comparison DEPENDENCIES/generic/include/boost/iostreams/device/null.hpp @ 16:2665513ce2d3

Add boost headers

+// (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 <boost/iostreams/categories.hpp>
+#include <boost/iostreams/detail/ios.hpp> // openmode, streamsize.
+#include <boost/iostreams/positioning.hpp>
+
+namespace boost { namespace iostreams {
+
+template<typename Ch, typename Mode>
+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<typename Ch>
+struct basic_null_source : private basic_null_device<Ch, input> {
+    typedef Ch          char_type;
+    typedef source_tag  category;
+    using basic_null_device<Ch, input>::read;
+    using basic_null_device<Ch, input>::close;
+};
+
+typedef basic_null_source<char>     null_source;
+typedef basic_null_source<wchar_t>  wnull_source;
+
+template<typename Ch>
+struct basic_null_sink : private basic_null_device<Ch, output> {
+    typedef Ch        char_type;
+    typedef sink_tag  category;
+    using basic_null_device<Ch, output>::write;
+    using basic_null_device<Ch, output>::close;
+};
+
+typedef basic_null_sink<char>     null_sink;
+typedef basic_null_sink<wchar_t>  wnull_sink;
+
+} } // End namespaces iostreams, boost.
+
+#endif // #ifndef BOOST_IOSTREAMS_NULL_HPP_INCLUDED