// // execution/detail/void_receiver.hpp // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2021 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 BOOST_ASIO_EXECUTION_DETAIL_VOID_RECEIVER_HPP #define BOOST_ASIO_EXECUTION_DETAIL_VOID_RECEIVER_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include <boost/asio/detail/config.hpp> #include <boost/asio/traits/set_done_member.hpp> #include <boost/asio/traits/set_error_member.hpp> #include <boost/asio/traits/set_value_member.hpp> #include <boost/asio/detail/push_options.hpp> namespace boost { namespace asio { namespace execution { namespace detail { struct void_receiver { void set_value() BOOST_ASIO_NOEXCEPT { } template <typename E> void set_error(BOOST_ASIO_MOVE_ARG(E)) BOOST_ASIO_NOEXCEPT { } void set_done() BOOST_ASIO_NOEXCEPT { } }; } // namespace detail } // namespace execution namespace traits { #if !defined(BOOST_ASIO_HAS_DEDUCED_SET_VALUE_MEMBER_TRAIT) template <> struct set_value_member<boost::asio::execution::detail::void_receiver, void()> { BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); typedef void result_type; }; #endif // !defined(BOOST_ASIO_HAS_DEDUCED_SET_VALUE_MEMBER_TRAIT) #if !defined(BOOST_ASIO_HAS_DEDUCED_SET_ERROR_MEMBER_TRAIT) template <typename E> struct set_error_member<boost::asio::execution::detail::void_receiver, E> { BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); typedef void result_type; }; #endif // !defined(BOOST_ASIO_HAS_DEDUCED_SET_ERROR_MEMBER_TRAIT) #if !defined(BOOST_ASIO_HAS_DEDUCED_SET_DONE_MEMBER_TRAIT) template <> struct set_done_member<boost::asio::execution::detail::void_receiver> { BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); typedef void result_type; }; #endif // !defined(BOOST_ASIO_HAS_DEDUCED_SET_DONE_MEMBER_TRAIT) } // namespace traits } // namespace asio } // namespace boost #include <boost/asio/detail/pop_options.hpp> #endif // BOOST_ASIO_EXECUTION_DETAIL_VOID_RECEIVER_HPP