Chris@16: //  (C) Copyright Gennadiy Rozental 2002-2008.
Chris@16: //  (C) Copyright Daryle Walker 2000-2001. 
Chris@16: //  Distributed under the Boost Software License, Version 1.0.
Chris@16: //  (See accompanying file LICENSE_1_0.txt or copy at 
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: //  See http://www.boost.org/libs/test for the library home page.
Chris@16: //
Chris@16: //  File        : $RCSfile$
Chris@16: //
Chris@101: //  Version     : $Revision$
Chris@16: //
Chris@16: //  Description : simulate /dev/null stream
Chris@16: // ***************************************************************************
Chris@16: 
Chris@16: #ifndef BOOST_NULLSTREAM_HPP_071894GER
Chris@16: #define BOOST_NULLSTREAM_HPP_071894GER
Chris@16: 
Chris@16: #include <ostream>    // for std::basic_ostream
Chris@16: #include <streambuf>  // for std::basic_streambuf
Chris@16: #include <string>     // for std::char_traits
Chris@16: 
Chris@16: #include <boost/utility/base_from_member.hpp>
Chris@16: 
Chris@16: #include <boost/test/detail/suppress_warnings.hpp>
Chris@16: 
Chris@16: //____________________________________________________________________________//
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16: // ************************************************************************** //
Chris@16: // **************                 basic_nullbuf                ************** //
Chris@16: // ************************************************************************** //
Chris@16: //  Class for a buffer that reads nothing and writes to nothing.
Chris@16: //  Idea from an Usenet post by Tom <the_wid@my-deja.com> at
Chris@16: //  27 Oct 2000 14:06:21 GMT on comp.lang.c++.
Chris@16: 
Chris@16: template<typename CharType, class CharTraits = ::std::char_traits<CharType> >
Chris@16: class basic_nullbuf : public ::std::basic_streambuf<CharType, CharTraits> {
Chris@16:     typedef ::std::basic_streambuf<CharType, CharTraits>  base_type;
Chris@16: public:
Chris@16:     // Types
Chris@16:     typedef typename base_type::char_type    char_type;
Chris@16:     typedef typename base_type::traits_type  traits_type;
Chris@16:     typedef typename base_type::int_type     int_type;
Chris@16:     typedef typename base_type::pos_type     pos_type;
Chris@16:     typedef typename base_type::off_type     off_type;
Chris@16: 
Chris@16:     // Use automatic default constructor and destructor
Chris@16: 
Chris@16: protected:
Chris@16:     // The default implementations of the miscellaneous virtual
Chris@16:     // member functions are sufficient.
Chris@16: 
Chris@16:     // The default implementations of the input & putback virtual
Chris@16:     // member functions, being nowhere but EOF, are sufficient.
Chris@16: 
Chris@16:     // The output virtual member functions need to be changed to
Chris@16:     // accept anything without any problems, instead of being at EOF.
Chris@16:     virtual  ::std::streamsize  xsputn( char_type const* /*s*/, ::std::streamsize n )   { return n; } // "s" is unused
Chris@16:     virtual  int_type           overflow( int_type c = traits_type::eof() )         { return traits_type::not_eof( c ); }
Chris@16: };
Chris@16: 
Chris@16: typedef basic_nullbuf<char>      nullbuf;
Chris@16: typedef basic_nullbuf<wchar_t>  wnullbuf;
Chris@16: 
Chris@16: // ************************************************************************** //
Chris@16: // **************               basic_onullstream              ************** //
Chris@16: // ************************************************************************** //
Chris@16: //  Output streams based on basic_nullbuf.
Chris@16: 
Chris@16: #ifdef BOOST_MSVC
Chris@16: # pragma warning(push)
Chris@16: # pragma warning(disable: 4355) // 'this' : used in base member initializer list
Chris@16: #endif
Chris@16: 
Chris@16: template< typename CharType, class CharTraits = ::std::char_traits<CharType> >
Chris@16: class basic_onullstream : private boost::base_from_member<basic_nullbuf<CharType, CharTraits> >
Chris@16:                         , public ::std::basic_ostream<CharType, CharTraits> {
Chris@16:     typedef boost::base_from_member<basic_nullbuf<CharType, CharTraits> >   pbase_type;
Chris@16:     typedef ::std::basic_ostream<CharType, CharTraits>                      base_type;
Chris@16: public:
Chris@16:     // Constructor
Chris@16:     basic_onullstream() : pbase_type(), base_type( &this->pbase_type::member ) {}
Chris@16: };
Chris@16: 
Chris@16: #ifdef BOOST_MSVC
Chris@16: # pragma warning(default: 4355)
Chris@16: #endif
Chris@16: 
Chris@16: typedef basic_onullstream<char>      onullstream;
Chris@16: typedef basic_onullstream<wchar_t>  wonullstream;
Chris@16: 
Chris@16: }  // namespace boost
Chris@16: 
Chris@16: //____________________________________________________________________________//
Chris@16: 
Chris@16: #include <boost/test/detail/enable_warnings.hpp>
Chris@16: 
Chris@16: #endif  // BOOST_NULLSTREAM_HPP_071894GER