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- /*
- * Copyright 2016-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 <folly/Function.h>
- #include <folly/Synchronized.h>
- #include <folly/experimental/observer/Observer.h>
- namespace folly {
- namespace observer {
- template <typename T>
- class SimpleObservable {
- public:
- explicit SimpleObservable(T value);
- explicit SimpleObservable(std::shared_ptr<const T> value);
- void setValue(T value);
- void setValue(std::shared_ptr<const T> value);
- Observer<T> getObserver();
- private:
- struct Context {
- folly::Synchronized<std::shared_ptr<const T>> value_;
- folly::Synchronized<folly::Function<void()>> callback_;
- };
- struct Wrapper;
- std::shared_ptr<Context> context_;
- std::once_flag observerInit_;
- folly::Optional<Observer<T>> observer_;
- };
- } // namespace observer
- } // namespace folly
- #include <folly/experimental/observer/SimpleObservable-inl.h>
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