1 /* 2 * Copyright (C) 2006, 2010 Apple Inc. All rights reserved. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 * 19 */ 20 21 #ifndef WTF_OwnArrayPtr_h 22 #define WTF_OwnArrayPtr_h 23 24 #include "Assertions.h" 25 #include "Noncopyable.h" 26 #include "NullPtr.h" 27 #include "PassOwnArrayPtr.h" 28 #include <algorithm> 29 30 namespace WTF { 31 32 template<typename T> class PassOwnArrayPtr; 33 template<typename T> PassOwnArrayPtr<T> adoptArrayPtr(T*); 34 35 template <typename T> class OwnArrayPtr { 36 public: 37 typedef T* PtrType; 38 39 OwnArrayPtr() : m_ptr(0) { } 40 41 // See comment in PassOwnArrayPtr.h for why this takes a const reference. 42 template<typename U> OwnArrayPtr(const PassOwnArrayPtr<U>& o); 43 44 // This copy constructor is used implicitly by gcc when it generates 45 // transients for assigning a PassOwnArrayPtr<T> object to a stack-allocated 46 // OwnArrayPtr<T> object. It should never be called explicitly and gcc 47 // should optimize away the constructor when generating code. 48 OwnArrayPtr(const OwnArrayPtr<T>&); 49 50 ~OwnArrayPtr() { deleteOwnedArrayPtr(m_ptr); } 51 52 PtrType get() const { return m_ptr; } 53 54 void clear(); 55 PassOwnArrayPtr<T> release(); 56 PtrType leakPtr() WARN_UNUSED_RETURN; 57 58 T& operator*() const { ASSERT(m_ptr); return *m_ptr; } 59 PtrType operator->() const { ASSERT(m_ptr); return m_ptr; } 60 61 T& operator[](std::ptrdiff_t i) const { ASSERT(m_ptr); ASSERT(i >= 0); return m_ptr[i]; } 62 63 bool operator!() const { return !m_ptr; } 64 65 // This conversion operator allows implicit conversion to bool but not to other integer types. 66 #if COMPILER(WINSCW) 67 operator bool() const { return m_ptr; } 68 #else 69 typedef T* OwnArrayPtr::*UnspecifiedBoolType; 70 operator UnspecifiedBoolType() const { return m_ptr ? &OwnArrayPtr::m_ptr : 0; } 71 #endif 72 73 OwnArrayPtr& operator=(const PassOwnArrayPtr<T>&); 74 OwnArrayPtr& operator=(std::nullptr_t) { clear(); return *this; } 75 template<typename U> OwnArrayPtr& operator=(const PassOwnArrayPtr<U>&); 76 77 void swap(OwnArrayPtr& o) { std::swap(m_ptr, o.m_ptr); } 78 79 #ifdef LOOSE_OWN_ARRAY_PTR 80 explicit OwnArrayPtr(PtrType ptr) : m_ptr(ptr) { } 81 void set(PtrType); 82 #endif 83 84 private: 85 PtrType m_ptr; 86 }; 87 88 template<typename T> template<typename U> inline OwnArrayPtr<T>::OwnArrayPtr(const PassOwnArrayPtr<U>& o) 89 : m_ptr(o.leakPtr()) 90 { 91 } 92 93 template<typename T> inline void OwnArrayPtr<T>::clear() 94 { 95 PtrType ptr = m_ptr; 96 m_ptr = 0; 97 deleteOwnedArrayPtr(ptr); 98 } 99 100 template<typename T> inline PassOwnArrayPtr<T> OwnArrayPtr<T>::release() 101 { 102 PtrType ptr = m_ptr; 103 m_ptr = 0; 104 return adoptArrayPtr(ptr); 105 } 106 107 template<typename T> inline typename OwnArrayPtr<T>::PtrType OwnArrayPtr<T>::leakPtr() 108 { 109 PtrType ptr = m_ptr; 110 m_ptr = 0; 111 return ptr; 112 } 113 114 #ifdef LOOSE_OWN_ARRAY_PTR 115 template<typename T> inline void OwnArrayPtr<T>::set(PtrType ptr) 116 { 117 ASSERT(!ptr || m_ptr != ptr); 118 PtrType oldPtr = m_ptr; 119 m_ptr = ptr; 120 deleteOwnedArrayPtr(oldPtr); 121 } 122 #endif 123 124 template<typename T> inline OwnArrayPtr<T>& OwnArrayPtr<T>::operator=(const PassOwnArrayPtr<T>& o) 125 { 126 PtrType ptr = m_ptr; 127 m_ptr = o.leakPtr(); 128 ASSERT(!ptr || m_ptr != ptr); 129 deleteOwnedArrayPtr(ptr); 130 return *this; 131 } 132 133 template<typename T> template<typename U> inline OwnArrayPtr<T>& OwnArrayPtr<T>::operator=(const PassOwnArrayPtr<U>& o) 134 { 135 PtrType ptr = m_ptr; 136 m_ptr = o.leakPtr(); 137 ASSERT(!ptr || m_ptr != ptr); 138 deleteOwnedArrayPtr(ptr); 139 return *this; 140 } 141 142 template <typename T> inline void swap(OwnArrayPtr<T>& a, OwnArrayPtr<T>& b) 143 { 144 a.swap(b); 145 } 146 147 template<typename T, typename U> inline bool operator==(const OwnArrayPtr<T>& a, U* b) 148 { 149 return a.get() == b; 150 } 151 152 template<typename T, typename U> inline bool operator==(T* a, const OwnArrayPtr<U>& b) 153 { 154 return a == b.get(); 155 } 156 157 template<typename T, typename U> inline bool operator!=(const OwnArrayPtr<T>& a, U* b) 158 { 159 return a.get() != b; 160 } 161 162 template<typename T, typename U> inline bool operator!=(T* a, const OwnArrayPtr<U>& b) 163 { 164 return a != b.get(); 165 } 166 167 template <typename T> inline T* getPtr(const OwnArrayPtr<T>& p) 168 { 169 return p.get(); 170 } 171 172 } // namespace WTF 173 174 using WTF::OwnArrayPtr; 175 176 #endif // WTF_OwnArrayPtr_h 177
