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Side by Side Diff: base/linked_ptr.h

Issue 552004: Style cleanup in preparation for auto-linting base/. (Closed)
Patch Set: Created 10 years, 11 months ago
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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 // 4 //
5 // A "smart" pointer type with reference tracking. Every pointer to a 5 // A "smart" pointer type with reference tracking. Every pointer to a
6 // particular object is kept on a circular linked list. When the last pointer 6 // particular object is kept on a circular linked list. When the last pointer
7 // to an object is destroyed or reassigned, the object is deleted. 7 // to an object is destroyed or reassigned, the object is deleted.
8 // 8 //
9 // Used properly, this deletes the object when the last reference goes away. 9 // Used properly, this deletes the object when the last reference goes away.
10 // There are several caveats: 10 // There are several caveats:
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78 public: 78 public:
79 typedef T element_type; 79 typedef T element_type;
80 80
81 // Take over ownership of a raw pointer. This should happen as soon as 81 // Take over ownership of a raw pointer. This should happen as soon as
82 // possible after the object is created. 82 // possible after the object is created.
83 explicit linked_ptr(T* ptr = NULL) { capture(ptr); } 83 explicit linked_ptr(T* ptr = NULL) { capture(ptr); }
84 ~linked_ptr() { depart(); } 84 ~linked_ptr() { depart(); }
85 85
86 // Copy an existing linked_ptr<>, adding ourselves to the list of references. 86 // Copy an existing linked_ptr<>, adding ourselves to the list of references.
87 template <typename U> linked_ptr(linked_ptr<U> const& ptr) { copy(&ptr); } 87 template <typename U> linked_ptr(linked_ptr<U> const& ptr) { copy(&ptr); }
88 linked_ptr(linked_ptr const& ptr) { DCHECK_NE(&ptr, this); copy(&ptr); } 88
89 linked_ptr(linked_ptr const& ptr) {
90 DCHECK_NE(&ptr, this);
91 copy(&ptr);
92 }
89 93
90 // Assignment releases the old value and acquires the new. 94 // Assignment releases the old value and acquires the new.
91 template <typename U> linked_ptr& operator=(linked_ptr<U> const& ptr) { 95 template <typename U> linked_ptr& operator=(linked_ptr<U> const& ptr) {
92 depart(); 96 depart();
93 copy(&ptr); 97 copy(&ptr);
94 return *this; 98 return *this;
95 } 99 }
96 100
97 linked_ptr& operator=(linked_ptr const& ptr) { 101 linked_ptr& operator=(linked_ptr const& ptr) {
98 if (&ptr != this) { 102 if (&ptr != this) {
99 depart(); 103 depart();
100 copy(&ptr); 104 copy(&ptr);
101 } 105 }
102 return *this; 106 return *this;
103 } 107 }
104 108
105 // Smart pointer members. 109 // Smart pointer members.
106 void reset(T* ptr = NULL) { depart(); capture(ptr); } 110 void reset(T* ptr = NULL) {
111 depart();
112 capture(ptr);
113 }
107 T* get() const { return value_; } 114 T* get() const { return value_; }
108 T* operator->() const { return value_; } 115 T* operator->() const { return value_; }
109 T& operator*() const { return *value_; } 116 T& operator*() const { return *value_; }
110 // Release ownership of the pointed object and returns it. 117 // Release ownership of the pointed object and returns it.
111 // Sole ownership by this linked_ptr object is required. 118 // Sole ownership by this linked_ptr object is required.
112 T* release() { 119 T* release() {
113 bool last = link_.depart(); 120 bool last = link_.depart();
114 CHECK(last); 121 CHECK(last);
115 T* v = value_; 122 T* v = value_;
116 value_ = NULL; 123 value_ = NULL;
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165 172
166 // A function to convert T* into linked_ptr<T> 173 // A function to convert T* into linked_ptr<T>
167 // Doing e.g. make_linked_ptr(new FooBarBaz<type>(arg)) is a shorter notation 174 // Doing e.g. make_linked_ptr(new FooBarBaz<type>(arg)) is a shorter notation
168 // for linked_ptr<FooBarBaz<type> >(new FooBarBaz<type>(arg)) 175 // for linked_ptr<FooBarBaz<type> >(new FooBarBaz<type>(arg))
169 template <typename T> 176 template <typename T>
170 linked_ptr<T> make_linked_ptr(T* ptr) { 177 linked_ptr<T> make_linked_ptr(T* ptr) {
171 return linked_ptr<T>(ptr); 178 return linked_ptr<T>(ptr);
172 } 179 }
173 180
174 #endif // BASE_LINKED_PTR_H_ 181 #endif // BASE_LINKED_PTR_H_
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