// (C) Copyright Gennadiy Rozental 2002-2008. | |
// (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 : $RCSfile$ | |
// | |
// Version : $Revision: 49312 $ | |
// | |
// 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> | |
#endif // BOOST_NULLSTREAM_HPP_071894GER |