67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <folly/experimental/observer/Observer.h>
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#include <folly/synchronization/Baton.h>
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namespace folly {
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namespace observer {
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namespace detail {
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template <typename Observable, typename Traits>
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class ObserverCreatorContext;
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}
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template <typename Observable>
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struct ObservableTraits {
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using element_type =
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typename std::remove_reference<Observable>::type::element_type;
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static std::shared_ptr<const element_type> get(Observable& observable) {
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return observable.get();
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}
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template <typename F>
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static void subscribe(Observable& observable, F&& callback) {
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observable.subscribe(std::forward<F>(callback));
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}
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static void unsubscribe(Observable& observable) { observable.unsubscribe(); }
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};
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template <typename Observable, typename Traits = ObservableTraits<Observable>>
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class ObserverCreator {
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public:
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using T = typename Traits::element_type;
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template <typename... Args>
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explicit ObserverCreator(Args&&... args);
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Observer<T> getObserver() &&;
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private:
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using Context = detail::ObserverCreatorContext<Observable, Traits>;
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class ContextPrimaryPtr;
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std::shared_ptr<Context> context_;
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};
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} // namespace observer
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} // namespace folly
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#include <folly/experimental/observer/Observable-inl.h>
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