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 #if ENABLE(GLIB_SUPPORT)
26
27 #include <algorithm>
28 #include <wtf/Assertions.h>
29 #include <wtf/Noncopyable.h>
30
31 extern "C" void g_free(void*);
32
33 namespace WTF {
34
35 template <typename T> inline void freeOwnedGPtr(T* ptr);
36 template<> void freeOwnedGPtr<GError>(GError*);
37 template<> void freeOwnedGPtr<GList>(GList*);
38 template<> void freeOwnedGPtr<GCond>(GCond*);
39 template<> void freeOwnedGPtr<GMutex>(GMutex*);
40 template<> void freeOwnedGPtr<GPatternSpec>(GPatternSpec*);
41 template<> void freeOwnedGPtr<GDir>(GDir*);
42
43 template <typename T> class GOwnPtr {
44 WTF_MAKE_NONCOPYABLE(GOwnPtr);
45 public:
m_ptr(ptr)46 explicit GOwnPtr(T* ptr = 0) : m_ptr(ptr) { }
~GOwnPtr()47 ~GOwnPtr() { freeOwnedGPtr(m_ptr); }
48
get()49 T* get() const { return m_ptr; }
release()50 T* release()
51 {
52 T* ptr = m_ptr;
53 m_ptr = 0;
54 return ptr;
55 }
56
outPtr()57 T*& outPtr()
58 {
59 ASSERT(!m_ptr);
60 return m_ptr;
61 }
62
set(T * ptr)63 void set(T* ptr)
64 {
65 ASSERT(!ptr || m_ptr != ptr);
66 freeOwnedGPtr(m_ptr);
67 m_ptr = ptr;
68 }
69
clear()70 void clear()
71 {
72 T* ptr = m_ptr;
73 m_ptr = 0;
74 freeOwnedGPtr(ptr);
75 }
76
77 T& operator*() const
78 {
79 ASSERT(m_ptr);
80 return *m_ptr;
81 }
82
83 T* operator->() const
84 {
85 ASSERT(m_ptr);
86 return m_ptr;
87 }
88
89 bool operator!() const { return !m_ptr; }
90
91 // This conversion operator allows implicit conversion to bool but not to other integer types.
92 typedef T* GOwnPtr::*UnspecifiedBoolType;
UnspecifiedBoolType()93 operator UnspecifiedBoolType() const { return m_ptr ? &GOwnPtr::m_ptr : 0; }
94
swap(GOwnPtr & o)95 void swap(GOwnPtr& o) { std::swap(m_ptr, o.m_ptr); }
96
97 private:
98 T* m_ptr;
99 };
100
swap(GOwnPtr<T> & a,GOwnPtr<T> & b)101 template <typename T> inline void swap(GOwnPtr<T>& a, GOwnPtr<T>& b)
102 {
103 a.swap(b);
104 }
105
106 template <typename T, typename U> inline bool operator==(const GOwnPtr<T>& a, U* b)
107 {
108 return a.get() == b;
109 }
110
111 template <typename T, typename U> inline bool operator==(T* a, const GOwnPtr<U>& b)
112 {
113 return a == b.get();
114 }
115
116 template <typename T, typename U> inline bool operator!=(const GOwnPtr<T>& a, U* b)
117 {
118 return a.get() != b;
119 }
120
121 template <typename T, typename U> inline bool operator!=(T* a, const GOwnPtr<U>& b)
122 {
123 return a != b.get();
124 }
125
getPtr(const GOwnPtr<T> & p)126 template <typename T> inline typename GOwnPtr<T>::PtrType getPtr(const GOwnPtr<T>& p)
127 {
128 return p.get();
129 }
130
freeOwnedGPtr(T * ptr)131 template <typename T> inline void freeOwnedGPtr(T* ptr)
132 {
133 g_free(ptr);
134 }
135
136 } // namespace WTF
137
138 using WTF::GOwnPtr;
139
140 #endif // ENABLE(GLIB_SUPPORT)
141
142 #endif // GOwnPtr_h
143
144