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_ACE_FRAMEWORKS_BASE_UTILS_SINGLETON_H
17 #define FOUNDATION_ACE_FRAMEWORKS_BASE_UTILS_SINGLETON_H
18 
19 #include "base/utils/noncopyable.h"
20 
21 namespace OHOS::Ace {
22 
23 #define DECLARE_SINGLETON(MyClass)               \
24 private:                                         \
25     friend Singleton<MyClass>;                   \
26     MyClass& operator=(const MyClass&) = delete; \
27     MyClass(const MyClass&) = delete;            \
28     MyClass();                                   \
29     ~MyClass();
30 
31 template<typename T>
32 class Singleton : public NonCopyable {
33 public:
GetInstance()34     static T& GetInstance()
35     {
36         return instance_;
37     }
38 
39 private:
40     static T instance_;
41 };
42 
43 template<typename T>
44 T Singleton<T>::instance_;
45 
46 } // namespace OHOS::Ace
47 
48 #endif // FOUNDATION_ACE_FRAMEWORKS_BASE_UTILS_SINGLETON_H
49