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//
// execution/invocable_archetype.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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 BOOST_ASIO_EXECUTION_INVOCABLE_ARCHETYPE_HPP
#define BOOST_ASIO_EXECUTION_INVOCABLE_ARCHETYPE_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include <boost/asio/detail/config.hpp>
#include <boost/asio/detail/type_traits.hpp>
#include <boost/asio/detail/variadic_templates.hpp>

#include <boost/asio/detail/push_options.hpp>

namespace boost {
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(BOOST_ASIO_HAS_VARIADIC_TEMPLATES) \
  || defined(GENERATING_DOCUMENTATION)

  /// Function call operator.
  template <typename... Args>
  void operator()(BOOST_ASIO_MOVE_ARG(Args)...)
  {
  }

#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
      //   || defined(GENERATING_DOCUMENTATION)

  void operator()()
  {
  }

#define BOOST_ASIO_PRIVATE_INVOCABLE_ARCHETYPE_CALL_DEF(n) \
  template <BOOST_ASIO_VARIADIC_TPARAMS(n)> \
  void operator()(BOOST_ASIO_VARIADIC_UNNAMED_MOVE_PARAMS(n)) \
  { \
  } \
  /**/
  BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_INVOCABLE_ARCHETYPE_CALL_DEF)
#undef BOOST_ASIO_PRIVATE_INVOCABLE_ARCHETYPE_CALL_DEF

#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
       //   || defined(GENERATING_DOCUMENTATION)
};

} // namespace execution
} // namespace asio
} // namespace boost

#include <boost/asio/detail/pop_options.hpp>

#endif // BOOST_ASIO_EXECUTION_INVOCABLE_ARCHETYPE_HPP