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-rw-r--r--lib/asio/associated_executor.hpp149
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diff --git a/lib/asio/associated_executor.hpp b/lib/asio/associated_executor.hpp
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-//
-// associated_executor.hpp
-// ~~~~~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
-//
-// Distributed under the Boost Software License, Version 1.0. (See accompanying
-// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-#ifndef ASIO_ASSOCIATED_EXECUTOR_HPP
-#define ASIO_ASSOCIATED_EXECUTOR_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include "asio/detail/type_traits.hpp"
-#include "asio/is_executor.hpp"
-#include "asio/system_executor.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace detail {
-
-template <typename>
-struct associated_executor_check
-{
- typedef void type;
-};
-
-template <typename T, typename E, typename = void>
-struct associated_executor_impl
-{
- typedef E type;
-
- static type get(const T&, const E& e) ASIO_NOEXCEPT
- {
- return e;
- }
-};
-
-template <typename T, typename E>
-struct associated_executor_impl<T, E,
- typename associated_executor_check<typename T::executor_type>::type>
-{
- typedef typename T::executor_type type;
-
- static type get(const T& t, const E&) ASIO_NOEXCEPT
- {
- return t.get_executor();
- }
-};
-
-} // namespace detail
-
-/// Traits type used to obtain the executor associated with an object.
-/**
- * A program may specialise this traits type if the @c T template parameter in
- * the specialisation is a user-defined type. The template parameter @c
- * Executor shall be a type meeting the Executor requirements.
- *
- * Specialisations shall meet the following requirements, where @c t is a const
- * reference to an object of type @c T, and @c e is an object of type @c
- * Executor.
- *
- * @li Provide a nested typedef @c type that identifies a type meeting the
- * Executor requirements.
- *
- * @li Provide a noexcept static member function named @c get, callable as @c
- * get(t) and with return type @c type.
- *
- * @li Provide a noexcept static member function named @c get, callable as @c
- * get(t,e) and with return type @c type.
- */
-template <typename T, typename Executor = system_executor>
-struct associated_executor
-{
- /// If @c T has a nested type @c executor_type, <tt>T::executor_type</tt>.
- /// Otherwise @c Executor.
-#if defined(GENERATING_DOCUMENTATION)
- typedef see_below type;
-#else // defined(GENERATING_DOCUMENTATION)
- typedef typename detail::associated_executor_impl<T, Executor>::type type;
-#endif // defined(GENERATING_DOCUMENTATION)
-
- /// If @c T has a nested type @c executor_type, returns
- /// <tt>t.get_executor()</tt>. Otherwise returns @c ex.
- static type get(const T& t,
- const Executor& ex = Executor()) ASIO_NOEXCEPT
- {
- return detail::associated_executor_impl<T, Executor>::get(t, ex);
- }
-};
-
-/// Helper function to obtain an object's associated executor.
-/**
- * @returns <tt>associated_executor<T>::get(t)</tt>
- */
-template <typename T>
-inline typename associated_executor<T>::type
-get_associated_executor(const T& t) ASIO_NOEXCEPT
-{
- return associated_executor<T>::get(t);
-}
-
-/// Helper function to obtain an object's associated executor.
-/**
- * @returns <tt>associated_executor<T, Executor>::get(t, ex)</tt>
- */
-template <typename T, typename Executor>
-inline typename associated_executor<T, Executor>::type
-get_associated_executor(const T& t, const Executor& ex,
- typename enable_if<is_executor<
- Executor>::value>::type* = 0) ASIO_NOEXCEPT
-{
- return associated_executor<T, Executor>::get(t, ex);
-}
-
-/// Helper function to obtain an object's associated executor.
-/**
- * @returns <tt>associated_executor<T, typename
- * ExecutionContext::executor_type>::get(t, ctx.get_executor())</tt>
- */
-template <typename T, typename ExecutionContext>
-inline typename associated_executor<T,
- typename ExecutionContext::executor_type>::type
-get_associated_executor(const T& t, ExecutionContext& ctx,
- typename enable_if<is_convertible<ExecutionContext&,
- execution_context&>::value>::type* = 0) ASIO_NOEXCEPT
-{
- return associated_executor<T,
- typename ExecutionContext::executor_type>::get(t, ctx.get_executor());
-}
-
-#if defined(ASIO_HAS_ALIAS_TEMPLATES)
-
-template <typename T, typename Executor = system_executor>
-using associated_executor_t = typename associated_executor<T, Executor>::type;
-
-#endif // defined(ASIO_HAS_ALIAS_TEMPLATES)
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // ASIO_ASSOCIATED_EXECUTOR_HPP