| Re: Undefining a variable a pointer points to [message #39321] |
Sun, 16 May 2004 23:10 |
![marc schellens[1] is currently offline](theme/default/images/xoffline.png.pagespeed.ic.XRkd1fkXye.png "marc schellens[1] is currently offline")
marc schellens[1]
Messages: 183
Registered: January 2000
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Senior Member |
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Benjamin Hornberger wrote:
> Hi all,
>
> 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)?
>
> Thanks for your help,
> Benjamin
dummy=temporary(*p) would also work.
HDH,
marc
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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
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Senior Member |
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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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