unordered map design modification

[Paolo Carlini]

On 10/25/2012 10:15 PM, François Dumont wrote:
> Here is the patch to apply the same modification applied to 
> unordered_set and unordered_multiset. It also use default 
> implementation for unordered_set/unordered_multiset copy/move 
> constructor/assignment operators.
Looks good to me, thanks! Before committing, please double check the 
various comments vs the various observations Jon sent over the last time.

Thanks again,
Paolo.