[Patch] Use variadic templates for tr1::is_function

[Paolo Carlini]

Paolo Carlini wrote:

> Hi all, hi Doug,
>
> I'm finishing regtesting the below, which I consider better than 
> instantiating a lot of templates for a single trait and/or using 
> something like the old __in_array. Do you agree?

In any case, better this way, otherwise we run into problems with member 
functions.

Paolo.

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