mirror of
https://github.com/openharmony/window_window_manager.git
synced 2026-08-25 13:10:03 -04:00
zhangweihua
72 lines
3.4 KiB
C++
72 lines
3.4 KiB
C++
/*
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* Copyright (c) 2021-2022 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 OHOS_WM_SINGLE_INSTANCE_H
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#define OHOS_WM_SINGLE_INSTANCE_H
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#include <mutex>
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namespace OHOS {
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namespace Rosen {
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#define WM_DECLARE_SINGLE_INSTANCE_BASE(className) \
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public: \
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static className& GetInstance(); \
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static bool SetInstance(className* newInstance); \
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static void DestroyInstance(); \
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className(const className&) = delete; \
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className& operator=(const className&) = delete; \
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className(className&&) = delete; \
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className& operator=(className&&) = delete; \
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static className* singleton_; \
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static std::mutex singletonMutex_; \
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#define WM_DECLARE_SINGLE_INSTANCE(className) \
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WM_DECLARE_SINGLE_INSTANCE_BASE(className) \
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protected: \
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className() = default; \
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virtual ~className() = default; \
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#define WM_IMPLEMENT_SINGLE_INSTANCE(className) \
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className* className::singleton_ = nullptr; \
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std::mutex className::singletonMutex_; \
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className& className::GetInstance() \
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{ \
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if (!singleton_) { \
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std::lock_guard<std::mutex> lock(singletonMutex_); \
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if (!singleton_) { \
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singleton_ = new className(); \
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} \
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} \
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return *singleton_; \
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} \
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bool className::SetInstance(className* newInstance) \
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{ \
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if (singleton_) { \
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return false; \
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} \
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singleton_ = newInstance; \
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return true; \
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} \
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void className::DestroyInstance() \
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{ \
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std::lock_guard<std::mutex> lock(singletonMutex_); \
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if (!singleton_) { \
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delete singleton_; \
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singleton_ = nullptr; \
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} \
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}
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} // namespace Rosen
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} // namespace OHOS
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#endif // OHOS_SINGLE_INSTANCE_H
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