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Re: IDL Shapefile Object [message #28296 is a reply to message #28295]

Thu, 29 November 2001 15:47

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

From: "David Fanning" <david@dfanning.com>
> It has been pointed out to me that there is
> a new routine in IDL 5.5 called HEAP_FREE...
> ...
> Anyway, despite the documentation that is meant to
> frighten you away from using it (ala Heap_GC), it
> is designed to help you clean up in those situations
> where you don't know what it is you have been handed.

I note that the first "frightener" in the HEAP_FREE documentation is:

"When freeing object heap variables, HEAP_FREE calls OBJ_DESTROY
without supplying any plain or keyword arguments. Depending on the objects
being released, this may not be sufficient. In such cases, the caller must
call
OBJ_DESTROY explicitly with the proper arguments rather than using
HEAP_FREE."

Hey, I didn't know you *could* supply arguments to OBJ_DESTROY (though I
should have known because it's right there in the OBJ_DESTROY
documentation). Has anyone actually written code that *uses* this feature.
And if so, why? It seems to me that when you tell an object to destroy
itself, then it's up to the object to know how to do it.

---
Mark Hadfield
m.hadfield@niwa.cri.nz http://katipo.niwa.cri.nz/~hadfield
National Institute for Water and Atmospheric Research

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[Message index]

		Re: IDL Shapefile Object By: Kelly Dean on Fri, 30 November 2001 11:52
		Re: IDL Shapefile Object By: alt on Thu, 29 November 2001 19:29
		Re: IDL Shapefile Object By: Mark Hadfield on Thu, 29 November 2001 17:26
		Re: IDL Shapefile Object By: David Fanning on Thu, 29 November 2001 16:40
		Re: IDL Shapefile Object By: Mark Hadfield on Thu, 29 November 2001 15:47
		Re: IDL Shapefile Object By: David Fanning on Thu, 29 November 2001 14:31
		Re: IDL Shapefile Object By: David Fanning on Thu, 29 November 2001 13:26
		Re: IDL Shapefile Object By: mvukovic on Mon, 03 December 2001 07:15

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