|  | /* | 
|  | * Copyright 2022 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. | 
|  | */ | 
|  |  | 
|  | #pragma once | 
|  |  | 
|  | namespace android::ftl::details { | 
|  |  | 
|  | template <typename Self, template <typename> class> | 
|  | class Mixin { | 
|  | protected: | 
|  | constexpr Self& self() { return *static_cast<Self*>(this); } | 
|  | constexpr const Self& self() const { return *static_cast<const Self*>(this); } | 
|  |  | 
|  | constexpr auto& mut() { return self().value_; } | 
|  | }; | 
|  |  | 
|  | }  // namespace android::ftl::details |