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/*
* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2013 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 SKY_ENGINE_WTF_REFPTR_H_
#define SKY_ENGINE_WTF_REFPTR_H_
#include <algorithm>
#include "sky/engine/wtf/HashTableDeletedValueType.h"
#include "sky/engine/wtf/PassRefPtr.h"
#include "sky/engine/wtf/RawPtr.h"
namespace WTF {
template<typename T> class PassRefPtr;
template<typename T> class RefPtr {
WTF_DISALLOW_CONSTRUCTION_FROM_ZERO(RefPtr);
WTF_DISALLOW_ZERO_ASSIGNMENT(RefPtr);
public:
ALWAYS_INLINE RefPtr() : m_ptr(0) { }
ALWAYS_INLINE RefPtr(std::nullptr_t) : m_ptr(0) { }
ALWAYS_INLINE RefPtr(T* ptr) : m_ptr(ptr) { refIfNotNull(ptr); }
template<typename U> RefPtr(const RawPtr<U>& ptr, EnsurePtrConvertibleArgDecl(U, T)) : m_ptr(ptr.get()) { refIfNotNull(m_ptr); }
ALWAYS_INLINE explicit RefPtr(T& ref) : m_ptr(&ref) { m_ptr->ref(); }
ALWAYS_INLINE RefPtr(const RefPtr& o) : m_ptr(o.m_ptr) { refIfNotNull(m_ptr); }
template<typename U> RefPtr(const RefPtr<U>& o, EnsurePtrConvertibleArgDecl(U, T)) : m_ptr(o.get()) { refIfNotNull(m_ptr); }
RefPtr(RefPtr&& o) : m_ptr(o.m_ptr) { o.m_ptr = 0; }
RefPtr& operator=(RefPtr&&);
// See comments in PassRefPtr.h for an explanation of why this takes a const reference.
template<typename U> RefPtr(const PassRefPtr<U>&, EnsurePtrConvertibleArgDecl(U, T));
// 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); }
ALWAYS_INLINE 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=(std::nullptr_t) { clear(); return *this; }
template<typename U> RefPtr<T>& operator=(const RefPtr<U>&);
template<typename U> RefPtr<T>& operator=(const PassRefPtr<U>&);
template<typename U> RefPtr<T>& operator=(const RawPtr<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, EnsurePtrConvertibleArgDefn(U, T))
: m_ptr(o.leakRef())
{
}
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& o)
{
RefPtr ptr = o;
swap(ptr);
return *this;
}
template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(RefPtr&& o)
{
// FIXME: Instead of explicitly casting to RefPtr&& here, we should use std::move, but that requires us to
// have a standard library that supports move semantics.
RefPtr ptr = static_cast<RefPtr&&>(o);
swap(ptr);
return *this;
}
template<typename T> template<typename U> inline RefPtr<T>& RefPtr<T>::operator=(const RefPtr<U>& o)
{
RefPtr ptr = o;
swap(ptr);
return *this;
}
template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(T* optr)
{
RefPtr ptr = optr;
swap(ptr);
return *this;
}
template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(const PassRefPtr<T>& o)
{
RefPtr ptr = o;
swap(ptr);
return *this;
}
template<typename T> template<typename U> inline RefPtr<T>& RefPtr<T>::operator=(const PassRefPtr<U>& o)
{
RefPtr ptr = o;
swap(ptr);
return *this;
}
template<typename T> template<typename U> inline RefPtr<T>& RefPtr<T>::operator=(const RawPtr<U>& o)
{
RefPtr ptr = o.get();
swap(ptr);
return *this;
}
template<class T> inline void RefPtr<T>::swap(RefPtr& 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> inline T* getPtr(const RefPtr<T>& p)
{
return p.get();
}
template<typename T> class RefPtrValuePeeker {
public:
ALWAYS_INLINE RefPtrValuePeeker(T* p): m_ptr(p) { }
ALWAYS_INLINE RefPtrValuePeeker(std::nullptr_t): m_ptr(0) { }
template<typename U> RefPtrValuePeeker(const RefPtr<U>& p): m_ptr(p.get()) { }
template<typename U> RefPtrValuePeeker(const PassRefPtr<U>& p): m_ptr(p.get()) { }
ALWAYS_INLINE operator T*() const { return m_ptr; }
private:
T* m_ptr;
};
} // namespace WTF
using WTF::RefPtr;
using WTF::static_pointer_cast;
#endif // SKY_ENGINE_WTF_REFPTR_H_