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[serialization] problems extending existing archive type
by Kenny Riddile 14 Jun '09

14 Jun '09

I recently revisited a problem I was having trouble solving awhile ago, and I'm still having issues. I wish to create a new archive type that is simply an extension of xml_iarchive that takes an additional construction parameter and then be able to retrieve that value from the archive later. This new archive type is part of a static library. See attached Archive.hpp/cpp for my most recent attempt. I should also mention that BOOST_ALL_DYN_LINK is globally defined in my environment. This is the cause of the errors in output1.txt. After looking at archive/detail/decl.hpp, I was able to get my static library to compile by defining BOOST_ARCHIVE_SOURCE while compiling the static library. I then get the linker errors in output2.txt when trying to use the new archive type from an executable. I'm sure I'm just missing something simple, but I need some hand-holding here because I've been at this awhile. Thanks, Kenny Riddile #ifndef RS_REPOSITORY_ARCHIVE_HPP #define RS_REPOSITORY_ARCHIVE_HPP #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp> #include <rs/repository/RepositoryFwd.hpp> namespace rs { class InputArchive : public boost::archive::xml_iarchive_impl<InputArchive> , public boost::archive::detail::shared_ptr_helper { public: InputArchive( std::istream& is ); InputArchive( std::istream& is, Repository& repository ); Repository* GetRepository() const; template<class T> void load( T& t ) { boost::archive::xml_iarchive_impl<InputArchive>::load( t ); } private: friend class boost::archive::xml_iarchive_impl<InputArchive>; friend class boost::archive::basic_xml_iarchive<InputArchive>; friend class boost::archive::load_access; Repository* m_repository; }; typedef boost::archive::xml_oarchive OutputArchive; } // end namespace rs #endif // RS_REPOSITORY_ARCHIVE_HPP #include <rs/repository/Archive.hpp> #include <rs/repository/Repository.hpp> namespace rs { InputArchive::InputArchive( std::istream& is ) : boost::archive::xml_iarchive_impl<InputArchive>( is, 0 ) , m_repository( 0 ) { } InputArchive::InputArchive( std::istream& is, Repository& repository ) : boost::archive::xml_iarchive_impl<InputArchive>( is, 0 ) , m_repository( &repository ) { } Repository* InputArchive::GetRepository() const { return m_repository; } } // end namespace rs BOOST_SERIALIZATION_REGISTER_ARCHIVE( rs::InputArchive ) #include <boost/archive/impl/basic_xml_iarchive.ipp> #include <boost/archive/impl/xml_iarchive_impl.ipp> namespace boost { namespace archive { template class basic_xml_iarchive<rs::InputArchive>; template class xml_iarchive_impl<rs::InputArchive>; } // end namespace archive } // end namespace boost #define BOOST_ARCHIVE_CUSTOM_IARCHIVE_TYPES rs::InputArchive 1>------ Build started: Project: repository, Configuration: Debug Win32 ------ 1>Compiling... 1>Archive.cpp 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/basic_xml_iarchive.ipp(41) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::load_start' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/basic_xml_iarchive.ipp(74) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::load_end' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/basic_xml_iarchive.ipp(80) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::load_override' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/basic_xml_iarchive.ipp(86) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::load_override' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/basic_xml_iarchive.ipp(92) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::load_override' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/basic_xml_iarchive.ipp(98) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::load_override' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/basic_xml_iarchive.ipp(105) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::basic_xml_iarchive' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/basic_xml_iarchive.ipp(108) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::~basic_xml_iarchive' : definition of dllimport function not allowed 1>Warning: This header is deprecated. Please use: boost/spirit/include/classic_rule.hpp 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/xml_iarchive_impl.ipp(83) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::load' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/xml_iarchive_impl.ipp(114) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::load' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/xml_iarchive_impl.ipp(127) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::load' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/xml_iarchive_impl.ipp(140) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::load' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/xml_iarchive_impl.ipp(153) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::load_override' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/xml_iarchive_impl.ipp(160) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::init' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/xml_iarchive_impl.ipp(187) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::xml_iarchive_impl' : definition of dllimport function not allowed 1>C:\Documents and Settings\Administrator\My Documents\Development\development\third_party\boost\1_38_0\boost/archive/impl/xml_iarchive_impl.ipp(200) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::~xml_iarchive_impl' : definition of dllimport function not allowed 1>BinaryResourceWrapper.cpp 1>ArchiveWrapper.cpp 1>ResourceFileHandle.cpp 1>Repository.cpp 1>BinaryResource.cpp 1>Generating Code... 1>Build log was saved at "file://c:\Documents and Settings\Administrator\My Documents\Development\development\build\components\libs\repository\repository.dir\Debug\BuildLog.htm" 1>repository - 16 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 1 up-to-date, 0 skipped ========== 1>------ Build started: Project: repository_test_repository, Configuration: Debug Win32 ------ 1>Linking... 1>repository.lib(Repository.obj) : error LNK2005: "public: bool __thiscall boost::archive::detail::basic_iserializer::serialized_as_pointer(void)const " (?serialized_as_pointer@basic_iserializer@detail@archive@boost@@QBE_NXZ) already defined in boost_serialization-mt-gd.lib(boost_serialization-mt-gd.dll) 1>repository.lib(Repository.obj) : error LNK2005: "public: bool __thiscall boost::archive::detail::basic_oserializer::serialized_as_pointer(void)const " (?serialized_as_pointer@basic_oserializer@detail@archive@boost@@QBE_NXZ) already defined in boost_serialization-mt-gd.lib(boost_serialization-mt-gd.dll) 1>repository.lib(ArchiveWrapper.obj) : error LNK2005: "public: bool __thiscall boost::archive::detail::basic_iserializer::serialized_as_pointer(void)const " (?serialized_as_pointer@basic_iserializer@detail@archive@boost@@QBE_NXZ) already defined in boost_serialization-mt-gd.lib(boost_serialization-mt-gd.dll) 1>repository.lib(ArchiveWrapper.obj) : error LNK2005: "public: bool __thiscall boost::archive::detail::basic_oserializer::serialized_as_pointer(void)const " (?serialized_as_pointer@basic_oserializer@detail@archive@boost@@QBE_NXZ) already defined in boost_serialization-mt-gd.lib(boost_serialization-mt-gd.dll) 1>repository.lib(Archive.obj) : error LNK2005: "public: bool __thiscall boost::archive::detail::basic_iserializer::serialized_as_pointer(void)const " (?serialized_as_pointer@basic_iserializer@detail@archive@boost@@QBE_NXZ) already defined in boost_serialization-mt-gd.lib(boost_serialization-mt-gd.dll) 1>repository.lib(Archive.obj) : error LNK2005: "public: bool __thiscall boost::archive::detail::basic_oserializer::serialized_as_pointer(void)const " (?serialized_as_pointer@basic_oserializer@detail@archive@boost@@QBE_NXZ) already defined in boost_serialization-mt-gd.lib(boost_serialization-mt-gd.dll) 1> Creating library C:\Documents and Settings\Administrator\My Documents\Development\development\build\bin\Debug\repository_test_repository.lib and object C:\Documents and Settings\Administrator\My Documents\Development\development\build\bin\Debug\repository_test_repository.exp 1>repository.obj : warning LNK4217: locally defined symbol ?load_end@?$basic_xml_iarchive@VInputArchive@rs@@@archive@boost@@IAEXPBD@Z (protected: void __thiscall boost::archive::basic_xml_iarchive<class rs::InputArchive>::load_end(char const *)) imported in function "protected: void __thiscall boost::archive::basic_xml_iarchive<class rs::InputArchive>::load_override<class TestResource>(struct boost::serialization::nvp<class TestResource> const &,int)" (??$load_override@VTestResource@@@?$basic_xml_iarchive@VInputArchive@rs@@@archive@boost@@IAEXABU?$nvp@VTestResource@@@serialization@2@H@Z) 1>repository.obj : warning LNK4217: locally defined symbol ?load_start@?$basic_xml_iarchive@VInputArchive@rs@@@archive@boost@@IAEXPBD@Z (protected: void __thiscall boost::archive::basic_xml_iarchive<class rs::InputArchive>::load_start(char const *)) imported in function "protected: void __thiscall boost::archive::basic_xml_iarchive<class rs::InputArchive>::load_override<class TestResource>(struct boost::serialization::nvp<class TestResource> const &,int)" (??$load_override@VTestResource@@@?$basic_xml_iarchive@VInputArchive@rs@@@archive@boost@@IAEXABU?$nvp@VTestResource@@@serialization@2@H@Z) 1>repository.obj : warning LNK4217: locally defined symbol ??1?$xml_iarchive_impl@VInputArchive@rs@@@archive@boost@@IAE@XZ (protected: __thiscall boost::archive::xml_iarchive_impl<class rs::InputArchive>::~xml_iarchive_impl<class rs::InputArchive>(void)) imported in function "public: __thiscall rs::InputArchive::~InputArchive(void)" (??1InputArchive@rs@@QAE@XZ) 1>repository.obj : warning LNK4217: locally defined symbol ?load@?$xml_iarchive_impl@VInputArchive@rs@@@archive@boost@@IAEXAAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z (protected: void __thiscall boost::archive::xml_iarchive_impl<class rs::InputArchive>::load(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)) imported in function "public: void __thiscall rs::InputArchive::load<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)" (??$load@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@InputArchive@rs@@QAEXAAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) 1>repository.lib(Archive.obj) : error LNK2019: unresolved external symbol "public: __thiscall boost::archive::basic_xml_grammar<char>::basic_xml_grammar<char>(void)" (??0?$basic_xml_grammar@D@archive@boost@@QAE@XZ) referenced in function "protected: __thiscall boost::archive::xml_iarchive_impl<class boost::archive::naked_xml_iarchive>::xml_iarchive_impl<class boost::archive::naked_xml_iarchive>(class std::basic_istream<char,struct std::char_traits<char> > &,unsigned int)" (??0?$xml_iarchive_impl@Vnaked_xml_iarchive@archive@boost@@@archive@boost@@IAE@AAV?$basic_istream@DU?$char_traits@D@std@@@std@@I@Z) 1>repository.lib(Archive.obj) : error LNK2019: unresolved external symbol "public: void __thiscall boost::archive::basic_xml_grammar<char>::windup(class std::basic_istream<char,struct std::char_traits<char> > &)" (?windup@?$basic_xml_grammar@D@archive@boost@@QAEXAAV?$basic_istream@DU?$char_traits@D@std@@@std@@@Z) referenced in function "protected: __thiscall boost::archive::xml_iarchive_impl<class boost::archive::naked_xml_iarchive>::~xml_iarchive_impl<class boost::archive::naked_xml_iarchive>(void)" (??1?$xml_iarchive_impl@Vnaked_xml_iarchive@archive@boost@@@archive@boost@@IAE@XZ) 1>repository.lib(Archive.obj) : error LNK2019: unresolved external symbol "public: bool __thiscall boost::archive::basic_xml_grammar<char>::parse_start_tag(class std::basic_istream<char,struct std::char_traits<char> > &)" (?parse_start_tag@?$basic_xml_grammar@D@archive@boost@@QAE_NAAV?$basic_istream@DU?$char_traits@D@std@@@std@@@Z) referenced in function "protected: void __thiscall boost::archive::basic_xml_iarchive<class rs::InputArchive>::load_start(char const *)" (?load_start@?$basic_xml_iarchive@VInputArchive@rs@@@archive@boost@@IAEXPBD@Z) 1>repository.lib(Archive.obj) : error LNK2019: unresolved external symbol "public: bool __thiscall boost::archive::basic_xml_grammar<char>::parse_end_tag(class std::basic_istream<char,struct std::char_traits<char> > &)const " (?parse_end_tag@?$basic_xml_grammar@D@archive@boost@@QBE_NAAV?$basic_istream@DU?$char_traits@D@std@@@std@@@Z) referenced in function "protected: void __thiscall boost::archive::basic_xml_iarchive<class rs::InputArchive>::load_end(char const *)" (?load_end@?$basic_xml_iarchive@VInputArchive@rs@@@archive@boost@@IAEXPBD@Z) 1>repository.lib(Archive.obj) : error LNK2019: unresolved external symbol "public: bool __thiscall boost::archive::basic_xml_grammar<char>::parse_string(class std::basic_istream<char,struct std::char_traits<char> > &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)" (?parse_string@?$basic_xml_grammar@D@archive@boost@@QAE_NAAV?$basic_istream@DU?$char_traits@D@std@@@std@@AAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@5@@Z) referenced in function "protected: void __thiscall boost::archive::xml_iarchive_impl<class rs::InputArchive>::load(class std::basic_string<wchar_t,struct std::char_traits<wchar_t>,class std::allocator<wchar_t> > &)" (?load@?$xml_iarchive_impl@VInputArchive@rs@@@archive@boost@@IAEXAAV?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@@Z) 1>repository.lib(Archive.obj) : error LNK2019: unresolved external symbol "public: void __thiscall boost::archive::basic_xml_grammar<char>::init(class std::basic_istream<char,struct std::char_traits<char> > &)" (?init@?$basic_xml_grammar@D@archive@boost@@QAEXAAV?$basic_istream@DU?$char_traits@D@std@@@std@@@Z) referenced in function "protected: void __thiscall boost::archive::xml_iarchive_impl<class rs::InputArchive>::init(void)" (?init@?$xml_iarchive_impl@VInputArchive@rs@@@archive@boost@@IAEXXZ) 1>C:\Documents and Settings\Administrator\My Documents\Development\development\build\bin\Debug\repository_test_repository.exe : fatal error LNK1120: 6 unresolved externals 1>Build log was saved at "file://c:\Documents and Settings\Administrator\My Documents\Development\development\build\components\libs\repository\repository_test_repository.dir\Debug\BuildLog.htm" 1>repository_test_repository - 13 error(s), 4 warning(s) ========== Build: 0 succeeded, 1 failed, 4 up-to-date, 0 skipped ==========

2 2

[shared_ptr] Member functions as deallocators
by Michael Crawford 14 Jun '09

14 Jun '09

I'm using shared_ptr to hold a SceneManager object. In this particular case, I don't actually want the shared_ptr to have ownership of the SceneManager, but rather take advantage of it to insure that the SceneManager it holds is cleared when the containing object (a game's state) is destroyed. The deallocator needs to call SceneManager::clearScene, but it needs to call it on the held object, so the deallocator call would be essentially (pointer held in shared_ptr)->clearScene( ); Can anyone give me some guidance on how to accomplish this? Thanks, MBC

6 8

multi-thread server with boost::asio or boost::thread?
by Matheus Araújo Aguiar 14 Jun '09

14 Jun '09

Hello boost users, I'm currently working on a MMO game server and have been using the boost::asio to deal with sockets. For now i'm concerned with responsiveness and scalability, and have been thinking of two ways to achieve that. The first way would be multiple calls to io_service.run, each in a different thread, using the strand object to synchronize the callback handlers. The other way is to explicit use threads and locks with the boost::thread lib. So could you point me what would be the main differences (maybe advantages and disadvantages) between both ways? What way do you think is it better? I want to hear some opinions. Thanx in advance and best regards! -- Matheus Araújo Aguiar Computer Scientist matheus.pit(a)gmail.com

2 3

Re: [Boost-users] Does Boost.Test support std::wstring log
by Tan, Tom (Shanghai) 14 Jun '09

14 Jun '09

>> Is it possible to use Boost.Test macros with std::wstring directly like >> this: >> BOOST_TEST_MESSAGE(L"test log"); ? >Boost.Test internally uses std::ostream. So if you want above to work >you'll need to supply appropriate output method. > >Proper wide string support is not implemented yet. > >Gennadiy Thanks for the answer, Gennadiy. While I could wrap it with another layer, it'll be great if it's a built-in feature, so that I won't copy some additional code around while using boost.test, esp. that these days I started every little project with these 2 lines: #define BOOST_TEST_MODULE my #include <boost/test/unit_test.hpp> Is this decision out of convenience or any implementation obstacle. Specifically, what would be the problems if std::basic_ostream<Ch> is used instead?

2 1

[Spirit] seeking help with AST tree generation
by Slawomir Lisznianski 14 Jun '09

14 Jun '09

Hello, Using Boost Spirit, is it possible to write a grammar that, out of the box, generates the AST tree according to cases below: Case 1: ======= Input: 1 < 2 AND 3 < 4 OR 5 < 6 Resulting tree: OR / \ AND 5 < 6 / \ 1 < 2 3 < 4 Case 2: ======= Input: 1 < 2 AND (3 < 4 OR 5 < 6) Resulting tree: AND / \ 1 < 2 OR / \ 3 < 4 5 < 6 In other words, I want to honor the parenthesis for expression grouping. How would you recommend doing it? Thank you, Slaw

3 2

ASIO iostreams example -- help?
by Dave Steffen 14 Jun '09

14 Jun '09

Hi Folks, I'm just getting into ASIO, and am having problems with the examples. I'm trying out both the tcp::iostream examples and the (more basic?) synchronous TCP daytime clients in the tutorial. I have the server print the socket endpoint, which produces: 0.0.0.0:23421 (23421 being a randomly typed socket number, once I figured out that the '13' in the examples doesn't work because Linux reserves socket numbers up to 1024 for the kernel). I then run the client, providing 0.0.0.0:23421 on the commandline as the address to connect to. I get this: Host not found (authoritative) Does anyone know what that means? I know very little (read:nothing) about the tcp protocol, which is probably the real problem. :-) Thanks -- Dave Steffen Numerica Corporation (www.numerica.us <http://www.numerica.us/> ) 4850 Hahns Peak Drive, Suite 200 Loveland, Colorado 80538 main (970) 461-2000 direct (970) 461-2422 x227 fax (970) 461-2004 Email: dave.steffen(a)numerica.us

3 2

Simple question about boost::random
by Zachary Turner 13 Jun '09

13 Jun '09

I think I'm overlooking something very simple, but I'm trying to generate random numbers that are uniform over the open range of various data types. So I wrote this code: template<typename T> struct rand_type_range { typedef boost::numeric::bounds<T> bounds; static T generate() { static boost::uniform_int<T> range(bounds::lowest()+1, bounds::highest()-1); static boost::variate_generator<boost::minstd_rand&, boost::uniform_int<T> > generate(rng, range); return generate(); } }; Using this with anything other than a boost::uint32_t gives lots of warnings, although the results turn out correct. Looking at the warnings it seems the infrastructure is still trying to use boost::uint32_t's for everything, so am I missing something simple? 1>Q:\include\boost\1.39.0\boost/random/uniform_int.hpp(135) : warning C4244: '+=' : conversion from 'unsigned long' to 'unsigned short', possible loss of data 1> Q:\include\boost\1.39.0\boost/random/uniform_int.hpp(64) : see reference to function template instantiation 'unsigned short boost::uniform_int<IntType>::generate<Engine>(Engine &,unsigned short,unsigned short,unsigned short)' being compiled 1> with 1> [ 1> IntType=boost::uint16_t, 1> Engine=boost::random::detail::pass_through_engine<boost::random::detail::pass_through_engine<boost::random::linear_congruential<boost::int32_t,48271,0,2147483647,399268537> >> 1> ] 1> Q:\include\boost\1.39.0\boost/random/variate_generator.hpp(100) : see reference to function template instantiation 'unsigned short boost::uniform_int<IntType>::operator ()<boost::random::detail::pass_through_engine<UniformRandomNumberGenerator>>(Engine &)' being compiled 1> with 1> [ 1> IntType=boost::uint16_t, 1> UniformRandomNumberGenerator=boost::random::detail::pass_through_engine<boost::random::linear_congruential<boost::int32_t,48271,0,2147483647,399268537> >, 1> Engine=boost::random::detail::pass_through_engine<boost::random::detail::pass_through_engine<boost::random::linear_congruential<boost::int32_t,48271,0,2147483647,399268537> >> 1> ] 1> Q:\include\boost\1.39.0\boost/random/variate_generator.hpp(100) : while compiling class template member function 'unsigned short boost::variate_generator<Engine,Distribution>::operator ()(void)' 1> with 1> [ 1> Engine=boost::minstd_rand &, 1> Distribution=boost::uniform_int<boost::uint16_t> 1> ] 1> c:\dev\agent\windows\tests\bit_search.hpp(54) : see reference to class template instantiation 'boost::variate_generator<Engine,Distribution>' being compiled 1> with 1> [ 1> Engine=boost::minstd_rand &, 1> Distribution=boost::uniform_int<boost::uint16_t> 1> ] 1> c:\dev\agent\windows\tests\bit_search.hpp(52) : while compiling class template member function 'boost::uint16_t rand_type_value<T>::generate(void)' 1> with 1> [ 1> T=boost::uint16_t 1> ] 1> c:\dev\agent\windows\tests\bit_search.hpp(62) : see reference to class template instantiation 'rand_type_value<T>' being compiled 1> with 1> [ 1> T=boost::uint16_t 1> ] 1>Q:\include\boost\1.39.0\boost/random/detail/signed_unsigned_tools.hpp(64) : warning C4244: 'return' : conversion from 'base_unsigned' to 'unsigned short', possible loss of data 1> Q:\include\boost\1.39.0\boost/random/detail/signed_unsigned_tools.hpp(64) : while compiling class template member function 'unsigned short boost::random::detail::add<T1,T2>::operator ()(T1,T2)' 1> with 1> [ 1> T1=base_unsigned, 1> T2=unsigned short 1> ] 1> Q:\include\boost\1.39.0\boost/random/uniform_int.hpp(116) : see reference to class template instantiation 'boost::random::detail::add<T1,T2>' being compiled 1> with 1> [ 1> T1=base_unsigned, 1> T2=unsigned short 1> ] 1> Q:\include\boost\1.39.0\boost/random/uniform_int.hpp(64) : see reference to function template instantiation 'unsigned short boost::uniform_int<IntType>::generate<Engine>(Engine &,unsigned short,unsigned short,unsigned short)' being compiled 1> with 1> [ 1> IntType=boost::uint16_t, 1> Engine=boost::random::detail::pass_through_engine<boost::random::detail::pass_through_engine<boost::random::linear_congruential<boost::int32_t,48271,0,2147483647,399268537> >> 1> ] 1>Q:\include\boost\1.39.0\boost/random/uniform_smallint.hpp(79) : warning C4244: 'return' : conversion from 'long' to 'unsigned short', possible loss of data 1> Q:\include\boost\1.39.0\boost/random/uniform_int.hpp(150) : see reference to function template instantiation 'unsigned short boost::uniform_smallint<IntType>::operator ()<Engine>(Engine &)' being compiled 1> with 1> [ 1> IntType=unsigned short, 1> Engine=boost::random::detail::pass_through_engine<boost::random::detail::pass_through_engine<boost::random::linear_congruential<boost::int32_t,48271,0,2147483647,399268537> >> 1> ] 1>Linking... 1>LINK : c:\dev\agent\windows\tests\debug-winxp\Win32\bin\tests.exe not found or not built by the last incremental link; performing full link

2 1

unique_ptr?
by Robert Dailey 13 Jun '09

13 Jun '09

Hey guys, I remember a while back using boost::unique_ptr<Foo>, but I can't seem to find that class anymore. I'm using Boost 1.39. I noticed boost::interprocess::unique_ptr, but this isn't the same thing I'm looking for. Where can I find the boost::unique_ptr class? Is this in the sandbox somewhere? Thanks.

3 3

[PropertyTree] Rewrite - Please Review
by Sebastian Redl 13 Jun '09

13 Jun '09

Hi PropertyTree users, I have completed the main bulk of the property tree rewrite/cleanup. In the course of this, I have made the code standard-compliant (it previously used a std::list of an incomplete type, which is not, strictly speaking, valid), made it follow the claimed complexities (find() was O(n), although the docs said it's O(log n)), and revised the customization interface quite thoroughly. Inevitably, there were breaking changes in this process. I would ask everyone who has existing code using PropertyTree to look at these changes and tell me their best guess at how much effort it would be to update the code to conform with the new interface, and how I could make this easier. The development is still in a branch, so you need to check out the SVN branch http://svn.boost.org/svn/boost/branches/sredl_2009_05_proptree_update to try out the new version. The breaking changes are as follows: 1) Probably the most common change need: ptree::find() now returns the new type assoc_iterator (const_assoc_iterator for the const version) instead of iterator (const_iterator). This means that you need to change the type of the variable you capture the result with to assoc_iterator. It also means you need to compare the result of find() against ptree::not_found() instead of ptree::end(). You can get an iterator from an assoc_iterator by passing it to ptree::to_iterator(). The other projection direction is currently not supported, although it would be trivial to add. 2) The number and order of template arguments to basic_ptree has been changed. The old arguments were * Key comparison predicate * Key type * Path type * Data type * Translator type The new arguments are * Key type * Data type * Key comparison predicate (defaults to std::less<Key>) The old order prevented defaulting and wasn't very useful in general. The new order is consistent with std::map. The path and translator arguments have been removed to simplify the interface of basic_ptree. Equivalent functionality is available (see below). If you used your own instantiation of basic_ptree before, instead of simply using the (wi)ptree typedefs, you will have to adapt your code to the new order. If you used custom path and/or translator types, read on. 3) put and put_child previously had a final parameter 'bool do_not_replace'. I don't like boolean parameters, especially those whose name contains a negation. I removed the parameter, and replaced its functionality by a pair of new functions, add and add_child. If you previously called put or put_child passing true for do_not_replace, you must change these calls to add or add_child, respectively. If you ever passed false explicitly, you have to remove this parameter. 4) Using custom path types has changed. You can no longer create individual basic_ptree instantiations with custom path types. Instead, a key type has a fixed path type associated with it. I can bring this functionality back pretty easily if required, but I want to see use cases for this first. (Such things are why I make this call for reviews.) Less template parameters to ptree is good, in my opinion. To use a key type other than std::basic_string specializations, you have to specialize boost::property_tree::path_of for this key type. The path_of struct contains a single type called type, which is the path to use for this key type. The way paths are implemented has also changed thoroughly. Previously, you had to implement a const and a non-const variant of get_child, plus put_child (with do_not_replace making that effectively two functions too). These functions contained a lot of logic that really belonged into ptree, making implementing custom paths tedious and error-prone. The new interface requires you to implement four functions, but they're far simpler. The functions are described in ptree_fwd.hpp in C++0x concept syntax, but here's the gist: bool path::empty() const -> is the path empty? bool path::single() const -> does the path contain a single element? key_type path::reduce() -> chop off the first part of this path and return it (basically a pop_front that returns the value). std::string dump() const -> get a readable form of this path for exception messages; feel free to return "" here if you don't care. The new interface should be easy to implement, and the tree traversal is now where it belongs (in the internal implementation functions walk_path and force_path). 5) Using custom translators has changed. A ptree no longer has a fixed translator associated with it. Instead, you can supply a custom translator to every get_value/get/put_value/put operation or use the default, which depends on the tree's data type and the type you extract/insert. An example: ptree pt; pt.put("k1.k2", 100); // Uses the default translator for std::string+int. // Note: the explicit template parameter here will go away. float f = pt.get<float>("k1.k2", my_special_float_string_converter()); The tree's own data type is called the internal type, while the parameter/return type is called the external type. The default translator for a internal+external pair is set by specializing the boost::property_tree::translator_between struct. By default, PropertyTree supplies an id_translator for when the internal and external types are the same, and a stream_translator for converting between a basic_string and anything else. Together, they faithfully emulate the behavior of the old default translator. Writing a custom translator is easy. It's a class that provides two typedefs and two functions: typename internal_type -> the internal data type typename external_type -> the external data type optional<external_type> Tr::get_value(internal_type) -> convert from the internal to the external type, boost::none on failure optional<internal_type> Tr::put_value(external_type) -> convert from the external to the internal type, boost::none on failure That's it for the changes. The new version of property tree is not quite complete yet. I still need to polish the documentation a little and document the new extension mechanisms properly. I also need to clean up a little. Finally, the INI parser doesn't work at the moment. However, the main functionality (tested by property_tree_test) plus the XML, JSON and INFO parsers should all work now. Looking forward to your feedback. Sebastian

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date/time input facets - what am I doing wrong?
by Joe Nardone 13 Jun '09

13 Jun '09

I'm trying to get input facets working for dates and times using time_input_facet. (Boost 1.33.1 on RHEL5; upgrading is not an option at the moment) std::stringstream ss; ss.str("Feb 28 16:22:11 2009"); time_input_facet* tf = new time_input_facet("%b %e %H:%M:%S %Y"); ss.imbue(std::locale(std::locale::classic(), tf)); ss.exceptions(std::ios_base::failbit); ptime z; ss >> z; std::cout<< z << std::endl; This throws an exception - Parse failed. No match found for '' I figure I'm missing something simple. (when I try a different format: "%b %e %Y %H:%M:%S" for "Feb 28 2009 11:15:11" I get a "Year is out of valid range: 1400..10000" exception??) Thanks for any insight. joe

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