AbaKus – a complex calculator
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#ifndef ABAKUS_SHARED_PTR_H
#define ABAKUS_SHARED_PTR_H
/*
* sharedptr.h - part of abakus
* Copyright (C) 2004, 2005 Michael Pyne <michael.pyne@kdemail.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <kdebug.h>
template <class T>
class SharedPtr
{
public:
typedef T value_type;
class Data
{
public:
Data(T *ptr = 0, unsigned refCount = 1) : m_ptr(ptr), m_refCount(refCount)
{
}
void deref()
{
--m_refCount;
if(!m_refCount) {
delete m_ptr;
m_ptr = 0;
}
}
void ref()
{
++m_refCount;
}
T *ptr() { return m_ptr; }
const T* ptr() const { return m_ptr; }
unsigned refCount() const { return m_refCount; }
private:
T *m_ptr;
unsigned m_refCount;
};
SharedPtr() : m_data(new Data)
{
}
SharedPtr(T* ptr) : m_data(new Data(ptr))
{
}
SharedPtr(const SharedPtr<T> &other) : m_data(other.m_data)
{
m_data->ref();
}
~SharedPtr()
{
m_data->deref();
}
SharedPtr<T> &operator=(const SharedPtr<T> &other)
{
if(&other == this)
return *this;
m_data->deref();
m_data = other.m_data;
m_data->ref();
return *this;
}
T *operator ->()
{
return m_data->ptr();
}
const T *operator ->() const
{
return m_data->ptr();
}
T &operator *()
{
return *m_data->ptr();
}
const T& operator *() const
{
return *m_data->ptr();
}
bool isNull() const { return m_data->ptr() == 0; }
unsigned refCount() const { return m_data->refCount(); }
private:
Data *m_data;
};
#endif /* ABAKUS_SHARED_PTR_H */
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