| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #ifndef UTIL_CHRE_OPTIONAL_IMPL_H_ |
| #define UTIL_CHRE_OPTIONAL_IMPL_H_ |
| |
| #include <new> |
| #include <utility> |
| |
| #include "chre/util/optional.h" |
| |
| namespace chre { |
| |
| template <typename ObjectType> |
| Optional<ObjectType>::Optional(const ObjectType &object) { |
| new (objectAddr()) ObjectType(object); |
| mHasValue = true; |
| } |
| |
| template <typename ObjectType> |
| Optional<ObjectType>::Optional(ObjectType &&object) { |
| new (objectAddr()) ObjectType(std::move(object)); |
| mHasValue = true; |
| } |
| |
| template <typename ObjectType> |
| Optional<ObjectType>::~Optional() { |
| reset(); |
| } |
| |
| template <typename ObjectType> |
| bool Optional<ObjectType>::has_value() const { |
| return mHasValue; |
| } |
| |
| template <typename ObjectType> |
| void Optional<ObjectType>::reset() { |
| if (mHasValue) { |
| object().~ObjectType(); |
| mHasValue = false; |
| } |
| } |
| |
| template <typename ObjectType> |
| ObjectType &Optional<ObjectType>::value() { |
| return object(); |
| } |
| |
| template <typename ObjectType> |
| const ObjectType &Optional<ObjectType>::value() const { |
| return object(); |
| } |
| |
| template <typename ObjectType> |
| Optional<ObjectType> &Optional<ObjectType>::operator=(ObjectType &&other) { |
| if (mHasValue) { |
| object() = std::move(other); |
| } else { |
| new (objectAddr()) ObjectType(std::move(other)); |
| } |
| |
| mHasValue = true; |
| return *this; |
| } |
| |
| template <typename ObjectType> |
| Optional<ObjectType> &Optional<ObjectType>::operator=( |
| Optional<ObjectType> &&other) { |
| if (mHasValue) { |
| if (other.mHasValue) { |
| object() = std::move(other.object()); |
| } else { |
| reset(); |
| } |
| } else if (other.mHasValue) { |
| new (objectAddr()) ObjectType(std::move(other.object())); |
| } |
| |
| mHasValue = other.mHasValue; |
| return *this; |
| } |
| |
| template <typename ObjectType> |
| Optional<ObjectType> &Optional<ObjectType>::operator=(const ObjectType &other) { |
| if (mHasValue) { |
| object() = std::move(other); |
| } else { |
| new (objectAddr()) ObjectType(other); |
| } |
| |
| mHasValue = true; |
| return *this; |
| } |
| |
| template <typename ObjectType> |
| Optional<ObjectType> &Optional<ObjectType>::operator=( |
| const Optional<ObjectType> &other) { |
| if (mHasValue) { |
| if (other.mHasValue) { |
| object() = other.object(); |
| } else { |
| reset(); |
| } |
| } else if (other.mHasValue) { |
| new (objectAddr()) ObjectType(other.object()); |
| } |
| |
| mHasValue = other.mHasValue; |
| return *this; |
| } |
| |
| template <typename ObjectType> |
| ObjectType &Optional<ObjectType>::operator*() { |
| return object(); |
| } |
| |
| template <typename ObjectType> |
| const ObjectType &Optional<ObjectType>::operator*() const { |
| return object(); |
| } |
| |
| template <typename ObjectType> |
| ObjectType *Optional<ObjectType>::operator->() { |
| return objectAddr(); |
| } |
| |
| template <typename ObjectType> |
| const ObjectType *Optional<ObjectType>::operator->() const { |
| return objectAddr(); |
| } |
| |
| template <typename ObjectType> |
| ObjectType &Optional<ObjectType>::object() { |
| return *objectAddr(); |
| } |
| |
| template <typename ObjectType> |
| const ObjectType &Optional<ObjectType>::object() const { |
| return *objectAddr(); |
| } |
| |
| template <typename ObjectType> |
| ObjectType *Optional<ObjectType>::objectAddr() { |
| return std::launder(reinterpret_cast<ObjectType *>(&mObject)); |
| } |
| |
| template <typename ObjectType> |
| const ObjectType *Optional<ObjectType>::objectAddr() const { |
| return std::launder(reinterpret_cast<const ObjectType *>(&mObject)); |
| } |
| |
| } // namespace chre |
| |
| #endif // UTIL_CHRE_OPTIONAL_IMPL_H_ |