GC-less Hash-Tables (AA)

["Nordlöw" via Digitalmars-d-learn]

On Wednesday, 17 September 2014 at 19:39:16 UTC, Nordlöw wrote:
> On Wednesday, 17 September 2014 at 15:27:40 UTC, Justin Whear 
> wrote:
>> These containers are all certified GC-free.

What'a the cost of using hashset in favour of hashmap if I want 
the to use the

     Range range()

property?