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Side by Side Diff: Source/WebCore/platform/win/COMPtr.h

Issue 13642009: WebCore: Remove PLATFORM(WIN) files we do not use. (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: Created 7 years, 8 months ago
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1 /*
2 * Copyright (C) 2007, 2010 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #ifndef COMPtr_h
27 #define COMPtr_h
28
29 #ifndef NOMINMAX
30 #define NOMINMAX
31 #endif
32
33 #include <unknwn.h>
34 #include <wtf/Assertions.h>
35 #include <wtf/HashTraits.h>
36
37 #if !OS(WINCE)
38 #include <guiddef.h>
39 #endif
40
41 typedef long HRESULT;
42
43 // FIXME: Should we put this into the WebCore namespace and use "using" on it
44 // as we do with things in WTF?
45
46 enum AdoptCOMTag { AdoptCOM };
47 enum QueryTag { Query };
48 enum CreateTag { Create };
49
50 template<typename T> class COMPtr {
51 public:
52 COMPtr() : m_ptr(0) { }
53 COMPtr(T* ptr) : m_ptr(ptr) { if (m_ptr) m_ptr->AddRef(); }
54 COMPtr(AdoptCOMTag, T* ptr) : m_ptr(ptr) { }
55 COMPtr(const COMPtr& o) : m_ptr(o.m_ptr) { if (T* ptr = m_ptr) ptr->AddRef() ; }
56
57 COMPtr(QueryTag, IUnknown* ptr) : m_ptr(copyQueryInterfaceRef(ptr)) { }
58 template<typename U> COMPtr(QueryTag, const COMPtr<U>& ptr) : m_ptr(copyQuer yInterfaceRef(ptr.get())) { }
59
60 COMPtr(CreateTag, const IID& clsid) : m_ptr(createInstance(clsid)) { }
61
62 // Hash table deleted values, which are only constructed and never copied or destroyed.
63 COMPtr(WTF::HashTableDeletedValueType) : m_ptr(hashTableDeletedValue()) { }
64 bool isHashTableDeletedValue() const { return m_ptr == hashTableDeletedValue (); }
65
66 ~COMPtr() { if (m_ptr) m_ptr->Release(); }
67
68 T* get() const { return m_ptr; }
69
70 void clear();
71 T* leakRef();
72
73 T& operator*() const { return *m_ptr; }
74 T* operator->() const { return m_ptr; }
75
76 T** operator&() { ASSERT(!m_ptr); return &m_ptr; }
77
78 bool operator!() const { return !m_ptr; }
79
80 // This conversion operator allows implicit conversion to bool but not to ot her integer types.
81 typedef T* (COMPtr::*UnspecifiedBoolType)() const;
82 operator UnspecifiedBoolType() const { return m_ptr ? &COMPtr::get : 0; }
83
84 COMPtr& operator=(const COMPtr&);
85 COMPtr& operator=(T*);
86 template<typename U> COMPtr& operator=(const COMPtr<U>&);
87
88 void query(IUnknown* ptr) { adoptRef(copyQueryInterfaceRef(ptr)); }
89 template<typename U> void query(const COMPtr<U>& ptr) { query(ptr.get()); }
90
91 void create(const IID& clsid) { adoptRef(createInstance(clsid)); }
92
93 template<typename U> HRESULT copyRefTo(U**);
94 void adoptRef(T*);
95
96 private:
97 static T* copyQueryInterfaceRef(IUnknown*);
98 static T* createInstance(const IID& clsid);
99 static T* hashTableDeletedValue() { return reinterpret_cast<T*>(-1); }
100
101 T* m_ptr;
102 };
103
104 template<typename T> inline void COMPtr<T>::clear()
105 {
106 if (T* ptr = m_ptr) {
107 m_ptr = 0;
108 ptr->Release();
109 }
110 }
111
112 template<typename T> inline T* COMPtr<T>::leakRef()
113 {
114 T* ptr = m_ptr;
115 m_ptr = 0;
116 return ptr;
117 }
118
119 template<typename T> inline T* COMPtr<T>::createInstance(const IID& clsid)
120 {
121 T* result;
122 if (FAILED(CoCreateInstance(clsid, 0, CLSCTX_ALL, __uuidof(result), reinterp ret_cast<void**>(&result))))
123 return 0;
124 return result;
125 }
126
127 template<typename T> inline T* COMPtr<T>::copyQueryInterfaceRef(IUnknown* ptr)
128 {
129 if (!ptr)
130 return 0;
131 T* result;
132 if (FAILED(ptr->QueryInterface(&result)))
133 return 0;
134 return result;
135 }
136
137 template<typename T> template<typename U> inline HRESULT COMPtr<T>::copyRefTo(U* * ptr)
138 {
139 if (!ptr)
140 return E_POINTER;
141 *ptr = m_ptr;
142 if (m_ptr)
143 m_ptr->AddRef();
144 return S_OK;
145 }
146
147 template<typename T> inline void COMPtr<T>::adoptRef(T *ptr)
148 {
149 if (m_ptr)
150 m_ptr->Release();
151 m_ptr = ptr;
152 }
153
154 template<typename T> inline COMPtr<T>& COMPtr<T>::operator=(const COMPtr<T>& o)
155 {
156 T* optr = o.get();
157 if (optr)
158 optr->AddRef();
159 T* ptr = m_ptr;
160 m_ptr = optr;
161 if (ptr)
162 ptr->Release();
163 return *this;
164 }
165
166 template<typename T> template<typename U> inline COMPtr<T>& COMPtr<T>::operator= (const COMPtr<U>& o)
167 {
168 T* optr = o.get();
169 if (optr)
170 optr->AddRef();
171 T* ptr = m_ptr;
172 m_ptr = optr;
173 if (ptr)
174 ptr->Release();
175 return *this;
176 }
177
178 template<typename T> inline COMPtr<T>& COMPtr<T>::operator=(T* optr)
179 {
180 if (optr)
181 optr->AddRef();
182 T* ptr = m_ptr;
183 m_ptr = optr;
184 if (ptr)
185 ptr->Release();
186 return *this;
187 }
188
189 template<typename T, typename U> inline bool operator==(const COMPtr<T>& a, cons t COMPtr<U>& b)
190 {
191 return a.get() == b.get();
192 }
193
194 template<typename T, typename U> inline bool operator==(const COMPtr<T>& a, U* b )
195 {
196 return a.get() == b;
197 }
198
199 template<typename T, typename U> inline bool operator==(T* a, const COMPtr<U>& b )
200 {
201 return a == b.get();
202 }
203
204 template<typename T, typename U> inline bool operator!=(const COMPtr<T>& a, cons t COMPtr<U>& b)
205 {
206 return a.get() != b.get();
207 }
208
209 template<typename T, typename U> inline bool operator!=(const COMPtr<T>& a, U* b )
210 {
211 return a.get() != b;
212 }
213
214 template<typename T, typename U> inline bool operator!=(T* a, const COMPtr<U>& b )
215 {
216 return a != b.get();
217 }
218
219 namespace WTF {
220
221 template<typename P> struct HashTraits<COMPtr<P> > : GenericHashTraits<COMPt r<P> > {
222 static const bool emptyValueIsZero = true;
223 static void constructDeletedValue(COMPtr<P>& slot) { new (&slot) COMPtr< P>(HashTableDeletedValue); }
224 static bool isDeletedValue(const COMPtr<P>& value) { return value.isHash TableDeletedValue(); }
225 };
226
227 template<typename P> struct PtrHash<COMPtr<P> > : PtrHash<P*> {
228 using PtrHash<P*>::hash;
229 static unsigned hash(const COMPtr<P>& key) { return hash(key.get()); }
230 using PtrHash<P*>::equal;
231 static bool equal(const COMPtr<P>& a, const COMPtr<P>& b) { return a == b; }
232 static bool equal(P* a, const COMPtr<P>& b) { return a == b; }
233 static bool equal(const COMPtr<P>& a, P* b) { return a == b; }
234 };
235
236 template<typename P> struct DefaultHash<COMPtr<P> > { typedef PtrHash<COMPtr <P> > Hash; };
237 }
238
239 #endif
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