text: /******************************************************************************
   *                       ____    _    _____                                   *
   *                      / ___|  / \  |  ___|    C++                           *
   *                     | |     / _ \ | |_       Actor                         *
   *                     | |___ / ___ \|  _|      Framework                     *
   *                      \____/_/   \_|_|                                      *
   *                                                                            *
   * Copyright 2011-2018 Dominik Charousset                                     *
   *                                                                            *
   * Distributed under the terms and conditions of the BSD 3-Clause License or  *
   * (at your option) under the terms and conditions of the Boost Software      *
   * License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE.       *
   *                                                                            *
   * If you did not receive a copy of the license files, see                    *
   * http://opensource.org/licenses/BSD-3-Clause and                            *
   * http://www.boost.org/LICENSE_1_0.txt.                                      *
   ******************************************************************************/
  
  #pragma once
  
  #include <functional>
  #include <type_traits>
  
  #include "caf/actor.hpp"
  
  namespace caf {
  namespace detail {
  
  /// Converts `scoped_actor` and pointers to actors to handles of type `actor`
  /// but simply forwards any other argument in the same way `std::forward` does.
  template <class T>
  typename std::conditional<
    is_convertible_to_actor<typename std::decay<T>::type>::value,
    actor,
    T&&
  >::type
  spawn_fwd(typename std::remove_reference<T>::type& arg) noexcept {
    return static_cast<T&&>(arg);
  }
  
  /// Converts `scoped_actor` and pointers to actors to handles of type `actor`
  /// but simply forwards any other argument in the same way `std::forward` does.
  template <class T>
  typename std::conditional<
    is_convertible_to_actor<typename std::decay<T>::type>::value,
    actor,
    T&&
  >::type
  spawn_fwd(typename std::remove_reference<T>::type&& arg) noexcept {
    static_assert(!std::is_lvalue_reference<T>::value,
                  "silently converting an lvalue to an rvalue");
    return static_cast<T&&>(arg);
  }
  
  } // namespace detail
  } // namespace caf
  
  