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 COMMON_COMPONENTS_BASE_IMMORTAL_WRAPPER_H 17 #define COMMON_COMPONENTS_BASE_IMMORTAL_WRAPPER_H 18 19 #include <new> 20 #include <utility> 21 22 namespace common { 23 // Utility class ensuring ordered destruction of static global objects to prevent dependency-related issues during 24 // program termination. 25 template<class Type> 26 class ImmortalWrapper { 27 public: 28 template<class... Args> ImmortalWrapper(Args &&...args)29 ImmortalWrapper(Args&&... args) 30 { 31 new (buffer_) Type(std::forward<Args>(args)...); 32 } 33 ImmortalWrapper(const ImmortalWrapper&) = delete; 34 ImmortalWrapper& operator=(const ImmortalWrapper&) = delete; 35 ~ImmortalWrapper() = default; 36 inline typename std::add_pointer<Type>::type operator->() 37 { 38 return reinterpret_cast<typename std::add_pointer<Type>::type>(buffer_); 39 } 40 41 inline typename std::add_lvalue_reference<Type>::type operator*() 42 { 43 return reinterpret_cast<typename std::add_lvalue_reference<Type>::type>(buffer_); 44 } 45 46 private: 47 alignas(Type) unsigned char buffer_[sizeof(Type)] = { 0 }; 48 }; 49 } // namespace common 50 #endif // COMMON_COMPONENTS_BASE_IMMORTAL_WRAPPER_H 51