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 RENDER_SERVICE_BASE_COMMON_RS_SINGLETON_H
17 #define RENDER_SERVICE_BASE_COMMON_RS_SINGLETON_H
18 
19 namespace OHOS {
20 namespace Rosen {
21 
22 #define RS_DECLARE_SINGLETON(MyClass)             \
23 private:                                          \
24     friend RSSingleton<MyClass>;                  \
25     MyClass &operator=(const MyClass &) = delete; \
26     MyClass(const MyClass &) = delete;            \
27     MyClass();                                    \
28     ~MyClass();
29 
30 template <typename T>
31 class RSSingleton {
32 public:
GetInstance()33     static T& GetInstance()
34     {
35         return instance_;
36     }
37 
38 protected:
39     RSSingleton() = default;
40     virtual ~RSSingleton() = default;
41 
42 private:
43     RSSingleton(const RSSingleton&) = delete;
44     RSSingleton& operator=(const RSSingleton&) = delete;
45     RSSingleton(RSSingleton&&) = delete;
46     RSSingleton& operator=(RSSingleton&&) = delete;
47 
48     static T instance_;
49 };
50 
51 template <typename T>
52 T RSSingleton<T>::instance_;
53 
54 } // namespace Rosen
55 } // namespace OHOS
56 
57 #endif // RENDER_SERVICE_BASE_COMMON_RS_SINGLETON_H
58