1 // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
2 // (C) Copyright 2005-2007 Jonathan Turkanis
3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
6 // See http://www.boost.org/libs/iostreams for documentation.
8 #ifndef BOOST_IOSTREAMS_DETAIL_NON_BLOCKING_ADAPTER_HPP_INCLUDED
9 #define BOOST_IOSTREAMS_DETAIL_NON_BLOCKING_ADAPTER_HPP_INCLUDED
11 #include <boost/iostreams/detail/ios.hpp> // streamsize, seekdir, openmode.
12 #include <boost/iostreams/read.hpp>
13 #include <boost/iostreams/seek.hpp>
14 #include <boost/iostreams/traits.hpp>
15 #include <boost/iostreams/write.hpp>
17 namespace boost { namespace iostreams {
19 template<typename Device>
20 class non_blocking_adapter {
22 typedef typename char_type_of<Device>::type char_type;
24 : mode_of<Device>::type, device_tag
26 explicit non_blocking_adapter(Device& dev) : device_(dev) { }
27 std::streamsize read(char_type* s, std::streamsize n)
29 std::streamsize result = 0;
31 std::streamsize amt = iostreams::read(device_, s, n);
36 return result != 0 ? result : -1;
38 std::streamsize write(const char_type* s, std::streamsize n)
40 std::streamsize result = 0;
43 iostreams::write(device_, s + result, n - result);
48 std::streampos seek( stream_offset off, BOOST_IOS::seekdir way,
49 BOOST_IOS::openmode which =
50 BOOST_IOS::in | BOOST_IOS::out )
51 { return iostreams::seek(device_, off, way, which); }
53 non_blocking_adapter& operator=(const non_blocking_adapter&);
57 } } // End namespace iostreams.
59 #endif // #ifndef BOOST_IOSTREAMS_DETAIL_NON_BLOCKING_ADAPTER_HPP_INCLUDED