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Re: pointer to structures [message #19560 is a reply to message #19558]

Tue, 04 April 2000 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

J.D. Smith (jdsmith@astro.cornell.edu) writes:

> Uh oh... forgot to test your code I'm afraid. You have the precendence correct,
> but the solution reversed. You must force the pointer dereference to occur
> *before* structure dereference... see the other posts.
>
> If you had something like this:
>
> filter={points:ptr_new(['a','b']),pt1_value:200, pt2_value:'X_WHYLOG'}
>
> You can use the precendence to your advantage, visa vis:
>
> print,*filter.points
>
> Keeping the precendence in mind can eliminate extraneous parentheses, which, for
> everyone except lisp programmers, often add confusion.

Sorry. I'm getting the house ready to sell and I should
know better than to check the newsgroup while I'm waiting
for the trim to dry. :-(

Cheers,

David

P.S. I'll check in next week. :-(

--
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/
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[Message index]

		Re: pointer to structures By: John-David T. Smith on Wed, 05 April 2000 00:00
		Re: pointer to structures By: Liam E. Gumley on Wed, 05 April 2000 00:00
		Re: pointer to structures By: John-David T. Smith on Tue, 04 April 2000 00:00
		Re: pointer to structures By: Liam E. Gumley on Tue, 04 April 2000 00:00
		Re: pointer to structures By: davidf on Tue, 04 April 2000 00:00
		Re: pointer to structures By: Ben Tupper on Tue, 04 April 2000 00:00
		Re: pointer to structures By: John-David T. Smith on Tue, 04 April 2000 00:00
		Re: pointer to structures By: John-David T. Smith on Tue, 04 April 2000 00:00
		Re: pointer to structures By: davidf on Tue, 04 April 2000 00:00
		Re: pointer to structures By: wbiagiot on Tue, 04 April 2000 00:00
		Re: pointer to structures By: Liam E. Gumley on Tue, 04 April 2000 00:00
		Re: pointer to structures By: Ben Tupper on Tue, 04 April 2000 00:00

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