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