Re: problem with linklist

Andre Kostur <>
Thu, 5 Jul 2007 17:26:12 +0000 (UTC)
Erik Wikstr?m <> wrote in news:I69ji.3524$ZA.1535

On 2007-07-05 17:12, wrote:

template<class T>
void TimerDLList<T>::addFirst(TimerItem<T>* const itemPtr)
// suppose itemPtr is not pointing to NULL

   itemPtr->prev = (TimerItem<T>*) NULL;

head = (TimerItem<T>*)NULL;

   if (tail == (TimerItem<T>*)NULL ) // nothing in the link list
      tail = itemPtr;
      itemPtr->next = (TimerItem<T>*) NULL;
      itemPtr->next = head;
      head->prev = itemPtr;

head == NULL here, you made it so a bit up. By the way, we use 0 and not
NULL in C++.

Not necessarily true (I still prefer to use NULL, I like the visual
reminder that I'm talking about a pointer and not an int. When 'nulptr'
becomes Standard, I'll be really happy. However, we do tend to not ever
cast NULL (or 0) to a specific pointer type. There should be no need to.

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