1//
2// is_read_buffered.hpp
3// ~~~~~~~~~~~~~~~~~~~~
4//
5// Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6//
7// Distributed under the Boost Software License, Version 1.0. (See accompanying
8// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9//
10
11#ifndef BOOST_ASIO_IS_READ_BUFFERED_HPP
12#define BOOST_ASIO_IS_READ_BUFFERED_HPP
13
14#if defined(_MSC_VER) && (_MSC_VER >= 1200)
15# pragma once
16#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
17
18#include <boost/asio/detail/config.hpp>
19#include <boost/asio/buffered_read_stream_fwd.hpp>
20#include <boost/asio/buffered_stream_fwd.hpp>
21
22#include <boost/asio/detail/push_options.hpp>
23
24namespace boost {
25namespace asio {
26
27namespace detail {
28
29template <typename Stream>
30char is_read_buffered_helper(buffered_stream<Stream>* s);
31
32template <typename Stream>
33char is_read_buffered_helper(buffered_read_stream<Stream>* s);
34
35struct is_read_buffered_big_type { char data[10]; };
36is_read_buffered_big_type is_read_buffered_helper(...);
37
38} // namespace detail
39
40/// The is_read_buffered class is a traits class that may be used to determine
41/// whether a stream type supports buffering of read data.
42template <typename Stream>
43class is_read_buffered
44{
45public:
46#if defined(GENERATING_DOCUMENTATION)
47 /// The value member is true only if the Stream type supports buffering of
48 /// read data.
49 static const bool value;
50#else
51 BOOST_ASIO_STATIC_CONSTANT(bool,
52 value = sizeof(detail::is_read_buffered_helper((Stream*)0)) == 1);
53#endif
54};
55
56} // namespace asio
57} // namespace boost
58
59#include <boost/asio/detail/pop_options.hpp>
60
61#endif // BOOST_ASIO_IS_READ_BUFFERED_HPP
62