hashtable local iterator

[Paolo Carlini]

Hi,
> I saw your feedback regarding usage of tuple, do you prefer a solution 
> based on it ? Note that even if it works it will imply inclusion of 
> tuple header each time unordered containers are used, is it ok ? I 
> know Paolo is rather sensible on this subject :-)
I guess nobody likes including redundant stuff. But we have the annoying 
issue with final types: were you handling those correctly with your 
ad-hoc solution?

Paolo.