// Licensed to the Apache Software Foundation (ASF) under one // or more contributor license agreements. See the NOTICE file // distributed with this work for additional information // regarding copyright ownership. The ASF licenses this file // to you under the Apache License, Version 2.0 (the // "License"); you may not use this file except in compliance // with the License. You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, // software distributed under the License is distributed on an // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY // KIND, either express or implied. See the License for the // specific language governing permissions and limitations // under the License. // Date: Fri Sep 7 12:15:23 CST 2018 #ifndef BUTIL_PTR_CONTAINER_H #define BUTIL_PTR_CONTAINER_H namespace butil { // Manage lifetime of a pointer. The key difference between PtrContainer and // unique_ptr is that PtrContainer can be copied and the pointer inside is // deeply copied or constructed on-demand. template <typename T> class PtrContainer { public: PtrContainer() : _ptr(NULL) {} explicit PtrContainer(T* obj) : _ptr(obj) {} ~PtrContainer() { delete _ptr; } PtrContainer(const PtrContainer& rhs) : _ptr(rhs._ptr ? new T(*rhs._ptr) : NULL) {} void operator=(const PtrContainer& rhs) { if (rhs._ptr) { if (_ptr) { *_ptr = *rhs._ptr; } else { _ptr = new T(*rhs._ptr); } } else { delete _ptr; _ptr = NULL; } } T* get() const { return _ptr; } void reset(T* ptr) { delete _ptr; _ptr = ptr; } operator void*() const { return _ptr; } private: T* _ptr; }; } // namespace butil #endif // BUTIL_PTR_CONTAINER_H