1 /*
2  * Copyright (c) 2021 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 FOUNDATION_DISTRIBUTEDSCHEDULE_UTILS_NATIVE_INCLUDE_SINGLE_INSTANCE_H
17 #define FOUNDATION_DISTRIBUTEDSCHEDULE_UTILS_NATIVE_INCLUDE_SINGLE_INSTANCE_H
18 
19 namespace OHOS {
20 namespace DistributedSchedule {
21 #define DECLARE_SINGLE_INSTANCE_BASE(className)       \
22 public:                                               \
23     static className& GetInstance();                  \
24 private:                                              \
25     className(const className&) = delete;             \
26     className& operator= (const className&) = delete; \
27     className(className&&) = delete;                  \
28     className& operator= (className&&) = delete;      \
29 
30 
31 #define DECLARE_SINGLE_INSTANCE(className)  \
32     DECLARE_SINGLE_INSTANCE_BASE(className) \
33 private:                                    \
34     className() = default;                  \
35     ~className() = default;                 \
36 
37 #define IMPLEMENT_SINGLE_INSTANCE(className) \
38 className& className::GetInstance()          \
39 {                                            \
40     static auto instance = new className();  \
41     return *instance;                        \
42 }
43 }; // namespace DistributedSchedule
44 }; // namespace OHOS
45 
46 #endif // FOUNDATION_DISTRIBUTEDSCHEDULE_UTILS_NATIVE_INCLUDE_SINGLE_INSTANCE_H