ceph/src/boost/boost/asio/experimental/redirect_error.hpp

   1 //
   2 // experimental/redirect_error.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2018 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_EXPERIMENTAL_REDIRECT_ERROR_HPP
  12 #define BOOST_ASIO_EXPERIMENTAL_REDIRECT_ERROR_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/detail/type_traits.hpp>
  20 #include <boost/system/error_code.hpp>
  21
  22 #include <boost/asio/detail/push_options.hpp>
  23
  24 namespace boost {
  25 namespace asio {
  26 namespace experimental {
  27
  28 /// Completion token type used to specify that an error produced by an
  29 /// asynchronous operation is captured to an error_code variable.
  30 /**
  31  * The redirect_error_t class is used to indicate that any error_code produced
  32  * by an asynchronous operation is captured to a specified variable.
  33  */
  34 template <typename CompletionToken>
  35 class redirect_error_t
  36 {
  37 public:
  38   /// Constructor.
  39   template <typename T>
  40   redirect_error_t(BOOST_ASIO_MOVE_ARG(T) completion_token,
  41       boost::system::error_code& ec)
  42     : token_(BOOST_ASIO_MOVE_CAST(T)(completion_token)),
  43       ec_(ec)
  44   {
  45   }
  46
  47 //private:
  48   CompletionToken token_;
  49   boost::system::error_code& ec_;
  50 };
  51
  52 /// Create a completion token to capture error_code values to a variable.
  53 template <typename CompletionToken>
  54 inline redirect_error_t<typename decay<CompletionToken>::type> redirect_error(
  55     CompletionToken&& completion_token, boost::system::error_code& ec)
  56 {
  57   return redirect_error_t<typename decay<CompletionToken>::type>(
  58       BOOST_ASIO_MOVE_CAST(CompletionToken)(completion_token), ec);
  59 }
  60
  61 } // namespace experimental
  62 } // namespace asio
  63 } // namespace boost
  64
  65 #include <boost/asio/detail/pop_options.hpp>
  66
  67 #include <boost/asio/experimental/impl/redirect_error.hpp>
  68
  69 #endif // BOOST_ASIO_EXPERIMENTAL_REDIRECT_ERROR_HPP