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/*****************************************************************************
* *
* PrimeSense PSCommon Library *
* Copyright (C) 2012 PrimeSense Ltd. *
* *
* This file is part of PSCommon. *
* *
* Licensed under the Apache License, Version 2.0 (the "License"); *
* you may not use this file except in compliance with the License. *
* You may obtain a copy of the License at *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, software *
* distributed under the License is distributed on an "AS IS" BASIS, *
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
* See the License for the specific language governing permissions and *
* limitations under the License. *
* *
*****************************************************************************/
#ifndef _XN_SMART_POINTER_H_
#define _XN_SMART_POINTER_H_
#include <stdio.h>
namespace xnl
{
template <class T>
class SmartPointer
{
public:
SmartPointer(T* ptr = 0, bool takeCharge = true) :
m_pCounterPtr(0)
{
if (ptr != 0)
{
m_pCounterPtr = XN_NEW(CountedPointer, ptr, takeCharge);
}
}
SmartPointer(const SmartPointer<T>& other)
{
acquire(other.m_pCounterPtr);
}
SmartPointer& operator=(const SmartPointer& other)
{
if (m_pCounterPtr != other.m_pCounterPtr)
{
release();
acquire(other.m_pCounterPtr);
}
return *this;
}
virtual ~SmartPointer()
{
release();
}
bool operator==(const SmartPointer& other) const
{
return (m_pCounterPtr == other.m_pCounterPtr);
}
bool operator!=(const SmartPointer& other) const
{
return (m_pCounterPtr != other.m_pCounterPtr);
}
T& operator*() const
{
return *m_pCounterPtr->ptr;
}
T* operator->() const
{
return m_pCounterPtr->ptr;
}
T* get() const
{
return m_pCounterPtr!=NULL?m_pCounterPtr->ptr:NULL;
}
private:
class CountedPointer
{
public:
CountedPointer(T* ptr, bool takeCharge) :
ptr(ptr), refcount(1), takeCharge(takeCharge)
{}
T* ptr;
int refcount;
bool takeCharge;
};
void acquire(CountedPointer* pOther)
{
m_pCounterPtr = pOther;
if (m_pCounterPtr != 0)
{
++m_pCounterPtr->refcount;
}
}
void release()
{
printf("--> Release\n");
if (m_pCounterPtr != 0)
{
--m_pCounterPtr->refcount;
if (m_pCounterPtr->refcount == 0)
{
printf("Deleting\n");
if (m_pCounterPtr->takeCharge)
{
printf("Deleting internal\n");
XN_DELETE(m_pCounterPtr->ptr);
}
XN_DELETE(m_pCounterPtr);
}
m_pCounterPtr = 0;
}
printf("<-- Release\n");
}
CountedPointer* m_pCounterPtr;
};
} // xnl
#endif // _XN_SMART_POINTER_H_
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