!program_options!build\boost_program_options.dll\vc-7_1-stlport\ debug\threading-multi>boost_program_options-vc71-mt-gdp-1_32.dll... ...skipped <@boost!lib>boost_program_options-vc71-mt-gdp-1_32.lib for lack of <@boost!libs!program_options!build\boost_program_options.dll\vc-7_1-stlport\ debug\threading-multi>boost_program_options-vc71-mt-gdp-1_32.lib... vc-Link bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\release\threading-multi\boost_program_options-vc71-mt-p-1_32.dll bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\release\threading-multi\boost_program_options-vc71-mt-p-1_32.lib Creating library bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\release\threading-multi\boost_program_options-vc71-mt-p-1_32.lib and object bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\release\threading-multi\boost_program_options-vc71-mt-p-1_32.exp parsers.obj : error LNK2019: unresolved external symbol "class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > __cdecl boost::program_options::to_internal(class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > const &)" (?to_internal@program_options@boost@@YA?AV?$basic_string@DV?$char_traits@D@_ STL@@V?$allocator@D@2@@_STL@@ABV34@@Z) referenced in function "private: virtual bool __thiscall boost::program_options::detail::basic_config_file_iterator<char>::getline(cl ass _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > &)" (?getline@?$basic_config_file_iterator@D@detail@program_options@boost@@EAE_N AAV?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@_STL@@@Z) parsers.obj : error LNK2019: unresolved external symbol "class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > __cdecl boost::program_options::to_internal(class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > const &)" (?to_internal@program_options@boost@@YA?AV?$basic_string@DV?$char_traits@D@_ STL@@V?$allocator@D@2@@_STL@@ABV?$basic_string@_WV?$char_traits@_W@_STL@@V?$ allocator@_W@2@@4@@Z) referenced in function "private: virtual bool __thiscall boost::program_options::detail::basic_config_file_iterator<wchar_t>::getline (class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > &)" (?getline@?$basic_config_file_iterator@_W@detail@program_options@boost@@EAE_ NAAV?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@_STL@@@Z) winmain.obj : error LNK2001: unresolved external symbol "class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > __cdecl boost::program_options::to_internal(class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > const &)" (?to_internal@program_options@boost@@YA?AV?$basic_string@DV?$char_traits@D@_ STL@@V?$allocator@D@2@@_STL@@ABV?$basic_string@_WV?$char_traits@_W@_STL@@V?$ allocator@_W@2@@4@@Z) parsers.obj : error LNK2019: unresolved external symbol "class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > __cdecl boost::from_utf8(class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > const &)" (?from_utf8@boost@@YA?AV?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocato r@_W@2@@_STL@@ABV?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@3@ @Z) referenced in function "class basic_option<wchar_t>::boost::basic_option<wchar_t> __cdecl boost::program_options::`anonymous namespace'::woption_from_option(class basic_option<wchar_t>::boost::basic_option<char> const &)" (?woption_from_option@?A0x9e3965bc@program_options@boost@@YA?AV?$basic_optio n@_W@23@ABV?$basic_option@D@23@@Z) value_semantic.obj : error LNK2001: unresolved external symbol "class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > __cdecl boost::from_utf8(class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > const &)" (?from_utf8@boost@@YA?AV?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocato r@_W@2@@_STL@@ABV?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@3@ @Z) winmain.obj : error LNK2001: unresolved external symbol "class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > __cdecl boost::from_utf8(class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > const &)" (?from_utf8@boost@@YA?AV?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocato r@_W@2@@_STL@@ABV?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@3@ @Z) value_semantic.obj : error LNK2019: unresolved external symbol "class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > __cdecl boost::to_local_8_bit(class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > const &)" (?to_local_8_bit@boost@@YA?AV?$basic_string@DV?$char_traits@D@_STL@@V?$alloc ator@D@2@@_STL@@ABV?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocator@_W@ 2@@3@@Z) referenced in function "class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > __cdecl boost::program_options::`anonymous namespace'::convert_value(class basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> >::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > const &)" (?convert_value@?A0x87f58489@program_options@boost@@YA?AV?$basic_string@DV?$ char_traits@D@_STL@@V?$allocator@D@2@@_STL@@ABV?$basic_string@_WV?$char_trai ts@_W@_STL@@V?$alloc ator@_W@2@@5@@Z) value_semantic.obj : error LNK2019: unresolved external symbol "class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > __cdecl boost::from_local_8_bit(class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > const &)" (?from_local_8_bit@boost@@YA?AV?$basic_string@_WV?$char_traits@_W@_STL@@V?$a llocator@_W@2@@_STL@@ABV?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@ D@2@@3@@Z) referenced in function "private: virtual void __thiscall boost::program_options::value_semantic_codecvt_helper<wchar_t>::parse(class boost::any &,class _STL::vector<class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> >,class _STL::allocator<class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > > > const &,bool)const " (?parse@?$value_semantic_codecvt_helper@_W@program_options@boost@@EBEXAAVany @3@ABV?$vector@V?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@_ STL@@V?$allocator@V?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@ _STL@@@2@@_STL@@_N@Z) bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\release\threading-multi\boost_program_options-vc71-mt-p-1_32.dll : fatal error LNK1120: 5 unresolved externals CALL "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\VCVARS32.BAT" >nul "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\link" /nologo /INCREMENTAL:NO /DLL /subsystem:console /out:"bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1- stlport\release\threading-multi\boost_program_options-vc71-mt-p-1_32.dll" /IMPLIB:"bin\boost\libs\program_options\build\boost_program_options.dll\vc-7 _1-stlport\release\threading-multi\boost_program_options-vc71-mt-p-1_32.lib" /LIBPATH:"C:\SourceLibrary\STLport\STLport-4.6.2\lib" "stlport_vc71.lib" @"bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlp ort\release\threading-multi\boost_program_options-vc71-mt-p-1_32.CMD" ...failed vc-Link bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\release\threading-multi\boost_program_options-vc71-mt-p-1_32.dll bin\boost\libs\program_options\build\boost_program_options.dll\vc-7_1-stlpor t\release\threading-multi\boost_program_options-vc71-mt-p-1_32.lib... ...skipped <@boost!lib>boost_program_options-vc71-mt-p-1_32.dll for lack of <@boost!libs!program_options!build\boost_program_options.dll\vc-7_1-stlport\ release\threading-multi>boost_program_options-vc71-mt-p-1_32.dll... ...skipped <@boost!lib>boost_program_options-vc71-mt-p-1_32.lib for lack of <@boost!libs!program_options!build\boost_program_options.dll\vc-7_1-stlport\ release\threading-multi>boost_program_options-vc71-mt-p-1_32.lib... FileClone C:\Boost\lib\boost_regex-vc71-mt-gdp-1_32.lib FileClone C:\Boost\lib\boost_signals-vc71-mt-gdp-1_32.lib ...skipped <@boost!lib>boost_filesystem-vc71-mt-gdp.lib for lack of <@boost!lib>boost_filesystem-vc71-mt-gdp-1_32.lib... ...skipped <@boost!lib>boost_filesystem-vc71-mt-p.lib for lack of <@boost!lib>boost_filesystem-vc71-mt-p-1_32.lib... ...skipped <@boost!lib>boost_program_options-vc71-mt-gdp.lib for lack of <@boost!lib>boost_program_options-vc71-mt-gdp-1_32.lib... ...skipped <@boost!lib>boost_program_options-vc71-mt-p.lib for lack of <@boost!lib>boost_program_options-vc71-mt-p-1_32.lib... HardLink C:\Boost\lib\boost_regex-vc71-mt-gdp.lib HardLink C:\Boost\lib\boost_signals-vc71-mt-gdp.lib ...failed updating 4 targets... ...skipped 12 targets... ...updated 4 targets... I successfully created boost libs with STLPort 4.6.2 but have no idea what goin wrong here. Any help is appreciated..

2 2

boost::program_options exception reasons.
by Vladislav Lazarenko 20 Apr '05

20 Apr '05

Good day, guys. I am new to boost and have some qestion concerns boost::program_options library. I've wrote a simple program (see code below), and when I trying to pass multiple '--help' option to the program, it throws exception with reason "multiple_occurrences". This exception reason may confuse the end-user, I wanna get some more pretty error description. So, I have only 2 solutions: 1) Prase exception reason and give a user more informative/pretty description. 2) Refactor boost::program_options to enable it to throw exceptions with informative reason. I need a hint from professional. BTW, how can I contribute to boost::program_options? Where can I read some docs? Thank you very much in advance and sorry for inconvenience. // Code: #include <string> #include <vector> #include <iostream> #include <exception> #include <boost/program_options.hpp> using namespace std; namespace po = boost::program_options; template<class T> ostream & operator << (ostream & os, const vector<T> & v) { copy(v.begin(), v.end(), ostream_iterator<T>(cout, " ")); return os; } int main(int argc, char *argv[]) { try { po::options_description desc("Options:"); desc.add_options() ("help", "produce help message") ("phone", po::value<vector<string> >()->multitoken(), "mobile phone number to send SMS to") ; po::variables_map vm; po::store(po::parse_command_line(argc, argv, desc), vm); po::notify(vm); if (vm.count("phone") > 0) { cout << "Phones: " << vm["phone"].as< vector<string> >() << endl; } } catch(exception & e) { cerr << "Unable to parse command line: " << e.what() << endl; return 1; } return 0; }

2 3

Boost serialization: 'serialize' : is not a member of 'std::vector<_Ty>'
by Vishnu Mahadevan Menon 20 Apr '05

20 Apr '05

Hello! I seem to be getting the following compilation error even after I've included <boost/serialization/vector.hpp> in the source file. I'm using VS.net 7.1 to compile. [QUOTE] c:\Boost\include\boost_1_32_0\boost\serialization\access.hpp(106) : error C2039: 'serialize' : is not a member of 'std::vector<_Ty>' with [ _Ty=std::string ] c:\Boost\include\boost_1_32_0\boost\serialization\serialization.hpp(78) : see reference to function template instantiation 'void boost::serialization::access::serialize<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::xml_iarchive, T=std::vector<std::string> ] c:\Boost\include\boost_1_32_0\boost\serialization\serialization.hpp(121) : see reference to function template instantiation 'void boost::serialization::serialize<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::xml_iarchive, T=std::vector<std::string> ] c:\Boost\include\boost_1_32_0\boost\archive\detail\iserializer.hpp(159) : see reference to function template instantiation 'void boost::serialization::serialize_adl<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::xml_iarchive, T=std::vector<std::string> ] c:\Boost\include\boost_1_32_0\boost\archive\detail\iserializer.hpp(109) : while compiling class-template member function 'void boost::archive::detail::iserializer<Archive,T>::load_object_data(boost::archive::detail::basic_iarchive &,void *,const unsigned int) const' with [ Archive=boost::archive::xml_iarchive, T=std::vector<std::string> ] [Long dump.. UNQUOTE] Could anyone tell me why the above is happening and how to get around the problem? I'll post the source-code if that'll help! I also searched and stumbled into (http://lists.boost.org/boost/2005/02/19606.php) which *seems* to be saying that the issue is addressed somewhere in the serialization documentation, but was unable to locate where. Thanks and regards, Vishnu. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

2 1

[repost] integer tests not working on 64 bit platforms
by Markus Schöpflin 20 Apr '05

20 Apr '05

The following is a repost of a message I mailed in last september. The problem with the test is still present in the current CVS. Would anyone mind if I just go for the first fix proposed? Markus ---%<--- Currently the integer tests report an error on 64 bit platforms, as can be seen on http://tinyurl.com/7aoe9 The following code in integer_test.cpp causes the problem: PRIVATE_FIT_TESTS( int_t, least, long, LONG_MAX ); PRIVATE_FIT_TESTS( int_t, fast, long, LONG_MAX ); PRIVATE_FIT_TESTS( uint_t, least, unsigned long, ULONG_MAX ); PRIVATE_FIT_TESTS( uint_t, fast, unsigned long, ULONG_MAX ); The first line expands to: do { long v = LONG_MAX ; PRIVATE_FIT_TEST(int_t, 32, least, v); v >>= 1; PRIVATE_FIT_TEST(int_t, 31, least, v); v >>= 1; ... } which becomes: do { long v = LONG_MAX ; BOOST_TEST( int_t < 32 > :: least ( v ) == v ); v >>= 1; BOOST_TEST( int_t < 31 > :: least ( v ) == v ); v >>= 1; ... } which of course alway fails on 64 bit platforms because LONG_MAX is a 64 bit number. A possible fix would be to start the test with 64 bit and not 32 on 64 bit platforms. But how can 64 bit platforms be detected? Probably with #if (LONG_MAX > INT_MAX) ... #endif or something like this. Another fix (which ignores 64 bit values alltogether) would be to change the lines above to not use long and LONG_MAX but int and INT_MAX. Opinions, anyone? Markus --->%---

4 3

Review Managers Needed
by Tom Brinkman 20 Apr '05

20 Apr '05

Review Managers Needed The following libraries will be up for review in the next few weeks and require review manager volunteers. If you are familiar with one of these libraries and would like to volunteer, please contact me (Tom Brinkman reportbase(a)gmail.com) and let me your availablilty. 1) Typeof 2) Singleton 3) FOREACH Macro 4) Function Types 1) Typeof Arkadiy Vertleyb, Peder Holt http://boost-sandbox.sourceforge.net/vault/ (typeof.zip) The proposed Typeof library implements the functionality of the non-standard typeof() operator. Depending on the compiler, it utilizes one of the following three methods: 1) Forwards to the non-standard typeof extension, usually called __typeof__, on the compilers where such extension is available; 2) Utilises a loophole, available on the Microsoft vc6.5, vc7.0, and vc7.1; 3) Emulates typeof by the means of template and preprocessor metaprogramming for the compilers that do not fall into above two categories, such as vc8.0 beta, etc. This method is rather portable, and can also be used on the compilers that implement the __typeof__ as a language extension, when compiling with language extensions switched off. The emulation mode is currently working with vc7.1, vc8.0 beta, and gcc 3.3/3.4; The MS-specific trick is working with vc6.5, 7.0, and 7.1. The __typeof__ extension forwarding is working with gcc 3.3/3.4 and Metrowerks. 2) Singleton Jason Hise http://tinyurl.com/6qvrd (Singleton) The singleton library provides multiple powerful methods of controlling the lifetimes of global resources. Client code can choose among the many provided methods of creation, or can easily write new creators for specialized initialization needs. Client code can additionally control precisely when a singleton instance is automatically created and destroyed, can create and destroy singleton instances explicitly any number of times, and can set up dependencies between singletons in an easy and natural way. 3) FOREACH Macro Eric Niebler No description available. 4) Function Types Tobias Schwinger tschwinger(a)neoscientists.org http://tinyurl.com/4oe7q This library provides a metaprogramming facility to classify, decompose and synthesize function-, function pointer-, function reference- and member function pointer types. For the purpose of this documentation, these types are collectively referred to as function types (this differs from the standard definition and redefines the term from a programmer's perspective to refer to the most common types that involve functions). The classes introduced by this library shall conform to the concepts of the Boost Metaprogramming library (MPL). The Function Types library enables the user to: * test an arbitrary type for being a function type of specified kind, * inspect properties of function types, * view and modify sub types of an encapsulated function type with MPL Sequence operations, and * synthesize function types. This library supports variadic functions and can be configured to support non-default calling conventions.

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(no subject)
by kevlin＠curbralan.com 20 Apr '05

20 Apr '05

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[circular_buffer] comparison operators
by Fredrik Blomqvist 19 Apr '05

19 Apr '05

Hi, I was browsing the docs for the upcoming circular_buffer component and noticed that the declaration of the comparison operators use the following, "traditional" style. template <class T, class Alloc> bool operator< (const circular_buffer<T,Alloc>& lhs, const circular_buffer<T,Alloc>& rhs); I think they should be templatized on both the lhs And rhs, like so: template <class T0, class Alloc0, class T1, class Alloc1> bool operator< (const circular_buffer<T0,Alloc0>& lhs, const circular_buffer<T1,Alloc1>& rhs); Not earth-shattering perhaps, but still a nice flexibility improvement IMHO. This scheme is used by several other boost components like for ex multi-index. Regards // Fredrik Blomqvist

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What I Hate About How We Abstract System Dependence
by Aaron W. LaFramboise 19 Apr '05

19 Apr '05

Over the past few years, the style of our abstract interfaces for system-dependent features has bothered me more and more. Here’s my challenge to those happy with the status quo: Find me an interface in Boost or the C++ standard that represents an observable inter-program interface, such that, for any popular operating system, I can’t find a feature of the operating system that is impossible to express using that interface without relying on undefined behavior, undocumented behavior, or circumventing access specifiers. First, a realistic example is in order. We all know and love C++ standard iostreams (“iostreams library,” <http://www.cplusplus.com/ref/iostream>), which is almost certainly the most widespread operating system abstraction in the C++ world. So we create a std::ifstream, and use it to open some file. Now we want to map this file to a region of memory. Do what?! Suddenly, everyone breaks out in laughter, with tears rolling down their cheeks, little globules of spittle escaping from the corners of their mouths, ridiculing the very notion of any standard library being involved in such a reasonable and common operation. But why? The operating system can do this, and it’s not incompatible in the slightest with the concept or interface of std::ifstream. In fact, if we had some way of stealing the secret file descriptor stashed away inside the filebuf, we could do it—but programmers, deep down, feel that this sort of access just isn’t right. Grab some popcorn and watch programmers sweat and squirm in their own cognitive dissonance as they try to find an elegant solution to this insolvable problem (“Legalize access to file descriptors now!” <http://gcc.gnu.org/ml/libstdc++/2005-02/msg00090.html>). Let me get straight to the heart of the problem: we love our concrete interfaces. Every programmer loves the ability to be able to manipulate a class, knowing its complete interface, exactly what sort of animal it is, and exactly what its going to do—and know all of this before the program ever runs for the first time. I hope I’m not bursting anyone’s bubble here, but if when we’re talking about components that abstract system interfaces, then this just isn’t the way the world works. It’s time we grow up, get out of the playpen, and realize that there really is a big scary world of polymorphism out there. My core belief is this. We don’t fully know the capabilities of the system components we manipulate, not at compile time, not at load time, and perhaps not even by the time the program halts. Any interface that pretends to is a lie, and most of the time, a pretty bad liar at that. Here’s another one of my favorite examples, in Boost.Threads (“Boost.Threads,” <http://www.boost.org/doc/html/threads.html>). boost::thread lacks a method to forcefully terminate a thread, despite the fact that many threading systems have one. However, we can’t add one, because there exists at least one threading system that doesn’t have this feature. Well, we *could*, but then we’d be playing a game of chicken with the user daring them to call a function that has completely undecidable behavior. Now let’s say the user was really determined get this feature, and so she decided to write her own thread class. Nope, she loses again! Because her class is not named boost::thread, the class is incompatible with all of the rest of the thread manipulation functions, and so is entirely unusable with Boost.Threads. Do you like scary movies? I have an idea for one. It’s about a future C++ standard that includes a threading library that I can’t use if I want forced termination semantics, or any other feature that any operating system has that the library lacks. Besides the inability of our concrete interfaces to support a capability set that varies, and the lack of ability to reimplement these interfaces compatibly, concrete schemes also can’t represent what I call /multi-interface systems/. Some environments, such as Cygwin (“Cygwin Information and Installation,” <http://www.cygwin.com>), have two (or more) entirely distinct sets of system interfaces that may be used as underlying primitives for a particular concept. In the case of Cygwin and threads, the environment supports both the POSIX and Windows thread interfaces. Both may be used simultaneously, and as each system has its own unique characteristics, it may be entirely reasonable to do so. But, Boost.Threads can’t do this, and really couldn’t possibly be expected to, in its current form. Note that the total set of capabilities is not decidable at compile time, or even load time. For instance, let’s say we’re using a process class on a System V-style system. We’re implementing a debugger, and so we’d like to get access to the process’ core memory through the /proc interface. However, up until we actually try to do so, we really have no way of knowing whether this is supported, as the /proc filesystem may well not be mounted. I’m calling for polymorphism. These interfaces really are conceptually polymorphic; let’s reflect that in our language. Let’s give the user the tools she needs to be able to write her own compatible classes when the ones we write prove insufficient. For the sake of exposition, let me propose a sketch of a possible design for a process class. A generic process is represented by an abstract base class. Derived from it are classes for the major types of processes: POSIX, Windows, DCE, and whatever else. Derived from each of those are specific variants of these types, with additional or extended capabilities. For example, a child of the POSIX class might be a class implementing the ptrace() process debugging interface. Naturally, we’d instantiate objects of these classes with some factory. Since we might not know at creation time exactly what capabilities the system has, or what capabilities are needed, we need a copying mechanism to construct a new process from an old one. This copy might, for example, copy the POSIX base, so as to get the process identifier, and slice the rest off, as unneeded. Clearly there would need to be significant design effort put into this area. This and other implementation issues are mostly tangential from my primary concerns. Finally, pointers are a pain, so we can wrap pointers to a process in your favorite smart pointer. This smart pointer might have additional associated mechanics to enable it to automatically select the best kind of process creation machinery as it is able. I could see this basic process class (which is practically concrete) as having a very pleasant and desirable syntax. Lastly, performance needs to be addressed. I’m not at all worried about making operations that would be normal function calls into virtual function calls, and you shouldn’t be, either. An indirect call will often have a cost an order of magnitude less than the cost of the actual underlying system operation, which might involve many more indirect calls, context switches, and synchronization. A more significant concern is the additional machinery needed to support virtual inheritance. RTTI may also be necessary to fully exercise the class hierarchy’s capabilities. However, when using the subset of features that would be available to an equivalent concrete implementation, RTTI and similar should not be needed, so a user shouldn’t have to pay (too much) for what she’s not using. So here’s my question to the Boost community. How many people have similar concerns and experiences? How often, in real code, do concrete classes prove insufficient? Who here has to entirely reimplement libraries like Boost.Threads for relatively silly reasons? Are there any alternate solutions for the problem I describe? What unforeseen problems might there be with this polymorphic style? Would you use a library such as Boost.Thread if it had been rewritten in this manner? Submitted with Love, Aaron W. LaFramboise

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