/* * Copyright (c) Facebook, Inc. and its affiliates. * * 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 #include #include #include namespace folly { namespace observer { template class SimpleObservable { public: template < typename U = T, typename = std::enable_if_t::value>> SimpleObservable(); explicit SimpleObservable(T value); explicit SimpleObservable(std::shared_ptr value); void setValue(T value); void setValue(std::shared_ptr value); auto getObserver() const; private: struct Context { folly::Synchronized> value_; folly::Synchronized> callback_; Context() = default; explicit Context(std::shared_ptr value); }; struct Wrapper; std::shared_ptr context_; mutable folly::DelayedInit< Observer::type>> observer_; }; } // namespace observer } // namespace folly #include