2 * Copyright 2017 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/experimental/observer/Observer.h>
23 template <typename Observable>
24 struct ObservableTraits {
26 typename std::remove_reference<Observable>::type::element_type;
28 static std::shared_ptr<const element_type> get(Observable& observable) {
29 return observable.get();
33 static void subscribe(Observable& observable, F&& callback) {
34 observable.subscribe(std::forward<F>(callback));
37 static void unsubscribe(Observable& observable) {
38 observable.unsubscribe();
42 template <typename Observable, typename Traits = ObservableTraits<Observable>>
43 class ObserverCreator {
45 using T = typename Traits::element_type;
47 template <typename... Args>
48 explicit ObserverCreator(Args&&... args);
50 Observer<T> getObserver() &&;
55 std::shared_ptr<Context> context_;
60 #include <folly/experimental/observer/Observable-inl.h>