[patch] : Improve std::search on v7

[Chris Jefferson]

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Paolo Carlini wrote:
> 
> As I said, there is no point in working out those details, because we
> don't know how to deal with unions. 

(sorry about my last e-mail... not sure how it got half-eaten..)

I haven't thought about unions in a very long time. I'm going to have a
look now. I can see now how EBO can go wrong, and also how to fix it
(same as vector already does). Thank you!

I can tell you how I'd like to deal with unions, which is by dispatching
based on tr1::is_union<_Comp> ;) However, until that comes along, it
might be necessary to come up with a temporary solution.

Out of interest, why isn't this union business also a problem for
allocators on the standard containers? Are they just not allowed to be
unions?

Chris
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