Re: [Boost-bugs] [Boost C++ Libraries] #12218: Compilation error using input_seekable with gzip_decompressor()

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #12218: Compilation error using input_seekable with gzip_decompressor()
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-08-19 21:21:40

#12218: Compilation error using input_seekable with gzip_decompressor()
-------------------------+-------------------------------------------------
  Reporter:  anonymous   |      Owner:  turkanis
      Type:  Support     |     Status:  new
  Requests               |  Component:  iostreams
 Milestone:  To Be       |   Severity:  Problem
  Determined             |   Keywords:  GZIP, BZIP decompressor, seekable
   Version:  Boost       |  device
  1.58.0                 |
Resolution:              |
-------------------------+-------------------------------------------------
Changes (by viboes):

 * owner:   => turkanis
 * component:  None => iostreams


Old description:

> 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>          ]

New description:

 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>          ]
 }}}

--
-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/12218#comment:1>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.