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Re: IDL objects (not object graphics) tutorial? [message #46614 is a reply to message #46457]

Fri, 02 December 2005 07:46

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

dzarro@yahoo.com wrote:
> Hi,
>
> I have a tutorial at http://orpheus.nascom.nasa.gov/~zarro/idl/objects
> that I developed at NASA/GSFC.

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?

paulv

--
Paul van Delst
CIMSS @ NOAA/NCEP/EMC

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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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