1 /* 2 * Copyright (c) 2022-2024 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_DM_SINGLE_INSTANCE_H 17 #define OHOS_DM_SINGLE_INSTANCE_H 18 19 #ifndef DM_EXPORT 20 #define DM_EXPORT __attribute__ ((visibility ("default"))) 21 #endif // DM_EXPORT 22 23 namespace OHOS { 24 namespace DistributedHardware { 25 #define DM_DECLARE_SINGLE_INSTANCE_BASE(className) \ 26 public: \ 27 DM_EXPORT static className &GetInstance(); \ 28 \ 29 private: \ 30 className(const className &) = delete; \ 31 className &operator=(const className &) = delete; \ 32 className(className &&) = delete; \ 33 className &operator=(className &&) = delete; 34 35 #define DM_DECLARE_SINGLE_INSTANCE(className) \ 36 DM_DECLARE_SINGLE_INSTANCE_BASE(className) \ 37 \ 38 private: \ 39 className() = default; \ 40 ~className() = default; 41 42 #define DM_IMPLEMENT_SINGLE_INSTANCE(className) \ 43 DM_EXPORT className &className::GetInstance() \ 44 { \ 45 static auto instance = new className(); \ 46 return *instance; \ 47 } 48 }; // namespace DistributedHardware 49 }; // namespace OHOS 50 #endif // OHOS_DM_SINGLE_INSTANCE_H 51