boost/asio/is_read_buffered.hpp

   1 //
   2 // is_read_buffered.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2008 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/push_options.hpp>
  19
  20 #include <boost/asio/detail/push_options.hpp>
  21 #include <boost/config.hpp>
  22 #include <boost/asio/detail/pop_options.hpp>
  23
  24 #include <boost/asio/buffered_read_stream_fwd.hpp>
  25 #include <boost/asio/buffered_stream_fwd.hpp>
  26
  27 namespace boost {
  28 namespace asio {
  29
  30 namespace detail {
  31
  32 template <typename Stream>
  33 char is_read_buffered_helper(buffered_stream<Stream>* s);
  34
  35 template <typename Stream>
  36 char is_read_buffered_helper(buffered_read_stream<Stream>* s);
  37
  38 struct is_read_buffered_big_type { char data[10]; };
  39 is_read_buffered_big_type is_read_buffered_helper(...);
  40
  41 } // namespace detail
  42
  43 /// The is_read_buffered class is a traits class that may be used to determine
  44 /// whether a stream type supports buffering of read data.
  45 template <typename Stream>
  46 class is_read_buffered
  47 {
  48 public:
  49 #if defined(GENERATING_DOCUMENTATION)
  50   /// The value member is true only if the Stream type supports buffering of
  51   /// read data.
  52   static const bool value;
  53 #else
  54   BOOST_STATIC_CONSTANT(bool,
  55       value = sizeof(detail::is_read_buffered_helper((Stream*)0)) == 1);
  56 #endif
  57 };
  58
  59 } // namespace asio
  60 } // namespace boost
  61
  62 #include <boost/asio/detail/pop_options.hpp>
  63
  64 #endif // BOOST_ASIO_IS_READ_BUFFERED_HPP