1 /* 2 * Copyright (c) 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_MEMORY_MEMMGR_COMMON_INCLUDE_SINGLE_INSTANCE_H 17 #define OHOS_MEMORY_MEMMGR_COMMON_INCLUDE_SINGLE_INSTANCE_H 18 19 namespace OHOS { 20 namespace MemMgr { 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 #define DECLARE_SINGLE_INSTANCE(className) \ 31 DECLARE_SINGLE_INSTANCE_BASE(className) \ 32 private: \ 33 className() = default; \ 34 ~className() = default; \ 35 36 #define IMPLEMENT_SINGLE_INSTANCE(className) \ 37 className& className::GetInstance() \ 38 { \ 39 static auto instance = new className(); \ 40 return *instance; \ 41 } 42 } // namespace MemMgr 43 } // namespace OHOS 44 #endif // OHOS_MEMORY_MEMMGR_COMMON_INCLUDE_SINGLE_INSTANCE_H 45