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Side by Side Diff: src/smart-pointers.h

Issue 101763003: Replace 'operator*' with explicit 'get' method on SmartPointer (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Reupload to make rietveld happy Created 7 years ago
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1 // Copyright 2011 the V8 project authors. All rights reserved. 1 // Copyright 2011 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
(...skipping 18 matching lines...) Expand all
29 #define V8_SMART_POINTERS_H_ 29 #define V8_SMART_POINTERS_H_
30 30
31 namespace v8 { 31 namespace v8 {
32 namespace internal { 32 namespace internal {
33 33
34 34
35 template<typename Deallocator, typename T> 35 template<typename Deallocator, typename T>
36 class SmartPointerBase { 36 class SmartPointerBase {
37 public: 37 public:
38 // Default constructor. Constructs an empty scoped pointer. 38 // Default constructor. Constructs an empty scoped pointer.
39 inline SmartPointerBase() : p_(NULL) {} 39 SmartPointerBase() : p_(NULL) {}
40 40
41 // Constructs a scoped pointer from a plain one. 41 // Constructs a scoped pointer from a plain one.
42 explicit inline SmartPointerBase(T* ptr) : p_(ptr) {} 42 explicit SmartPointerBase(T* ptr) : p_(ptr) {}
43 43
44 // Copy constructor removes the pointer from the original to avoid double 44 // Copy constructor removes the pointer from the original to avoid double
45 // freeing. 45 // freeing.
46 inline SmartPointerBase(const SmartPointerBase<Deallocator, T>& rhs) 46 SmartPointerBase(const SmartPointerBase<Deallocator, T>& rhs)
47 : p_(rhs.p_) { 47 : p_(rhs.p_) {
48 const_cast<SmartPointerBase<Deallocator, T>&>(rhs).p_ = NULL; 48 const_cast<SmartPointerBase<Deallocator, T>&>(rhs).p_ = NULL;
49 } 49 }
50 50
51 // When the destructor of the scoped pointer is executed the plain pointer 51 T* operator->() const { return p_; }
52 // is deleted using DeleteArray. This implies that you must allocate with
53 // NewArray.
54 inline ~SmartPointerBase() { if (p_) Deallocator::Delete(p_); }
55 52
56 inline T* operator->() const { return p_; } 53 T& operator*() const { return *p_; }
57 54
58 // You can get the underlying pointer out with the * operator. 55 T* get() const { return p_; }
59 inline T* operator*() { return p_; }
60 56
61 // You can use [n] to index as if it was a plain pointer. 57 // You can use [n] to index as if it was a plain pointer.
62 inline T& operator[](size_t i) { 58 T& operator[](size_t i) {
63 return p_[i]; 59 return p_[i];
64 } 60 }
65 61
66 // You can use [n] to index as if it was a plain pointer. 62 // You can use [n] to index as if it was a plain pointer.
67 const inline T& operator[](size_t i) const { 63 const T& operator[](size_t i) const {
68 return p_[i]; 64 return p_[i];
69 } 65 }
70 66
71 // We don't have implicit conversion to a T* since that hinders migration: 67 // We don't have implicit conversion to a T* since that hinders migration:
72 // You would not be able to change a method from returning a T* to 68 // You would not be able to change a method from returning a T* to
73 // returning an SmartArrayPointer<T> and then get errors wherever it is used. 69 // returning an SmartArrayPointer<T> and then get errors wherever it is used.
74 70
75 71
76 // If you want to take out the plain pointer and don't want it automatically 72 // If you want to take out the plain pointer and don't want it automatically
77 // deleted then call Detach(). Afterwards, the smart pointer is empty 73 // deleted then call Detach(). Afterwards, the smart pointer is empty
78 // (NULL). 74 // (NULL).
79 inline T* Detach() { 75 T* Detach() {
80 T* temp = p_; 76 T* temp = p_;
81 p_ = NULL; 77 p_ = NULL;
82 return temp; 78 return temp;
83 } 79 }
84 80
85 inline void Reset(T* new_value) { 81 void Reset(T* new_value) {
82 ASSERT(p_ == NULL || p_ != new_value);
86 if (p_) Deallocator::Delete(p_); 83 if (p_) Deallocator::Delete(p_);
87 p_ = new_value; 84 p_ = new_value;
88 } 85 }
89 86
90 // Assignment requires an empty (NULL) SmartArrayPointer as the receiver. Like 87 // Assignment requires an empty (NULL) SmartArrayPointer as the receiver. Like
91 // the copy constructor it removes the pointer in the original to avoid 88 // the copy constructor it removes the pointer in the original to avoid
92 // double freeing. 89 // double freeing.
93 inline SmartPointerBase<Deallocator, T>& operator=( 90 SmartPointerBase<Deallocator, T>& operator=(
94 const SmartPointerBase<Deallocator, T>& rhs) { 91 const SmartPointerBase<Deallocator, T>& rhs) {
95 ASSERT(is_empty()); 92 ASSERT(is_empty());
96 T* tmp = rhs.p_; // swap to handle self-assignment 93 T* tmp = rhs.p_; // swap to handle self-assignment
97 const_cast<SmartPointerBase<Deallocator, T>&>(rhs).p_ = NULL; 94 const_cast<SmartPointerBase<Deallocator, T>&>(rhs).p_ = NULL;
98 p_ = tmp; 95 p_ = tmp;
99 return *this; 96 return *this;
100 } 97 }
101 98
102 inline bool is_empty() { return p_ == NULL; } 99 bool is_empty() const { return p_ == NULL; }
100
101 protected:
102 // When the destructor of the scoped pointer is executed the plain pointer
103 // is deleted using DeleteArray. This implies that you must allocate with
104 // NewArray.
105 ~SmartPointerBase() { if (p_) Deallocator::Delete(p_); }
103 106
104 private: 107 private:
105 T* p_; 108 T* p_;
106 }; 109 };
107 110
108 // A 'scoped array pointer' that calls DeleteArray on its pointer when the 111 // A 'scoped array pointer' that calls DeleteArray on its pointer when the
109 // destructor is called. 112 // destructor is called.
110 113
111 template<typename T> 114 template<typename T>
112 struct ArrayDeallocator { 115 struct ArrayDeallocator {
113 static void Delete(T* array) { 116 static void Delete(T* array) {
114 DeleteArray(array); 117 DeleteArray(array);
115 } 118 }
116 }; 119 };
117 120
118 121
119 template<typename T> 122 template<typename T>
120 class SmartArrayPointer: public SmartPointerBase<ArrayDeallocator<T>, T> { 123 class SmartArrayPointer: public SmartPointerBase<ArrayDeallocator<T>, T> {
121 public: 124 public:
122 inline SmartArrayPointer() { } 125 SmartArrayPointer() { }
123 explicit inline SmartArrayPointer(T* ptr) 126 explicit SmartArrayPointer(T* ptr)
124 : SmartPointerBase<ArrayDeallocator<T>, T>(ptr) { } 127 : SmartPointerBase<ArrayDeallocator<T>, T>(ptr) { }
125 inline SmartArrayPointer(const SmartArrayPointer<T>& rhs) 128 SmartArrayPointer(const SmartArrayPointer<T>& rhs)
126 : SmartPointerBase<ArrayDeallocator<T>, T>(rhs) { } 129 : SmartPointerBase<ArrayDeallocator<T>, T>(rhs) { }
127 }; 130 };
128 131
129 132
130 template<typename T> 133 template<typename T>
131 struct ObjectDeallocator { 134 struct ObjectDeallocator {
132 static void Delete(T* object) { 135 static void Delete(T* object) {
133 delete object; 136 delete object;
134 } 137 }
135 }; 138 };
136 139
137 140
138 template<typename T> 141 template<typename T>
139 class SmartPointer: public SmartPointerBase<ObjectDeallocator<T>, T> { 142 class SmartPointer: public SmartPointerBase<ObjectDeallocator<T>, T> {
140 public: 143 public:
141 inline SmartPointer() { } 144 SmartPointer() { }
142 explicit inline SmartPointer(T* ptr) 145 explicit SmartPointer(T* ptr)
143 : SmartPointerBase<ObjectDeallocator<T>, T>(ptr) { } 146 : SmartPointerBase<ObjectDeallocator<T>, T>(ptr) { }
144 inline SmartPointer(const SmartPointer<T>& rhs) 147 SmartPointer(const SmartPointer<T>& rhs)
145 : SmartPointerBase<ObjectDeallocator<T>, T>(rhs) { } 148 : SmartPointerBase<ObjectDeallocator<T>, T>(rhs) { }
146 }; 149 };
147 150
148 } } // namespace v8::internal 151 } } // namespace v8::internal
149 152
150 #endif // V8_SMART_POINTERS_H_ 153 #endif // V8_SMART_POINTERS_H_
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