MoveWrapper.h

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/*
 * Copyright 2013-present Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <memory>

namespace folly {

template <class T>
class MoveWrapper {
 public:
  MoveWrapper() = default;

  explicit MoveWrapper(T&& t) : value(std::move(t)) {}

  MoveWrapper(const MoveWrapper& other) : value(std::move(other.value)) {}

  MoveWrapper(MoveWrapper&& other) : value(std::move(other.value)) {}

  const T& operator*() const {
    return value;
  }
  T& operator*() {
    return value;
  }

  const T* operator->() const {
    return &value;
  }
  T* operator->() {
    return &value;
  }

  T&& move() {
    return std::move(value);
  }

  // If you want these you're probably doing it wrong, though they'd be
  // easy enough to implement
  MoveWrapper& operator=(MoveWrapper const&) = delete;
  MoveWrapper& operator=(MoveWrapper&&) = delete;

 private:
  mutable T value;
};

template <class T, class T0 = typename std::remove_reference<T>::type>
MoveWrapper<T0> makeMoveWrapper(T&& t) {
  return MoveWrapper<T0>(std::forward<T0>(t));
}

} // namespace folly