Is removing elements of AA in foreach loop safe?

[Jordan Wilson]

On Thursday, 29 August 2019 at 10:11:58 UTC, berni wrote:
> Iterating of some structure and removing elements thereby is 
> always errorprone and should be avoided. But: In case of AA, 
> I've got the feeling, that it might be safe:
>
>> foreach (k,v;ways)
>>     if (v.empty)
>>         ways.remove(k);
>
> Do you agree? Or is there a better way to achieve this?

This should work, due to the keys property returning a dynamic 
array:

foreach (k; ways.keys) {
     if (ways[k].empty)
         ways.remove(k);
}

Jordan