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[iostreams] Any simple examples on implementing a Symmetric_filter?
by eg 30 Nov '06

30 Nov '06

Hi all, I'm new to the iostreams library. It looks pretty cool. We have a bunch of existing objects which already have interfaces for reading and writing their state to a stream, e.g. MyWrite(std::ostream &out) and MyRead(std::istream &in) I've convinced myself I can filter these with iostreams, as I prototyped setting up a filtering stream with an existing gzip_compressor() filter, then reversed it with a gzip_decompressor(). Nice. Now, what I want to do is write my own filter, and thought that a symmetric_filter met my needs based on the description. Unfortunately, there are no simple examples in the tutorial section, and the documentation seems a bit weaker in this area. As a first kick at the can, reading the zlib/bzip implementations is a bit dense to pick out the nuances. Does anyone have an identity_filter example (based on symmetric_filter) that just copies input to output characters? ... or given some dumb c function like the following, how to construct a symmetric_filter using it. my_dumb_crypt(char* in, char* out, char *pwd, int len) { for (int i=0; i < len; ++i) // assumes in, out, and pwd are len long out[i] = in[i] ^ pwd[i]; } Thanks. eg

1 0

[Serialization] error C2027: use of undefined type 'boost::serialization::extended_type_info_null<T>'?
by Lawrence Spector 30 Nov '06

30 Nov '06

Hi all. I'm playing with the boost::serialization library, but having a compile issue, with a very obscure error message. It is as follows: Compiler: VC7.1 on Windows XP I get the following compile errors: Compiling... TestClass.cpp c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserialize r.hpp(142) : error C2027: use of undefined type 'boost::serialization::extended_type_info_null<T>' with [ T=CppTestClass ] c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserialize r.hpp(142) : see reference to class template instantiation 'boost::serialization::extended_type_info_null<T>' being compiled with [ T=CppTestClass ] c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserialize r.hpp(138) : while compiling class-template member function 'bool boost::archive::detail::iserializer<Archive,T>::is_polymorphic(void) const' with [ Archive=boost::archive::text_wiarchive, T=CppTestClass ] c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserialize r.hpp(375) : see reference to class template instantiation 'boost::archive::detail::iserializer<Archive,T>' being compiled with [ Archive=boost::archive::text_wiarchive, T=CppTestClass ] c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserialize r.hpp(369) : while compiling class-template member function 'void boost::archive::detail::load_non_pointer_type<Archive,T>::load_standard: :invoke(Archive &,T &)' with [ Archive=boost::archive::text_wiarchive, T=CppTestClass ] c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserialize r.hpp(425) : see reference to class template instantiation 'boost::archive::detail::load_non_pointer_type<Archive,T>::load_standard ' being compiled with [ Archive=boost::archive::text_wiarchive, T=CppTestClass ] c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserialize r.hpp(418) : while compiling class-template member function 'void boost::archive::detail::load_non_pointer_type<Archive,T>::invoke(Archive &,T &)' with [ Archive=boost::archive::text_wiarchive, T=CppTestClass ] c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserialize r.hpp(572) : see refe rence to class template instantiation 'boost::archive::detail::load_non_pointer_type<Archive,T>' being compiled with [ Archive=boost::archive::text_wiarchive, T=CppTestClass ] c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\basic_text_iarchi ve.hpp(64) : see reference to function template instantiation 'void boost::archive::load<Archive,T>(Archive &,T &)' being compiled with [ Archive=boost::archive::text_wiarchive, T=CppTestClass ] c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\text_wiarchive.hp p(68) : see reference to function template instantiation 'void boost::archive::basic_text_iarchive<Archive>::load_override<T>(T &,int)' being compiled with [ Archive=boost::archive::text_wiarchive, T=CppTestClass ] c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\interface_ iarchive.hpp(76) : see reference to function template instantiation 'void boost::archive::text_wiarchive_impl<Archive>::load_override<T>(T &,int)' being compiled with [ Archive=boost::archive::text_wiarchive, T=CppTestClass ] c:\Work\Sandbox\CppThroughCOM\CppThroughCOM\TestClass.cpp(67) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_iarchive<Archive>::operator >><CppTestClass>(T &)' being compiled with [ Archive=boost::archive::text_wiarchive, T=CppTestClass ] c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserialize r.hpp(142) : error C2146: syntax error : missing ';' before identifier 'typex' c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserialize r.hpp(142) : error C2065: 'typex' : undeclared identifier Here's my code: CppTestClass.hpp: #pragma once #include <boost/serialization/serialization.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/version.hpp> class CppTestClass { private: int m_x; public: CppTestClass(void); virtual ~CppTestClass(void); private: friend class boost::serialization::access; template<class Archive> void load(Archive & ar, const unsigned int version) { ar & version; ar & m_x; } template<class Archive> void save(Archive & ar, const unsigned int version) const { ar & version; ar & m_x; } public: friend std::wostream& operator<<(std::wostream& p_stream, const CppTestClass& p_testClass) { p_stream << p_testClass.m_x; return p_stream; } friend std::wistream& operator>>(std::wistream& p_stream, CppTestClass& p_testClass) { p_stream >> p_testClass.m_x; return p_stream; } BOOST_SERIALIZATION_SPLIT_MEMBER() public: void setX(int p_x) { m_x = p_x; } int getX() const { return m_x; } }; BOOST_CLASS_VERSION(CppTestClass, 1) In TestClass.cpp: This gives no compile errors: std::wstringstream ofs; boost::archive::text_woarchive oa(ofs); // write class instance to archive ofs << m_cppTestClass; ofs >> serData; However, this does: // create and open an archive for input std::wstringstream ifs; ifs << serData; boost::archive::text_wiarchive ia(ifs); // read class state from archive ia >> m_cppTestClass; //!!! errant line? Any ideas what's going on? Thanks in advance, Lawrence

1 0

lambda warning
by Noah Roberts 29 Nov '06

29 Nov '06

This is about the same function but has been changed to this definition: template < typename T > typename T::const_iterator first_pipe(T const& cont) { namespace l = boost::lambda; typedef esi::metafunc::dereference_type<typename T::value_type>::type value_type; return std::find_if(cont.begin(), cont.end(), (l::bind(&value_type::GetType, *(l::_1))) == DT_PIPE); } Reason being that the function would work ok with containers holding raw pointers but couldn't resolve for smart pointers like shared_ptr. This way works for both, but with shared_ptr I get the warning pasted at the end of this message. Gnu handles it fine even with -Wall and -pedantic. Is there a better way to do what I'm doing and get rid of the warning or do I just need to supress it? Thanks. 1>c:\boost\include\boost-1_33_1\boost\lambda\detail\operator_return_type_traits.hpp(240) : warning C4181: qualifier applied to reference type; ignored 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_traits.hpp(45) : see reference to class template instantiation 'boost::lambda::detail::contentsof_type<A>' being compiled 1> with 1> [ 1> A=const boost::shared_ptr<mock_pipe> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_traits.hpp(53) : see reference to class template instantiation 'boost::lambda::detail::IF_type_<T>' being compiled 1> with 1> [ 1> T=boost::lambda::detail::contentsof_type<const boost::shared_ptr<mock_pipe>> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\operator_return_type_traits.hpp(314) : see reference to class template instantiation 'boost::lambda::detail::IF_type<C,T,E>' being compiled 1> with 1> [ 1> C=true, 1> T=boost::lambda::detail::contentsof_type<const boost::shared_ptr<mock_pipe>>, 1> E=boost::lambda::detail::identity_mapping<boost::lambda::detail::unspecified> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\return_type_traits.hpp(88) : see reference to class template instantiation 'boost::lambda::return_type_1<Act,A>' being compiled 1> with 1> [ 1> Act=boost::lambda::other_action<boost::lambda::contentsof_action>, 1> A=const boost::shared_ptr<mock_pipe> & 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\operator_lambda_func_base.hpp(79) : see reference to class template instantiation 'boost::lambda::return_type_1_prot<Act,A>' being compiled 1> with 1> [ 1> Act=boost::lambda::other_action<boost::lambda::contentsof_action>, 1> A=const boost::shared_ptr<mock_pipe> & 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\operator_lambda_func_base.hpp(248) : see reference to class template instantiation 'boost::lambda::detail::unary_rt<Action,Bound,Open>' being compiled 1> with 1> [ 1> Action=boost::lambda::other_action<boost::lambda::contentsof_action>, 1> Bound=boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>, 1> Open=boost::tuples::tuple<const boost::shared_ptr<mock_pipe> &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_functor_base.hpp(191) : see reference to class template instantiation 'boost::lambda::lambda_functor_base<Act,Args>::sig<SigArgs>' being compiled 1> with 1> [ 1> Act=boost::lambda::other_action<boost::lambda::contentsof_action>, 1> Args=boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>, 1> SigArgs=boost::tuples::tuple<const boost::shared_ptr<mock_pipe> &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_functor_base.hpp(197) : see reference to class template instantiation 'boost::lambda::detail::deduce_non_ref_argument_types_<Args,SigArgs>' being compiled 1> with 1> [ 1> Args=boost::tuples::cons<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::lambda::contentsof_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>>,boost::tuples::detail::map_tuple_to_cons<boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>::type>, 1> SigArgs=boost::tuples::tuple<const boost::shared_ptr<mock_pipe> &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_functor_base.hpp(225) : see reference to class template instantiation 'boost::lambda::detail::deduce_non_ref_argument_types_<Args,SigArgs>' being compiled 1> with 1> [ 1> Args=boost::tuples::tuple<DT_TYPE (__thiscall mock_pipe::* const )(void) const,const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::lambda::contentsof_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>, 1> SigArgs=boost::tuples::tuple<const boost::shared_ptr<mock_pipe> &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_functor_base.hpp(398) : see reference to class template instantiation 'boost::lambda::detail::deduce_non_ref_argument_types<Args,SigArgs>' being compiled 1> with 1> [ 1> Args=boost::tuples::tuple<DT_TYPE (__thiscall mock_pipe::* const )(void) const,const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::lambda::contentsof_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>, 1> SigArgs=boost::tuples::tuple<const boost::shared_ptr<mock_pipe> &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_functor_base.hpp(164) : see reference to class template instantiation 'boost::lambda::lambda_functor_base<Act,Args>::sig<SigArgs>' being compiled 1> with 1> [ 1> Act=boost::lambda::action<2,boost::lambda::function_action<2>>, 1> Args=boost::tuples::tuple<DT_TYPE (__thiscall mock_pipe::* const )(void) const,const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::lambda::contentsof_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>, 1> SigArgs=boost::tuples::tuple<const boost::shared_ptr<mock_pipe> &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\lambda_functor_base.hpp(213) : see reference to class template instantiation 'boost::lambda::detail::deduce_argument_types_<Args,SigArgs>' being compiled 1> with 1> [ 1> Args=boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<DT_TYPE (__thiscall mock_pipe::* const )(void) const,const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::lambda::contentsof_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>>,const DT_TYPE,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>, 1> SigArgs=boost::tuples::tuple<const boost::shared_ptr<mock_pipe> &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\operator_lambda_func_base.hpp(60) : see reference to class template instantiation 'boost::lambda::detail::deduce_argument_types<Args,SigArgs>' being compiled 1> with 1> [ 1> Args=boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<DT_TYPE (__thiscall mock_pipe::* const )(void) const,const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::lambda::contentsof_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>>,const DT_TYPE,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>, 1> SigArgs=boost::tuples::tuple<const boost::shared_ptr<mock_pipe> &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\boost\include\boost-1_33_1\boost\lambda\detail\operator_lambda_func_base.hpp(222) : see reference to class template instantiation 'boost::lambda::detail::binary_rt<Action,Bound,Open>' being compiled 1> with 1> [ 1> Action=boost::lambda::relational_action<boost::lambda::equal_action>, 1> Bound=boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<DT_TYPE (__thiscall mock_pipe::* const )(void) const,const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::lambda::contentsof_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>>,const DT_TYPE,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>, 1> Open=boost::tuples::tuple<const boost::shared_ptr<mock_pipe> &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\program files\microsoft visual studio 8\vc\include\algorithm(87) : see reference to class template instantiation 'boost::lambda::lambda_functor_base<Act,Args>::sig<SigArgs>' being compiled 1> with 1> [ 1> Act=boost::lambda::relational_action<boost::lambda::equal_action>, 1> Args=boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<DT_TYPE (__thiscall mock_pipe::* const )(void) const,const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::lambda::contentsof_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>>,const DT_TYPE,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>, 1> SigArgs=boost::tuples::tuple<const boost::shared_ptr<mock_pipe> &,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type> 1> ] 1> c:\program files\microsoft visual studio 8\vc\include\algorithm(96) : see reference to function template instantiation '_InIt std::_Find_if<std::list<_Ty>::_Const_iterator<_Secure_validation>,_Pr>(_InIt,_InIt,_Pr)' being compiled 1> with 1> [ 1> _InIt=std::list<boost::shared_ptr<mock_pipe>>::_Const_iterator<false>, 1> _Ty=boost::shared_ptr<mock_pipe>, 1> _Secure_validation=false, 1> _Pr=boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::relational_action<boost::lambda::equal_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<DT_TYPE (__thiscall mock_pipe::* const )(void) const,const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::lambda::contentsof_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>>,const DT_TYPE,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>> 1> ] 1> c:\documents and settings\nroberts\my documents\visual studio 2005\projects\playground\playground\playground.cpp(44) : see reference to function template instantiation '_InIt std::find_if<std::list<_Ty>::_Const_iterator<_Secure_validation>,boost::lambda::lambda_functor<T>>(_InIt,_InIt,_Pr)' being compiled 1> with 1> [ 1> _InIt=std::list<boost::shared_ptr<mock_pipe>>::_Const_iterator<true>, 1> _Ty=boost::shared_ptr<mock_pipe>, 1> _Secure_validation=true, 1> T=boost::lambda::lambda_functor_base<boost::lambda::relational_action<boost::lambda::equal_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<DT_TYPE (__thiscall mock_pipe::* const )(void) const,const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::lambda::contentsof_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>>,const DT_TYPE,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>, 1> _Pr=boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::relational_action<boost::lambda::equal_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,boost::lambda::function_action<2>>,boost::tuples::tuple<DT_TYPE (__thiscall mock_pipe::* const )(void) const,const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::lambda::contentsof_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>>,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>>,const DT_TYPE,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>> 1> ] 1> c:\documents and settings\nroberts\my documents\visual studio 2005\projects\playground\playground\playground.cpp(65) : see reference to function template instantiation 'std::list<_Ty>::_Const_iterator<_Secure_validation> first_pipe<list1_t>(const T &)' being compiled 1> with 1> [ 1> _Ty=boost::shared_ptr<mock_pipe>, 1> _Secure_validation=true, 1> T=list1_t 1> ]

1 0

lambda help
by Noah Roberts 29 Nov '06

29 Nov '06

If I change the parameter of first_pipe to "T & cont" this code compiles. As it stands I get this error on the lambda part of the algorithm call. Error 1 error C2664: 'std::list<_Ty>::_Iterator<_Secure_validation>::_Iterator(const std::list<_Ty>::_Iterator<_Secure_validation> &)' : cannot convert parameter 1 from 'std::list<_Ty>::_Const_iterator<_Secure_validation>' to 'const std::list<_Ty>::_Iterator<_Secure_validation> &' How can I adjust my usage so that the lambda function construction resolves the correct constness and will accept the const iterator? Thanks....code follows. #include <iostream> #include <list> #include <boost/shared_ptr.hpp> #include <boost/lambda/lambda.hpp> #include <boost/lambda/bind.hpp> #include <boost/shared_ptr.hpp> namespace esi { namespace metafunc { template < typename T > struct dereference_type { typedef T type; }; template < typename T > struct dereference_type< T* > { typedef T type; }; template < typename T > struct dereference_type< boost::shared_ptr< T > > { typedef T type; }; } } template < typename T > typename T::iterator first_pipe(T const& cont) { namespace l = boost::lambda; typedef esi::metafunc::dereference_type<T::value_type>::type value_type; return std::find_if(cont.begin(), cont.end(), l::bind(&value_type::GetType, l::_1) == DT_PIPE); } enum DT_TYPE { DT_PUMP, DT_PIPE }; struct mock_pipe { bool pipe; mock_pipe(bool b) : pipe(b) {} DT_TYPE GetType() const { return pipe ? DT_PIPE : DT_PUMP; } }; void test_first_pipe() { typedef std::list<mock_pipe*> list1_t; std::list<mock_pipe*> l; l.push_back(new mock_pipe(false)); l.push_back(new mock_pipe(false)); l.push_back(new mock_pipe(false)); list1_t::iterator fit = first_pipe(l); } int main(void) { test_first_pipe(); }

1 1

Re: [Boost-users] Suggestion for boost`s smart pointers
by Sohail Somani 29 Nov '06

29 Nov '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of David Klein > > Sohail Somani wrote: > >> -----Original Message----- > >> From: boost-users-bounces(a)lists.boost.org > >> [mailto:boost-users-bounces@lists.boost.org] On Behalf Of mark cox > >> > >> wow, this seems like a great idea, a scoped_ptr with deleter > >> would be v.useful. > >> mark > >> > > > > I've been thinking something like (just something I hacked > together just > > now). Not sure if there is a nicer way. > > [snip] > +1 vote for this idea :) > > i actually kind of did this for my current project, > because i needed a custom deleter for scoped_ptr, > when shared_ptr was to much overhead... As did I, but it was not for performance but for readability. Shared pointers mean... Shared. Scoped don't.

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Re: [Boost-users] Suggestion for boost`s smart pointers
by Sohail Somani 29 Nov '06

29 Nov '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Maitre Bart > Sent: Wednesday, November 29, 2006 8:50 AM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users]Suggestion for boost`s smart pointers > > Richard Hadsell <hadsell <at> blueskystudios.com> writes: > > > David Klein wrote: > > [...] If you can implement the feature without adding any data > > members, fine. Otherwise, please create a new class. > > I agree too! > Why not calling it raii_ptr? I like this idea. Defaults to delete?

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Re: [Boost-users] Suggestion for boost`s smart pointers
by Sohail Somani 29 Nov '06

29 Nov '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Sohail Somani > > The deleter feature in shared_ptr is very useful for raii > > with any kind of > > resource (variables, functions, objects, etc.). Having it in > > scoped_ptr will > > offer the same advantage for noncopyable pointers. > > > > Thank you. > > +1 from me too but I think the reason is that people wanted > sizeof(scoped_ptr<T>) to be sizeof(T *) (or they don't want it to > change) A part solution could be a second template parameter but of course there can be no state.

4 3

serialize explicit template instantiation
by Jan Boehme 29 Nov '06

29 Nov '06

Hi, I want to use a non inline serialize method of a class. When instantiating it not explicitly the linker quits with undefined symbols. So I tried to instantiate it that way and it does not work anyway. Here is my code. Does anyone see what I've done wrong? I did also try to use export.hpp but it doesn't help too. Thank you very much, Jan. // Class.hpp #include <boost/archive/xml_oarchive.hpp> #include <boost/archive/xml_iarchive.hpp> #include <boost/serialization/string.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/utility.hpp> class CSerTest { std::string a_, b_, c_; friend class boost::serialization::access; template<class Archive> void serialize( Archive & ar, const unsigned int ); public: CSerTest(); }; BOOST_CLASS_VERSION(CSerTest, 1); // Class.cpp #include "Class.hpp" CSerTest::CSerTest() : a_("1"), b_("2"), c_("3") { } template<class Archive> void CSerTest::serialize( Archive & ar, const unsigned int ) { ar & BOOST_SERIALIZATION_NVP(a_) & BOOST_SERIALIZATION_NVP(b_) & BOOST_SERIALIZATION_NVP(c_); } // main.cpp #include <fstream> #include "Class.hpp" ///////////////////////// without effect //////////////////////////////////// template void CSerTest::serialize<boost::archive::xml_oarchive>(boost::archive::xml_oarchive&, unsigned int ); int main() { CSerTest instance; std::ofstream ofs( "out_file.txt" ); boost::archive::xml_oarchive oxa( ofs ); oxa << BOOST_SERIALIZATION_NVP(instance); } The linker (MS version 8) returns with: --- Creating library mytest.lib and object mytest.exp Main.obj : error LNK2019: unresolved external symbol "private: void __thiscall CSerTest::serialize<class boost::archive::xml_oarchive>(class boost::archive::xml_oarchive &,unsigned int)"(??$serialize@ Vxml_oarchive@archive@boost@@@CSerTest@@AAEXAAVxml_oarchive@archive@boost@@ I@Z) referenced in function "public: static void __cdeclboost::serialization::access::serialize<class boost::archive::xml_oarchive,class CSerTest>(class boost::archive::xml_oarchive &,class CSerTest &,unsigned int)"(??$serialize@ Vxml_oarchive@archive@boost@@VCSerTest@@@access@serialization@boost@@ SAXAAVxml_oarchive@archive@2@AAVCSerTest@@I@Z)mytest.exe : fatal error LNK1120: 1 unresolved externals

2 4

using lambda's pointer to member function and boost::function
by rodolfo＠rodsoft.org 29 Nov '06

29 Nov '06

Hi, I'm trying to put a simple lambda functor which uses pointer to member function into a boost::function like this: struct aux { int a() const { return 5; } }; int main() { function<int(const aux &)> f = &_1->*&aux::a; } But the compiler chokes at the assignment with the error: /usr/include/boost/function/function_template.hpp:119: error: cannot convert 'boost::lambda::detail::member_pointer_caller<int, const aux*, int (aux::*)()const>' to 'int' in return I think it should be able to convert the member_pointer_caller to boost::function, as its result (int) is the same of function's result, as well as its only argument is the one that makes the lambda functor valid. According to the documentation, something like this should work because it says that boost::function<int(int, int)> f = _1 + _2 works. Am I missing something? Thank you, Rodolfo Lima.

4 7

FW: Suggestion for boost`s smart pointers
by Sohail Somani 29 Nov '06

29 Nov '06

Hi, Please see the following email about additional template parameters for scoped_ptr. The quick hack I wrote for it is below (I've used this in previous project as well). I think it would be very useful to many users and wouldn't change any source using scoped_ptr. Thanks, Sohail ==== I've been thinking something like (just something I hacked together just now). Not sure if there is a nicer way. #include <string> #include <cstdio> #include <iostream> template<typename T> struct DeletingDeleter { DeletingDeleter(T * p) { delete p; std::cout << "DeletingDeleter" << std::endl; } }; struct FileCloser { FileCloser(FILE * f) { std::cout << "Closing file" << std::endl; fclose(f); } }; template<typename T, typename Deleter=DeletingDeleter<T> > struct scoped_ptr { scoped_ptr():p_(0){} scoped_ptr(T * p):p_(p){} ~scoped_ptr() { Deleter d(p_); } T * get() {return p_;} // regular stuff private: T * p_; }; typedef scoped_ptr<FILE,FileCloser> file_ptr; int main() { scoped_ptr<int> a; // maintain old interface scoped_ptr<int> b(new int(5)); file_ptr p(fopen("myfile.txt","w")); fprintf(p.get(),"Hello world!\n"); } > -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of David Klein > Sent: Tuesday, November 28, 2006 4:55 PM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] Suggestion for boost`s smart pointers > > Sohail Somani wrote: > >> -----Original Message----- > >> From: boost-users-bounces(a)lists.boost.org > >> [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > David Klein > >> > >> Sohail Somani wrote: > >> > >>>> -----Original Message----- > >>>> From: boost-users-bounces(a)lists.boost.org > >>>> [mailto:boost-users-bounces@lists.boost.org] On Behalf > Of mark cox > >>>> > >>>> wow, this seems like a great idea, a scoped_ptr with deleter > >>>> would be v.useful. > >>>> mark > >>>> > >>>> > >>> I've been thinking something like (just something I hacked > >>> > >> together just > >> > >>> now). Not sure if there is a nicer way. > >>> > >>> > > [snip] > > > >> +1 vote for this idea :) > >> > >> i actually kind of did this for my current project, > >> because i needed a custom deleter for scoped_ptr, > >> when shared_ptr was to much overhead... > >> > > > > As did I, but it was not for performance but for readability. Shared > > pointers mean... Shared. Scoped don't. > > _______________________________________________ > > Boost-users mailing list > > Boost-users(a)lists.boost.org > > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > > > > > yep exactly, > thatswhy i "ripped" scoped_ptr out of boost and added my > custom_deleter > stuff. > (i only *thought* about shared_ptr to do the job) > > so are there any objections about adding this feature to scoped_ptr? > > -- > regards dave > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

1 0