Initial Commit

include/asio/experimental/impl/use_promise.hpp

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+//
+// experimental/impl/use_promise.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2021-2023 Klemens D. Morgenstern
+//                         (klemens dot morgenstern at gmx dot net)
+//
+// 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_EXPERIMENTAL_IMPL_USE_PROMISE_HPP
+#define ASIO_EXPERIMENTAL_IMPL_USE_PROMISE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include <memory>
+#include "asio/async_result.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace experimental {
+
+template <typename Allocator>
+struct use_promise_t;
+
+namespace detail {
+
+template<typename Signature, typename Executor, typename Allocator>
+struct promise_handler;
+
+} // namespace detail
+} // namespace experimental
+
+#if !defined(GENERATING_DOCUMENTATION)
+
+template <typename Allocator, typename R, typename... Args>
+struct async_result<experimental::use_promise_t<Allocator>, R(Args...)>
+{
+  template <typename Initiation, typename... InitArgs>
+  static auto initiate(Initiation initiation,
+      experimental::use_promise_t<Allocator> up, InitArgs... args)
+    -> experimental::promise<void(decay_t<Args>...),
+      asio::associated_executor_t<Initiation>, Allocator>
+  {
+    using handler_type = experimental::detail::promise_handler<
+      void(decay_t<Args>...),
+      asio::associated_executor_t<Initiation>, Allocator>;
+
+    handler_type ht{up.get_allocator(), get_associated_executor(initiation)};
+    std::move(initiation)(ht, std::move(args)...);
+    return ht.make_promise();
+  }
+};
+
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_EXPERIMENTAL_IMPL_USE_PROMISE_HPP