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/*
* Dibbler - a portable DHCPv6
*
* authors: Tomasz Mrugalski <thomson@klub.com.pl>
* Marek Senderski <msend@o2.pl>
*
* $Id: SmartPtr.h,v 1.7 2007-01-02 01:39:01 thomson Exp $
*
* $Log: SmartPtr.h,v $
* Revision 1.7 2007-01-02 01:39:01 thomson
* Code cleanup.
*
* Revision 1.6 2006-12-25 20:47:01 thomson
* Some memory leaks fixes, valgrind info added.
*
* Revision 1.5 2006-07-03 18:01:51 thomson
* SPtr define added.
*
* Revision 1.4 2004/06/04 19:47:06 thomson
* Various fixes.
*
* Revision 1.3 2004/06/04 16:55:27 thomson
* *** empty log message ***
*
* Revision 1.2 2004/03/29 22:06:49 thomson
* 0.1.1 version
*
*
* Released under GNU GPL v2 licence
*
*/
#ifndef SMARTPTR_H
#define SMARTPTR_H
#include <iostream>
#define SPtr SmartPtr
class Ptr {
public:
//constructor used in case of NULL SmartPtr
Ptr() {
ptr=NULL;
refcount=1;
}
//Constructor used in case of non NULL SmartPtr
Ptr(void* sth) {
ptr=sth;
refcount=1;
}
~Ptr() {
//if(ptr) delete ptr;
}
int refcount; //refrence counter
void * ptr; //pointer to the real object
};
template <class T>
class SmartPtr
{
//Don't use this class alone, it's used only in casting
//one smartpointer to another smartpointer
//e.g.
//SmartPtr<a> a(new a()); SmartPtr<b> b(new(b)); a=b;
public:
SmartPtr();
SmartPtr(T* something);
SmartPtr(Ptr *voidptr) {
if(voidptr)
{
this->ptr=voidptr;
this->ptr->refcount++;
}
else
this->ptr=new Ptr();
}
SmartPtr(const SmartPtr & ref);
SmartPtr(int onlyNull);
SmartPtr& operator=(const SmartPtr& old);
operator Ptr*() {
if (this->ptr->ptr)
return this->ptr;
else
return (Ptr*)NULL;
}
int refCount();
~SmartPtr();
T& operator*() const;
T* operator->() const;
private:
Ptr * ptr;
};
template <class T> SmartPtr<T>::SmartPtr() {
ptr = new Ptr();
}
template <class T> int SmartPtr<T>::refCount() {
if (this->ptr)
return this->ptr->refcount;
return 0;
}
template <class T>
SmartPtr<T>::SmartPtr(T* something) {
ptr = new Ptr(something);
}
template <class T>
SmartPtr<T>::SmartPtr(const SmartPtr& old) {
old.ptr->refcount++;
this->ptr = old.ptr;
this->ptr->refcount=old.ptr->refcount;
}
template <class T>
SmartPtr<T>::~SmartPtr() {
if (!(--(ptr->refcount))) {
delete (T*)(ptr->ptr);
delete ptr;
}
}
template <class T>
T& SmartPtr<T>::operator*() const {
return *((T*)(ptr->ptr)); //it can return NULL
}
template <class T>
T* SmartPtr<T>::operator->() const {
if (!ptr) {
return 0;
}
return (T*)(ptr->ptr); //it can return NULL
}
//It's is called in eg. instrusction: return NULL;
//and SmartPtr is returned in function
template <class T>
SmartPtr<T>::SmartPtr(int )
{
ptr=new Ptr(); //this->ptr->ptr is NULL
}
template <class T>
SmartPtr<T>& SmartPtr<T>::operator=(const SmartPtr& old) {
if (this==&old)
return *this;
if (this->ptr)
if(!(--this->ptr->refcount))
{
delete (T*)(this->ptr->ptr);
delete this->ptr;
this->ptr=NULL;
}
this->ptr=old.ptr;
old.ptr->refcount++;
// cout << "operator=" << endl;
return *this;
}
#endif
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