Initial Commit

include/asio/detail/completion_payload_handler.hpp

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+//
+// detail/completion_payload_handler.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2025 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_COMPLETION_PAYLOAD_HANDLER_HPP
+#define ASIO_DETAIL_COMPLETION_PAYLOAD_HANDLER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/associator.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Payload, typename Handler>
+class completion_payload_handler
+{
+public:
+  completion_payload_handler(Payload&& p, Handler& h)
+    : payload_(static_cast<Payload&&>(p)),
+      handler_(static_cast<Handler&&>(h))
+  {
+  }
+
+  void operator()()
+  {
+    payload_.receive(handler_);
+  }
+
+  Handler& handler()
+  {
+    return handler_;
+  }
+
+//private:
+  Payload payload_;
+  Handler handler_;
+};
+
+} // namespace detail
+
+template <template <typename, typename> class Associator,
+    typename Payload, typename Handler, typename DefaultCandidate>
+struct associator<Associator,
+    detail::completion_payload_handler<Payload, Handler>,
+    DefaultCandidate>
+  : Associator<Handler, DefaultCandidate>
+{
+  static typename Associator<Handler, DefaultCandidate>::type get(
+      const detail::completion_payload_handler<Payload, Handler>& h) noexcept
+  {
+    return Associator<Handler, DefaultCandidate>::get(h.handler_);
+  }
+
+  static auto get(
+      const detail::completion_payload_handler<Payload, Handler>& h,
+      const DefaultCandidate& c) noexcept
+    -> decltype(Associator<Handler, DefaultCandidate>::get(h.handler_, c))
+  {
+    return Associator<Handler, DefaultCandidate>::get(h.handler_, c);
+  }
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_COMPLETION_PAYLOAD_HANDLER_HPP