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Re: Pointer syntax and IDL 4.0 [message #28532 is a reply to message #28531]

Wed, 19 December 2001 13:07

Paul van Delst
Messages: 364
Registered: March 1997

Senior Member

tam wrote:
>
> Recently I upgraded the a couple of routines to use pointers
> in certain special cases. However the pointer dereference operator
> is illegal prior to version 5.0, so the code fails to compile on
> older versions of IDL -- though the great majority of the code is still
> useful there. It would be nice to be able to use a single
> version of code to support all users, so I'm asking the question:
> Is there any way of addressing this, i.e., dereferencing a pointer
> in a way that will not cause a syntax error for earlier versions of IDL?
>
> An obvious solution would be if there were a dereferencing function
> as well as an operator...
>
> x = ptr_val(some_pointer)
>
> would be the same as
>
> x = *some_pointer
>
> but I don't think IDL supplies one. If I write this one-liner
> myself, I may reduce the number of errors in the code to one
> but I'd prefer to make it completely transparent...
>
> Any ideas?

Have a lookie at:

http://cimss.ssec.wisc.edu/~gumley/pointers.html

--
Paul van Delst Religious and cultural
CIMSS @ NOAA/NCEP purity is a fundamentalist
Ph: (301)763-8000 x7274 fantasy
Fax:(301)763-8545 V.S.Naipaul

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[Message index]

		Re: Pointer syntax and IDL 4.0 By: John-David T. Smith on Wed, 19 December 2001 13:59
		Re: Pointer syntax and IDL 4.0 By: thompson on Wed, 19 December 2001 13:11
		Re: Pointer syntax and IDL 4.0 By: Pavel A. Romashkin on Wed, 19 December 2001 13:01
		Re: Pointer syntax and IDL 4.0 By: Paul van Delst on Wed, 19 December 2001 13:07
		Re: Pointer syntax and IDL 4.0 By: Craig Markwardt on Wed, 19 December 2001 15:36

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