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+//
+// use_future.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 ASIO_USE_FUTURE_HPP
+#define ASIO_USE_FUTURE_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/future.hpp"
+
+#if defined(ASIO_HAS_STD_FUTURE_CLASS) \
+ || defined(GENERATING_DOCUMENTATION)
+
+#include <memory>
+#include "asio/detail/type_traits.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Function, typename Allocator>
+class packaged_token;
+
+template <typename Function, typename Allocator, typename Result>
+class packaged_handler;
+
+} // namespace detail
+
+/// Class used to specify that an asynchronous operation should return a future.
+/**
+ * The use_future_t class is used to indicate that an asynchronous operation
+ * should return a std::future object. A use_future_t object may be passed as a
+ * handler to an asynchronous operation, typically using the special value @c
+ * asio::use_future. For example:
+ *
+ * @code std::future<std::size_t> my_future
+ * = my_socket.async_read_some(my_buffer, asio::use_future); @endcode
+ *
+ * The initiating function (async_read_some in the above example) returns a
+ * future that will receive the result of the operation. If the operation
+ * completes with an error_code indicating failure, it is converted into a
+ * system_error and passed back to the caller via the future.
+ */
+template <typename Allocator = std::allocator<void> >
+class use_future_t
+{
+public:
+ /// The allocator type. The allocator is used when constructing the
+ /// @c std::promise object for a given asynchronous operation.
+ typedef Allocator allocator_type;
+
+ /// Construct using default-constructed allocator.
+ ASIO_CONSTEXPR use_future_t()
+ {
+ }
+
+ /// Construct using specified allocator.
+ explicit use_future_t(const Allocator& allocator)
+ : allocator_(allocator)
+ {
+ }
+
+#if !defined(ASIO_NO_DEPRECATED)
+ /// (Deprecated: Use rebind().) Specify an alternate allocator.
+ template <typename OtherAllocator>
+ use_future_t<OtherAllocator> operator[](const OtherAllocator& allocator) const
+ {
+ return use_future_t<OtherAllocator>(allocator);
+ }
+#endif // !defined(ASIO_NO_DEPRECATED)
+
+ /// Specify an alternate allocator.
+ template <typename OtherAllocator>
+ use_future_t<OtherAllocator> rebind(const OtherAllocator& allocator) const
+ {
+ return use_future_t<OtherAllocator>(allocator);
+ }
+
+ /// Obtain allocator.
+ allocator_type get_allocator() const
+ {
+ return allocator_;
+ }
+
+ /// Wrap a function object in a packaged task.
+ /**
+ * The @c package function is used to adapt a function object as a packaged
+ * task. When this adapter is passed as a completion token to an asynchronous
+ * operation, the result of the function object is retuned via a std::future.
+ *
+ * @par Example
+ *
+ * @code std::future<std::size_t> fut =
+ * my_socket.async_read_some(buffer,
+ * use_future([](asio::error_code ec, std::size_t n)
+ * {
+ * return ec ? 0 : n;
+ * }));
+ * ...
+ * std::size_t n = fut.get(); @endcode
+ */
+ template <typename Function>
+#if defined(GENERATING_DOCUMENTATION)
+ unspecified
+#else // defined(GENERATING_DOCUMENTATION)
+ detail::packaged_token<typename decay<Function>::type, Allocator>
+#endif // defined(GENERATING_DOCUMENTATION)
+ operator()(ASIO_MOVE_ARG(Function) f) const;
+
+private:
+ // Helper type to ensure that use_future can be constexpr default-constructed
+ // even when std::allocator<void> can't be.
+ struct std_allocator_void
+ {
+ ASIO_CONSTEXPR std_allocator_void()
+ {
+ }
+
+ operator std::allocator<void>() const
+ {
+ return std::allocator<void>();
+ }
+ };
+
+ typename conditional<
+ is_same<std::allocator<void>, Allocator>::value,
+ std_allocator_void, Allocator>::type allocator_;
+};
+
+/// A special value, similar to std::nothrow.
+/**
+ * See the documentation for asio::use_future_t for a usage example.
+ */
+#if defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
+constexpr use_future_t<> use_future;
+#elif defined(ASIO_MSVC)
+__declspec(selectany) use_future_t<> use_future;
+#endif
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/impl/use_future.hpp"
+
+#endif // defined(ASIO_HAS_STD_FUTURE_CLASS)
+ // || defined(GENERATING_DOCUMENTATION)
+
+#endif // ASIO_USE_FUTURE_HPP