Re: [Boost-users] iostreams: streambuf class fails to compile on type check

Subject: Re: [Boost-users] iostreams: streambuf class fails to compile on type check
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2016-03-12 22:27:39

AMDG

On 03/12/2016 07:48 PM, Dan Bloomquist wrote:
> I'm trying to insert my own stream buffer into a boost stream. Here is
> the code
> <http://hostcode.sourceforge.net/view/5044>
> 
> At the top are two arbitrary streambuf derived classes I copied from the
> web that are said to work with the std::stream. They don't work either.
> 
> My work is in the rtf namespace. In main there is a test with my device,
> file_source, and std::ifstream derived, they all work. Then I've tried
> the likes of:
> 
>     rtf::basic_stream< char, char_array_buffer > io_4( input );
>     rtf::basic_stream< char, outbuf > io_4( input );
> and the one I want to work:
>     rtf::basic_stream< char, rtf::rtf_stream_buffer > io_4( input );
> 
> they all fail at:    { BOOST_STATIC_ASSERT(is_std_io<T>::value); }
> line 66 in concept_adapter.hpp. All the classes are derived from
> std::basic_streambuf which is on the list #ifndef
> BOOST_IOSTREAMS_NO_STREAM_TEMPLATES
> 
> And I could not find it defined with agent ransack So, I seem to be
> missing something fundamental and just don't know what it could be.
> 

  It fails because char_array_buffer doesn't meet
the requirements of boost::iostreams::stream.

T - A CopyConstructible model of one of the Device concepts

http://www.boost.org/doc/libs/1_60_0/libs/iostreams/doc/guide/generic_streams.html#stream_params

In particular, it is not CopyConstructible.

In Christ,
Steven Watanabe