| Re: Proper pointer cleanup question [message #34651 is a reply to message #34648] |
Tue, 08 April 2003 17:09   |
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Paul Van Delst[1]
Messages: 1157
Registered: April 2002
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Senior Member |
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JD Smith wrote:
>
> On Mon, 07 Apr 2003 16:01:27 -0700, M. Katz wrote:
>
>> I want to make sure I'm taking all the steps necessary to clean up
>> pointers and free memory when I'm done with them. Here's an example.
>>
>> Suppose I have a pointer to a structure that contains pointers.
>>
>> a = ptr_new({n:10, p:ptrarr(10)})
<snip>
>> 2) a and all of its dependent pointers: for i=0,n_elements( (*a).p )-1
>> do $
>> ptr_free, ((*a).p)(i)
>> ptr_free, a
>>
<snip>
> Another option is:
>
> heap_free,a
>
> which will accomplish the same as #2 (avoiding a memory leak), and is
> only slightly slower. When you're feeling truly lazy, it's quite a
> blessing. You have no flexibility to pick and choose what to parts of
> a data structure to free, but often this isn't an issue.
Wha..? Is that another one of those undocumented IDL routines? It works on my current
version, but bugger me if I can find it documented anywhere.
paulv
--
Paul van Delst
CIMSS @ NOAA/NCEP/EMC
Ph: (301)763-8000 x7748
Fax:(301)763-8545
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