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author | Steve Block <steveblock@google.com> | 2011-05-13 06:44:40 -0700 |
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committer | Android (Google) Code Review <android-gerrit@google.com> | 2011-05-13 06:44:40 -0700 |
commit | 08014c20784f3db5df3a89b73cce46037b77eb59 (patch) | |
tree | 47749210d31e19e6e2f64036fa8fae2ad693476f /Source/JavaScriptCore/wtf/RefPtr.h | |
parent | 860220379e56aeb66424861ad602b07ee22b4055 (diff) | |
parent | 4c3661f7918f8b3f139f824efb7855bedccb4c94 (diff) | |
download | external_webkit-08014c20784f3db5df3a89b73cce46037b77eb59.zip external_webkit-08014c20784f3db5df3a89b73cce46037b77eb59.tar.gz external_webkit-08014c20784f3db5df3a89b73cce46037b77eb59.tar.bz2 |
Merge changes Ide388898,Ic49f367c,I1158a808,Iacb6ca5d,I2100dd3a,I5c1abe54,Ib0ef9902,I31dbc523,I570314b3
* changes:
Merge WebKit at r75315: Update WebKit version
Merge WebKit at r75315: Add FrameLoaderClient PageCache stubs
Merge WebKit at r75315: Stub out AXObjectCache::remove()
Merge WebKit at r75315: Fix ImageBuffer
Merge WebKit at r75315: Fix PluginData::initPlugins()
Merge WebKit at r75315: Fix conflicts
Merge WebKit at r75315: Fix Makefiles
Merge WebKit at r75315: Move Android-specific WebCore files to Source
Merge WebKit at r75315: Initial merge by git.
Diffstat (limited to 'Source/JavaScriptCore/wtf/RefPtr.h')
-rw-r--r-- | Source/JavaScriptCore/wtf/RefPtr.h | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/wtf/RefPtr.h b/Source/JavaScriptCore/wtf/RefPtr.h new file mode 100644 index 0000000..d57f88a --- /dev/null +++ b/Source/JavaScriptCore/wtf/RefPtr.h @@ -0,0 +1,231 @@ +/* + * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public License + * along with this library; see the file COPYING.LIB. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + * + */ + +// RefPtr and PassRefPtr are documented at http://webkit.org/coding/RefPtr.html + +#ifndef WTF_RefPtr_h +#define WTF_RefPtr_h + +#include <algorithm> +#include "FastAllocBase.h" +#include "PassRefPtr.h" + +namespace WTF { + + enum PlacementNewAdoptType { PlacementNewAdopt }; + + template<typename T> class PassRefPtr; + template<typename T> class NonNullPassRefPtr; + + enum HashTableDeletedValueType { HashTableDeletedValue }; + + template<typename T> class RefPtr : public FastAllocBase { + public: + ALWAYS_INLINE RefPtr() : m_ptr(0) { } + ALWAYS_INLINE RefPtr(T* ptr) : m_ptr(ptr) { refIfNotNull(ptr); } + ALWAYS_INLINE RefPtr(const RefPtr& o) : m_ptr(o.m_ptr) { refIfNotNull(m_ptr); } + template<typename U> RefPtr(const RefPtr<U>& o) : m_ptr(o.get()) { refIfNotNull(m_ptr); } + + // See comments in PassRefPtr.h for an explanation of why these takes const references. + template<typename U> RefPtr(const PassRefPtr<U>&); + template<typename U> RefPtr(const NonNullPassRefPtr<U>&); + + // Special constructor for cases where we overwrite an object in place. + ALWAYS_INLINE RefPtr(PlacementNewAdoptType) { } + + // Hash table deleted values, which are only constructed and never copied or destroyed. + RefPtr(HashTableDeletedValueType) : m_ptr(hashTableDeletedValue()) { } + bool isHashTableDeletedValue() const { return m_ptr == hashTableDeletedValue(); } + + ALWAYS_INLINE ~RefPtr() { derefIfNotNull(m_ptr); } + + T* get() const { return m_ptr; } + + void clear(); + PassRefPtr<T> release() { PassRefPtr<T> tmp = adoptRef(m_ptr); m_ptr = 0; return tmp; } + + T& operator*() const { return *m_ptr; } + ALWAYS_INLINE T* operator->() const { return m_ptr; } + + bool operator!() const { return !m_ptr; } + + // This conversion operator allows implicit conversion to bool but not to other integer types. + typedef T* (RefPtr::*UnspecifiedBoolType); + operator UnspecifiedBoolType() const { return m_ptr ? &RefPtr::m_ptr : 0; } + + RefPtr& operator=(const RefPtr&); + RefPtr& operator=(T*); + RefPtr& operator=(const PassRefPtr<T>&); + RefPtr& operator=(const NonNullPassRefPtr<T>&); +#if !HAVE(NULLPTR) + RefPtr& operator=(std::nullptr_t) { clear(); return *this; } +#endif + template<typename U> RefPtr& operator=(const RefPtr<U>&); + template<typename U> RefPtr& operator=(const PassRefPtr<U>&); + template<typename U> RefPtr& operator=(const NonNullPassRefPtr<U>&); + + void swap(RefPtr&); + + static T* hashTableDeletedValue() { return reinterpret_cast<T*>(-1); } + + private: + T* m_ptr; + }; + + template<typename T> template<typename U> inline RefPtr<T>::RefPtr(const PassRefPtr<U>& o) + : m_ptr(o.leakRef()) + { + } + + template<typename T> template<typename U> inline RefPtr<T>::RefPtr(const NonNullPassRefPtr<U>& o) + : m_ptr(o.leakRef()) + { + } + + template<typename T> inline void RefPtr<T>::clear() + { + T* ptr = m_ptr; + m_ptr = 0; + derefIfNotNull(ptr); + } + + template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(const RefPtr<T>& o) + { + T* optr = o.get(); + refIfNotNull(optr); + T* ptr = m_ptr; + m_ptr = optr; + derefIfNotNull(ptr); + return *this; + } + + template<typename T> template<typename U> inline RefPtr<T>& RefPtr<T>::operator=(const RefPtr<U>& o) + { + T* optr = o.get(); + refIfNotNull(optr); + T* ptr = m_ptr; + m_ptr = optr; + derefIfNotNull(ptr); + return *this; + } + + template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(T* optr) + { + refIfNotNull(optr); + T* ptr = m_ptr; + m_ptr = optr; + derefIfNotNull(ptr); + return *this; + } + + template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(const PassRefPtr<T>& o) + { + T* ptr = m_ptr; + m_ptr = o.leakRef(); + derefIfNotNull(ptr); + return *this; + } + + template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(const NonNullPassRefPtr<T>& o) + { + T* ptr = m_ptr; + m_ptr = o.leakRef(); + derefIfNotNull(ptr); + return *this; + } + + template<typename T> template<typename U> inline RefPtr<T>& RefPtr<T>::operator=(const PassRefPtr<U>& o) + { + T* ptr = m_ptr; + m_ptr = o.leakRef(); + derefIfNotNull(ptr); + return *this; + } + + template<typename T> template<typename U> inline RefPtr<T>& RefPtr<T>::operator=(const NonNullPassRefPtr<U>& o) + { + T* ptr = m_ptr; + m_ptr = o.leakRef(); + derefIfNotNull(ptr); + return *this; + } + + template<class T> inline void RefPtr<T>::swap(RefPtr<T>& o) + { + std::swap(m_ptr, o.m_ptr); + } + + template<class T> inline void swap(RefPtr<T>& a, RefPtr<T>& b) + { + a.swap(b); + } + + template<typename T, typename U> inline bool operator==(const RefPtr<T>& a, const RefPtr<U>& b) + { + return a.get() == b.get(); + } + + template<typename T, typename U> inline bool operator==(const RefPtr<T>& a, U* b) + { + return a.get() == b; + } + + template<typename T, typename U> inline bool operator==(T* a, const RefPtr<U>& b) + { + return a == b.get(); + } + + template<typename T, typename U> inline bool operator!=(const RefPtr<T>& a, const RefPtr<U>& b) + { + return a.get() != b.get(); + } + + template<typename T, typename U> inline bool operator!=(const RefPtr<T>& a, U* b) + { + return a.get() != b; + } + + template<typename T, typename U> inline bool operator!=(T* a, const RefPtr<U>& b) + { + return a != b.get(); + } + + template<typename T, typename U> inline RefPtr<T> static_pointer_cast(const RefPtr<U>& p) + { + return RefPtr<T>(static_cast<T*>(p.get())); + } + + template<typename T, typename U> inline RefPtr<T> const_pointer_cast(const RefPtr<U>& p) + { + return RefPtr<T>(const_cast<T*>(p.get())); + } + + template<typename T> inline T* getPtr(const RefPtr<T>& p) + { + return p.get(); + } + +} // namespace WTF + +using WTF::RefPtr; +using WTF::static_pointer_cast; +using WTF::const_pointer_cast; + +#endif // WTF_RefPtr_h |