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66 lines
2.1 KiB
66 lines
2.1 KiB
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) |
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// (C) Copyright 2004-2007 Jonathan Turkanis |
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// Distributed under the Boost Software License, Version 1.0. (See accompanying |
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) |
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// See http://www.boost.org/libs/iostreams for documentation. |
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// Inspired by Daryle Walker's nullbuf from his More I/O submission. |
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#ifndef BOOST_IOSTREAMS_NULL_HPP_INCLUDED |
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#define BOOST_IOSTREAMS_NULL_HPP_INCLUDED |
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#if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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# pragma once |
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#endif |
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#include <boost/iostreams/categories.hpp> |
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#include <boost/iostreams/detail/ios.hpp> // openmode, streamsize. |
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#include <boost/iostreams/positioning.hpp> |
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namespace boost { namespace iostreams { |
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template<typename Ch, typename Mode> |
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class basic_null_device { |
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public: |
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typedef Ch char_type; |
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struct category |
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: public Mode, |
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public device_tag, |
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public closable_tag |
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{ }; |
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std::streamsize read(Ch*, std::streamsize) { return 0; } |
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std::streamsize write(const Ch*, std::streamsize n) { return n; } |
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std::streampos seek( stream_offset, BOOST_IOS::seekdir, |
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BOOST_IOS::openmode = |
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BOOST_IOS::in | BOOST_IOS::out ) |
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{ return -1; } |
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void close() { } |
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void close(BOOST_IOS::openmode) { } |
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}; |
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template<typename Ch> |
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struct basic_null_source : private basic_null_device<Ch, input> { |
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typedef Ch char_type; |
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typedef source_tag category; |
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using basic_null_device<Ch, input>::read; |
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using basic_null_device<Ch, input>::close; |
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}; |
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typedef basic_null_source<char> null_source; |
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typedef basic_null_source<wchar_t> wnull_source; |
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template<typename Ch> |
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struct basic_null_sink : private basic_null_device<Ch, output> { |
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typedef Ch char_type; |
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typedef sink_tag category; |
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using basic_null_device<Ch, output>::write; |
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using basic_null_device<Ch, output>::close; |
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}; |
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typedef basic_null_sink<char> null_sink; |
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typedef basic_null_sink<wchar_t> wnull_sink; |
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} } // End namespaces iostreams, boost. |
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#endif // #ifndef BOOST_IOSTREAMS_NULL_HPP_INCLUDED
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