127 lines
2.9 KiB
C++
127 lines
2.9 KiB
C++
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//
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// detail/is_executor.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_IS_EXECUTOR_HPP
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#define ASIO_DETAIL_IS_EXECUTOR_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#include "asio/detail/type_traits.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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struct executor_memfns_base
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{
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void context();
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void on_work_started();
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void on_work_finished();
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void dispatch();
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void post();
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void defer();
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};
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template <typename T>
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struct executor_memfns_derived
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: T, executor_memfns_base
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{
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};
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template <typename T, T>
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struct executor_memfns_check
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{
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};
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template <typename>
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char (&context_memfn_helper(...))[2];
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template <typename T>
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char context_memfn_helper(
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executor_memfns_check<
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void (executor_memfns_base::*)(),
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&executor_memfns_derived<T>::context>*);
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template <typename>
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char (&on_work_started_memfn_helper(...))[2];
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template <typename T>
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char on_work_started_memfn_helper(
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executor_memfns_check<
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void (executor_memfns_base::*)(),
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&executor_memfns_derived<T>::on_work_started>*);
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template <typename>
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char (&on_work_finished_memfn_helper(...))[2];
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template <typename T>
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char on_work_finished_memfn_helper(
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executor_memfns_check<
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void (executor_memfns_base::*)(),
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&executor_memfns_derived<T>::on_work_finished>*);
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template <typename>
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char (&dispatch_memfn_helper(...))[2];
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template <typename T>
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char dispatch_memfn_helper(
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executor_memfns_check<
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void (executor_memfns_base::*)(),
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&executor_memfns_derived<T>::dispatch>*);
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template <typename>
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char (&post_memfn_helper(...))[2];
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template <typename T>
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char post_memfn_helper(
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executor_memfns_check<
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void (executor_memfns_base::*)(),
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&executor_memfns_derived<T>::post>*);
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template <typename>
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char (&defer_memfn_helper(...))[2];
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template <typename T>
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char defer_memfn_helper(
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executor_memfns_check<
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void (executor_memfns_base::*)(),
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&executor_memfns_derived<T>::defer>*);
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template <typename T>
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struct is_executor_class
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: integral_constant<bool,
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sizeof(context_memfn_helper<T>(0)) != 1 &&
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sizeof(on_work_started_memfn_helper<T>(0)) != 1 &&
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sizeof(on_work_finished_memfn_helper<T>(0)) != 1 &&
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sizeof(dispatch_memfn_helper<T>(0)) != 1 &&
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sizeof(post_memfn_helper<T>(0)) != 1 &&
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sizeof(defer_memfn_helper<T>(0)) != 1>
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{
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};
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template <typename T>
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struct is_executor
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: conditional<is_class<T>::value,
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is_executor_class<T>,
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false_type>::type
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{
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_DETAIL_IS_EXECUTOR_HPP
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