[v3] c++0x common_type patch

[Paolo Carlini]

Hi Chris,

thanks for the updated patch. The __typeof__ workaround makes me really nervous, I don't think we want to use it in new code, I'm wondering if we should instead wait for 36628 to be dealt with properly...

> I just want to make sure this is intentional and that common_type
> isn't expected to try every permutation of the given types.

this is also interesting. Did you consider raising the issue on comp.lang.c++.moderated?

Paolo.