template <class T>

T ImpCola<T>::Quitar(){

if(last == NULL) return NULL;

T ret = last->dato;

if(!esVacia()){

PtrNodoC aux = first;

while(aux->sig != last)

aux = aux->sig;

PtrNodoC toDelete = last;

last = aux;

ret = toDelete->dato;

delete toDelete;

}

return ret;

}