//  (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