Why D const is annoying

[Timon Gehr]

On 12/10/2011 12:08 PM, bearophile wrote:
> Timon Gehr:
>
>> No, popFront is mutating and const(int[]) cannot be mutated.
>
> So, is it impossible by design to iterate immutable collections?
>

No, it is impossible to popFront an immutable array. Because it is, 
well, immutable. But you can always slice it and get a range back that 
can be used to iterate the array (btw thanks to the devs for fixing 
that, that did not work a few releases ago!).

Library defined immutable collection types can/should use the same pattern.