Vote on region allocator

[dsimcha]

On 9/24/2011 7:55 PM, Andrei Alexandrescu wrote:
> Defining and using an allocator interface would have a small speed
> impact (i.e. allocation would entail an indirect call) but I think that
> would be acceptable.

Agreed.  My much bigger concern w.r.t. dynamic interfaces is their 
inflexibility, i.e. that they can't be used effectively with template 
metaprogramming.