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Re: _extra keyword [message #43379 is a reply to message #43326]

Thu, 07 April 2005 05:33

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Antonio writes:

> Yes I think that's I want but....
> but in the procedure that I try to use this keyword seems not to run.
> The compiler don't made error message but there's no evident effect of
> this keyword in my plot (a map).
> More simply:
> if I have a _extra keyword in a procedure how can I use it?
> I can use EVERY other keyword of the procedure associated to them?

The problem (and beauty) of _EXTRA is that unknown
keywords are silently ignored by the procedures that
use this mechanism. In practice, this means that if you
misspell a keyword, no one ever complains, but the keyword
has no effect, either. I strongly suspect that is your
problem.

One way to handle this problem is to use the _STRICT_EXTRA
keyword (in place of _EXTRA) on the last procedure or function
in the keyword inheritance chain. The _STRICT_EXTRA *will*
complain if it gets a keyword it doesn't understand, so you
can use this to trap for misspelled keywords.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		_extra keyword By: antonioolita on Fri, 01 April 2005 02:12
		Re: _extra keyword By: David Fanning on Thu, 07 April 2005 12:58
		Re: _extra keyword By: Michael Wallace on Thu, 07 April 2005 12:52
		Re: _extra keyword By: David Fanning on Thu, 07 April 2005 05:33
		Re: _EXTRA KEYWORD By: dandan on Wed, 04 November 2009 23:37
		Re: _EXTRA KEYWORD By: David Fanning on Wed, 04 November 2009 15:22
		Re: _EXTRA KEYWORD By: David Fanning on Wed, 11 November 2009 19:01
		Re: _EXTRA KEYWORD By: Michael Galloy on Wed, 11 November 2009 18:54
		Re: _EXTRA KEYWORD By: David Fanning on Wed, 11 November 2009 17:36
		Re: _EXTRA KEYWORD By: ben.bighair on Wed, 11 November 2009 16:23
		Re: _EXTRA KEYWORD By: mankoff on Wed, 11 November 2009 14:47

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