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Diffstat (limited to 'khtml/html/RefPtr.h')
| -rw-r--r-- | khtml/html/RefPtr.h | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/khtml/html/RefPtr.h b/khtml/html/RefPtr.h new file mode 100644 index 000000000..8754bbf94 --- /dev/null +++ b/khtml/html/RefPtr.h @@ -0,0 +1,202 @@ +// -*- mode: c++; c-basic-offset: 4 -*- +/* + * Copyright (C) 2005, 2006, 2007, 2008 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. + * + */ + +#ifndef WTF_RefPtr_h +#define WTF_RefPtr_h + +#include <algorithm> +#include "AlwaysInline.h" + +namespace WTF { + + enum PlacementNewAdoptType { PlacementNewAdopt }; + + template <typename T> class PassRefPtr; + + enum HashTableDeletedValueType { HashTableDeletedValue }; + + template <typename T> class RefPtr { + public: + RefPtr() : m_ptr(0) { } + RefPtr(T* ptr) : m_ptr(ptr) { if (ptr) ptr->ref(); } + RefPtr(const RefPtr& o) : m_ptr(o.m_ptr) { if (T* ptr = m_ptr) ptr->ref(); } + // see comment in PassRefPtr.h for why this takes const reference + template <typename U> RefPtr(const PassRefPtr<U>&); + + // Special constructor for cases where we overwrite an object in place. + 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(); } + + ~RefPtr() { if (T* ptr = m_ptr) ptr->deref(); } + + template <typename U> RefPtr(const RefPtr<U>& o) : m_ptr(o.get()) { if (T* ptr = m_ptr) ptr->ref(); } + + T* get() const { return m_ptr; } + + void clear() { if (T* ptr = m_ptr) ptr->deref(); m_ptr = 0; } + 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>&); + template <typename U> RefPtr& operator=(const RefPtr<U>&); + template <typename U> RefPtr& operator=(const PassRefPtr<U>&); + + void swap(RefPtr&); + + private: + static T* hashTableDeletedValue() { return reinterpret_cast<T*>(-1); } + + T* m_ptr; + }; + + template <typename T> template <typename U> inline RefPtr<T>::RefPtr(const PassRefPtr<U>& o) + : m_ptr(o.releaseRef()) + { + } + + template <typename T> inline RefPtr<T>& RefPtr<T>::operator=(const RefPtr<T>& o) + { + T* optr = o.get(); + if (optr) + optr->ref(); + T* ptr = m_ptr; + m_ptr = optr; + if (ptr) + ptr->deref(); + return *this; + } + + template <typename T> template <typename U> inline RefPtr<T>& RefPtr<T>::operator=(const RefPtr<U>& o) + { + T* optr = o.get(); + if (optr) + optr->ref(); + T* ptr = m_ptr; + m_ptr = optr; + if (ptr) + ptr->deref(); + return *this; + } + + template <typename T> inline RefPtr<T>& RefPtr<T>::operator=(T* optr) + { + if (optr) + optr->ref(); + T* ptr = m_ptr; + m_ptr = optr; + if (ptr) + ptr->deref(); + return *this; + } + + template <typename T> inline RefPtr<T>& RefPtr<T>::operator=(const PassRefPtr<T>& o) + { + T* ptr = m_ptr; + m_ptr = o.releaseRef(); + if (ptr) + ptr->deref(); + 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(); + if (ptr) + ptr->deref(); + 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 |