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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/experimental/observer/Observer.h>
- namespace folly {
- namespace observer {
- namespace detail {
- template <typename Observable, typename Traits>
- class ObserverCreatorContext;
- }
- template <typename Observable>
- struct ObservableTraits {
- using element_type =
- typename std::remove_reference<Observable>::type::element_type;
- static std::shared_ptr<const element_type> get(Observable& observable) {
- return observable.get();
- }
- template <typename F>
- static void subscribe(Observable& observable, F&& callback) {
- observable.subscribe(std::forward<F>(callback));
- }
- static void unsubscribe(Observable& observable) {
- observable.unsubscribe();
- }
- };
- template <typename Observable, typename Traits = ObservableTraits<Observable>>
- class ObserverCreator {
- public:
- using T = typename Traits::element_type;
- template <typename... Args>
- explicit ObserverCreator(Args&&... args);
- Observer<T> getObserver() &&;
- private:
- using Context = detail::ObserverCreatorContext<Observable, Traits>;
- std::shared_ptr<Context> context_;
- };
- } // namespace observer
- } // namespace folly
- #include <folly/experimental/observer/Observable-inl.h>
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