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Re: On Pointers and Culture [message #42987 is a reply to message #42985]

Fri, 04 March 2005 06:05

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Antonio Santiago writes:

> If you are new on IDL pointers remember are not the same as C pointers.

Another way they are different, and this surprises even
people who have used them for awhile, is that they are
much more forgiving of rough handling. More like
IDL variables, really, than pointers. So you can
do something like this:

ptr = Ptr_New([1,4,6]) ; Pointer to array
*ptr = 8.4 ; Pointer now points to scalar
Print, *ptr
8.4

And there is no leaking of memory because IDL
manages all this for you, as it does with variables.
Naturally, this is dangerous, etc., but it is
so, so nice. :-)

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]

		Re: On Pointers and Culture By: David Fanning on Fri, 04 March 2005 12:28
		Re: On Pointers and Culture By: JD Smith on Fri, 04 March 2005 12:01
		Re: On Pointers and Culture By: David Fanning on Fri, 04 March 2005 08:06
		Re: On Pointers and Culture By: David Fanning on Fri, 04 March 2005 08:04
		Re: On Pointers and Culture By: Benjamin Hornberger on Fri, 04 March 2005 07:47
		Re: On Pointers and Culture By: Benjamin Hornberger on Fri, 04 March 2005 07:46
		Re: On Pointers and Culture By: David Fanning on Fri, 04 March 2005 06:05
		Re: On Pointers and Culture By: Antonio Santiago on Fri, 04 March 2005 05:13
		Re: On Pointers and Culture By: David Lopez Pons on Fri, 04 March 2005 03:25
		Re: On Pointers and Culture By: Antonio Santiago on Fri, 04 March 2005 00:16

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