| // |
| // detail/is_executor.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2016 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_DETAIL_IS_EXECUTOR_HPP |
| #define ASIO_DETAIL_IS_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/detail/push_options.hpp" |
| |
| namespace asio { |
| namespace detail { |
| |
| struct executor_memfns_base |
| { |
| void context(); |
| void on_work_started(); |
| void on_work_finished(); |
| void dispatch(); |
| void post(); |
| void defer(); |
| }; |
| |
| template <typename T> |
| struct executor_memfns_derived |
| : T, executor_memfns_base |
| { |
| }; |
| |
| template <typename T, T> |
| struct executor_memfns_check |
| { |
| }; |
| |
| template <typename> |
| char (&context_memfn_helper(...))[2]; |
| |
| template <typename T> |
| char context_memfn_helper( |
| executor_memfns_check< |
| void (executor_memfns_base::*)(), |
| &executor_memfns_derived<T>::context>*); |
| |
| template <typename> |
| char (&on_work_started_memfn_helper(...))[2]; |
| |
| template <typename T> |
| char on_work_started_memfn_helper( |
| executor_memfns_check< |
| void (executor_memfns_base::*)(), |
| &executor_memfns_derived<T>::on_work_started>*); |
| |
| template <typename> |
| char (&on_work_finished_memfn_helper(...))[2]; |
| |
| template <typename T> |
| char on_work_finished_memfn_helper( |
| executor_memfns_check< |
| void (executor_memfns_base::*)(), |
| &executor_memfns_derived<T>::on_work_finished>*); |
| |
| template <typename> |
| char (&dispatch_memfn_helper(...))[2]; |
| |
| template <typename T> |
| char dispatch_memfn_helper( |
| executor_memfns_check< |
| void (executor_memfns_base::*)(), |
| &executor_memfns_derived<T>::dispatch>*); |
| |
| template <typename> |
| char (&post_memfn_helper(...))[2]; |
| |
| template <typename T> |
| char post_memfn_helper( |
| executor_memfns_check< |
| void (executor_memfns_base::*)(), |
| &executor_memfns_derived<T>::post>*); |
| |
| template <typename> |
| char (&defer_memfn_helper(...))[2]; |
| |
| template <typename T> |
| char defer_memfn_helper( |
| executor_memfns_check< |
| void (executor_memfns_base::*)(), |
| &executor_memfns_derived<T>::defer>*); |
| |
| template <typename T> |
| struct is_executor_class |
| : integral_constant<bool, |
| sizeof(context_memfn_helper<T>(0)) != 1 && |
| sizeof(on_work_started_memfn_helper<T>(0)) != 1 && |
| sizeof(on_work_finished_memfn_helper<T>(0)) != 1 && |
| sizeof(dispatch_memfn_helper<T>(0)) != 1 && |
| sizeof(post_memfn_helper<T>(0)) != 1 && |
| sizeof(defer_memfn_helper<T>(0)) != 1> |
| { |
| }; |
| |
| template <typename T> |
| struct is_executor |
| : conditional<is_class<T>::value, |
| is_executor_class<T>, |
| false_type>::type |
| { |
| }; |
| |
| } // namespace detail |
| } // namespace asio |
| |
| #include "asio/detail/pop_options.hpp" |
| |
| #endif // ASIO_DETAIL_IS_EXECUTOR_HPP |