подскажите template<class> (Шаблоны и указатели)

#ifndef _CIRCL_H
#define _CIRCL_H
 
template <class t>
class circl{
private:
circl *pNext,*pBack;
public:
t data;
circl();
circl(t T);
circl(t T,circl *back,circl *next);
~circl();
circl* push(circl *pHead,t T);
circl* remove(circl *pHead);
circl* mover(circl *pHead);
circl* movel(circl *pHead);
};
 
#endif  /* _CIRCL_H */

#include "circl.h"
#define NULL 0;
template <class t>
circl< t >::circl()
{pNext=pBack=NULL;}
template <class t>
circl< t >::circl(t T)
{pNext=pBack=this;data=T;}
template <class t>
circl< t >::circl(t T,circl *back,circl *next)
{pNext=next;pBack=back;data=T;}
 
template <class t>
circl<t>::~circl(){}
template <class t>
circl* circl<t>::push(circl *pHead,t T)
{
circl *tmp=new circl(T,pHead,pHead->pNext);
pHead->pNext=tmp;
return pHead->pNext;
}
template <class t>
circl* circl<t>::remove(circl *pHead)
{
pHead->pNext->pBack=pHead->pBack;
pHead->pBack->pNext=pHead->pNext;
circl *tmp=pHead;
pHead=pHead->pBack;
delete tmp;
return pHead;
}
template <class t>
circl * circl<t>::mover(circl *pHead)
{
return pHead->pNext;
}
template <class t>
circl* circl<t>::movel(circl *pHead)
{
return pHead->pBack;
}