[PATCH 2/3] libstdc++: elements_view's sentinel and iterator not comparable [LWG 3406]

[Jonathan Wakely]

On 26/08/20 16:44 -0400, Patrick Palka via Libstdc++ wrote:
>This implements the proposed resolution for LWG 3406 and adds a testcase
>for the example from P1994R1.
>
>libstdc++-v3/ChangeLog:
>
>	LWG 3406
>	* include/std/ranges (elements_view::begin): Adjust constraints.
>	(elements_view::end): Likewise.
>	(elements_view::_Sentinel::operator==): Templatize to take both
>	_Iterator<true> and _Iterator<false>.
>	(elements_view::_Sentinel::operator-): Likewise.
>	* testsuite/std/ranges/adaptors/elements.cc: Add testcase for
>	the example from P1994R1.
>	* testsuite/std/range/adaptors/lwg3406.cc: New test.

OK, thanks.