ceph/src/boost/boost/asio/co_spawn.hpp

   1 //
   2 // co_spawn.hpp
   3 // ~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2019 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_CO_SPAWN_HPP
  12 #define BOOST_ASIO_CO_SPAWN_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
  20 #if defined(BOOST_ASIO_HAS_CO_AWAIT) || defined(GENERATING_DOCUMENTATION)
  21
  22 #include <boost/asio/awaitable.hpp>
  23 #include <boost/asio/execution_context.hpp>
  24 #include <boost/asio/is_executor.hpp>
  25
  26 #include <boost/asio/detail/push_options.hpp>
  27
  28 namespace boost {
  29 namespace asio {
  30 namespace detail {
  31
  32 template <typename T>
  33 struct awaitable_signature;
  34
  35 template <typename T, typename Executor>
  36 struct awaitable_signature<awaitable<T, Executor>>
  37 {
  38   typedef void type(std::exception_ptr, T);
  39 };
  40
  41 template <typename Executor>
  42 struct awaitable_signature<awaitable<void, Executor>>
  43 {
  44   typedef void type(std::exception_ptr);
  45 };
  46
  47 } // namespace detail
  48
  49 /// Spawn a new thread of execution.
  50 /**
  51  * The entry point function object @c f must have the signature:
  52  *
  53  * @code awaitable<void, E> f(); @endcode
  54  *
  55  * where @c E is convertible from @c Executor.
  56  */
  57 template <typename Executor, typename F,
  58     BOOST_ASIO_COMPLETION_TOKEN_FOR(typename detail::awaitable_signature<
  59       typename result_of<F()>::type>::type) CompletionToken
  60         BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(Executor)>
  61 BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken,
  62     typename detail::awaitable_signature<typename result_of<F()>::type>::type)
  63 co_spawn(const Executor& ex, F&& f,
  64     CompletionToken&& token
  65       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(Executor),
  66     typename enable_if<
  67       is_executor<Executor>::value
  68     >::type* = 0);
  69
  70 /// Spawn a new thread of execution.
  71 /**
  72  * The entry point function object @c f must have the signature:
  73  *
  74  * @code awaitable<void, E> f(); @endcode
  75  *
  76  * where @c E is convertible from @c ExecutionContext::executor_type.
  77  */
  78 template <typename ExecutionContext, typename F,
  79     BOOST_ASIO_COMPLETION_TOKEN_FOR(typename detail::awaitable_signature<
  80       typename result_of<F()>::type>::type) CompletionToken
  81         BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(
  82           typename ExecutionContext::executor_type)>
  83 BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken,
  84     typename detail::awaitable_signature<typename result_of<F()>::type>::type)
  85 co_spawn(ExecutionContext& ctx, F&& f,
  86     CompletionToken&& token
  87       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(
  88         typename ExecutionContext::executor_type),
  89     typename enable_if<
  90       is_convertible<ExecutionContext&, execution_context&>::value
  91     >::type* = 0);
  92
  93 } // namespace asio
  94 } // namespace boost
  95
  96 #include <boost/asio/detail/pop_options.hpp>
  97
  98 #include <boost/asio/impl/co_spawn.hpp>
  99
 100 #endif // defined(BOOST_ASIO_HAS_CO_AWAIT) || defined(GENERATING_DOCUMENTATION)
 101
 102 #endif // BOOST_ASIO_CO_SPAWN_HPP