[Patch] libstdc++/31426 & C++0x type_traits

[Paolo Carlini]

Benjamin Kosnik wrote:

>> By the way, if you are willing to implement the C++0x behavior for 
>> is_signed / is_unsigned, just let me know.
>
> I'm in the middle of other work. Since it seems like you've already 
> got a draft implementation, go with it and do whatever fixups you need 
> to do.

Ok, agreed. I'm thinking that probably I will quickly hack something as 
part of the big patch. I'm finishing testing, will post and commit later 
today...

Paolo.