1 /* 2 * Copyright (c) 2023 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_EDM_SINGLE_INSTANCE_H 17 #define OHOS_EDM_SINGLE_INSTANCE_H 18 19 namespace OHOS { 20 namespace ExternalDeviceManager { 21 #define 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 DECLARE_SINGLE_INSTANCE(className) \ 32 DECLARE_SINGLE_INSTANCE_BASE(className) \ 33 \ 34 private: \ 35 className() = default; \ 36 ~className() = default; 37 38 // please remeber release instance 39 #define IMPLEMENT_SINGLE_INSTANCE(className) \ 40 className &className::GetInstance() \ 41 { \ 42 static auto instance = new className(); \ 43 return *instance; \ 44 } 45 }; // namespace ExternalDeviceManager 46 }; // namespace OHOS 47 #endif 48