https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91788

--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #2)
> I think we can do that more generically. Does this look right?

lgtm

> (The downside would be that many more functions might need to be
> friends to access _M_index).

You can always make in public instead, or give it a public accessor...

(not commenting on the rest, I haven't studied the implementation enough)

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