Hi all, I've been trying to compile the container_source example from the boost/iostreams documentation for a couple of days actually without success. It seems to me that tag dispatching fails to dispatch the default (for any_tag) implementation for optimal_buffer_size( ), imbue( ) and flush( ). I'm using Visual C++ 2005 SP1. I saw one unanswered posting about this exact problem early 2007, but on GCC. So I guess from this that I'm missing something obvious. Thanks for any help. Steph. Ps: code and build log following. #include "stdafx.h" #include <algorithm> // copy, min #include <iosfwd> // streamsize #include <boost/iostreams/categories.hpp> // source_tag #include <boost/iostreams/stream.hpp> #include <string> template<typename Container> class container_source; template<typename Container> class container_source { public: typedef typename Container::value_type char_type; typedef boost::iostreams::source_tag category; container_source(Container& container) : container_(container), pos_(0) { } std::streamsize read(char_type* s, std::streamsize n) { using namespace std; streamsize amt = static_cast<streamsize>(container_.size() - pos_); streamsize result = (min)(n, amt); if (result != 0) { std::copy( container_.begin() + pos_, container_.begin() + pos_ + result, s ); pos_ += result; return result; } else { return -1; // EOF } } Container& container() { return container_; } private: typedef typename Container::size_type size_type; Container& container_; size_type pos_; }; int main(int argc, char* argv[]) { using namespace std; typedef container_source<string> string_source; string input = "Hello World!\nThis is a test...\nShouldn't break\nthe assert"; string output; boost::iostreams::stream<string_source> in(input); getline(in, output); assert(input == output); return 0; } Build log: ------ Build started: Project: tstIostreams, Configuration: Debug Win32 ------ Compiling... tstIostreams.cpp e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\optimal_buffer_size.hpp(39) : error C2039: 'optimal_buffer_size' : is not a member of 'boost::iostreams::detail::optimal_buffer_size_impl<T>' with [ T=string_source ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\detail\streambuf\indirect_streambuf.hpp(162) : see reference to function template instantiation 'std::streamsize boost::iostreams::optimal_buffer_size<T>(const T &)' being compiled with [ T=string_source ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\detail\streambuf\indirect_streambuf.hpp(155) : while compiling class template member function 'void boost::iostreams::detail::indirect_streambuf<T,Tr,Alloc,Mode>::open(const T &,int,int)' with [ T=string_source, Tr=std::char_traits<char>, Alloc=std::allocator<char>, Mode=boost::iostreams::detail::io_mode_impl<1>::type ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\detail\streambuf\indirect_streambuf.hpp(195) : while compiling class template member function 'bool boost::iostreams::detail::indirect_streambuf<T,Tr,Alloc,Mode>::is_open(void) const' with [ T=string_source, Tr=std::char_traits<char>, Alloc=std::allocator<char>, Mode=boost::iostreams::detail::io_mode_impl<1>::type ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\stream_buffer.hpp(65) : see reference to class template instantiation 'boost::iostreams::detail::indirect_streambuf<T,Tr,Alloc,Mode>' being compiled with [ T=string_source, Tr=std::char_traits<char>, Alloc=std::allocator<char>, Mode=boost::iostreams::detail::io_mode_impl<1>::type ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\utility\base_from_member.hpp(69) : see reference to class template instantiation 'boost::iostreams::stream_buffer<T,Tr,Alloc>' being compiled with [ T=string_source, Tr=std::char_traits<char>, Alloc=std::allocator<char> ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\stream.hpp(75) : see reference to class template instantiation 'boost::base_from_member<MemberType>' being compiled with [ MemberType=boost::iostreams::stream_buffer<string_source,std::char_traits<char>,std::allocator<char>> ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\stream.hpp(112) : see reference to class template instantiation 'boost::iostreams::detail::stream_base<Device,Tr,Alloc>' being compiled with [ Device=string_source, Tr=std::char_traits<char>, Alloc=std::allocator<char> ] e:\data\tstcsharp\tstiostreams\tstiostreams\tstiostreams.cpp(52) : see reference to class template instantiation 'boost::iostreams::stream<Device>' being compiled with [ Device=string_source ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\imbue.hpp(38) : error C2039: 'imbue' : is not a member of 'boost::iostreams::detail::imbue_impl<T>' with [ T=container_source<std::string> ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\detail\adapter\concept_adapter.hpp(113) : see reference to function template instantiation 'void boost::iostreams::imbue<container_source<Container>,Locale>(T &,const Locale &)' being compiled with [ Container=std::string, Locale=std::locale, T=container_source<std::string> ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\detail\streambuf\indirect_streambuf.hpp(225) : see reference to function template instantiation 'void boost::iostreams::detail::concept_adapter<T>::imbue<std::locale>(const Locale &)' being compiled with [ T=string_source, Locale=std::locale ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\detail\streambuf\indirect_streambuf.hpp(223) : while compiling class template member function 'void boost::iostreams::detail::indirect_streambuf<T,Tr,Alloc,Mode>::imbue(const std::locale &)' with [ T=string_source, Tr=std::char_traits<char>, Alloc=std::allocator<char>, Mode=boost::iostreams::detail::io_mode_impl<1>::type ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\flush.hpp(41) : error C2039: 'flush' : is not a member of 'boost::iostreams::detail::flush_device_impl<T>' with [ T=container_source<std::string> ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\detail\adapter\concept_adapter.hpp(157) : see reference to function template instantiation 'bool boost::iostreams::flush<Device>(T &)' being compiled with [ Device=container_source<std::string>, T=container_source<std::string> ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\detail\adapter\concept_adapter.hpp(106) : see reference to function template instantiation 'bool boost::iostreams::detail::device_wrapper_impl<boost::iostreams::any_tag>::flush<container_source<Container>,std::basic_streambuf<_Elem,_Traits>>(Device &,Dummy *)' being compiled with [ Container=std::string, _Elem=char, _Traits=std::char_traits<char>, Device=container_source<std::string>, Dummy=std::basic_streambuf<char,std::char_traits<char>> ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\detail\adapter\concept_adapter.hpp(105) : while compiling class template member function 'bool boost::iostreams::detail::concept_adapter<T>::flush(std::basic_streambuf<_Elem,_Traits> *)' with [ T=string_source, _Elem=char, _Traits=std::char_traits<char> ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\detail\optional.hpp(35) : see reference to class template instantiation 'boost::iostreams::detail::concept_adapter<T>' being compiled with [ T=string_source ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\detail\optional.hpp(38) : see reference to class template instantiation 'boost::iostreams::detail::aligned_storage<T>::dummy_u' being compiled with [ T=boost::iostreams::detail::concept_adapter<string_source> ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\detail\optional.hpp(108) : see reference to class template instantiation 'boost::iostreams::detail::aligned_storage<T>' being compiled with [ T=boost::iostreams::detail::concept_adapter<string_source> ] e:\data\tstcsharp\boost_1_36_0\include\boost-1_36\boost\iostreams\detail\streambuf\indirect_streambuf.hpp(131) : see reference to class template instantiation 'boost::iostreams::detail::optional<T>' being compiled with [ T=boost::iostreams::detail::concept_adapter<string_source> ] tstIostreams - 3 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========