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/*
* Copyright (C) 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.
*
*/
#pragma once
#include <wtf/RefCountDebugger.h>
namespace WTF {
// This base class holds the non-template methods and attributes.
// The RefCounted class inherits from it reducing the template bloat
// generated by the compiler (technique called template hoisting).
class WTF_EMPTY_BASE_CLASS RefCountedBase : public RefCountDebugger {
public:
void ref() const
{
willRef(m_refCount);
++m_refCount;
}
bool hasOneRef() const { return m_refCount == 1; }
unsigned refCount() const { return m_refCount; }
protected:
RefCountedBase() = default;
~RefCountedBase()
{
willDestroy(m_refCount);
RELEASE_ASSERT(m_refCount == 1);
}
// Returns true if the pointer should be deleted.
bool derefBase() const
{
willDeref(m_refCount);
unsigned tempRefCount = m_refCount - 1;
if (!tempRefCount) {
willDelete();
return true;
}
m_refCount = tempRefCount;
return false;
}
private:
mutable unsigned m_refCount { 1 };
};
template<typename T> class RefCounted : public RefCountedBase {
WTF_MAKE_NONCOPYABLE(RefCounted);
WTF_DEPRECATED_MAKE_FAST_ALLOCATED(RefCounted);
public:
void deref() const
{
if (derefBase())
delete const_cast<T*>(static_cast<const T*>(this));
}
protected:
RefCounted() = default;
~RefCounted() = default;
} SWIFT_RETURNED_AS_UNRETAINED_BY_DEFAULT;
template<typename T>
inline void ref(T* obj)
{
obj->ref();
}
template<typename T>
inline void deref(T* obj)
{
obj->deref();
}
} // namespace WTF
using WTF::RefCounted;
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