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Re: Undefining a variable a pointer points to [message #39332 is a reply to message #39321]

Fri, 14 May 2004 14:30

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Benjamin Hornberger writes:

> is there a way to undefine the variable a pointer points to? E.g., if I
> initialize a pointer by
>
> p = ptr_new(/allocate_heap)
>
> p is a valid pointer, but *p is undefined. If I now do
>
> *p = 10
>
> is there a way to undefine it again afterwards, i.e. get back to the
> status right after the call to ptr_new(/allocate_heap)?

Well, not sure *why* you want to be doing this, but if
it's necessary, you can do this:

Ptr_Free, p
p = Ptr_New(/Allocate_Heap)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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		Re: Undefining a variable a pointer points to By: marc schellens[1] on Sun, 16 May 2004 23:10
		Re: Undefining a variable a pointer points to By: David Fanning on Fri, 14 May 2004 14:30

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