// // detail/is_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_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