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Re: wrapper functions [message #50635 is a reply to message #50504]

Fri, 06 October 2006 06:34

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Dometz writes:

> Wow, I got you guys started on something here... thanks for your input.

We're bored. :-)

> So assuming that READ_PICT would also have some keyword parameters,
> then I could use REF_EXTRA in the following way... correct?
>
> pro READ_PICT_WRAPPER, Filename, Image, R, G, B, _REF_EXTRA=E
> case (N_PARAMS()) of
> 5: READ_PICT, Filename, Image, R, G, B, _EXTRA=E
> 4: READ_PICT, Filename, Image, R, G, _EXTRA=E
> 3: READ_PICT, Filename, Image, R, _EXTRA=E
> 2: READ_PICT, Filename, Image, _EXTRA=E
> else: message, "READ_PICT must have at least two parameters"

You could, but the chance of someone passing an R
vector without a G and B vector must be within the
floating underflow error of zero. Why waste time
coding for things that aren't going to happen? :-)

> For the second option: Could I build an array for { Filename, Image, R,
> G, B} and pass it in?

No.

If I were coding this wrapper, I would write it like this

FUNCTION READ_PICT_WRAPPER, filename, r, g, b, _REF_EXTRA=extra
IF N_Elements(filename) EQ 0 THEN Message, 'Must pass a filename.'
READ_PICT, filename, image, r, g, b, _EXTRA=extra
RETURN, image
END

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		wrapper functions By: Dominic Metzger on Thu, 05 October 2006 16:30
		Re: wrapper functions By: JD Smith on Mon, 09 October 2006 11:03
		Re: wrapper functions By: Dominic Metzger on Fri, 06 October 2006 14:06
		Re: wrapper functions By: Dominic Metzger on Fri, 06 October 2006 14:02
		Re: wrapper functions By: David Fanning on Fri, 06 October 2006 13:42
		Re: wrapper functions By: Dominic Metzger on Fri, 06 October 2006 13:35
		Re: wrapper functions By: David Fanning on Fri, 06 October 2006 12:47
		Re: wrapper functions By: Dominic Metzger on Fri, 06 October 2006 12:42
		Re: wrapper functions By: David Fanning on Fri, 06 October 2006 09:35
		Re: wrapper functions By: news.qwest.net on Fri, 06 October 2006 09:16
		Re: wrapper functions By: David Fanning on Fri, 06 October 2006 08:58
		Re: wrapper functions By: news.qwest.net on Fri, 06 October 2006 08:36
		Re: wrapper functions By: news.qwest.net on Fri, 06 October 2006 08:35
		Re: wrapper functions By: David Fanning on Fri, 06 October 2006 06:34

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