142 lines
3.2 KiB
C++
142 lines
3.2 KiB
C++
//
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// experimental/detail/channel_payload.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2023 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 BOOST_ASIO_EXPERIMENTAL_DETAIL_CHANNEL_PAYLOAD_HPP
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#define BOOST_ASIO_EXPERIMENTAL_DETAIL_CHANNEL_PAYLOAD_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 <boost/asio/detail/config.hpp>
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#include <boost/asio/detail/type_traits.hpp>
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#include <boost/system/error_code.hpp>
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#include <boost/asio/experimental/detail/channel_message.hpp>
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#if defined(BOOST_ASIO_HAS_STD_VARIANT)
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# include <variant>
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#endif // defined(BOOST_ASIO_HAS_STD_VARIANT)
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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namespace experimental {
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namespace detail {
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template <typename... Signatures>
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class channel_payload;
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template <typename R>
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class channel_payload<R()>
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{
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public:
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explicit channel_payload(channel_message<R()>)
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{
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}
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template <typename Handler>
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void receive(Handler& handler)
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{
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BOOST_ASIO_MOVE_OR_LVALUE(Handler)(handler)();
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}
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};
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template <typename Signature>
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class channel_payload<Signature>
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{
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public:
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channel_payload(BOOST_ASIO_MOVE_ARG(channel_message<Signature>) m)
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: message_(BOOST_ASIO_MOVE_CAST(channel_message<Signature>)(m))
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{
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}
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template <typename Handler>
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void receive(Handler& handler)
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{
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message_.receive(handler);
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}
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private:
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channel_message<Signature> message_;
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};
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#if defined(BOOST_ASIO_HAS_STD_VARIANT)
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template <typename... Signatures>
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class channel_payload
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{
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public:
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template <typename Signature>
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channel_payload(BOOST_ASIO_MOVE_ARG(channel_message<Signature>) m)
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: message_(BOOST_ASIO_MOVE_CAST(channel_message<Signature>)(m))
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{
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}
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template <typename Handler>
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void receive(Handler& handler)
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{
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std::visit(
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[&](auto& message)
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{
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message.receive(handler);
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}, message_);
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}
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private:
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std::variant<channel_message<Signatures>...> message_;
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};
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#else // defined(BOOST_ASIO_HAS_STD_VARIANT)
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template <typename R1, typename R2>
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class channel_payload<R1(), R2(boost::system::error_code)>
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{
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public:
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typedef channel_message<R1()> void_message_type;
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typedef channel_message<R2(boost::system::error_code)> error_message_type;
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channel_payload(BOOST_ASIO_MOVE_ARG(void_message_type))
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: message_(0, boost::system::error_code()),
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empty_(true)
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{
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}
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channel_payload(BOOST_ASIO_MOVE_ARG(error_message_type) m)
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: message_(BOOST_ASIO_MOVE_CAST(error_message_type)(m)),
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empty_(false)
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{
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}
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template <typename Handler>
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void receive(Handler& handler)
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{
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if (empty_)
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channel_message<R1()>(0).receive(handler);
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else
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message_.receive(handler);
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}
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private:
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error_message_type message_;
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bool empty_;
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};
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#endif // defined(BOOST_ASIO_HAS_STD_VARIANT)
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} // namespace detail
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} // namespace experimental
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#endif // BOOST_ASIO_EXPERIMENTAL_DETAIL_CHANNEL_PAYLOAD_HPP
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