1 /* 2 * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. 3 * Copyright (C) 2008 Collabora Ltd. 4 * Copyright (C) 2009 Martin Robinson 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Library General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Library General Public License for more details. 15 * 16 * You should have received a copy of the GNU Library General Public License 17 * along with this library; see the file COPYING.LIB. If not, write to 18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA. 20 * 21 */ 22 23 #ifndef WTF_GRefPtr_h 24 #define WTF_GRefPtr_h 25 26 #include "AlwaysInline.h" 27 #include <algorithm> 28 29 typedef struct _GHashTable GHashTable; 30 31 namespace WTF { 32 33 enum GRefPtrAdoptType { GRefPtrAdopt }; 34 template <typename T> inline T* refGPtr(T*); 35 template <typename T> inline void derefGPtr(T*); 36 template <typename T> class GRefPtr; 37 template <typename T> GRefPtr<T> adoptGRef(T*); 38 template <> GHashTable* refGPtr(GHashTable* ptr); 39 template <> void derefGPtr(GHashTable* ptr); 40 41 template <typename T> class GRefPtr { 42 public: 43 GRefPtr() : m_ptr(0) { } 44 GRefPtr(T* ptr) : m_ptr(ptr) { if (ptr) refGPtr(ptr); } 45 GRefPtr(const GRefPtr& o) : m_ptr(o.m_ptr) { if (T* ptr = m_ptr) refGPtr(ptr); } 46 template <typename U> GRefPtr(const GRefPtr<U>& o) : m_ptr(o.get()) { if (T* ptr = m_ptr) refGPtr(ptr); } 47 48 ~GRefPtr() { if (T* ptr = m_ptr) derefGPtr(ptr); } 49 50 void clear() 51 { 52 if (T* ptr = m_ptr) 53 derefGPtr(ptr); 54 m_ptr = 0; 55 } 56 57 T* get() const { return m_ptr; } 58 T& operator*() const { return *m_ptr; } 59 ALWAYS_INLINE T* operator->() const { return m_ptr; } 60 61 bool operator!() const { return !m_ptr; } 62 63 // This conversion operator allows implicit conversion to bool but not to other integer types. 64 typedef T* GRefPtr::*UnspecifiedBoolType; 65 operator UnspecifiedBoolType() const { return m_ptr ? &GRefPtr::m_ptr : 0; } 66 67 GRefPtr& operator=(const GRefPtr&); 68 GRefPtr& operator=(T*); 69 template <typename U> GRefPtr& operator=(const GRefPtr<U>&); 70 71 void swap(GRefPtr&); 72 friend GRefPtr adoptGRef<T>(T*); 73 74 private: 75 static T* hashTableDeletedValue() { return reinterpret_cast<T*>(-1); } 76 // Adopting constructor. 77 GRefPtr(T* ptr, GRefPtrAdoptType) : m_ptr(ptr) {} 78 79 T* m_ptr; 80 }; 81 82 template <typename T> inline GRefPtr<T>& GRefPtr<T>::operator=(const GRefPtr<T>& o) 83 { 84 T* optr = o.get(); 85 if (optr) 86 refGPtr(optr); 87 T* ptr = m_ptr; 88 m_ptr = optr; 89 if (ptr) 90 derefGPtr(ptr); 91 return *this; 92 } 93 94 template <typename T> inline GRefPtr<T>& GRefPtr<T>::operator=(T* optr) 95 { 96 T* ptr = m_ptr; 97 if (optr) 98 refGPtr(optr); 99 m_ptr = optr; 100 if (ptr) 101 derefGPtr(ptr); 102 return *this; 103 } 104 105 template <class T> inline void GRefPtr<T>::swap(GRefPtr<T>& o) 106 { 107 std::swap(m_ptr, o.m_ptr); 108 } 109 110 template <class T> inline void swap(GRefPtr<T>& a, GRefPtr<T>& b) 111 { 112 a.swap(b); 113 } 114 115 template <typename T, typename U> inline bool operator==(const GRefPtr<T>& a, const GRefPtr<U>& b) 116 { 117 return a.get() == b.get(); 118 } 119 120 template <typename T, typename U> inline bool operator==(const GRefPtr<T>& a, U* b) 121 { 122 return a.get() == b; 123 } 124 125 template <typename T, typename U> inline bool operator==(T* a, const GRefPtr<U>& b) 126 { 127 return a == b.get(); 128 } 129 130 template <typename T, typename U> inline bool operator!=(const GRefPtr<T>& a, const GRefPtr<U>& b) 131 { 132 return a.get() != b.get(); 133 } 134 135 template <typename T, typename U> inline bool operator!=(const GRefPtr<T>& a, U* b) 136 { 137 return a.get() != b; 138 } 139 140 template <typename T, typename U> inline bool operator!=(T* a, const GRefPtr<U>& b) 141 { 142 return a != b.get(); 143 } 144 145 template <typename T, typename U> inline GRefPtr<T> static_pointer_cast(const GRefPtr<U>& p) 146 { 147 return GRefPtr<T>(static_cast<T*>(p.get())); 148 } 149 150 template <typename T, typename U> inline GRefPtr<T> const_pointer_cast(const GRefPtr<U>& p) 151 { 152 return GRefPtr<T>(const_cast<T*>(p.get())); 153 } 154 155 template <typename T> inline T* getPtr(const GRefPtr<T>& p) 156 { 157 return p.get(); 158 } 159 160 template <typename T> GRefPtr<T> adoptGRef(T* p) 161 { 162 return GRefPtr<T>(p, GRefPtrAdopt); 163 } 164 165 template <typename T> inline T* refGPtr(T* ptr) 166 { 167 if (ptr) 168 g_object_ref_sink(ptr); 169 return ptr; 170 } 171 172 template <typename T> inline void derefGPtr(T* ptr) 173 { 174 if (ptr) 175 g_object_unref(ptr); 176 } 177 178 } // namespace WTF 179 180 using WTF::GRefPtr; 181 using WTF::refGPtr; 182 using WTF::derefGPtr; 183 using WTF::adoptGRef; 184 using WTF::static_pointer_cast; 185 using WTF::const_pointer_cast; 186 187 #endif // WTF_GRefPtr_h 188
