ceph/src/boost/boost/asio/dispatch.hpp

   1 //
   2 // dispatch.hpp
   3 // ~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 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_DISPATCH_HPP
  12 #define BOOST_ASIO_DISPATCH_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/async_result.hpp>
  20 #include <boost/asio/detail/type_traits.hpp>
  21 #include <boost/asio/execution_context.hpp>
  22 #include <boost/asio/is_executor.hpp>
  23
  24 #include <boost/asio/detail/push_options.hpp>
  25
  26 namespace boost {
  27 namespace asio {
  28
  29 /// Submits a completion token or function object for execution.
  30 /**
  31  * This function submits an object for execution using the object's associated
  32  * executor. The function object may be called from the current thread prior to
  33  * returning from <tt>dispatch()</tt>. Otherwise, it is queued for execution.
  34  *
  35  * This function has the following effects:
  36  *
  37  * @li Constructs a function object handler of type @c Handler, initialized
  38  * with <tt>handler(forward<CompletionToken>(token))</tt>.
  39  *
  40  * @li Constructs an object @c result of type <tt>async_result<Handler></tt>,
  41  * initializing the object as <tt>result(handler)</tt>.
  42  *
  43  * @li Obtains the handler's associated executor object @c ex by performing
  44  * <tt>get_associated_executor(handler)</tt>.
  45  *
  46  * @li Obtains the handler's associated allocator object @c alloc by performing
  47  * <tt>get_associated_allocator(handler)</tt>.
  48  *
  49  * @li Performs <tt>ex.dispatch(std::move(handler), alloc)</tt>.
  50  *
  51  * @li Returns <tt>result.get()</tt>.
  52  */
  53 template <BOOST_ASIO_COMPLETION_TOKEN_FOR(void()) CompletionToken>
  54 BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) dispatch(
  55     BOOST_ASIO_MOVE_ARG(CompletionToken) token);
  56
  57 /// Submits a completion token or function object for execution.
  58 /**
  59  * This function submits an object for execution using the specified executor.
  60  * The function object may be called from the current thread prior to returning
  61  * from <tt>dispatch()</tt>. Otherwise, it is queued for execution.
  62  *
  63  * This function has the following effects:
  64  *
  65  * @li Constructs a function object handler of type @c Handler, initialized
  66  * with <tt>handler(forward<CompletionToken>(token))</tt>.
  67  *
  68  * @li Constructs an object @c result of type <tt>async_result<Handler></tt>,
  69  * initializing the object as <tt>result(handler)</tt>.
  70  *
  71  * @li Obtains the handler's associated executor object @c ex1 by performing
  72  * <tt>get_associated_executor(handler)</tt>.
  73  *
  74  * @li Creates a work object @c w by performing <tt>make_work(ex1)</tt>.
  75  *
  76  * @li Obtains the handler's associated allocator object @c alloc by performing
  77  * <tt>get_associated_allocator(handler)</tt>.
  78  *
  79  * @li Constructs a function object @c f with a function call operator that
  80  * performs <tt>ex1.dispatch(std::move(handler), alloc)</tt> followed by
  81  * <tt>w.reset()</tt>.
  82  *
  83  * @li Performs <tt>Executor(ex).dispatch(std::move(f), alloc)</tt>.
  84  *
  85  * @li Returns <tt>result.get()</tt>.
  86  */
  87 template <typename Executor,
  88     BOOST_ASIO_COMPLETION_TOKEN_FOR(void()) CompletionToken
  89       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(Executor)>
  90 BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) dispatch(
  91     const Executor& ex,
  92     BOOST_ASIO_MOVE_ARG(CompletionToken) token
  93       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(Executor),
  94     typename enable_if<is_executor<Executor>::value>::type* = 0);
  95
  96 /// Submits a completion token or function object for execution.
  97 /**
  98  * @returns <tt>dispatch(ctx.get_executor(),
  99  * forward<CompletionToken>(token))</tt>.
 100  */
 101 template <typename ExecutionContext,
 102     BOOST_ASIO_COMPLETION_TOKEN_FOR(void()) CompletionToken
 103       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(
 104         typename ExecutionContext::executor_type)>
 105 BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) dispatch(
 106     ExecutionContext& ctx,
 107     BOOST_ASIO_MOVE_ARG(CompletionToken) token
 108       BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(
 109         typename ExecutionContext::executor_type),
 110     typename enable_if<is_convertible<
 111       ExecutionContext&, execution_context&>::value>::type* = 0);
 112
 113 } // namespace asio
 114 } // namespace boost
 115
 116 #include <boost/asio/detail/pop_options.hpp>
 117
 118 #include <boost/asio/impl/dispatch.hpp>
 119
 120 #endif // BOOST_ASIO_DISPATCH_HPP