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