2 * Copyright 2016 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 #include <folly/Function.h>
19 #include <folly/Synchronized.h>
20 #include <folly/experimental/observer/Observer.h>
26 class SimpleObservable {
28 explicit SimpleObservable(T value);
29 explicit SimpleObservable(std::shared_ptr<const T> value);
31 void setValue(T value);
32 void setValue(std::shared_ptr<const T> value);
34 Observer<T> getObserver();
38 folly::Synchronized<std::shared_ptr<const T>> value_;
39 folly::Synchronized<folly::Function<void()>> callback_;
42 std::shared_ptr<Context> context_;
44 std::once_flag observerInit_;
45 folly::Optional<Observer<T>> observer_;
50 #include <folly/experimental/observer/SimpleObservable-inl.h>