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link problems with precompiled headers and boost libs?
by co_tangens 28 Jul '03

28 Jul '03

Hi, I'm using the datetime library of boost 1_30_0 with VC7.1 with precompiled headers on. We're getting the following link warnings/errors: om.lib(bg_extra.obj) : warning LNK4006: ___@@_PchSym_@00@UwvevolknvmgUtnkEPozhgUhlfixvUytPzwwOlyq@ already defined in om.lib(bg_init.obj); second definition ignored om.lib(bg_extra.obj) : error LNK2005: ___@@_PchSym_@00@UwvevolknvmgUtnkEPozhgUhlfixvUytPzwwOlyq@ already defined in om.lib(bg_init.obj) We include boost headers in our own header files. Our own headerfiles are then used to create a precompiled header. It seems that all object files that use the precompiled header get these link errors... Does anyone know the reason/ a solution for this error? Thanks a lot!

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spirit & tokenizer
by Andrey Sverdlichenko 28 Jul '03

28 Jul '03

Hello. Is there any "right way" to parse strings, already splitted with tokenizer? I wrote iterator that can work with this splitted strings, but i also need some "skip parser" to recognize token boundaries as whitespaces and can't design one. -- Best regards, Andrey mailto:blaze@lists.infosec.ru

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lexical_cast problem with Unicode
by Stefan Felkel 27 Jul '03

27 Jul '03

I have problems compiling the following piece of code under Microsoft Visual C++ 6.0 with UNICODE defined. The compiler complains about a missing operator<<. What can I do in order to get this programme compiled ? #include <iostream> #include <boost/lexical_cast.hpp> int main( int argc, char * argv [] ) { std::wcout << boost::lexical_cast<std::wstring>( std::wstring( L"test" ) ).c_str() << L"\n"; return 0; } c:\programme\boost_1_30_0\boost\lexical_cast.hpp(148): error C2679: binary '<<': no operator defined which takes a right-hand operand of type 'const wstring' (or there is no acceptable conversion) c:\programme\boost_1_30_0\boost\lexical_cast.hpp(146): while compiling class-template member function 'bool boost::detail::lexical_stream<wstring,wstring>::operator <<(const wstring &)' Thanks in advance, Stefan

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Announce: Advanced Los Angeles C++ Users Group
by Jon Stewart 27 Jul '03

27 Jul '03

Hi! A small group of like-minded C++ programmers in Pasadena, CA has been meeting regularly for the past few months. The group's name is ALACPP, for Advanced Los Angeles C++, and we're interested in teaching ourselves more about generic programming and other advanced C++ techniques. Obviously, we're Boost users! We read books together and have weekly lunch meetings to discuss them; we just finished _Modern C++ Design_ and are moving on to Herb Sutter's _Exceptional C++_. We're also organizing periodic evening meetings, to explore specific topics in depth. If you'd like to give a relevant presentation to the group, please contact me! If you're in the Los Angeles area, I invite you to check out the group. Our meager website can be found here: http://www.alacpp.org and you can sign up for our mailing list here: http://lists.ellipsis.cx/mailman/listinfo/alacpp Thanks! Jon -- Jon Stewart stew1(a)ellipsis.cx

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Newbie shared_ptr in a container question.
by Joshua 27 Jul '03

27 Jul '03

I've been reading through posts on here and in the docs but I think I may have missed something. Heres what I am trying to do: lets say I have a class Foo* and I'm trying to use it in a std::vector<shared_ptr<Foo> >. I can add them all day long and it works fine. The problem is that when I try to remove the shared_ptr from the vector. I expected it to delete the memory for the Foo* then delete itself (to completely free the memory that the shared_ptr used and the memory that the Foo was using. I think this is not happening though since the destructor is not being called when the elements are removed from the vector. Heres how I am currently inserting the shared_ptr's into the vector (yes I know this is the wrong way now that I've read a few of the posts here): typedef std::vector<boost::shared_ptr<Foo> > FooVector; FooVector Foobar; Foo* blah = new Foo(); boost::shared_ptr<Foo> * NewPointer = new boost::shared_ptr<Foo>(blah); Foobar.insert(*NewPointer); //Yes I know this looks horrible. And its probably wrong. When I call Foobar.erase() I thought that the shared_ptr would be removed and the memory freed (and Foo's destructor called). I tried it like this : FooVector::iterator CurrentFoo = Foobar.begin(); Foobar.erase(CurrentFoo); That did remove the shared_ptr but the Foo* did not seem to get deallocated, its destructor was never called. Some of the posts seem to indicate that this is a very bad way to let shared_ptr manager the memory, is there a better way to do what I want to do using shared_ptr or is shared_ptr the wrong tool to use?

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Building Thread Tests on Red Hat 9.0
by Paul Grenyer 26 Jul '03

26 Jul '03

Hi All I'm trying the boost threading library for the first time. I've successfully built the threading library itself and now I want to build the tests. I've followed the instructions, but the build seems to hang at this point: execute-test ../../../libs/thread/test/bin/test_once.test/gcc/debug/runtime-link-dynamic/threading-multi/test_once.run Is this normal? I've left it for a few minutes to see if I was just being impatient, but it doesn't continue. Also, I've been looking for some code examples in the documentation on the website, I seem to remember there being some when I looked at potentially using the threads on Windows about 18 months ago, but I can't find them now. Any pointers greatly appreciated. -- Regards Paul Paul Grenyer Email: pjgrenyer(a)iee.org Web: www.paulgrenyer.co.uk EvaneScence: http://www.evanescence.com

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Newbie: boost::filesystem::fstream base class undefined error
by sea2stl 25 Jul '03

25 Jul '03

I am using VC++6 SP5, STLPort 4.5.3, boost 1.30.0. I am tring to use boost::filesystem::fstream objects in conjuction with boost::filesystem::path objects. When I create an ifstream object, the compiler gives the following message: error C2504: 'basic_ifstream<char,class _STL::char_traits<char> >' : base class undefined. Above error takes me to ln 47 in fstream.hpp. Similar problem with ofstream. Any suggestions? Thanks, Aaron Laws

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RE: [Boost-Users] Newbie missing a header for boost_date_time?
by Jeff Garland 25 Jul '03

25 Jul '03

Dick B. wrote: > I'm pretty sure the headers are being found. If I replace posix_time.hpp > with posix_time_types.hpp, the error and many of the warnings disappear. > In other words... Ok. > #include <boost/date_time/gregorian/gregorian.hpp> > //#include <boost/date_time/posix_time/posix_time.hpp> > #include <boost/date_time/posix_time/posix_time_types.hpp> > > avoids the error message. This is because commenting out 'posix_time.hpp' eliminates the I/O code from the library. This is the part that uses lexical_cast which is where the error is occuring. > ...which refers to lexical_cast.hpp > > template<typename Target, typename Source> > class lexical_stream > { > bool operator<<(const Source &input) > { > here ===> return stream << input; <==== here > } > } > > So I assume there's a header somewhere that defines the '<<' operator > referred to. I don't know if this is related to my use of VC7.1 or not. > I'm trying to find someone around here with VC7 to build boost_1_30_0 and > see if that makes a difference. No luck so far. I'm starting to think this may be related to the 1_30_0 lexical cast problem. Can you upgrade lexical_cast.hpp from cvs? You can download it from here: http://cvs.sourceforge.net/cgi- bin/viewcvs.cgi/boost/boost/boost/lexical_cast.hpp Jeff

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Need help with BOOST unit test framework!
by rudugani 25 Jul '03

25 Jul '03

hi, Essentially what I'm trying to do(the code is attached below) , is pass a base class member pointer (member function should automatically be visible in the derived class) , to the BOOST framework. However, since the member function is statically not visible in the derived class, a compile time error is generated . I'm *thinking* that some kind of casting operation is required but not very sure how! could anybody enlighten me as to how to get the code snippet below running? Thanks! CODE: #include <iostream.h> /*-------------------- BOOST FRAMEWORK --------------------- */ #include <test/included/unit_test_framework.hpp> using boost::unit_test_framework::test_suite; class baseTrailTest{ public: baseTrailTest(){}; ~baseTrailTest(){}; protected : void trail(){ cout << " trail!!!! " << endl; } }; class TrailTest: public baseTrailTest{ }; struct trail_test_suite : public test_suite { trail_test_suite() : test_suite("trail_test_suite") { // add member function test cases to a test suite boost::shared_ptr<TrailTest> instance(new TrailTest); add( BOOST_CLASS_TEST_CASE( &TrailTest::trail ,instance ), 0 ); } }; test_suite* init_unit_test_suite( int argc, char * argv[] ) { std::auto_ptr<test_suite> test( BOOST_TEST_SUITE( "example" ) ); /*if( argc < 2 ) return (test_suite*)0;*/ test->add( new trail_test_suite); return test.release(); }

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using the signals lib
by Roel Vanhout 25 Jul '03

25 Jul '03

Hello all, I'm sorry if this is a faq (it almost has to be) but I couldn't find anything in the signals documentation nor in the general build instruction. I've build the signals library using jam as described in the build instructions, I've added the resulting library to my linker list but then I get the errors below about several symbols being multiply defined. I'm using MSVC 7.0 (Visual Studio .Net, not .Net 2003). What do I do wrong? Thanks. cheers, roel ------ Build started: Project: boost_signaltest, Configuration: Debug Win32 ------ Linking... msvcprt.lib(MSVCP70.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::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 &)" (??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@@Z) already defined in boost_signaltest.obj msvcprt.lib(MSVCP70.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::~basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(void)" (??1?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in boost_signaltest.obj msvcprt.lib(MSVCP70.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(char const *)" (??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@PBD@Z) already defined in boost_signaltest.obj MSVCRT.lib(MSVCR70.dll) : error LNK2005: "public: __thiscall exception::exception(void)" (??0exception@@QAE@XZ) already defined in LIBCD.lib(stdexcpt.obj) MSVCRT.lib(MSVCR70.dll) : error LNK2005: "public: virtual __thiscall exception::~exception(void)" (??1exception@@UAE@XZ) already defined in LIBCD.lib(stdexcpt.obj) MSVCRT.lib(MSVCR70.dll) : error LNK2005: "public: __thiscall exception::exception(class exception const &)" (??0exception@@QAE@ABV0@@Z) already defined in LIBCD.lib(stdexcpt.obj) MSVCRT.lib(MSVCR70.dll) : error LNK2005: "public: int __thiscall type_info::operator==(class type_info const &)const " (??8type_info@@QBEHABV0@@Z) already defined in LIBCD.lib(typinfo.obj) MSVCRT.lib(ti_inst.obj) : error LNK2005: "private: __thiscall type_info::type_info(class type_info const &)" (??0type_info@@AAE@ABV0@@Z) already defined in LIBCD.lib(typinfo.obj) MSVCRT.lib(ti_inst.obj) : error LNK2005: "private: class type_info & __thiscall type_info::operator=(class type_info const &)" (??4type_info@@AAEAAV0@ABV0@@Z) already defined in LIBCD.lib(typinfo.obj) LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library Debug/boost_signaltest.exe : fatal error LNK1169: one or more multiply defined symbols found Build log was saved at "file://c:\test\boost_signaltest\boost_signaltest\Debug\BuildLog.htm" boost_signaltest - 10 error(s), 1 warning(s) ---------------------- Done ---------------------- Build: 0 succeeded, 1 failed, 0 skipped -- Roel Vanhout - Programmer/Systems Administrator RIKS BV Papenstraat 8 - 6211 LG Maastricht Tel +31 (0)43 388 3708 - Fax +31 (0)43 325 3155

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RE: [Boost-Users] Newbie missing a header for boost_date_time?
by dick.bridges＠tais.com 24 Jul '03

24 Jul '03

<previous> > I must be missing one or more headers but I can't figure it out. Can > someone help get me pointed in the right direction? > ...lots of compiler stuff omitted... My guess is that you don't have the boost root directory in your include path options. This would be the boost\boost_1_30_0 directory.... HTH, Jeff </previous> I'm pretty sure the headers are being found. If I replace posix_time.hpp with posix_time_types.hpp, the error and many of the warnings disappear. In other words... #include <boost/date_time/gregorian/gregorian.hpp> //#include <boost/date_time/posix_time/posix_time.hpp> #include <boost/date_time/posix_time/posix_time_types.hpp> avoids the error message. Changing it back to: #include <boost/date_time/gregorian/gregorian.hpp> #include <boost/date_time/posix_time/posix_time.hpp> //#include <boost/date_time/posix_time/posix_time_types.hpp> results in... <error> c:\boost\boost_1_30_0\boost\lexical_cast.hpp(147) : error C2679: binary ' <<' : no operator found which takes a right-hand operand of type 'const boost::token_iterator_generator<TokenizerFunc,Iterator,Type>::value_type' (or there is no acceptable conversion) with [ TokenizerFunc=boost::char_delimiters_separator<char>, Iterator=std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator, Type=std::string ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(146) : while compiling class-template member function 'bool boost::detail::lexical_stream<Target,Source>::operator <<(const Source &)' with [ Target=unsigned short, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(189) : see reference to class template instantiation 'boost::detail::lexical_stream<Target,Source>' being compiled with [ Target=unsigned short, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\date_time\time_parsing.hpp(30) : see reference to function template instantiation 'Target boost::lexical_cast<unsigned short,boost::token_iterator_generator<TokenizerFunc,Iterator,Type>::value_type>(Source)' being compiled with [ Target=unsigned short, TokenizerFunc=boost::char_delimiters_separator<char>, Iterator=std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator, Type=std::string, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c: \boost\boost_1_30_0\boost\date_time\posix_time\time_parsers.hpp(18) : see reference to function template instantiation 'time_duration boost::date_time::parse_delimited_time_duration<boost::posix_time::time_duration>(const std::string &)' being compiled with [ time_duration=boost::posix_time::time_duration ] </error> ...which refers to lexical_cast.hpp template<typename Target, typename Source> class lexical_stream { bool operator<<(const Source &input) { here ===> return stream << input; <==== here } } So I assume there's a header somewhere that defines the '<<' operator referred to. I don't know if this is related to my use of VC7.1 or not. I'm trying to find someone around here with VC7 to build boost_1_30_0 and see if that makes a difference. No luck so far.

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[uBLAS] Constructing from std::vector
by Alex Henderson 24 Jul '03

24 Jul '03

Hi, I'm starting to play with the uBLAS library. So far so good... I'd like to be able to construct a ublas::vector from a std::vector. I can't seem to find how to do this. Do I have to go through std::copy or something equivalent or is there a constructor I've missed? If it doesn't exist, is there a reason why not? Perhaps there are some holes in my understanding. Thanks, Alex

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Binary compatibility of boost dll files
by Rodolfo Lima 24 Jul '03

24 Jul '03

I see that several boost libraries can be compiled as dll files. I'd like to know if there's any concern about binary compatilibity between different versions of those dll's as boost's version number (and possibly the library itself) changes. For instance, whenever MFC's dll binary interface changes, we have another library version written in it's name (MFC42.dll, MFC70.dll, MFC71.dll...), this way we can help avoiding "dll hell". It would be also cool to link a version resource in each dll. This way, installers would check if a newer dll exists in the system, avoiding overwriting with an older one. And one last thing... the import library of date_time's dll isn't being generated, making it unusable. It's better to delete the dll target of its jamfile. If any help of my part is needed, I'd be glad to help. regards, rod

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RE: [Boost-Users] Is there a boost_date_time dll?
by Jeff Garland 24 Jul '03

24 Jul '03

> Development environment is .NET 2003 (i.e., VC7.1). > > I'm reasonably sure there were no errors when I built boost_1_30_0. > > \boost_1_30_0\libs\date_time\build\bin\boost_date_time.dll certainly exists > - but it's a directory that contains a subdirectory (. > \vc7\debug\runtime-link-dynamic) that contains a .CMD, .pdb and two .obj > files. As the old saying goes: "I can see fine - I just don't understand > what I'm looking at." > > I'm clearly having a "senior moment" but honestly: I searched boost.org, > google.com and [even] altavista.com/web/adv. > > Any pointers to get me back on the right track would be appreciated. Couple of thoughts here: 1) Look for the static lib instead. This is the one I'm sure works. And anyway, there is hardly anything in the library anyway so there really isn't an much advantage to a dll. 2) Try doing the library build again, but at the date-time level only. Change down to libs/date_time/build and run bjam. This might give you some hints about what actually built. Jeff

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RE: [Boost-Users] Newbie missing a header for boost_date_time?
by Jeff Garland 24 Jul '03

24 Jul '03

> I must be missing one or more headers but I can't figure it out. Can > someone help get me pointed in the right direction? > ...lots of compiler stuff omitted... My guess is that you don't have the boost root directory in your include path options. This would be the boost\boost_1_30_0 directory.... HTH, Jeff

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RE: [Boost-Users] boost::date_time + setting system clock
by Jeff Garland 24 Jul '03

24 Jul '03

> I was wondering if it is possible to set the clock using date_time. I been >looking but have found no clue that it is so. From what I have seen so far, > this library does a lot of cool stuff, and why not this. I'm afraid the library doesn't support this feature. Contributions are always welcome, though ;-) > I am working on a little personal project that uses an ORB. The idea is > to have all clocks synchronized. I have one machine that queries an > atomic time server. After having done so it will call each machine > and synchronize them. I am currently running a mix of Linux, Solaris, > WIN NT 2000 and XP... and it freaks me out not to have them > synchronized. Why not just use NTP? http://www.ntp.org/ Jeff

2 1

Problem with regular expression
by Javier de Acha 24 Jul '03

24 Jul '03

Hello, The next few lines doesn't work (1) with \s. But (2) works well [[:space:]] regbase::escape_in_lists dont func? Someone it knows because? Thanks Javier --------------------------------------------------------------------- (1) void main() { regex exp("\s(ab)*",regbase::perl); cmatch what; if(regex_match(" ababab", what, exp)) { string str = what[0]; //this fail } } -------------------------------------------------------------------------------- (2) void main() { regex exp("[[:space:]](ab)*",regbase::perl); cmatch what; if(regex_match(" ababab", what, exp)) { string str = what[0]; //this succesfully match } } [Non-text portions of this message have been removed]

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Random Number Generation
by tylersc111 23 Jul '03

23 Jul '03

I've got three questions/comments regarding the Random Number Library: Question (1) --------------------------------------------------------- How about including a facility for generating "antithetic random variates"? (Do a google search if the term is unfamiliar). A partial implementation might be something like the following, (I haven't tried compiling this, so please pardon any syntax errors...): template< class URNG > // Uniform Random Number Generator class antithetic { private: URNG urng; public: explicit antithetic( s ) { urng.seed(s); } // Perhaps not quite right (see question (2) below) typename URNG::result_type operator()() { return URNG::max_value - urng(); } }; Then one would be able to construct two antithetic variates (rng1 & rng2) as follows: mt19937 rng1(seed); antithetic<mt19937> rng2(seed); Question (2) -------------------------------------------------------- Regarding the "uniform_01" generator (and a possible bug in "uniform_in_sphere"). The interval generated by uniform_01 is designed to be the "half-open" interval [0,1). The asymmetry seems unnecessary. How about using the open interval (0,1). I can appreciate that perhaps efficiency is the reason for using the interval [0,1) if one is generating the random floating point numbers by setting the mantissa with a random bit stream. But, consider the following advantage to using (0,1): You would avoid a possible zerodivide in the "uniform_in_sphere" class. Here's my reasoning: Using the current "uniform_01" generator with the half open interval [0,1) the normal_distribution::operator() can return zero. Using my proposed "uniform_01" generator with the open interval (1,1) the normal_distribution::operator() will never return exactly zero. The "zero" return from normal_distribution::operator() could conceivably cause a zerodivide in "uniform_in_sphere". Question (3) -------------------------------------------------------- How about having a boost random number generator whose output would match that of Matlab's random number generator (both uniform and gaussian)? This would be useful in doing sanity tests when porting code to/from Matlab. Here's a link which gives some info on their generators: http://www.mathworks.com/support/solutions/data/8542.shtml

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Newbie missing a header for boost_date_time?
by dick.bridges＠tais.com 23 Jul '03

23 Jul '03

I must be missing one or more headers but I can't figure it out. Can someone help get me pointed in the right direction? <extract> #include "boost/date_time/gregorian/gregorian.hpp" #include "boost/date_time/posix_time/posix_time.hpp" using namespace boost::posix_time; using namespace boost::gregorian; date d(2002,Feb,1); </extract> <results> c:\boost\boost_1_30_0\boost\date_time\gregorian\greg_month.hpp(51) : warning C4244: 'argument' : conversion from 'boost::gregorian::greg_month::month_enum' to 'boost::CV::constrained_value<value_policies>::value_type', possible loss of data with [ value_policies=boost::gregorian::greg_month_policies ] c:\boost\boost_1_30_0\boost\date_time\gregorian\greg_date.hpp(77) : warning C4244: 'argument' : conversion from 'boost::gregorian::date_duration_rep' to 'boost::CV::constrained_value<value_policies>::value_type', possible loss of data with [ value_policies=boost::gregorian::greg_day_of_year_policies ] c:\boost\boost_1_30_0\boost\date_time\time_parsing.hpp(65) : warning C4267: 'initializing' : conversion from 'size_t' to 'int', possible loss of data c:\boost\boost_1_30_0\boost\iterator_adaptors.hpp(1409) : see reference to class template instantiation 'boost::filter_iterator_generator<Predicate,Iterator,Value,Reference,Pointer,Category,Distance>' being compiled c:\boost\boost_1_30_0\boost\date_time\time_duration.hpp(69) : warning C4244: 'return' : conversion from 'boost::date_time::time_resolution_traits<frac_sec_type,res,resolution_adjust,frac_digits>::fractional_seconds_type' to 'boost::date_time::time_duration<T,rep_type>::hour_type', possible loss of data with [ frac_sec_type=boost::int64_t, res=micro, resolution_adjust=0x0f4240, frac_digits=6 ] and [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c:\boost\boost_1_30_0\boost\date_time\time_duration.hpp(68) : while compiling class-template member function 'boost::date_time::time_duration<T,rep_type>::hour_type boost::date_time::time_duration<T,rep_type>::hours(void) const' with [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c: \boost\boost_1_30_0\boost\date_time\posix_time\posix_time_config.hpp(62) : see reference to class template instantiation 'boost::date_time::time_duration<T,rep_type>' being compiled with [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c:\boost\boost_1_30_0\boost\date_time\time_duration.hpp(74) : warning C4244: 'return' : conversion from 'boost::date_time::time_resolution_traits<frac_sec_type,res,resolution_adjust,frac_digits>::fractional_seconds_type' to 'boost::date_time::time_duration<T,rep_type>::min_type', possible loss of data with [ frac_sec_type=boost::int64_t, res=micro, resolution_adjust=0x0f4240, frac_digits=6 ] and [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c:\boost\boost_1_30_0\boost\date_time\time_duration.hpp(73) : while compiling class-template member function 'boost::date_time::time_duration<T,rep_type>::min_type boost::date_time::time_duration<T,rep_type>::minutes(void) const' with [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c:\boost\boost_1_30_0\boost\date_time\time_duration.hpp(79) : warning C4244: 'return' : conversion from 'boost::date_time::time_resolution_traits<frac_sec_type,res,resolution_adjust,frac_digits>::fractional_seconds_type' to 'boost::date_time::time_duration<T,rep_type>::sec_type', possible loss of data with [ frac_sec_type=boost::int64_t, res=micro, resolution_adjust=0x0f4240, frac_digits=6 ] and [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c:\boost\boost_1_30_0\boost\date_time\time_duration.hpp(78) : while compiling class-template member function 'boost::date_time::time_duration<T,rep_type>::sec_type boost::date_time::time_duration<T,rep_type>::seconds(void) const' with [ T=boost::posix_time::time_duration, rep_type=boost::posix_time::time_res_traits ] c:\boost\boost_1_30_0\boost\date_time\time_system_counted.hpp(39) : warning C4244: 'initializing' : conversion from 'boost::date_time::counted_time_rep<config>::int_type' to 'boost::date_time::gregorian_calendar_base<ymd_type_,date_int_type_>::date_int_type', possible loss of data with [ config=boost::posix_time::millisec_posix_time_system_config ] and [ ymd_type_=boost::gregorian::greg_year_month_day, date_int_type_=boost::date_time::int_adapter<unsigned long>::int_type ] c:\boost\boost_1_30_0\boost\date_time\time_system_counted.hpp(38) : while compiling class-template member function 'boost::date_time::counted_time_rep<config>::date_type boost::date_time::counted_time_rep<config>::date(void) const' with [ config=boost::posix_time::millisec_posix_time_system_config ] c:\boost\boost_1_30_0\boost\date_time\time_system_counted.hpp(72) : see reference to class template instantiation 'boost::date_time::counted_time_rep<config>' being compiled with [ config=boost::posix_time::millisec_posix_time_system_config ] c:\boost\boost_1_30_0\boost\date_time\time.hpp(48) : see reference to class template instantiation 'boost::date_time::counted_time_system<time_rep>' being compiled with [ time_rep=boost::posix_time::int64_time_rep ] c:\boost\boost_1_30_0\boost\date_time\posix_time\ptime.hpp(19) : see reference to class template instantiation 'boost::date_time::base_time<T,time_system>' being compiled with [ T=boost::posix_time::ptime, time_system=boost::posix_time::posix_time_system ] c:\boost\boost_1_30_0\boost\date_time\gregorian_calendar.ipp(120) : warning C4244: 'initializing' : conversion from 'unsigned long' to 'unsigned short', possible loss of data c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\streambuf(250) : while compiling class-template member function 'boost::date_time::gregorian_calendar_base<ymd_type_,date_int_type_>::ymd_type boost::date_time::gregorian_calendar_base<ymd_type_,date_int_type_>::from_day_number(boost::date_time::gregorian_calendar_base<ymd_type_,date_int_type_>::date_int_type)' with [ ymd_type_=boost::gregorian::greg_year_month_day, date_int_type_=boost::date_time::int_adapter<unsigned long>::int_type ] c: \boost\boost_1_30_0\boost\date_time\gregorian\greg_calendar.hpp(22) : see reference to class template instantiation 'boost::date_time::gregorian_calendar_base<ymd_type_,date_int_type_>' being compiled with [ ymd_type_=boost::gregorian::greg_year_month_day, date_int_type_=boost::date_time::int_adapter<unsigned long>::int_type ] c:\boost\boost_1_30_0\boost\date_time\gregorian_calendar.ipp(121) : warning C4244: 'initializing' : conversion from 'unsigned long' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\gregorian_calendar.ipp(125) : warning C4244: 'argument' : conversion from 'boost::date_time::gregorian_calendar_base<ymd_type_,date_int_type_>::date_int_type' to 'unsigned short', possible loss of data with [ ymd_type_=boost::gregorian::greg_year_month_day, date_int_type_=boost::date_time::int_adapter<unsigned long>::int_type ] c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(30) : warning C4244: 'argument' : conversion from 'int' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\gregorian\parsers.hpp(17) : see reference to function template instantiation 'date_type boost::date_time::parse_date<boost::gregorian::date>(const std::string &)' being compiled with [ date_type=boost::gregorian::date ] c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(31) : warning C4244: 'argument' : conversion from 'int' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(32) : warning C4244: 'argument' : conversion from 'int' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(54) : warning C4244: 'argument' : conversion from 'int' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\gregorian\parsers.hpp(22) : see reference to function template instantiation 'date_type boost::date_time::parse_undelimited_date<boost::gregorian::date>(const std::string &)' being compiled with [ date_type=boost::gregorian::date ] c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(55) : warning C4244: 'argument' : conversion from 'int' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(56) : warning C4244: 'argument' : conversion from 'int' to 'unsigned short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\time_parsing.hpp(103) : warning C4244: 'initializing' : conversion from 'int' to 'short', possible loss of data c:\boost\boost_1_30_0\boost\date_time\time_parsing.hpp(130) : see reference to function template instantiation 'time_duration boost::date_time::parse_undelimited_time_duration<time_duration>(const std::string &)' being compiled with [ time_duration=time_duration ] c: \boost\boost_1_30_0\boost\date_time\posix_time\time_parsers.hpp(26) : see reference to function template instantiation 'time_type boost::date_time::parse_iso_time<boost::posix_time::ptime>(const std::string &,char)' being compiled with [ time_type=boost::posix_time::ptime ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(147) : warning C4800: 'void *' : forcing value to bool 'true' or 'false' (performance warning) c:\boost\boost_1_30_0\boost\lexical_cast.hpp(146) : while compiling class-template member function 'bool boost::detail::lexical_stream<Target,Source>::operator <<(const Source &)' with [ Target=int, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(189) : see reference to class template instantiation 'boost::detail::lexical_stream<Target,Source>' being compiled with [ Target=int, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\date_time\date_parsing.hpp(28) : see reference to function template instantiation 'Target boost::lexical_cast<int,boost::token_iterator_generator<TokenizerFunc,Iterator,Type>::value_type>(Source)' being compiled with [ Target=int, TokenizerFunc=boost::char_delimiters_separator<char>, Iterator=std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator, Type=std::string, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\date_time\gregorian\parsers.hpp(17) : see reference to function template instantiation 'date_type boost::date_time::parse_date<boost::gregorian::date>(const std::string &)' being compiled with [ date_type=boost::gregorian::date ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(147) : error C2679: binary ' <<' : no operator found which takes a right-hand operand of type 'const boost::token_iterator_generator<TokenizerFunc,Iterator,Type>::value_type' (or there is no acceptable conversion) with [ TokenizerFunc=boost::char_delimiters_separator<char>, Iterator=std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator, Type=std::string ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(146) : while compiling class-template member function 'bool boost::detail::lexical_stream<Target,Source>::operator <<(const Source &)' with [ Target=unsigned short, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\lexical_cast.hpp(189) : see reference to class template instantiation 'boost::detail::lexical_stream<Target,Source>' being compiled with [ Target=unsigned short, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator,std::string>::value_type ] c:\boost\boost_1_30_0\boost\date_time\time_parsing.hpp(30) : see reference to function template instantiation 'Target boost::lexical_cast<unsigned short,boost::token_iterator_generator<TokenizerFunc,Iterator,Type>::value_type>(Source)' being compiled with [ Target=unsigned short, TokenizerFunc=boost::char_delimiters_separator<char>, Iterator=std::basic_string<char,std::char_traits<char>,std::allocator<char>>::const_iterator, Type=std::string, Source=boost::token_iterator_generator<boost::char_delimiters_separator<char>,std::basic_string<char,std::char_traits<char>,std::alloca tor<char>>::const_iterator,std::string>::value_type ] c: \boost\boost_1_30_0\boost\date_time\posix_time\time_parsers.hpp(18) : see reference to function template instantiation 'time_duration boost::date_time::parse_delimited_time_duration<boost::posix_time::time_duration>(const std::string &)' being compiled with [ time_duration=boost::posix_time::time_duration ] Build log was saved at "file://c:\dev\AuthStorm\Debug\BuildLog.htm" AuthStorm - 1 error(s), 18 warning(s) ---------------------- Done ---------------------- Build: 0 succeeded, 1 failed, 0 skipped </results>

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Is there a boost_date_time dll?
by dick.bridges＠tais.com 23 Jul '03

23 Jul '03

Development environment is .NET 2003 (i.e., VC7.1). I'm reasonably sure there were no errors when I built boost_1_30_0. \boost_1_30_0\libs\date_time\build\bin\boost_date_time.dll certainly exists - but it's a directory that contains a subdirectory (. \vc7\debug\runtime-link-dynamic) that contains a .CMD, .pdb and two .obj files. As the old saying goes: "I can see fine - I just don't understand what I'm looking at." I'm clearly having a "senior moment" but honestly: I searched boost.org, google.com and [even] altavista.com/web/adv. Any pointers to get me back on the right track would be appreciated.

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RE: [Boost-Users] Problem with regular expression
by James Zappia 23 Jul '03

23 Jul '03

You need to escape the backslash in your exp variable. Here's (1) that works. #include <iostream> #include <string> #include <boost/regex.hpp> using namespace std; using namespace boost; int main() { regex exp("\\s(ab)*", regbase::perl); // note the escaped \s here cmatch what; if ( regex_match(" ababab", what, exp) ) { string str = what[0]; cout << str << endl; } } Regards, James -----Original Message----- From: Javier de Acha [mailto:jdeacha@corest.com] Sent: Wednesday, July 23, 2003 10:50 AM To: Boost-Users(a)yahoogroups.com Subject: [Boost-Users] Problem with regular expression Hello, The next few lines doesn't work (1) with \s. But (2) works well [[:space:]] regbase::escape_in_lists dont func? Someone it knows because? Thanks Javier --------------------------------------------------------------------- (1) void main() { regex exp("\s(ab)*",regbase::perl); cmatch what; if(regex_match(" ababab", what, exp)) { string str = what[0]; //this fail } } ---------------------------------------------------------------------------- ---- (2) void main() { regex exp("[[:space:]](ab)*",regbase::perl); cmatch what; if(regex_match(" ababab", what, exp)) { string str = what[0]; //this succesfully match } } [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor ---------------------~--> Buy Ink Cartridges & Refill Kits for Your Epson at Myinks.com Free shipping on orders $50 or more to the US and Canada. http://www.c1tracking.com/l.asp?cid=5705&lp=home/epson.asp http://us.click.yahoo.com/brYXfA/_xWGAA/ySSFAA/EbFolB/TM ---------------------------------------------------------------------~-> Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

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RE: [Boost-Users] date-time library and ispunct() ambiguity under MSVC6
by Jeff Garland 23 Jul '03

23 Jul '03

Carl wrote: > I get the following compilation error for this simple program under MSVC6: > > ************** test.cpp****************** > #include <iostream> > #include "boost/date_time/gregorian/gregorian.hpp" > > int main() > { > using namespace std; > > cout << ispunct(',') << endl; > > return 0; > } > > ************************************ > > error: > --------------------Configuration: names_test - Win32 > Debug-------------------- > Compiling... > test.cpp > c:\documents and settings\waldbcar.waldbcar\my documents\my > projects\vc\test\names_test\test.cpp(8) : error C2668: 'ispunct' : > ambiguous call to overloaded function > Error executing cl.exe. > > test.obj - 1 error(s), 0 warning(s) > > been dumped into the global namespace by default. However, it seems like > the date-time library must be doing something like: > > namespace std > { > using ::ispunct; > } > > somewhere in its internals (or maybe just using something else that does?). This isn't done directly in date-time. I'm guessing that it might have something to do with 'tokenizer' library which date-time uses for parsing. See boost/token_function.hpp for some ispunct magic that is likely at the root of this issue. HTH, Jeff

1 0

weak_ptr
by Jason Winnebeck 23 Jul '03

23 Jul '03

Is there a reason why weak_ptr's cannot be compared with ==, or tested in a conditional? If I have two weak_ptr's, I thought it to be strange that I have to do: (w1.lock() == w2.lock()) And to test if a weak_ptr is the empty weak_ptr: if ( !(w1.lock()) ) which seems kind of awkward. Looking at the implementation, I see how the copy constructor is defined using lock. I understand what the comments are saying there. Perhaps there are some multithreaded issues that prevent equality testing I don't see. I would like the semantics that w1 and w2 compare to be equal whether or not the object they are pointing to are valid or not. I'm not sure if weak_ptrs become "empty" when the object they point to is destroyed (because there's no way to test for "emptyness" or "nullness" of a weak_ptr), but if they do I can see how the equality test can't work, but not the conditional test. Even so, why is there not an operator == provided that locks both weak_ptr? Is it acceptable (the documentation didn't make it clear to me), to use if ( w1.expired() ) to test if simply if w1 is "null" or "reset". What I am trying to do is have a "current" pointer that takes the value of something I want to be set (or note the fact that nothing is set), but I don't care if the object dies while that pointer is set -- in fact I don't want to keep it alive because I don't have an easy way to call reset on current were I to make it a shared_ptr. Jason

2 3

date-time library and ispunct() ambiguity under MSVC6
by Carl Waldbieser 23 Jul '03

23 Jul '03

I get the following compilation error for this simple program under MSVC6: ************** test.cpp****************** #include <iostream> #include "boost/date_time/gregorian/gregorian.hpp" int main() { using namespace std; cout << ispunct(',') << endl; return 0; } ************************************ error: --------------------Configuration: names_test - Win32 Debug-------------------- Compiling... test.cpp c:\documents and settings\waldbcar.waldbcar\my documents\my projects\vc\test\names_test\test.cpp(8) : error C2668: 'ispunct' : ambiguous call to overloaded function Error executing cl.exe. test.obj - 1 error(s), 0 warning(s) Normally, this sort of thing would not be a problem, as I typically would just be using the qualified std::ispunct() instead of a using directive. However, this problem cropped up when I was trying to use the date-time library in conjuction with the Spirit parsing library. Spirit implements some function by doing exactly what I did in the above sample-- using a using directive and then calling ispunct() unqualified. I am guessing the ratonale behind this might have something to do with the fact that under MSVC6, functions like ispunct() (and most or all of <ccytpe>) seem to have been dumped into the global namespace by default. However, it seems like the date-time library must be doing something like: namespace std { using ::ispunct; } somewhere in its internals (or maybe just using something else that does?). Anyway, it seems to be a shame that I can't get these two great libraries to work together on my compiler. Is there any chance that someone out there might have a solution? Carl Waldbieser waldbie<at-sign>attglobal.net

1 0

boost::date_time + setting system clock
by ericd 22 Jul '03

22 Jul '03

afternoon all, I was wondering if it is possible to set the clock using date_time. I been looking but have found no clue that it is so. From what I have seen so far, this library does a lot of cool stuff, and why not this. I am working on a little personal project that uses an ORB. The idea is to have all clocks synchronized. I have one machine that queries an atomic time server. After having done so it will call each machine and synchronize them. I am currently running a mix of Linux, Solaris, WIN NT 2000 and XP... and it freaks me out not to have them synchronized. Any help would be appreciated... Eric

1 0