Hello All, I have been trying to implement Sink device that I would like to use with boost::iostreams. I have used Sink class example and now I am trying to use that as my sink device for the stream object. char* file_name = "c:/devel/output/file_one.txt"; typedef container_sink std::iostream some_sink; stream my_file_stream; last line I get many errors as following: 1>c:\documents and settings\user\my documents\visual studio 2008\projects\filereaderwriter\sink.h(11) : error C2039: 'value_type' : is not a member of 'std::basic_iostream<_Elem,_Traits>' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> c:\program files\boost\boost_1_39\boost\iostreams\traits.hpp(176) : see reference to class template instantiation 'foobar::container_sink<Container>' being compiled 1> with 1> [ 1> Container=std::iostream 1> ] 1> c:\program files\boost\boost_1_39\boost\iostreams\traits.hpp(188) : see reference to class template instantiation 'boost::iostreams::detail::member_char_type<T>' being compiled 1> with 1> [ 1> T=foobar::container_sinkstd::iostream 1> ] 1> c:\program files\boost\boost_1_39\boost\iostreams\stream.hpp(108) : see reference to class template instantiation 'boost::iostreams::char_type_of<T>' being compiled 1> with 1> [ 1> T=some_sink 1> ] 1>c:\documents and settings\user\my documents\visual studio 2008\projects\filereaderwriter\sink.h(11) : error C2146: syntax error : missing ';' before identifier 'char_type' 1>c:\documents and settings\user\my documents\visual studio 2008\projects\filereaderwriter\sink.h(11) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>c:\documents and settings\user\my documents\visual studio 2008\projects\filereaderwriter\sink.h(11) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>c:\documents and settings\user\my documents\visual studio 2008\projects\filereaderwriter\sink.h(23) : error C2061: syntax error : identifier 'char_type' 1>c:\program files\boost\boost_1_39\boost\iostreams\traits.hpp(176) : error C2039: 'char_type' : is not a member of 'foobar::container_sink<Container>' 1> with 1> [ 1> Container=std::iostream 1> ] 1>c:\program files\boost\boost_1_39\boost\iostreams\traits.hpp(176) : error C2146: syntax error : missing ';' before identifier 'type' 1>c:\program files\boost\boost_1_39\boost\iostreams\traits.hpp(176) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>c:\program files\boost\boost_1_39\boost\iostreams\traits.hpp(176) : error C2208: 'boost::type' : no members defined using this type 1>c:\program files\boost\boost_1_39\boost\iostreams\traits.hpp(176) : fatal error C1903: unable to recover from previous error(s); stopping compilation Thanks,