xref: /foundation/arkui/ace_engine/frameworks/base/utils/singleton.h

/*
 * Copyright (c) 2021 Huawei Device Co., Ltd.
 * 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.
 */

#ifndef FOUNDATION_ACE_FRAMEWORKS_BASE_UTILS_SINGLETON_H
#define FOUNDATION_ACE_FRAMEWORKS_BASE_UTILS_SINGLETON_H

#include "base/utils/noncopyable.h"

namespace OHOS::Ace {

#define DECLARE_SINGLETON(MyClass)               \
private:                                         \
    friend Singleton<MyClass>;                   \
    MyClass& operator=(const MyClass&) = delete; \
    MyClass(const MyClass&) = delete;            \
    MyClass();                                   \
    ~MyClass();

template<typename T>
class Singleton : public NonCopyable {
public:
    static T& GetInstance()
    {
        return instance_;
    }

private:
    static T instance_;
};

template<typename T>
T Singleton<T>::instance_;

} // namespace OHOS::Ace

#endif // FOUNDATION_ACE_FRAMEWORKS_BASE_UTILS_SINGLETON_H