std::identity

[David Krauss]

There are many uses for std::identity besides as a helper for
std::move. I'm surprised just now to see that it was removed between
N3035 and the FCD.

Can it be moved to <utility>? I imagine there's already a fair amount
of C++0x code out there which depends on it, and likely the popular
implementations haven't yet removed it so the impact is yet unknown.

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[Johannes Schaub (litb)]

David Krauss wrote:

> There are many uses for std::identity besides as a helper for
> std::move. I'm surprised just now to see that it was removed between
> N3035 and the FCD.
>
> Can it be moved to <utility>? I imagine there's already a fair amount
> of C++0x code out there which depends on it, and likely the popular
> implementations haven't yet removed it so the impact is yet unknown.
>

I would also vote to bring it back, if it's really removed. It's one of the
most basic *and* (imho) useful metafunction and it's missing? That would be
odd.

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