AA.remove in foreach && AA = new vs cleaning

Saaa empty at needmail.com
Wed Oct 21 22:08:50 PDT 2009

Steven Schveighoffer wrote

>> But I've changed everything to `new` the array afterwards as I deleted 
>> all  the
>> keys anyways.
> Not sure what you mean here.

foreach (K k, ; aa)
aa = new int[char];

>>> I have gotten around this in dcollections by removing elements outside 
>>> the
>>> loop body.  See for example the keypurge function of HashMap
>>> (http://www.dsource.org/projects/dcollections/docs/current/dcollections.HashMap.html)
>> Do you add the ones to be deleted to a dynamic array or do you loop
>> over all elements afterwards? I expect the first :)
> I delete them as they are requested to be deleted.  Since the deletion is 
> done by the opApply function, it has knowledge of when it is ok to delete 
> the element, and can save off any necessary structural information needed 
> to get to the next element.
How is this `outside the loop body`?
Should I read it as `after the loop body`?

> It makes for an efficient method to traverse and remove in one pass.
> -Steve 

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