1 /* 2 * Copyright (c) 2025 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 SCOPE_GUARD_H 17 #define SCOPE_GUARD_H 18 19 namespace OHOS { 20 namespace HDI { 21 namespace Usb { 22 template<typename ExitAction> class ScopeGuard { 23 public: ScopeGuard(ExitAction && action)24 ScopeGuard(ExitAction &&action) : action_(std::forward<ExitAction>(action)), enable_(true) {} ~ScopeGuard()25 ~ScopeGuard() 26 { 27 if (enable_) { 28 action_(); 29 } 30 } 31 Disable()32 void Disable() 33 { 34 enable_ = false; 35 } 36 37 private: 38 ExitAction action_; 39 bool enable_; 40 }; 41 42 struct ScopeExitGuardHelper {}; 43 template<typename ExitAction> 44 static inline ScopeGuard<ExitAction> operator + (ScopeExitGuardHelper, ExitAction &&action) 45 { 46 return ScopeGuard<ExitAction>(std::forward<ExitAction>(action)); 47 } 48 49 #define ON_SCOPE_EXIT(id) auto onScopeExitGuard##id = ScopeExitGuardHelper {} + [ & ] 50 51 #define CANCEL_SCOPE_EXIT_GUARD(id) onScopeExitGuard##id.Disable() 52 53 } // namespace Usb 54 } // namespace HDI 55 } // namespace OHOS 56 57 #endif // SCOPE_GUARD_H 58