Move Source/WTF/wtf to Source/wtf

Source/WTF/wtf/PassRefPtr.h

-/*
- *  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.
- *
- */
-
-#ifndef WTF_PassRefPtr_h
-#define WTF_PassRefPtr_h
-
-#include <wtf/Assertions.h>
-#include <wtf/NullPtr.h>
-
-namespace WTF {
-
-    template<typename T> class RefPtr;
-    template<typename T> class PassRefPtr;
-    template<typename T> PassRefPtr<T> adoptRef(T*);
-
-    inline void adopted(const void*) { }
-
-    template<typename T> ALWAYS_INLINE void refIfNotNull(T* ptr)
-    {
-        if (LIKELY(ptr != 0))
-            ptr->ref();
-    }
-
-    template<typename T> ALWAYS_INLINE void derefIfNotNull(T* ptr)
-    {
-        if (LIKELY(ptr != 0))
-            ptr->deref();
-    }
-
-    template<typename T> class PassRefPtr {
-    public:
-        PassRefPtr() : m_ptr(0) { }
-        PassRefPtr(T* ptr) : m_ptr(ptr) { refIfNotNull(ptr); }
-        // 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 have a need to use real const PassRefPtrs anyway.
-        PassRefPtr(const PassRefPtr& o) : m_ptr(o.leakRef()) { }
-        template<typename U> PassRefPtr(const PassRefPtr<U>& o) : m_ptr(o.leakRef()) { }
-
-        ALWAYS_INLINE ~PassRefPtr() { derefIfNotNull(m_ptr); }
-
-        template<typename U> PassRefPtr(const RefPtr<U>&);
-        
-        T* get() const { return m_ptr; }
-
-        T* leakRef() const WARN_UNUSED_RETURN;
-
-        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=(const PassRefPtr&) { COMPILE_ASSERT(!sizeof(T*), PassRefPtr_should_never_be_assigned_to); return *this; }
-
-        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(const RefPtr<U>& o)
-        : m_ptr(o.get())
-    {
-        T* ptr = m_ptr;
-        refIfNotNull(ptr);
-    }
-
-    template<typename T> inline T* PassRefPtr<T>::leakRef() const
-    {
-        T* ptr = m_ptr;
-        m_ptr = 0;
-        return ptr;
-    }
-
-    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)
-    {
-        adopted(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.leakRef())); 
-    }
-
-    template<typename T, typename U> inline PassRefPtr<T> const_pointer_cast(const PassRefPtr<U>& p) 
-    { 
-        return adoptRef(const_cast<T*>(p.leakRef())); 
-    }
-
-    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