62 lines
1.7 KiB
C++
62 lines
1.7 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/Function.h>
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#include <folly/Synchronized.h>
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#include <folly/experimental/observer/Observer.h>
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#include <folly/synchronization/DelayedInit.h>
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namespace folly {
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namespace observer {
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template <typename T>
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class SimpleObservable {
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public:
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template <
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typename U = T,
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typename = std::enable_if_t<std::is_default_constructible<U>::value>>
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SimpleObservable();
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explicit SimpleObservable(T value);
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explicit SimpleObservable(std::shared_ptr<const T> value);
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void setValue(T value);
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void setValue(std::shared_ptr<const T> value);
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auto getObserver() const;
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private:
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struct Context {
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folly::Synchronized<std::shared_ptr<const T>> value_;
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folly::Synchronized<folly::Function<void()>> callback_;
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Context() = default;
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explicit Context(std::shared_ptr<const T> value);
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};
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struct Wrapper;
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std::shared_ptr<Context> context_;
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mutable folly::DelayedInit<
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Observer<typename observer_detail::Unwrap<T>::type>>
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observer_;
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};
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} // namespace observer
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} // namespace folly
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#include <folly/experimental/observer/SimpleObservable-inl.h>
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