[patch] Simplify non-inline function definitions for std::unordered_xxx containers

[François Dumont]

On 03/12/2014 16:59, Jonathan Wakely wrote:
> François (or anyone else), do you see any problem with this change?
>
> It makes the code shorter and I think is much easier to read, it also
> reduces the memory total shown by -ftime-report.
>
No, no problem. Interesting to see what benefit we can have when 
reducing number of template parameters. I will try to recall it in the 
future.

François