// Copyright (c) 2018 brpc authors. // // Licensed 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. // Author: Ge,Jun (jge666@gmail.com) // 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