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/****************************************************************************
**
** Copyright (C) 2008-2012 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QT3DS_FOUNDATION_QT3DS_REFCOUNTED_H
#define QT3DS_FOUNDATION_QT3DS_REFCOUNTED_H
#include "foundation/Qt3DS.h"
#include "foundation/Qt3DSNoCopy.h"
namespace qt3ds {
namespace foundation {
/**
Marker class for objects that have a release method that is expected
to destroy or release the object.
*/
class NVReleasable
{
protected:
virtual ~NVReleasable() {}
public:
virtual void release() = 0;
};
template <typename TObjType>
inline void NVSafeRelease(TObjType *&item)
{
if (item) {
item->release();
item = NULL;
}
}
/**Scoped pointer that releases its data
when it is being destroyed*/
template <typename TObjType>
struct NVScopedReleasable : public NoCopy
{
TObjType *mPtr;
NVScopedReleasable()
: mPtr(NULL)
{
}
NVScopedReleasable(TObjType *item)
: mPtr(item)
{
}
NVScopedReleasable(TObjType &item)
: mPtr(&item)
{
}
~NVScopedReleasable() { NVSafeRelease(mPtr); }
NVScopedReleasable &operator=(TObjType *inItem)
{
if (inItem != mPtr) {
if (mPtr)
mPtr->release();
mPtr = inItem;
}
return *this;
}
NVScopedReleasable &operator=(const NVScopedReleasable<TObjType> inItem)
{
QT3DS_ASSERT(false);
// try to do the right thing.
mPtr = inItem.mPtr;
const_cast<NVScopedReleasable<TObjType> &>(inItem).mPtr = NULL;
return *this;
}
TObjType *forget_unsafe()
{
mPtr = NULL;
return mPtr;
}
TObjType *operator->() { return mPtr; }
const TObjType *operator->() const { return mPtr; }
TObjType &operator*() { return *mPtr; }
const TObjType &operator*() const { return *mPtr; }
operator TObjType *() { return mPtr; }
operator const TObjType *() const { return mPtr; }
};
// Marker class for objects that are ref counted.
class NVRefCounted : public NVReleasable
{
public:
virtual void addRef() = 0;
};
/**Helpers to make implementing ref counted objects as concise as possible*/
#define QT3DS_IMPLEMENT_REF_COUNT_RELEASE(alloc) \
QT3DSI32 value = atomicDecrement(&mRefCount); \
if (value <= 0) \
NVDelete(alloc, this);
#define QT3DS_IMPLEMENT_REF_COUNT_ADDREF_RELEASE(alloc) \
void addRef() { atomicIncrement(&mRefCount); } \
void release() { QT3DS_IMPLEMENT_REF_COUNT_RELEASE(alloc); }
#define QT3DS_IMPLEMENT_REF_COUNT_ADDREF_RELEASE_OVERRIDE(alloc) \
void addRef() override { atomicIncrement(&mRefCount); } \
void release() override { QT3DS_IMPLEMENT_REF_COUNT_RELEASE(alloc); }
/**Safe function that checks for null before addrefing the object*/
template <typename TObjType>
inline TObjType *NVSafeAddRef(TObjType *item)
{
if (item) {
item->addRef();
}
return item;
}
/**Scoped pointer that addref's its data upon acquisition and releases its data
when it is being destroyed*/
template <typename TObjType>
struct NVScopedRefCounted
{
TObjType *mPtr;
~NVScopedRefCounted() { NVSafeRelease(mPtr); }
NVScopedRefCounted(TObjType *item = NULL)
: mPtr(item)
{
NVSafeAddRef(mPtr);
}
NVScopedRefCounted(TObjType &item)
: mPtr(&item)
{
NVSafeAddRef(mPtr);
}
NVScopedRefCounted(const NVScopedRefCounted<TObjType> &other)
: mPtr(const_cast<TObjType *>(other.mPtr))
{
NVSafeAddRef(mPtr);
}
NVScopedRefCounted<TObjType> &operator=(const NVScopedRefCounted<TObjType> &other)
{
if (other.mPtr != mPtr) {
NVSafeRelease(mPtr);
mPtr = const_cast<TObjType *>(other.mPtr);
NVSafeAddRef(mPtr);
}
return *this;
}
TObjType *forget_unsafe()
{
mPtr = NULL;
return mPtr;
}
TObjType *operator->() { return mPtr; }
const TObjType *operator->() const { return mPtr; }
TObjType &operator*() { return *mPtr; }
const TObjType &operator*() const { return *mPtr; }
operator TObjType *() { return mPtr; }
operator const TObjType *() const { return mPtr; }
bool operator==(NVScopedRefCounted<TObjType> &inOther) const
{
return mPtr == inOther.mPtr;
}
bool operator!=(NVScopedRefCounted<TObjType> &inOther) const
{
return mPtr != inOther.mPtr;
}
};
}
}
#endif
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