id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12219	Compilation error using input_seekable with gzip_decompressor()	efrain.astudillo58@…	Jonathan Turkanis	"
Hello:

I am trying to use boost:iostream::input_seekable and GZIP decompressor. But, when the push function is called the compiler show me the error below. I posted the code too.


{{{
std::ifstream file(""file.tgz"");
boost::iostreams::filtering_streambuf<boost::iostreams::input_seekable> in;
in.push(boost::iostreams::gzip_decompressor());// here the error C2338, if I comment this line the error is gone
in.push(file);
}}}


C:\Users\Efrain\Documents\CAMsoftware\trunk\thirdparty\boost\boost/iostreams/chain.hpp(244): error C2338: (is_convertible<category, Mode>::value)
1>          C:\Users\Efrain\Documents\CAMsoftware\trunk\thirdparty\boost\boost/iostreams/chain.hpp(216) : see reference to function template instantiation 'void boost::iostreams::detail::chain_base<boost::iostreams::chain<Mode,Ch,Tr,Alloc>,Ch,Tr,Alloc,Mode>::push_impl<T>(const T &,std::streamsize,std::streamsize)' being compiled
1>          with
1>          [
1>              Mode=boost::iostreams::input_seekable
1>  ,            Ch=char
1>  ,            Tr=std::char_traits<char>
1>  ,            Alloc=std::allocator<char>
1>  ,            T=boost::iostreams::basic_bzip2_decompressor<std::allocator<char>>
1>          ]
1>          C:\Users\Efrain\Documents\CAMsoftware\trunk\thirdparty\boost\boost/iostreams/chain.hpp(216) : see reference to function template instantiation 'void boost::iostreams::detail::chain_base<boost::iostreams::chain<Mode,Ch,Tr,Alloc>,Ch,Tr,Alloc,Mode>::push_impl<T>(const T &,std::streamsize,std::streamsize)' being compiled
1>          with
1>          [
1>              Mode=boost::iostreams::input_seekable
1>  ,            Ch=char
1>  ,            Tr=std::char_traits<char>
1>  ,            Alloc=std::allocator<char>
1>  ,            T=boost::iostreams::basic_bzip2_decompressor<std::allocator<char>>
1>          ]
1>          C:\Users\Efrain\Documents\CAMsoftware\trunk\thirdparty\boost\boost/iostreams/chain.hpp(499) : see reference to function template instantiation 'void boost::iostreams::detail::chain_base<boost::iostreams::chain<Mode,Ch,Tr,Alloc>,Ch,Tr,Alloc,Mode>::push<T>(const T &,std::streamsize,std::streamsize,void *)' being compiled
1>          with
1>          [
1>              Mode=boost::iostreams::input_seekable
1>  ,            Ch=char
1>  ,            Tr=std::char_traits<char>
1>  ,            Alloc=std::allocator<char>
1>  ,            T=boost::iostreams::basic_bzip2_decompressor<std::allocator<char>>
1>          ]
1>          C:\Users\Efrain\Documents\CAMsoftware\trunk\thirdparty\boost\boost/iostreams/chain.hpp(499) : see reference to function template instantiation 'void boost::iostreams::detail::chain_base<boost::iostreams::chain<Mode,Ch,Tr,Alloc>,Ch,Tr,Alloc,Mode>::push<T>(const T &,std::streamsize,std::streamsize,void *)' being compiled
1>          with
1>          [
1>              Mode=boost::iostreams::input_seekable
1>  ,            Ch=char
1>  ,            Tr=std::char_traits<char>
1>  ,            Alloc=std::allocator<char>
1>  ,            T=boost::iostreams::basic_bzip2_decompressor<std::allocator<char>>
1>          ]
1>          C:\Users\Efrain\Documents\CAMsoftware\trunk\thirdparty\boost\boost/iostreams/chain.hpp(488) : see reference to function template instantiation 'void boost::iostreams::detail::chain_client<Self>::push_impl<T>(const T &,std::streamsize,std::streamsize)' being compiled
1>          with
1>          [
1>              Self=boost::iostreams::chain<boost::iostreams::input_seekable,char,std::char_traits<char>,std::allocator<char>>
1>  ,            T=boost::iostreams::basic_bzip2_decompressor<std::allocator<char>>
1>          ]
1>          C:\Users\Efrain\Documents\CAMsoftware\trunk\thirdparty\boost\boost/iostreams/chain.hpp(488) : see reference to function template instantiation 'void boost::iostreams::detail::chain_client<Self>::push_impl<T>(const T &,std::streamsize,std::streamsize)' being compiled
1>          with
1>          [
1>              Self=boost::iostreams::chain<boost::iostreams::input_seekable,char,std::char_traits<char>,std::allocator<char>>
1>  ,            T=boost::iostreams::basic_bzip2_decompressor<std::allocator<char>>
1>          ]
1>          source\c_archive.cpp(60) : see reference to function template instantiation 'void boost::iostreams::detail::chain_client<Self>::push<boost::iostreams::basic_bzip2_decompressor<std::allocator<char>>>(const T &,std::streamsize,std::streamsize,void *)' being compiled
1>          with
1>          [
1>              Self=boost::iostreams::chain<boost::iostreams::input_seekable,char,std::char_traits<char>,std::allocator<char>>
1>  ,            T=boost::iostreams::basic_bzip2_decompressor<std::allocator<char>>
1>          ]
1>          source\c_archive.cpp(60) : see reference to function template instantiation 'void boost::iostreams::detail::chain_client<Self>::push<boost::iostreams::basic_bzip2_decompressor<std::allocator<char>>>(const T &,std::streamsize,std::streamsize,void *)' being compiled
1>          with
1>          [
1>              Self=boost::iostreams::chain<boost::iostreams::input_seekable,char,std::char_traits<char>,std::allocator<char>>
1>  ,            T=boost::iostreams::basic_bzip2_decompressor<std::allocator<char>>
1>          ]
1>C:\Users\Efrain\Documents\CAMsoftware\trunk\thirdparty\boost\boost/iostreams/stream_buffer.hpp(68): error C2338: ( is_convertible< BOOST_DEDUCED_TYPENAME iostreams::category_of<T>::type, Mode >::value )
1>          C:\Users\Efrain\Documents\CAMsoftware\trunk\thirdparty\boost\boost/iostreams/chain.hpp(257) : see reference to class template instantiation 'boost::iostreams::stream_buffer<component_type,std::char_traits<char>,Alloc,Mode>' being compiled
1>          with
1>          [
1>              Alloc=std::allocator<char>
1>  ,            Mode=boost::iostreams::input_seekable
1>          ]"	Support Requests	new	To Be Determined	iostreams	Boost 1.58.0	Problem		GZIP, BZIP decompressor, seekable device