1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/ossrv/ossrv_pub/boost_apis/boost/iostreams/device/null.hpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,64 @@
     1.4 +// (C) Copyright Jonathan Turkanis 2004.
     1.5 +// Distributed under the Boost Software License, Version 1.0. (See accompanying
     1.6 +// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
     1.7 +
     1.8 +// See http://www.boost.org/libs/iostreams for documentation.
     1.9 +
    1.10 +// Inspired by Daryle Walker's nullbuf from his More I/O submission.
    1.11 +
    1.12 +#ifndef BOOST_IOSTREAMS_NULL_HPP_INCLUDED
    1.13 +#define BOOST_IOSTREAMS_NULL_HPP_INCLUDED
    1.14 +
    1.15 +#if defined(_MSC_VER) && (_MSC_VER >= 1020)
    1.16 +# pragma once
    1.17 +#endif
    1.18 +
    1.19 +#include <boost/iostreams/categories.hpp>
    1.20 +#include <boost/iostreams/detail/ios.hpp> // openmode, streamsize.
    1.21 +#include <boost/iostreams/positioning.hpp>
    1.22 +
    1.23 +namespace boost { namespace iostreams {
    1.24 +
    1.25 +template<typename Ch, typename Mode>
    1.26 +class basic_null_device {
    1.27 +public:
    1.28 +    typedef Ch char_type;
    1.29 +    struct category
    1.30 +        : public Mode,
    1.31 +          public device_tag,
    1.32 +          public closable_tag
    1.33 +        { };
    1.34 +    std::streamsize read(Ch*, std::streamsize) { return 0; }
    1.35 +    std::streamsize write(const Ch*, std::streamsize n) { return n; }
    1.36 +    stream_offset seek( stream_offset, BOOST_IOS::seekdir,
    1.37 +                        BOOST_IOS::openmode = 
    1.38 +                            BOOST_IOS::in | BOOST_IOS::out ) 
    1.39 +    { return -1; }
    1.40 +    void close(BOOST_IOS::openmode = BOOST_IOS::in | BOOST_IOS::out) { }
    1.41 +};
    1.42 +
    1.43 +template<typename Ch>
    1.44 +struct basic_null_source : private basic_null_device<Ch, input> {
    1.45 +    typedef Ch          char_type;
    1.46 +    typedef source_tag  category;
    1.47 +    using basic_null_device<Ch, input>::read;
    1.48 +    using basic_null_device<Ch, input>::close;
    1.49 +};
    1.50 +
    1.51 +typedef basic_null_source<char>     null_source;
    1.52 +typedef basic_null_source<wchar_t>  wnull_source;
    1.53 +
    1.54 +template<typename Ch>
    1.55 +struct basic_null_sink : private basic_null_device<Ch, output> {
    1.56 +    typedef Ch        char_type;
    1.57 +    typedef sink_tag  category;
    1.58 +    using basic_null_device<Ch, output>::write;
    1.59 +    using basic_null_device<Ch, output>::close;
    1.60 +};
    1.61 +
    1.62 +typedef basic_null_sink<char>     null_sink;
    1.63 +typedef basic_null_sink<wchar_t>  wnull_sink;
    1.64 +
    1.65 +} } // End namespaces iostreams, boost.
    1.66 +
    1.67 +#endif // #ifndef BOOST_IOSTREAMS_NULL_HPP_INCLUDED