Revamping associative arrays

[Moritz Warning]

On Sat, 17 Oct 2009 18:58:08 +0000, BCS wrote:

> Hello Chris Nicholson-Sauls,
> 
>> Andrei Alexandrescu wrote:
>> 
>>> Associative arrays are today quite problematic because they don't
>>> offer any true iteration. Furthermore, the .keys and .values
>>> properties create new arrays, which is wasteful.
>>> 
>>> Another issue with associative arrays is that ++a[k] is hacked, which
>>> reflects a grave language limitation. That needs to be replaced with a
>>> true facility.
>>> 
>>> Any other issues with AAs that you want to see fixed, and ideas
>>> guiding a redesign?
>>> 
>>> Thanks,
>>> 
>>> Andrei
>>> 
>> Idea: the .keys and .values properties, rather than creating arrays,
>> could create iterable ranges with the smallest possible footprint,
>> internally walking the tree structure.
>> 
>> 
> what will this do?
> 
> foreach(key; aa.keys)
>    if(Test(key))
>       aa.remove(key);

It's undefined behavior.
You shouldn't try to mutate the aa while iterating.
I hope that will be fixed.
It took me some time to find this out.