1 /* 2 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved. 3 * Copyright (C) 2008 Collabora Ltd. 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public License 16 * along with this library; see the file COPYING.LIB. If not, write to 17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 18 * Boston, MA 02110-1301, USA. 19 * 20 */ 21 22 #ifndef GOwnPtr_h 23 #define GOwnPtr_h 24 25 #include <algorithm> 26 #include <glib.h> 27 #include <wtf/Assertions.h> 28 #include <wtf/Noncopyable.h> 29 30 namespace WTF { freeOwnedGPtr(T * ptr)31 template <typename T> inline void freeOwnedGPtr(T* ptr) { g_free(reinterpret_cast<void*>(ptr)); } 32 template<> void freeOwnedGPtr<GError>(GError*); 33 template<> void freeOwnedGPtr<GList>(GList*); 34 template<> void freeOwnedGPtr<GCond>(GCond*); 35 template<> void freeOwnedGPtr<GMutex>(GMutex*); 36 template<> void freeOwnedGPtr<GPatternSpec>(GPatternSpec*); 37 template<> void freeOwnedGPtr<GDir>(GDir*); 38 template<> void freeOwnedGPtr<GHashTable>(GHashTable*); 39 40 template <typename T> class GOwnPtr : public Noncopyable { 41 public: m_ptr(ptr)42 explicit GOwnPtr(T* ptr = 0) : m_ptr(ptr) { } ~GOwnPtr()43 ~GOwnPtr() { freeOwnedGPtr(m_ptr); } 44 get()45 T* get() const { return m_ptr; } release()46 T* release() { T* ptr = m_ptr; m_ptr = 0; return ptr; } outPtr()47 T*& outPtr() { ASSERT(!m_ptr); return m_ptr; } 48 set(T * ptr)49 void set(T* ptr) { ASSERT(!ptr || m_ptr != ptr); freeOwnedGPtr(m_ptr); m_ptr = ptr; } clear()50 void clear() { freeOwnedGPtr(m_ptr); m_ptr = 0; } 51 52 T& operator*() const { ASSERT(m_ptr); return *m_ptr; } 53 T* operator->() const { ASSERT(m_ptr); return m_ptr; } 54 55 bool operator!() const { return !m_ptr; } 56 57 // This conversion operator allows implicit conversion to bool but not to other integer types. 58 typedef T* GOwnPtr::*UnspecifiedBoolType; UnspecifiedBoolType()59 operator UnspecifiedBoolType() const { return m_ptr ? &GOwnPtr::m_ptr : 0; } 60 swap(GOwnPtr & o)61 void swap(GOwnPtr& o) { std::swap(m_ptr, o.m_ptr); } 62 63 private: 64 T* m_ptr; 65 }; 66 swap(GOwnPtr<T> & a,GOwnPtr<T> & b)67 template <typename T> inline void swap(GOwnPtr<T>& a, GOwnPtr<T>& b) { a.swap(b); } 68 69 template <typename T, typename U> inline bool operator==(const GOwnPtr<T>& a, U* b) 70 { 71 return a.get() == b; 72 } 73 74 template <typename T, typename U> inline bool operator==(T* a, const GOwnPtr<U>& b) 75 { 76 return a == b.get(); 77 } 78 79 template <typename T, typename U> inline bool operator!=(const GOwnPtr<T>& a, U* b) 80 { 81 return a.get() != b; 82 } 83 84 template <typename T, typename U> inline bool operator!=(T* a, const GOwnPtr<U>& b) 85 { 86 return a != b.get(); 87 } 88 getPtr(const GOwnPtr<T> & p)89 template <typename T> inline typename GOwnPtr<T>::PtrType getPtr(const GOwnPtr<T>& p) 90 { 91 return p.get(); 92 } 93 94 } // namespace WTF 95 96 using WTF::GOwnPtr; 97 98 #endif // GOwnPtr_h 99