external/webkit r30707

1 files changed, 193 insertions, 0 deletions

diff --git a/JavaScriptCore/wtf/PassRefPtr.h b/JavaScriptCore/wtf/PassRefPtr.h
new file mode 100644
index 0000000..25b9906
--- /dev/null
+++ b/JavaScriptCore/wtf/PassRefPtr.h
@@ -0,0 +1,193 @@
+// -*- mode: c++; c-basic-offset: 4 -*-
+/*
+ *  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.
+        typedef T* PassRefPtr::*UnspecifiedBoolType;
+        operator UnspecifiedBoolType() const { return m_ptr ? &PassRefPtr::m_ptr : 0; }
+        
+        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