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On Fri, Feb 15, 2008 at 9:13 AM, Lim Hock-Chai
<Lim.Hock-Chai@xxxxxxxxxxxxxxx> wrote:
is there a reason to ever use dealloc without the (n) extender?
--
Sure. Suppose you have a linked list, and have
allocated space for each node. Suppose you have
allocated space to hold all of the pointers to the
nodes (you might want to sort the linked list; it is much
easier to sort an array of pointers to linked list nodes
than it is to sort linked list nodes themselves - like
an old ADDROUT file).
After you dealloc all of the addresses to the nodes,
you are going to dealloc the space containing those addresses.
While you are deallocating the space pointed to by
a (linked list node) pointer you know the space
containing that pointer is going to be deallocated
as well, so it isn't necessary to initialize it.
In other words, if the pointer to the heap storage
being deallocated is, itself, in the heap, and going
to be deallocated, there is no need to set it to
null.
Chris
--
chris@xxxxxxxxx
pando.org
www.brilligware.com
midrange.com
