1/*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#ifndef OHOS_MEMORY_MEMMGR_COMMON_INCLUDE_SINGLE_INSTANCE_H
17#define OHOS_MEMORY_MEMMGR_COMMON_INCLUDE_SINGLE_INSTANCE_H
18
19namespace OHOS {
20namespace MemMgr {
21#define DECLARE_SINGLE_INSTANCE_BASE(className)       \
22public:                                               \
23    static className& GetInstance();                  \
24private:                                              \
25    className(const className&) = delete;             \
26    className& operator= (const className&) = delete; \
27    className(className&&) = delete;                  \
28    className& operator= (className&&) = delete;      \
29
30#define DECLARE_SINGLE_INSTANCE(className)  \
31    DECLARE_SINGLE_INSTANCE_BASE(className) \
32private:                                    \
33    className() = default;                  \
34    ~className() = default;                 \
35
36#define IMPLEMENT_SINGLE_INSTANCE(className) \
37className& className::GetInstance()          \
38{                                            \
39    static auto instance = new className();  \
40    return *instance;                        \
41}
42} // namespace MemMgr
43} // namespace OHOS
44#endif // OHOS_MEMORY_MEMMGR_COMMON_INCLUDE_SINGLE_INSTANCE_H
45