| The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 1 | /* |
| 2 | * smartpointer.h |
| 3 | * Android |
| 4 | * |
| 5 | * Copyright 2005 The Android Open Source Project |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #ifndef ANDROID_SMART_POINTER_H |
| 10 | #define ANDROID_SMART_POINTER_H |
| 11 | |
| 12 | #include <stdint.h> |
| 13 | #include <sys/types.h> |
| 14 | #include <stdlib.h> |
| 15 | |
| 16 | // --------------------------------------------------------------------------- |
| 17 | namespace android { |
| 18 | |
| 19 | // --------------------------------------------------------------------------- |
| 20 | |
| 21 | #define COMPARE(_op_) \ |
| 22 | inline bool operator _op_ (const sp<T>& o) const { \ |
| 23 | return m_ptr _op_ o.m_ptr; \ |
| 24 | } \ |
| 25 | inline bool operator _op_ (const T* o) const { \ |
| 26 | return m_ptr _op_ o; \ |
| 27 | } \ |
| 28 | template<typename U> \ |
| 29 | inline bool operator _op_ (const sp<U>& o) const { \ |
| 30 | return m_ptr _op_ o.m_ptr; \ |
| 31 | } \ |
| 32 | template<typename U> \ |
| 33 | inline bool operator _op_ (const U* o) const { \ |
| 34 | return m_ptr _op_ o; \ |
| 35 | } |
| 36 | |
| 37 | // --------------------------------------------------------------------------- |
| 38 | |
| 39 | template <typename T> |
| 40 | class sp |
| 41 | { |
| 42 | public: |
| 43 | inline sp() : m_ptr(0) { } |
| 44 | |
| 45 | sp(T* other); |
| 46 | sp(const sp<T>& other); |
| 47 | template<typename U> sp(U* other); |
| 48 | template<typename U> sp(const sp<U>& other); |
| 49 | |
| 50 | ~sp(); |
| 51 | |
| 52 | // Assignment |
| 53 | |
| 54 | sp& operator = (T* other); |
| 55 | sp& operator = (const sp<T>& other); |
| 56 | |
| 57 | template<typename U> sp& operator = (const sp<U>& other); |
| 58 | template<typename U> sp& operator = (U* other); |
| 59 | |
| 60 | // Reset |
| 61 | void clear(); |
| 62 | |
| 63 | // Accessors |
| 64 | |
| 65 | inline T& operator* () const { return *m_ptr; } |
| 66 | inline T* operator-> () const { return m_ptr; } |
| 67 | inline T* get() const { return m_ptr; } |
| 68 | |
| 69 | // Operators |
| 70 | |
| 71 | COMPARE(==) |
| 72 | COMPARE(!=) |
| 73 | COMPARE(>) |
| 74 | COMPARE(<) |
| 75 | COMPARE(<=) |
| 76 | COMPARE(>=) |
| 77 | |
| 78 | private: |
| 79 | template<typename Y> friend class sp; |
| 80 | |
| 81 | T* m_ptr; |
| 82 | }; |
| 83 | |
| 84 | // --------------------------------------------------------------------------- |
| 85 | // No user serviceable parts below here. |
| 86 | |
| 87 | template<typename T> |
| 88 | sp<T>::sp(T* other) |
| 89 | : m_ptr(other) |
| 90 | { |
| 91 | if (other) other->incStrong(this); |
| 92 | } |
| 93 | |
| 94 | template<typename T> |
| 95 | sp<T>::sp(const sp<T>& other) |
| 96 | : m_ptr(other.m_ptr) |
| 97 | { |
| 98 | if (m_ptr) m_ptr->incStrong(this); |
| 99 | } |
| 100 | |
| 101 | template<typename T> template<typename U> |
| 102 | sp<T>::sp(U* other) : m_ptr(other) |
| 103 | { |
| 104 | if (other) other->incStrong(this); |
| 105 | } |
| 106 | |
| 107 | template<typename T> template<typename U> |
| 108 | sp<T>::sp(const sp<U>& other) |
| 109 | : m_ptr(other.m_ptr) |
| 110 | { |
| 111 | if (m_ptr) m_ptr->incStrong(this); |
| 112 | } |
| 113 | |
| 114 | template<typename T> |
| 115 | sp<T>::~sp() |
| 116 | { |
| 117 | if (m_ptr) m_ptr->decStrong(this); |
| 118 | } |
| 119 | |
| 120 | template<typename T> |
| 121 | sp<T>& sp<T>::operator = (const sp<T>& other) { |
| 122 | if (other.m_ptr) other.m_ptr->incStrong(this); |
| 123 | if (m_ptr) m_ptr->decStrong(this); |
| 124 | m_ptr = other.m_ptr; |
| 125 | return *this; |
| 126 | } |
| 127 | |
| 128 | template<typename T> |
| 129 | sp<T>& sp<T>::operator = (T* other) |
| 130 | { |
| 131 | if (other) other->incStrong(this); |
| 132 | if (m_ptr) m_ptr->decStrong(this); |
| 133 | m_ptr = other; |
| 134 | return *this; |
| 135 | } |
| 136 | |
| 137 | template<typename T> template<typename U> |
| 138 | sp<T>& sp<T>::operator = (const sp<U>& other) |
| 139 | { |
| 140 | if (other.m_ptr) other.m_ptr->incStrong(this); |
| 141 | if (m_ptr) m_ptr->decStrong(this); |
| 142 | m_ptr = other.m_ptr; |
| 143 | return *this; |
| 144 | } |
| 145 | |
| 146 | template<typename T> template<typename U> |
| 147 | sp<T>& sp<T>::operator = (U* other) |
| 148 | { |
| 149 | if (other) other->incStrong(this); |
| 150 | if (m_ptr) m_ptr->decStrong(this); |
| 151 | m_ptr = other; |
| 152 | return *this; |
| 153 | } |
| 154 | |
| 155 | template<typename T> |
| 156 | void sp<T>::clear() |
| 157 | { |
| 158 | if (m_ptr) { |
| 159 | m_ptr->decStrong(this); |
| 160 | m_ptr = 0; |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | // --------------------------------------------------------------------------- |
| 165 | |
| 166 | }; // namespace android |
| 167 | |
| 168 | // --------------------------------------------------------------------------- |
| 169 | |
| 170 | #endif // ANDROID_SMART_POINTER_H |