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Re: wrapper functions [message #50623 is a reply to message #50504]

Fri, 06 October 2006 12:42

Dominic Metzger
Messages: 30
Registered: August 2006

Member

Hmmm, well, my problem is that these wrappers should be transparent,
meaning that all the error messages should be the same with or without
the wrapper.

Is this duable?

thanks & best regards,

dometz

David Fanning wrote:
> 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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