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more/io/opstream.h

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//  Copyright (C) 2000--2001  Petter Urkedal (petter.urkedal@matfys.lth.se)

//  This file is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.

//  This file is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.

//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

//  As a special exception, you may use this file as part of a free
//  software library without restriction.  Specifically, if other files
//  instantiate templates or use macros or inline functions from this
//  file, or you compile this file and link it with other files to
//  produce an executable, this file does not by itself cause the
//  resulting executable to be covered by the GNU General Public
//  License.  This exception does not however invalidate any other
//  reasons why the executable file might be covered by the GNU General
//  Public License.

//  $Id: opstream.h,v 1.1 2002/05/30 18:01:37 petter_urkedal Exp $


#include <ios>
#include <string>
#include <iosfwd>
#include <streambuf>

namespace more {
namespace io {

  /** \class basic_opstreambuf opstream.h more/io/opstream.h
   ** An IO stream buffer of an output pipe. */
  template<typename Char, typename Traits>
    struct basic_opstreambuf
        : std::basic_streambuf<Char, Traits>
    {
        typedef Char char_type;
        typedef Traits traits_type;
        typedef typename Traits::int_type int_type;
        typedef typename Traits::pos_type pos_type;
        typedef typename Traits::off_type off_type;

        basic_opstreambuf(char const*);
        virtual ~basic_opstreambuf();
        bool is_open() const { return m_fp; }

      protected:
        virtual int sync();
        virtual int_type overflow(int_type = traits_type::eof());

      private:
        static const int s_nbuf = 256;

        void *m_fp;
        Char *m_buf;
    };

  /** \class basic_opstream opstream.h more/io/opstream.h
   ** A stream buffer of an output pipe. */
  template< typename Char, typename Traits = std::char_traits<Char> >
    struct basic_opstream
        : std::basic_ostream<Char, Traits>
    {
        typedef basic_opstreambuf<Char, Traits> streambuf_type;

        basic_opstream(char const* cmd)
            : std::basic_ostream<Char, Traits>(m_buf=new streambuf_type(cmd))
        {
            if (!is_open()) setstate(std::ios_base::failbit);
        }

        ~basic_opstream() { delete m_buf; }

        bool is_open() const { return m_buf->is_open(); }

      private:
        streambuf_type* m_buf;
    };

  typedef basic_opstream<char> opstream;

}
}

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