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+//
+// execution/invocable_archetype.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_EXECUTION_INVOCABLE_ARCHETYPE_HPP
+#define ASIO_EXECUTION_INVOCABLE_ARCHETYPE_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/type_traits.hpp"
+#include "asio/detail/variadic_templates.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace execution {
+
+/// An archetypal function object used for determining adherence to the
+/// execution::executor concept.
+struct invocable_archetype
+{
+#if !defined(GENERATING_DOCUMENTATION)
+ // Necessary for compatibility with a C++03 implementation of result_of.
+ typedef void result_type;
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+#if defined(ASIO_HAS_VARIADIC_TEMPLATES) \
+ || defined(GENERATING_DOCUMENTATION)
+
+ /// Function call operator.
+ template <typename... Args>
+ void operator()(ASIO_MOVE_ARG(Args)...)
+ {
+ }
+
+#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
+ // || defined(GENERATING_DOCUMENTATION)
+
+ void operator()()
+ {
+ }
+
+#define ASIO_PRIVATE_INVOCABLE_ARCHETYPE_CALL_DEF(n) \
+ template <ASIO_VARIADIC_TPARAMS(n)> \
+ void operator()(ASIO_VARIADIC_UNNAMED_MOVE_PARAMS(n)) \
+ { \
+ } \
+ /**/
+ ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_INVOCABLE_ARCHETYPE_CALL_DEF)
+#undef ASIO_PRIVATE_INVOCABLE_ARCHETYPE_CALL_DEF
+
+#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
+ // || defined(GENERATING_DOCUMENTATION)
+};
+
+} // namespace execution
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_EXECUTION_INVOCABLE_ARCHETYPE_HPP
+