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Diffstat (limited to 'src/3rdparty/webkit/JavaScriptCore/wtf/PassRefPtr.h')
| -rw-r--r-- | src/3rdparty/webkit/JavaScriptCore/wtf/PassRefPtr.h | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/src/3rdparty/webkit/JavaScriptCore/wtf/PassRefPtr.h b/src/3rdparty/webkit/JavaScriptCore/wtf/PassRefPtr.h new file mode 100644 index 0000000..c1dc309 --- /dev/null +++ b/src/3rdparty/webkit/JavaScriptCore/wtf/PassRefPtr.h @@ -0,0 +1,195 @@ +/* + * Copyright (C) 2005, 2006, 2007 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_PassRefPtr_h +#define WTF_PassRefPtr_h + +#include "AlwaysInline.h" + +namespace WTF { + + template<typename T> class RefPtr; + template<typename T> class PassRefPtr; + template <typename T> PassRefPtr<T> adoptRef(T*); + + template<typename T> class PassRefPtr { + public: + PassRefPtr() : m_ptr(0) {} + PassRefPtr(T* ptr) : m_ptr(ptr) { if (ptr) ptr->ref(); } + // It somewhat breaks the type system to allow transfer of ownership out of + // a const PassRefPtr. However, it makes it much easier to work with PassRefPtr + // temporaries, and we don't really have a need to use real const PassRefPtrs + // anyway. + PassRefPtr(const PassRefPtr& o) : m_ptr(o.releaseRef()) {} + template <typename U> PassRefPtr(const PassRefPtr<U>& o) : m_ptr(o.releaseRef()) { } + + ALWAYS_INLINE ~PassRefPtr() { if (T* ptr = m_ptr) ptr->deref(); } + + template <class U> + PassRefPtr(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; } + T* releaseRef() const { T* tmp = m_ptr; m_ptr = 0; return tmp; } + + T& operator*() const { return *m_ptr; } + 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. +#if COMPILER(WINSCW) + operator bool() const { return m_ptr; } +#else + typedef T* PassRefPtr::*UnspecifiedBoolType; + operator UnspecifiedBoolType() const { return m_ptr ? &PassRefPtr::m_ptr : 0; } +#endif + PassRefPtr& operator=(T*); + PassRefPtr& operator=(const PassRefPtr&); + template <typename U> PassRefPtr& operator=(const PassRefPtr<U>&); + template <typename U> PassRefPtr& operator=(const RefPtr<U>&); + + friend PassRefPtr adoptRef<T>(T*); + private: + // adopting constructor + PassRefPtr(T* ptr, bool) : m_ptr(ptr) {} + mutable T* m_ptr; + }; + + template <typename T> template <typename U> inline PassRefPtr<T>& PassRefPtr<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 PassRefPtr<T>& PassRefPtr<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 PassRefPtr<T>& PassRefPtr<T>::operator=(const PassRefPtr<T>& ref) + { + T* ptr = m_ptr; + m_ptr = ref.releaseRef(); + if (ptr) + ptr->deref(); + return *this; + } + + template <typename T> template <typename U> inline PassRefPtr<T>& PassRefPtr<T>::operator=(const PassRefPtr<U>& ref) + { + T* ptr = m_ptr; + m_ptr = ref.releaseRef(); + if (ptr) + ptr->deref(); + return *this; + } + + template <typename T, typename U> inline bool operator==(const PassRefPtr<T>& a, const PassRefPtr<U>& b) + { + return a.get() == b.get(); + } + + template <typename T, typename U> inline bool operator==(const PassRefPtr<T>& a, const RefPtr<U>& b) + { + return a.get() == b.get(); + } + + template <typename T, typename U> inline bool operator==(const RefPtr<T>& a, const PassRefPtr<U>& b) + { + return a.get() == b.get(); + } + + template <typename T, typename U> inline bool operator==(const PassRefPtr<T>& a, U* b) + { + return a.get() == b; + } + + template <typename T, typename U> inline bool operator==(T* a, const PassRefPtr<U>& b) + { + return a == b.get(); + } + + template <typename T, typename U> inline bool operator!=(const PassRefPtr<T>& a, const PassRefPtr<U>& b) + { + return a.get() != b.get(); + } + + template <typename T, typename U> inline bool operator!=(const PassRefPtr<T>& a, const RefPtr<U>& b) + { + return a.get() != b.get(); + } + + template <typename T, typename U> inline bool operator!=(const RefPtr<T>& a, const PassRefPtr<U>& b) + { + return a.get() != b.get(); + } + + template <typename T, typename U> inline bool operator!=(const PassRefPtr<T>& a, U* b) + { + return a.get() != b; + } + + template <typename T, typename U> inline bool operator!=(T* a, const PassRefPtr<U>& b) + { + return a != b.get(); + } + + template <typename T> inline PassRefPtr<T> adoptRef(T* p) + { + return PassRefPtr<T>(p, true); + } + + template <typename T, typename U> inline PassRefPtr<T> static_pointer_cast(const PassRefPtr<U>& p) + { + return adoptRef(static_cast<T*>(p.releaseRef())); + } + + template <typename T, typename U> inline PassRefPtr<T> const_pointer_cast(const PassRefPtr<U>& p) + { + return adoptRef(const_cast<T*>(p.releaseRef())); + } + + template <typename T> inline T* getPtr(const PassRefPtr<T>& p) + { + return p.get(); + } + +} // namespace WTF + +using WTF::PassRefPtr; +using WTF::adoptRef; +using WTF::static_pointer_cast; +using WTF::const_pointer_cast; + +#endif // WTF_PassRefPtr_h |