1 /*
2  * Copyright (c) 2021-2022 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_DISTRIBUTED_HARDWARE_SINGLE_INSTANCE_H
17 #define OHOS_DISTRIBUTED_HARDWARE_SINGLE_INSTANCE_H
18 
19 namespace OHOS {
20 namespace DistributedHardware {
21 #define REMOVE_NO_USE_CONSTRUCTOR(className)            \
22 private:                                                \
23     className(const className&) = delete;               \
24     className& operator= (const className&) = delete;   \
25     className(className&&) = delete;                    \
26     className& operator= (className&&) = delete;        \
27 
28 #define DECLARE_SINGLE_INSTANCE_BASE(className)         \
29 public:                                                 \
30     static className & GetInstance();                   \
31 private:                                                \
32     className(const className&) = delete;               \
33     className& operator= (const className&) = delete;   \
34     className(className&&) = delete;                    \
35     className& operator= (className&&) = delete;        \
36 
37 #define DECLARE_SINGLE_INSTANCE(className)              \
38     DECLARE_SINGLE_INSTANCE_BASE(className)             \
39 private:                                                \
40     className() = default;                              \
41     virtual ~className() = default;                     \
42 
43 #define IMPLEMENT_SINGLE_INSTANCE(className)            \
44 className & className::GetInstance()                    \
45 {                                                       \
46     static className instance;                          \
47     return instance;                                    \
48 }
49 } // namespace DistributedHardware
50 } // namespace OHOS
51 #endif // OHOS_DISTRIBUTED_HARDWARE_SINGLE_INSTANCE_H
52