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Re: _EXTRA inheritance crashing IDL [message #30196 is a reply to message #30194]

Wed, 10 April 2002 20:44

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

"David Fanning" <david@dfanning.com> wrote in message
news:MPG.171e9d5d95b9c99c98987f@news.frii.com...
> Rob Preece (Rob.Preece@msfc.nasa.gov) writes:
>> Has anyone seen a behavior where IDL 5.5 crashes on a call to a
>> subroutine with an added _EXTRA keyword? I have found the same
>> behavior on several different machines, Linux and Mac, which does
>> not exist under 5.4.
>
> Well, yes, it crashes IDL 5.5, but not IDL 5.4. But I don't think
> you can hold RSI responsible for using their keyword inheritance
> mechanism in such a bogus way. Formatting the keywords you want to
> pass as a structure (the way this was meant to work) is error free:
>
> PRO test1, _REF_EXTRA = extra
> testStuff = {TITLE:'bob',XTITLE:'jim',YTITLE:'mary'}
> test2, INDGEN (10), _Extra=Create_Struct(testStuff, 'XRange',[0,5])
> END

But Rob was trying to supply keywords to test1 and have them passed to
test2. And the way he did it is valid according to the IDL docs. See
heading "Keyword Inheritance", subheading "Selective Keyword
Redirection", where they give the example

PRO SOMEPROC, _REF_EXTRA = ex
ONE, _EXTRA=['MOOSE', 'SQUIRREL']
TWO, _EXTRA='SQUIRREL'
END

(Yes, it is odd that the variable name ex is not used.)

--
Mark Hadfield
m.hadfield@niwa.co.nz Ka puwaha et tai nei
http://katipo.niwa.co.nz/~hadfield Hoea tatou
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Re: _EXTRA inheritance crashing IDL By: David Fanning on Wed, 10 April 2002 21:42
		Re: _EXTRA inheritance crashing IDL By: Mark Hadfield on Wed, 10 April 2002 20:44
		Re: _EXTRA inheritance crashing IDL By: David Fanning on Wed, 10 April 2002 19:05
		Re: _EXTRA inheritance crashing IDL By: Mark Hadfield on Wed, 10 April 2002 15:41
		Re: _EXTRA inheritance crashing IDL By: Rob.Preece on Thu, 11 April 2002 13:21

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