[Bug libstdc++/103013] Underconstrained constructor span(_Range&&)

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103013

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-11-01
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu.org
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to TC from comment #4)
> I don't think this needs an extra constraint, just reordering the existing
> ones to check not-a-span (14.3, "remove_­cvref_­t<R> is not a specialization
> of span") first.

Good point - we should do that just because it's cheaper to evaluate the
!is_span check before we waste time determining if it's a contiguous range.