| Re: idl_conatiner::get and position [message #42766] |
Thu, 24 February 2005 16:01  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Ben Tupper writes:
> When GETting objects in a container the POSITION keyword specifies the location
> of the objects needed. But they aren't returned in that order. They are
> returned in the order they are stored (first in - first out).
>
> Is there a way around this other than writing a method override?
We have run into this problem, too. Our sub-classed container
can either be normal or "indexed", in which case when you
remove something from a container it is replaced by a null
object, so that the position of the other objects in the container
is preserved.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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| Re: idl_conatiner::get and position [message #42932 is a reply to message #42766] |
Mon, 28 February 2005 07:16  |
btt
Messages: 345
Registered: December 2000
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Senior Member |
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David Fanning wrote:
> Ben Tupper writes:
>
>
>> When GETting objects in a container the POSITION keyword specifies the location
>> of the objects needed. But they aren't returned in that order. They are
>> returned in the order they are stored (first in - first out).
>>
>> Is there a way around this other than writing a method override?
>
>
> We have run into this problem, too. Our sub-classed container
> can either be normal or "indexed", in which case when you
> remove something from a container it is replaced by a null
> object, so that the position of the other objects in the container
> is preserved.
>
Interesting. I haven't had the need to preserve the space occupied by a removed
object.
Here's how I think I'll handle to first-in first-out ordering (or at least
something like this.)
FUNCTION myContainer::Get, $
COUNT = count, $
NOSORT = nosort, $
POSITION = position, $
_EXTRA = extra
nP = n_elements(position)
If keyword_Set(NoSort) AND (nP GT 1) Then Begin
arr = objarr(nP)
For i = 0, nP-1 Do $
arr[i] = self->Get(position = position[i], _EXTRA = extra)
count = nP
EndIf Else Begin
arr = $
self->IDL_CONTAINER::Get(position = position, $
COUNT = count, _EXTRA = extra)
EndElse
Return, arr
END
Thanks,
Ben
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