November 2006 - Boost-users - lists.preview.boost.org

Re: [Boost-users] serialize explicit template instantiation
by Reusser, Edward 30 Nov '06

30 Nov '06

This email was an eye popper for me because I have never had any luck declaring a template function in a header file and defining the implementation in a cpp file. I either get compilation/link errors, or very odd run-time problems. My understanding is that many compilers (of which mine, the MSVC 7.1 compiler) simply cannot handle this situation at all. I have always had to include the actual implementation of the template function inside the header file, which is a real pain. Note that this has nothing to do with the serialization per se. Are other people finding that newer compilers are finally able to handle this? I have several projects that I could improve by splitting the implementation code away from the headers. Ed -----Original Message----- From: Robert Ramey [mailto:ramey@rrsd.com] Sent: Wednesday, November 29, 2006 8:33 AM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] serialize explicit template instantiation I just compiled, linked and ran the following program on my system: vc 7.1 Boost 1.35 - HEAD There was no need to explicitly instantiate anything. Robert Ramey #include <boost/serialization/string.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/version.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 <boost/archive/xml_oarchive.hpp> #include <boost/archive/xml_iarchive.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> ///////////////////////// without effect //////////////////////////////////// //template void CSerTest::serialize<boost::archive::xml_oarchive>(boost::archive::xml_oa rchive&, unsigned int ); int main() { const CSerTest instance; std::ofstream ofs( "out_file.txt" ); boost::archive::xml_oarchive oxa( ofs ); oxa << BOOST_SERIALIZATION_NVP(instance); } The information contained in or attached to this email may be subject to the Export Administration Regulations (EAR), administered by the U.S. Department of Commerce, or the International Traffic in Arms Regulations (ITAR), administered by the U.S. Department of State, and may require an export license from the Commerce or State Department prior to its export. An export can include a release or disclosure to a foreign national inside or outside the United States. Include this notice with any reproduced portion of this information.

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Re: [Boost-users] more lambda issues
by Johan Torp 30 Nov '06

30 Nov '06

I haven't read all of your posts but I think your main problem is that boost bind stores arguments by value and takes them by reference. Because of this it requires lvalues as arguments. You can either add an internal bind to boost::shared_ptrs get() method which returns a raw pointer that can be bound or you can make a functor which accepts a raw pointer (given it won't outlive the shared_ptr). The latter requires you to create a temporary raw pointer when calling the functor since you need an lvalue. Consider the following: struct A{ int foo() {} }; int main() { boost::shared_ptr<A> sa; bind(&A::foo, bind(&boost::shared_ptr<A>::get,_1))(sa); A* pa=sa.get(); bind(&A::foo, _1)(pa); } Best Regards, Johan Torp boost-users-request(a)lists.boost.org wrote: >On 11/29/06, "JOAQUIN LOPEZ MU?Z" <joaquin(a)tid.es> wrote: > >First, thank you for your response. > > > >> std::cerr << "Value: " << >> (l::bind(&test_b::f, l::_1))(boost::ref(td)) << "\n"; >> >> > >Well, I tried putting ref on the other side but this works...my way didn't. > >Now I would need to find how to use this solution for my original >problem when td is actually a shared_ptr to an abstract base: > >boost::shared_ptr<test_b> td = boost::shared_ptr<test_b>(new test_d); > >This does not work: > >l::bind(l::bind(&test_b::f, l::_1), boost::ref(*l::_1))(td) > >Unlike boost::bind, lambda::bind doesn't work like this: > >l::bind(&test_b::f, l::_1)(td) > >This does but can't be used in an algorithm on a container holding >smart pointers: > >l::bind(&test_b::f, l::_1)(boost::ref(*td)) > >Interestingly, boost::bind has an operator == that will allow me to >compare the result of f() to a value just fine...I thought I needed >lambda for this. Boost::bind doesn't suffer from an inability to work >directly with smart pointers and doesn't require special magic to use >them vs. raw vs. non-ptr. So my original problem is solved by tossing >lambda out the airlock but it might be worthwhile to find a way to >accomplish a smart pointer member call with lambda for the future. > >So in the end, my problem is thus: > >std::find_if(cont.begin(), cont.end(), bind(&deref_val_type::f, _1) == 5); > >How is that accomplished with lambda if cont holds smart pointers? So >far I haven't found any way... > > > -- System Developer TouchTable AB Tel: +46 (0)31 773 68 12 johan.torp(a)touchtable.se

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Re: [Boost-users] odd msvc 7.1 compilation errors with mpl
by Küppers, Ben 30 Nov '06

30 Nov '06

craigp wrote: > For some reason, I can't get the IDE to compile BOOST_MPL_ASSERT. <snip> > anyone else seen something like this before?? all the mpl regression tests > compile fine via bjam (using msvc 7.1), so it appears ide-specific, > somehow... I am seeing the same behaviour. I also noticed that a release build seems to be immune to this problem. Also, the problem goes away as soon as the two character types are replaced by template classes and the character types are passed in later. #include <boost/type_traits/is_same.hpp> #include <boost/mpl/assert.hpp> template< class T, class U > struct my { BOOST_MPL_ASSERT( ( boost::is_same< T, U > ) ); // ok }; my<char,char> test; template< class T, class U > void f() { // ... BOOST_MPL_ASSERT( ( boost::is_same< T, U > ) ); // ok BOOST_MPL_ASSERT( ( boost::is_same< char, char > ) ); // ok }; int main() { f< char, char >(); BOOST_MPL_ASSERT( ( boost::is_same< char, char > ) ); // fail } -Ben This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you.

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gccxml compilation error with msc
by craigp 30 Nov '06

30 Nov '06

hello - i'm using gccxml (with pygccxml to generate python wrappers and fusion extension code), and under msc (7.1 in this case) i get compilation errors. it's a trivial fix, since gccxml attempts to emulate msc, it just needs another check in a couple files (naturally you'll probably want to rename 'CDP_USING_GCCXML'). i thought i'd send a patch, since i think others may try using gccxml (esp. since pygccxml is shaping up quite nicely). there are probably other places where this may be a problem, but for now, they're the only ones i've run into. HTH, --craig cvs -z9 diff -u -- and.hpp or.hpp (in directory D:\dev\boost.cvs\boost\boost\mpl\) Index: and.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/mpl/and.hpp,v retrieving revision 1.5 diff -u -r1.5 and.hpp --- and.hpp 2 Sep 2004 15:40:41 -0000 1.5 +++ and.hpp 30 Nov 2006 09:08:40 -0000 @@ -28,7 +28,7 @@ // 'or' and 'and' macros, see http://tinyurl.com/3et69; 'defined(and)' // has to be checked in a separate condition, otherwise GCC complains // about 'and' being an alternative token -#if defined(_MSC_VER) +#if defined(_MSC_VER) && !defined(CDP_USING_GCCXML) #if defined(and) # pragma push_macro("and") # undef and @@ -39,7 +39,7 @@ # define BOOST_MPL_PREPROCESSED_HEADER and.hpp # include <boost/mpl/aux_/include_preprocessed.hpp> -#if defined(_MSC_VER) +#if defined(_MSC_VER) && !defined(CDP_USING_GCCXML) #if defined(and) # pragma pop_macro("and") #endif Index: or.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/mpl/or.hpp,v retrieving revision 1.4 diff -u -r1.4 or.hpp --- or.hpp 2 Sep 2004 15:40:42 -0000 1.4 +++ or.hpp 30 Nov 2006 09:08:46 -0000 @@ -29,7 +29,7 @@ // 'or' and 'and' macros, see http://tinyurl.com/3et69; 'defined(or)' // has to be checked in a separate condition, otherwise GCC complains // about 'or' being an alternative token -#if defined(_MSC_VER) +#if defined(_MSC_VER) && !defined(CDP_USING_GCCXML) #if defined(or) # pragma push_macro("or") # undef or @@ -40,7 +40,7 @@ # define BOOST_MPL_PREPROCESSED_HEADER or.hpp # include <boost/mpl/aux_/include_preprocessed.hpp> -#if defined(_MSC_VER) +#if defined(_MSC_VER) && !defined(CDP_USING_GCCXML) #if defined(or) # pragma pop_macro("or") #endif ____________________________________________________________________________________ Want to start your own business? Learn how on Yahoo! Small Business. http://smallbusiness.yahoo.com/r-index

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Re: [Boost-users] Boost Lambda Newbie question
by Haroon Khan 30 Nov '06

30 Nov '06

Hi, I'm experimenting with the boost lambda library, and I wrote the following code, to go through the vector of numbers and print out statements if the number is greater than 5 or less than 5 int a[]={1,2,3,4,5,6,7,8,9,10,10,9,8,4,7,6,5,4,3,3,1}; std::vector<int> v(a,a+sizeof(a)/sizeof(int)); std::for_each ( v.begin() , v.end() , (if_(_1<5)[ std::cout<<var((boost::format("%d is less than 5\n")%_1).str()) ].else_[ std::cout<<var((boost::format("%d is greater than 5\n")%_1).str()) ]) ); The boost::basic_format::operator % code gives an assertion since the object that is being passed is the placeholder object, and not the current value. Is there a correct way of doing this? Thanks, Haroon

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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

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[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

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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> ]

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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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