comp.lang.idl-pvwave archive: archive » Re: IDL Shapefile Object

Home » Public Forums » archive » Re: IDL Shapefile Object

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: IDL Shapefile Object [message #28295 is a reply to message #28294]

Thu, 29 November 2001 16:40

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Mark Hadfield (m.hadfield@niwa.cri.nz) writes:

> 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.

I've never used it. (Guess I should make a habit
of reading the documentation that *is* there!)
But I can imagine a case for it.

Suppose one of the fields for the object was a
pointer to some image data. The same image pointer
might be present in several objects (to save
copying the huge image). Any decent object cleanup
routine would certainly free the pointer, but maybe
you don't want it destroyed because then the other
objects that are using it wouldn't work properly.

In this case a HANG_ON_DONT_DO_IT keyword on the cleanup
method might be appropriate.

Cheers,

David

--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

Report message to a moderator

[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

Previous Topic:	Re: Sparse matrix algorithms
Next Topic:	Re: Setting history size in idlwave

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 19:03:13 PDT 2025

Total time taken to generate the page: 0.00448 seconds