1 | // Licensed to the Apache Software Foundation (ASF) under one |
2 | // or more contributor license agreements. See the NOTICE file |
3 | // distributed with this work for additional information |
4 | // regarding copyright ownership. The ASF licenses this file |
5 | // to you under the Apache License, Version 2.0 (the |
6 | // "License"); you may not use this file except in compliance |
7 | // with the License. You may obtain a copy of the License at |
8 | // |
9 | // http://www.apache.org/licenses/LICENSE-2.0 |
10 | // |
11 | // Unless required by applicable law or agreed to in writing, |
12 | // software distributed under the License is distributed on an |
13 | // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
14 | // KIND, either express or implied. See the License for the |
15 | // specific language governing permissions and limitations |
16 | // under the License. |
17 | |
18 | // Date: Fri Sep 7 12:15:23 CST 2018 |
19 | |
20 | #ifndef BUTIL_PTR_CONTAINER_H |
21 | #define BUTIL_PTR_CONTAINER_H |
22 | |
23 | namespace butil { |
24 | |
25 | // Manage lifetime of a pointer. The key difference between PtrContainer and |
26 | // unique_ptr is that PtrContainer can be copied and the pointer inside is |
27 | // deeply copied or constructed on-demand. |
28 | template <typename T> |
29 | class PtrContainer { |
30 | public: |
31 | PtrContainer() : _ptr(NULL) {} |
32 | |
33 | explicit PtrContainer(T* obj) : _ptr(obj) {} |
34 | |
35 | ~PtrContainer() { |
36 | delete _ptr; |
37 | } |
38 | |
39 | PtrContainer(const PtrContainer& rhs) |
40 | : _ptr(rhs._ptr ? new T(*rhs._ptr) : NULL) {} |
41 | |
42 | void operator=(const PtrContainer& rhs) { |
43 | if (rhs._ptr) { |
44 | if (_ptr) { |
45 | *_ptr = *rhs._ptr; |
46 | } else { |
47 | _ptr = new T(*rhs._ptr); |
48 | } |
49 | } else { |
50 | delete _ptr; |
51 | _ptr = NULL; |
52 | } |
53 | } |
54 | |
55 | T* get() const { return _ptr; } |
56 | |
57 | void reset(T* ptr) { |
58 | delete _ptr; |
59 | _ptr = ptr; |
60 | } |
61 | |
62 | operator void*() const { return _ptr; } |
63 | |
64 | private: |
65 | T* _ptr; |
66 | }; |
67 | |
68 | } // namespace butil |
69 | |
70 | #endif // BUTIL_PTR_CONTAINER_H |
71 | |