MoveHandler.h

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// Copyright (c) 2019 Computer Vision Center (CVC) at the Universitat Autonoma
// de Barcelona (UAB).
//
// This work is licensed under the terms of the MIT license.
// For a copy, see <https://opensource.org/licenses/MIT>.

#pragma once

#include <type_traits>
#include <utility>

namespace carla {
namespace detail {

  template <typename FunctorT>
  struct MoveWrapper : FunctorT {
    MoveWrapper(FunctorT &&f) : FunctorT(std::move(f)) {}

    MoveWrapper(MoveWrapper &&) = default;
    MoveWrapper& operator=(MoveWrapper &&) = default;

    MoveWrapper(const MoveWrapper &);
    MoveWrapper& operator=(const MoveWrapper &);
  };

} // namespace detail

  /// Hack to trick asio into accepting move-only handlers, if the handler were
  /// actually copied it would result in a link error.
  ///
  /// @see https://stackoverflow.com/a/22891509.
  template <typename FunctorT>
  auto MoveHandler(FunctorT &&func) {
    using F = typename std::decay<FunctorT>::type;
    return detail::MoveWrapper<F>{std::move(func)};
  }

} // namespace carla