Is removing elements of AA in foreach loop safe?

[Ferhat Kurtulmuş]

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?

I know, it is foreach loop in question. How about using a reverse 
for loop like:

for (size_t i = arr.length ; i-- > 0 ; ){
     arr.remove(i);
}