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null.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\iostreams\device\null.hpp
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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) // (C) Copyright 2004-2007 Jonathan Turkanis // 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/iostreams for documentation. // Inspired by Daryle Walker's nullbuf from his More I/O submission. #ifndef BOOST_IOSTREAMS_NULL_HPP_INCLUDED #define BOOST_IOSTREAMS_NULL_HPP_INCLUDED #if defined(_MSC_VER) && (_MSC_VER >= 1020) # pragma once #endif #include
#include
// openmode, streamsize. #include
namespace boost { namespace iostreams { template
class basic_null_device { public: typedef Ch char_type; struct category : public Mode, public device_tag, public closable_tag { }; std::streamsize read(Ch*, std::streamsize) { return 0; } std::streamsize write(const Ch*, std::streamsize n) { return n; } std::streampos seek( stream_offset, BOOST_IOS::seekdir, BOOST_IOS::openmode = BOOST_IOS::in | BOOST_IOS::out ) { return -1; } void close() { } void close(BOOST_IOS::openmode) { } }; template
struct basic_null_source : private basic_null_device
{ typedef Ch char_type; typedef source_tag category; using basic_null_device
::read; using basic_null_device
::close; }; typedef basic_null_source
null_source; typedef basic_null_source
wnull_source; template
struct basic_null_sink : private basic_null_device
{ typedef Ch char_type; typedef sink_tag category; using basic_null_device
::write; using basic_null_device
::close; }; typedef basic_null_sink
null_sink; typedef basic_null_sink
wnull_sink; } } // End namespaces iostreams, boost. #endif // #ifndef BOOST_IOSTREAMS_NULL_HPP_INCLUDED
null.hpp
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