ceph/src/boost/libs/asio/include/boost/asio/is_write_buffered.hpp

   1 //
   2 // is_write_buffered.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2016 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_WRITE_BUFFERED_HPP
  12 #define BOOST_ASIO_IS_WRITE_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_stream_fwd.hpp>
  20 #include <boost/asio/buffered_write_stream_fwd.hpp>
  21
  22 #include <boost/asio/detail/push_options.hpp>
  23
  24 namespace boost {
  25 namespace asio {
  26
  27 namespace detail {
  28
  29 template <typename Stream>
  30 char is_write_buffered_helper(buffered_stream<Stream>* s);
  31
  32 template <typename Stream>
  33 char is_write_buffered_helper(buffered_write_stream<Stream>* s);
  34
  35 struct is_write_buffered_big_type { char data[10]; };
  36 is_write_buffered_big_type is_write_buffered_helper(...);
  37
  38 } // namespace detail
  39
  40 /// The is_write_buffered class is a traits class that may be used to determine
  41 /// whether a stream type supports buffering of written data.
  42 template <typename Stream>
  43 class is_write_buffered
  44 {
  45 public:
  46 #if defined(GENERATING_DOCUMENTATION)
  47   /// The value member is true only if the Stream type supports buffering of
  48   /// written data.
  49   static const bool value;
  50 #else
  51   BOOST_ASIO_STATIC_CONSTANT(bool,
  52       value = sizeof(detail::is_write_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_WRITE_BUFFERED_HPP