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#ifndef ABAKUS_SHARED_PTR_H
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#define ABAKUS_SHARED_PTR_H
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/*
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* sharedptr.h - part of abakus
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* Copyright (C) 2004, 2005 Michael Pyne <michael.pyne@kdemail.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <kdebug.h>
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template <class T>
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class SharedPtr
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{
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public:
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typedef T value_type;
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class Data
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{
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public:
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Data(T *ptr = 0, unsigned refCount = 1) : m_ptr(ptr), m_refCount(refCount)
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{
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}
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void deref()
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{
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--m_refCount;
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if(!m_refCount) {
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delete m_ptr;
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m_ptr = 0;
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}
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}
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void ref()
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{
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++m_refCount;
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}
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T *ptr() { return m_ptr; }
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const T* ptr() const { return m_ptr; }
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unsigned refCount() const { return m_refCount; }
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private:
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T *m_ptr;
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unsigned m_refCount;
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};
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SharedPtr() : m_data(new Data)
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{
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}
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SharedPtr(T* ptr) : m_data(new Data(ptr))
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{
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}
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SharedPtr(const SharedPtr<T> &other) : m_data(other.m_data)
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{
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m_data->ref();
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}
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~SharedPtr()
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{
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m_data->deref();
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}
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SharedPtr<T> &operator=(const SharedPtr<T> &other)
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{
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if(&other == this)
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return *this;
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m_data->deref();
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m_data = other.m_data;
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m_data->ref();
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return *this;
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}
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T *operator ->()
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{
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return m_data->ptr();
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}
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const T *operator ->() const
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{
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return m_data->ptr();
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}
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T &operator *()
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{
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return *m_data->ptr();
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}
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const T& operator *() const
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{
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return *m_data->ptr();
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}
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bool isNull() const { return m_data->ptr() == 0; }
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unsigned refCount() const { return m_data->refCount(); }
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private:
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Data *m_data;
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};
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#endif /* ABAKUS_SHARED_PTR_H */
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// vim: set et ts=8 sw=4:
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