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Re: IDL objects (not object graphics) tutorial? [message #46612 is a reply to message #46457]

Fri, 02 December 2005 08:11

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Paul Van Delst writes:

> Your webpage is great! The one new thing I learned:
>
> self.ptr=ptr_new(/allocate)
>
> can be used to subsequently point to anything without further allocation!? E.g. from your
> tutorial:
>
> a->set,image
> or
> a->set,!d
>
> where in the set method, the value is simply assigned:
> *(self.ptr)=value
>
> Excuse my brain-deadedness, but how is this possible? I looked at the IDL docs but there
> is (surprise, surprise) no elaboration about this little nugget of information regarding
> PTR_NEW. Wouldn't susbsequent calls like the above cause a memory leak, e.g.
>
> IDL> image=findgen(512,512)
> IDL> a=obj_new('data') ;-- create object variable a
> IDL> a->set,image ;-- insert image
> IDL> a->set,!d
>
> What would happen to the "image" data?

The deep answers are all contained in the Pointer Tutorial:

http://www.dfanning.com/misc_tips/pointers.html

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]

		IDL objects (not object graphics) tutorial? By: Richard French on Wed, 23 November 2005 18:33
		Re: IDL objects (not object graphics) tutorial? By: b_gom on Thu, 24 November 2005 01:04
		Re: IDL objects (not object graphics) tutorial? By: Paul Van Delst[1] on Fri, 02 December 2005 08:30
		Re: IDL objects (not object graphics) tutorial? By: David Fanning on Fri, 02 December 2005 08:11
		Re: IDL objects (not object graphics) tutorial? By: Paul Van Delst[1] on Fri, 02 December 2005 07:46
		Re: IDL objects (not object graphics) tutorial? By: Richard French on Wed, 30 November 2005 18:36
		Re: IDL objects (not object graphics) tutorial? By: dzarro on Tue, 29 November 2005 20:20

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