/*
 * Copyright (c) 2022 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 OHOS_MEMORY_MEMMGR_COMMON_INCLUDE_SINGLE_INSTANCE_H
#define OHOS_MEMORY_MEMMGR_COMMON_INCLUDE_SINGLE_INSTANCE_H

namespace OHOS {
namespace MemMgr {
#define DECLARE_SINGLE_INSTANCE_BASE(className)       \
public:                                               \
    static className& GetInstance();                  \
private:                                              \
    className(const className&) = delete;             \
    className& operator= (const className&) = delete; \
    className(className&&) = delete;                  \
    className& operator= (className&&) = delete;      \

#define DECLARE_SINGLE_INSTANCE(className)  \
    DECLARE_SINGLE_INSTANCE_BASE(className) \
private:                                    \
    className() = default;                  \
    ~className() = default;                 \

#define IMPLEMENT_SINGLE_INSTANCE(className) \
className& className::GetInstance()          \
{                                            \
    static auto instance = new className();  \
    return *instance;                        \
}
} // namespace MemMgr
} // namespace OHOS
#endif // OHOS_MEMORY_MEMMGR_COMMON_INCLUDE_SINGLE_INSTANCE_H