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Re: Structure field concatenation [message #21664 is a reply to message #21614]

Wed, 06 September 2000 07:35

davidf
Messages: 2866
Registered: September 1996

Senior Member

Martin Schultz (martin.schultz@dkrz.de) writes:

> Only if you want
> to replace the data in a structure element, then you need to free
> the pointer beforehand:
>
> ;; Replace data of first structure
> IF Ptr_Valid(periodcube[0].freq) THEN Ptr_Free,
> periodcube[0].freq
> periodcube[0].freq = Ptr_New( DIndgen(200)*0.1 )

Actually, as I've been trying to point out for
months now to no avail, it is NOT necessary to
free the pointer in this instance. IDL *takes
care of the memory management for you*. :-)

IF Ptr_Valid(periodcube[0].freq) THEN $
*periodcube[0].freq = newThingy

Cheers,

David

P.S. I'm sure Martin knows this. He is just being
thorough. A trait I have noticed among Germans. :-)

--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Structure field concatenation By: Ben Tupper on Thu, 31 August 2000 08:02
		Re: Structure field concatenation By: davidf on Thu, 07 September 2000 07:31
		Re: Structure field concatenation By: John-David T. Smith on Mon, 11 September 2000 12:22
		Re: Structure field concatenation By: Amara Graps on Mon, 11 September 2000 04:04
		Re: Structure field concatenation By: Martin Schultz on Thu, 07 September 2000 00:46
		Re: Structure field concatenation By: John-David T. Smith on Mon, 11 September 2000 11:59
		Re: Structure field concatenation By: davidf on Wed, 06 September 2000 13:43
		Re: Structure field concatenation By: John-David T. Smith on Wed, 06 September 2000 13:34
		Re: Structure field concatenation By: davidf on Wed, 06 September 2000 08:24
		Re: Structure field concatenation By: Martin Schultz on Wed, 06 September 2000 08:13
		Re: Structure field concatenation By: davidf on Wed, 06 September 2000 07:35
		Re: Structure field concatenation By: Liam E. Gumley on Wed, 06 September 2000 07:26
		Re: Structure field concatenation By: Martin Schultz on Wed, 06 September 2000 07:16
		Re: Structure field concatenation By: Ben Tupper on Mon, 11 September 2000 15:28

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