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diff --git a/3rdparty/asio/include/asio/experimental/impl/as_single.hpp b/3rdparty/asio/include/asio/experimental/impl/as_single.hpp
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+//
+// experimental/impl/as_single.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_IMPL_EXPERIMENTAL_AS_SINGLE_HPP
+#define ASIO_IMPL_EXPERIMENTAL_AS_SINGLE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include <tuple>
+
+#include "asio/associator.hpp"
+#include "asio/async_result.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_cont_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/type_traits.hpp"
+#include "asio/detail/variadic_templates.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace experimental {
+namespace detail {
+
+// Class to adapt a as_single_t as a completion handler.
+template <typename Handler>
+class as_single_handler
+{
+public:
+ typedef void result_type;
+
+ template <typename CompletionToken>
+ as_single_handler(as_single_t<CompletionToken> e)
+ : handler_(ASIO_MOVE_CAST(CompletionToken)(e.token_))
+ {
+ }
+
+ template <typename RedirectedHandler>
+ as_single_handler(ASIO_MOVE_ARG(RedirectedHandler) h)
+ : handler_(ASIO_MOVE_CAST(RedirectedHandler)(h))
+ {
+ }
+
+ void operator()()
+ {
+ ASIO_MOVE_OR_LVALUE(Handler)(handler_)();
+ }
+
+ template <typename Arg>
+ void operator()(ASIO_MOVE_ARG(Arg) arg)
+ {
+ ASIO_MOVE_OR_LVALUE(Handler)(handler_)(
+ ASIO_MOVE_CAST(Arg)(arg));
+ }
+
+ template <typename... Args>
+ void operator()(ASIO_MOVE_ARG(Args)... args)
+ {
+ ASIO_MOVE_OR_LVALUE(Handler)(handler_)(
+ std::make_tuple(ASIO_MOVE_CAST(Args)(args)...));
+ }
+
+//private:
+ Handler handler_;
+};
+
+template <typename Handler>
+inline asio_handler_allocate_is_deprecated
+asio_handler_allocate(std::size_t size,
+ as_single_handler<Handler>* this_handler)
+{
+#if defined(ASIO_NO_DEPRECATED)
+ asio_handler_alloc_helpers::allocate(size, this_handler->handler_);
+ return asio_handler_allocate_is_no_longer_used();
+#else // defined(ASIO_NO_DEPRECATED)
+ return asio_handler_alloc_helpers::allocate(
+ size, this_handler->handler_);
+#endif // defined(ASIO_NO_DEPRECATED)
+}
+
+template <typename Handler>
+inline asio_handler_deallocate_is_deprecated
+asio_handler_deallocate(void* pointer, std::size_t size,
+ as_single_handler<Handler>* this_handler)
+{
+ asio_handler_alloc_helpers::deallocate(
+ pointer, size, this_handler->handler_);
+#if defined(ASIO_NO_DEPRECATED)
+ return asio_handler_deallocate_is_no_longer_used();
+#endif // defined(ASIO_NO_DEPRECATED)
+}
+
+template <typename Handler>
+inline bool asio_handler_is_continuation(
+ as_single_handler<Handler>* this_handler)
+{
+ return asio_handler_cont_helpers::is_continuation(
+ this_handler->handler_);
+}
+
+template <typename Function, typename Handler>
+inline asio_handler_invoke_is_deprecated
+asio_handler_invoke(Function& function,
+ as_single_handler<Handler>* this_handler)
+{
+ asio_handler_invoke_helpers::invoke(
+ function, this_handler->handler_);
+#if defined(ASIO_NO_DEPRECATED)
+ return asio_handler_invoke_is_no_longer_used();
+#endif // defined(ASIO_NO_DEPRECATED)
+}
+
+template <typename Function, typename Handler>
+inline asio_handler_invoke_is_deprecated
+asio_handler_invoke(const Function& function,
+ as_single_handler<Handler>* this_handler)
+{
+ asio_handler_invoke_helpers::invoke(
+ function, this_handler->handler_);
+#if defined(ASIO_NO_DEPRECATED)
+ return asio_handler_invoke_is_no_longer_used();
+#endif // defined(ASIO_NO_DEPRECATED)
+}
+
+template <typename Signature>
+struct as_single_signature
+{
+ typedef Signature type;
+};
+
+template <typename R>
+struct as_single_signature<R()>
+{
+ typedef R type();
+};
+
+template <typename R, typename Arg>
+struct as_single_signature<R(Arg)>
+{
+ typedef R type(Arg);
+};
+
+template <typename R, typename... Args>
+struct as_single_signature<R(Args...)>
+{
+ typedef R type(std::tuple<typename decay<Args>::type...>);
+};
+
+} // namespace detail
+} // namespace experimental
+
+#if !defined(GENERATING_DOCUMENTATION)
+
+template <typename CompletionToken, typename Signature>
+struct async_result<experimental::as_single_t<CompletionToken>, Signature>
+{
+ typedef typename async_result<CompletionToken,
+ typename experimental::detail::as_single_signature<Signature>::type>
+ ::return_type return_type;
+
+ template <typename Initiation>
+ struct init_wrapper
+ {
+ init_wrapper(Initiation init)
+ : initiation_(ASIO_MOVE_CAST(Initiation)(init))
+ {
+ }
+
+ template <typename Handler, typename... Args>
+ void operator()(
+ ASIO_MOVE_ARG(Handler) handler,
+ ASIO_MOVE_ARG(Args)... args)
+ {
+ ASIO_MOVE_CAST(Initiation)(initiation_)(
+ experimental::detail::as_single_handler<
+ typename decay<Handler>::type>(
+ ASIO_MOVE_CAST(Handler)(handler)),
+ ASIO_MOVE_CAST(Args)(args)...);
+ }
+
+ Initiation initiation_;
+ };
+
+ template <typename Initiation, typename RawCompletionToken, typename... Args>
+ static return_type initiate(
+ ASIO_MOVE_ARG(Initiation) initiation,
+ ASIO_MOVE_ARG(RawCompletionToken) token,
+ ASIO_MOVE_ARG(Args)... args)
+ {
+ return async_initiate<CompletionToken,
+ typename experimental::detail::as_single_signature<Signature>::type>(
+ init_wrapper<typename decay<Initiation>::type>(
+ ASIO_MOVE_CAST(Initiation)(initiation)),
+ token.token_, ASIO_MOVE_CAST(Args)(args)...);
+ }
+};
+
+template <template <typename, typename> class Associator,
+ typename Handler, typename DefaultCandidate>
+struct associator<Associator,
+ experimental::detail::as_single_handler<Handler>, DefaultCandidate>
+ : Associator<Handler, DefaultCandidate>
+{
+ static typename Associator<Handler, DefaultCandidate>::type get(
+ const experimental::detail::as_single_handler<Handler>& h,
+ const DefaultCandidate& c = DefaultCandidate()) ASIO_NOEXCEPT
+ {
+ return Associator<Handler, DefaultCandidate>::get(h.handler_, c);
+ }
+};
+
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IMPL_EXPERIMENTAL_AS_SINGLE_HPP