mirror of
https://github.com/openharmony/ace_ace_engine.git
synced 2026-07-21 01:45:30 -04:00
mamingshuai
83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
/*
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* Copyright (c) 2021 Huawei Device Co., Ltd.
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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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#ifndef FOUNDATION_ACE_FRAMEWORKS_BASE_UTILS_EVENT_CALLBACK_H
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#define FOUNDATION_ACE_FRAMEWORKS_BASE_UTILS_EVENT_CALLBACK_H
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#include <functional>
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#include "base/utils/base_id.h"
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#include "base/utils/macros.h"
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namespace OHOS::Ace {
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template<class>
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class EventCallback;
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template<class R, class... Args>
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class EventCallback<R(Args...)> : public BaseId {
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public:
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using FunctionType = std::function<R(Args...)>;
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EventCallback() : callback_(nullptr) {}
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explicit EventCallback(FunctionType&& callback) : callback_(std::move(callback)) {}
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explicit EventCallback(const FunctionType& callback) : callback_(callback) {}
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~EventCallback() override = default;
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// Notice: uses operator bool to judge its legitimacy.
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R operator()(Args&&... args) const
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{
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return callback_(std::forward<Args>(args)...);
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}
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explicit operator bool() const
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{
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return callback_ != nullptr;
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}
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bool operator==(std::nullptr_t) const
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{
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return callback_ == nullptr;
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}
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bool operator!=(std::nullptr_t) const
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{
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return callback_ != nullptr;
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}
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bool operator==(const EventCallback& callback) const
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{
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return GetId() == callback.GetId();
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}
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bool operator<(const EventCallback& callback) const
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{
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return GetId() < callback.GetId();
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}
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const FunctionType& GetCallback() const
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{
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return callback_;
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}
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private:
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FunctionType callback_;
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};
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} // namespace OHOS::Ace
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#endif // FOUNDATION_ACE_FRAMEWORKS_BASE_UTILS_EVENT_CALLBACK_H
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