--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/JavaScriptCore/wtf/RefPtr.h Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,229 @@
+/*
+ * 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 "AlwaysInline.h"
+#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) { T* ptr = m_ptr; refIfNotNull(ptr); }
+ // see comment in PassRefPtr.h for why this takes const reference
+ 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); }
+
+ template <typename U> RefPtr(const RefPtr<U>& o) : m_ptr(o.get()) { T* ptr = m_ptr; refIfNotNull(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>&);
+ 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.releaseRef())
+ {
+ }
+
+ template <typename T> template <typename U> inline RefPtr<T>::RefPtr(const NonNullPassRefPtr<U>& o)
+ : m_ptr(o.releaseRef())
+ {
+ }
+
+ 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.releaseRef();
+ derefIfNotNull(ptr);
+ return *this;
+ }
+
+ template <typename T> inline RefPtr<T>& RefPtr<T>::operator=(const NonNullPassRefPtr<T>& o)
+ {
+ T* ptr = m_ptr;
+ m_ptr = o.releaseRef();
+ 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.releaseRef();
+ 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.releaseRef();
+ 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