1 /*
2  * Copyright (c) 2022-2024 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_DM_SINGLE_INSTANCE_H
17 #define OHOS_DM_SINGLE_INSTANCE_H
18 
19 namespace OHOS {
20 namespace DistributedHardware {
21 #define DM_DECLARE_SINGLE_INSTANCE_BASE(className)       \
22 public:                                               \
23     static className &GetInstance();                  \
24                                                       \
25 private:                                              \
26     className(const className &) = delete;            \
27     className &operator=(const className &) = delete; \
28     className(className &&) = delete;                 \
29     className &operator=(className &&) = delete;
30 
31 #define DM_DECLARE_SINGLE_INSTANCE(className)  \
32     DM_DECLARE_SINGLE_INSTANCE_BASE(className) \
33                                             \
34 private:                                    \
35     className() = default;                  \
36     ~className() = default;
37 
38 #define DM_IMPLEMENT_SINGLE_INSTANCE(className)    \
39     className &className::GetInstance()         \
40     {                                           \
41         static auto instance = new className(); \
42         return *instance;                       \
43     }
44 }; // namespace DistributedHardware
45 }; // namespace OHOS
46 #endif // OHOS_DM_SINGLE_INSTANCE_H
47