//  (C) Copyright Gennadiy Rozental 2002-2005.

//  (C) Copyright Daryle Walker 2000-2001. 

//  Distributed under the Boost Software License, Version 1.0.

//  (See accompanying file LICENSE_1_0.txt or copy at 

//  http://www.boost.org/LICENSE_1_0.txt)

//  See http://www.boost.org/libs/test for the library home page.

//

//  File        : $RCSfile: nullstream.hpp,v $

//

//  Version     : $Revision: 1.4 $

//

//  Description : simulate /dev/null stream

// ***************************************************************************

#ifndef BOOST_NULLSTREAM_HPP_071894GER

#define BOOST_NULLSTREAM_HPP_071894GER

#include <ostream>    // for std::basic_ostream

#include <streambuf>  // for std::basic_streambuf

#include <string>     // for std::char_traits

#include <boost/utility/base_from_member.hpp>

#include <boost/test/detail/suppress_warnings.hpp>

//____________________________________________________________________________//

namespace boost {

// ************************************************************************** //

// **************                 basic_nullbuf                ************** //

// ************************************************************************** //

//  Class for a buffer that reads nothing and writes to nothing.

//  Idea from an Usenet post by Tom <the_wid@my-deja.com> at

//  27 Oct 2000 14:06:21 GMT on comp.lang.c++.

template<typename CharType, class CharTraits = ::std::char_traits<CharType> >

class basic_nullbuf : public ::std::basic_streambuf<CharType, CharTraits> {

    typedef ::std::basic_streambuf<CharType, CharTraits>  base_type;

public:

    // Types

    typedef typename base_type::char_type    char_type;

    typedef typename base_type::traits_type  traits_type;

    typedef typename base_type::int_type     int_type;

    typedef typename base_type::pos_type     pos_type;

    typedef typename base_type::off_type     off_type;

    // Use automatic default constructor and destructor

protected:

    // The default implementations of the miscellaneous virtual

    // member functions are sufficient.

    // The default implementations of the input & putback virtual

    // member functions, being nowhere but EOF, are sufficient.

    // The output virtual member functions need to be changed to

    // accept anything without any problems, instead of being at EOF.

    virtual  ::std::streamsize  xsputn( char_type const* /*s*/, ::std::streamsize n )   { return n; } // "s" is unused

    virtual  int_type           overflow( int_type c = traits_type::eof() )         { return traits_type::not_eof( c ); }

};

typedef basic_nullbuf<char>      nullbuf;

typedef basic_nullbuf<wchar_t>  wnullbuf;

// ************************************************************************** //

// **************               basic_onullstream              ************** //

// ************************************************************************** //

//  Output streams based on basic_nullbuf.

#ifdef BOOST_MSVC

# pragma warning(push)

# pragma warning(disable: 4355) // 'this' : used in base member initializer list

#endif

template< typename CharType, class CharTraits = ::std::char_traits<CharType> >

class basic_onullstream : private boost::base_from_member<basic_nullbuf<CharType, CharTraits> >

                        , public ::std::basic_ostream<CharType, CharTraits> {

    typedef boost::base_from_member<basic_nullbuf<CharType, CharTraits> >   pbase_type;

    typedef ::std::basic_ostream<CharType, CharTraits>                      base_type;

public:

    // Constructor

    basic_onullstream() : pbase_type(), base_type( &this->pbase_type::member ) {}

};

#ifdef BOOST_MSVC

# pragma warning(default: 4355)

#endif

typedef basic_onullstream<char>      onullstream;

typedef basic_onullstream<wchar_t>  wonullstream;

}  // namespace boost

//____________________________________________________________________________//

#include <boost/test/detail/enable_warnings.hpp>

// ***************************************************************************

//  Revision History :

//  

//  $Log: nullstream.hpp,v $

//  Revision 1.4  2005/02/20 08:27:08  rogeeff

//  This a major update for Boost.Test framework. See release docs for complete list of fixes/updates

//

//  Revision 1.3  2005/02/01 06:40:07  rogeeff

//  copyright update

//  old log entries removed

//  minor stilistic changes

//  depricated tools removed

//

//  Revision 1.2  2005/01/30 01:42:49  rogeeff

//  warnings suppressed

//

//  Revision 1.1  2005/01/22 18:21:40  rogeeff

//  moved sharable staff into utils

//

// ***************************************************************************

#endif  // BOOST_NULLSTREAM_HPP_071894GER