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1 /* | |
2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license | |
5 * that can be found in the LICENSE file in the root of the source | |
6 * tree. An additional intellectual property rights grant can be found | |
7 * in the file PATENTS. All contributing project authors may | |
8 * be found in the AUTHORS file in the root of the source tree. | |
9 */ | |
10 | |
11 // Borrowed from Chromium's src/base/memory/scoped_vector.h. | |
12 | |
13 #ifndef WEBRTC_SYSTEM_WRAPPERS_INCLUDE_SCOPED_VECTOR_H_ | |
14 #define WEBRTC_SYSTEM_WRAPPERS_INCLUDE_SCOPED_VECTOR_H_ | |
15 | |
16 #include <vector> | |
17 | |
18 #include "webrtc/base/checks.h" | |
19 #include "webrtc/system_wrappers/include/stl_util.h" | |
20 | |
21 namespace webrtc { | |
22 | |
23 // ScopedVector wraps a vector deleting the elements from its | |
24 // destructor. | |
25 template <class T> | |
26 class ScopedVector { | |
27 public: | |
28 typedef typename std::vector<T*>::allocator_type allocator_type; | |
29 typedef typename std::vector<T*>::size_type size_type; | |
30 typedef typename std::vector<T*>::difference_type difference_type; | |
31 typedef typename std::vector<T*>::pointer pointer; | |
32 typedef typename std::vector<T*>::const_pointer const_pointer; | |
33 typedef typename std::vector<T*>::reference reference; | |
34 typedef typename std::vector<T*>::const_reference const_reference; | |
35 typedef typename std::vector<T*>::value_type value_type; | |
36 typedef typename std::vector<T*>::iterator iterator; | |
37 typedef typename std::vector<T*>::const_iterator const_iterator; | |
38 typedef typename std::vector<T*>::reverse_iterator reverse_iterator; | |
39 typedef typename std::vector<T*>::const_reverse_iterator | |
40 const_reverse_iterator; | |
41 | |
42 ScopedVector() {} | |
43 ~ScopedVector() { clear(); } | |
44 | |
45 // Move construction and assignment. | |
46 ScopedVector(ScopedVector&& other) { *this = std::move(other); } | |
47 ScopedVector& operator=(ScopedVector&& other) { | |
48 std::swap(v_, other.v_); // The arguments are std::vectors, so std::swap | |
49 // is the one that we want. | |
50 other.clear(); | |
51 return *this; | |
52 } | |
53 | |
54 // Deleted copy constructor and copy assignment, to make the type move-only. | |
55 ScopedVector(const ScopedVector& other) = delete; | |
56 ScopedVector& operator=(const ScopedVector& other) = delete; | |
57 | |
58 reference operator[](size_t index) { return v_[index]; } | |
59 const_reference operator[](size_t index) const { return v_[index]; } | |
60 | |
61 bool empty() const { return v_.empty(); } | |
62 size_t size() const { return v_.size(); } | |
63 | |
64 reverse_iterator rbegin() { return v_.rbegin(); } | |
65 const_reverse_iterator rbegin() const { return v_.rbegin(); } | |
66 reverse_iterator rend() { return v_.rend(); } | |
67 const_reverse_iterator rend() const { return v_.rend(); } | |
68 | |
69 iterator begin() { return v_.begin(); } | |
70 const_iterator begin() const { return v_.begin(); } | |
71 iterator end() { return v_.end(); } | |
72 const_iterator end() const { return v_.end(); } | |
73 | |
74 const_reference front() const { return v_.front(); } | |
75 reference front() { return v_.front(); } | |
76 const_reference back() const { return v_.back(); } | |
77 reference back() { return v_.back(); } | |
78 | |
79 void push_back(T* elem) { v_.push_back(elem); } | |
80 | |
81 void pop_back() { | |
82 RTC_DCHECK(!empty()); | |
83 delete v_.back(); | |
84 v_.pop_back(); | |
85 } | |
86 | |
87 std::vector<T*>& get() { return v_; } | |
88 const std::vector<T*>& get() const { return v_; } | |
89 void swap(std::vector<T*>& other) { v_.swap(other); } | |
90 void swap(ScopedVector<T>& other) { v_.swap(other.v_); } | |
91 void release(std::vector<T*>* out) { | |
92 out->swap(v_); | |
93 v_.clear(); | |
94 } | |
95 | |
96 void reserve(size_t capacity) { v_.reserve(capacity); } | |
97 | |
98 // Resize, deleting elements in the disappearing range if we are shrinking. | |
99 void resize(size_t new_size) { | |
100 if (v_.size() > new_size) | |
101 STLDeleteContainerPointers(v_.begin() + new_size, v_.end()); | |
102 v_.resize(new_size); | |
103 } | |
104 | |
105 template<typename InputIterator> | |
106 void assign(InputIterator begin, InputIterator end) { | |
107 v_.assign(begin, end); | |
108 } | |
109 | |
110 void clear() { STLDeleteElements(&v_); } | |
111 | |
112 // Like |clear()|, but doesn't delete any elements. | |
113 void weak_clear() { v_.clear(); } | |
114 | |
115 // Lets the ScopedVector take ownership of |x|. | |
116 iterator insert(iterator position, T* x) { | |
117 return v_.insert(position, x); | |
118 } | |
119 | |
120 // Lets the ScopedVector take ownership of elements in [first,last). | |
121 template<typename InputIterator> | |
122 void insert(iterator position, InputIterator first, InputIterator last) { | |
123 v_.insert(position, first, last); | |
124 } | |
125 | |
126 iterator erase(iterator position) { | |
127 delete *position; | |
128 return v_.erase(position); | |
129 } | |
130 | |
131 iterator erase(iterator first, iterator last) { | |
132 STLDeleteContainerPointers(first, last); | |
133 return v_.erase(first, last); | |
134 } | |
135 | |
136 // Like |erase()|, but doesn't delete the element at |position|. | |
137 iterator weak_erase(iterator position) { | |
138 return v_.erase(position); | |
139 } | |
140 | |
141 // Like |erase()|, but doesn't delete the elements in [first, last). | |
142 iterator weak_erase(iterator first, iterator last) { | |
143 return v_.erase(first, last); | |
144 } | |
145 | |
146 private: | |
147 std::vector<T*> v_; | |
148 }; | |
149 | |
150 } // namespace webrtc | |
151 | |
152 #endif // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_SCOPED_VECTOR_H_ | |
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