Jonathan Wakely adec148117 libstdc++: Constrain three-way comparison for std::optional [PR 98842] ... The operator<=>(const optional<T>&, const U&) operator is supposed to be constrained with three_way_comparable_with<U, T> so that it can only be used when T and U are weakly-equality-comparable and also three-way comparable. Adding that constrain completely breaks std::optional comparisons, because it causes constraint recursion. To avoid that, an additional check that U is not a specialization of std::optional is needed. That appears to be a defect in the standard and should be reported to LWG. Signed-off-by: Jonathan Wakely <jwakely@redhat.com> libstdc++-v3/ChangeLog: PR libstdc++/98842 * include/std/optional (operator<=>(const optional<T>& const U&)): Add missing constraint and add workaround for template recursion. * testsuite/20_util/optional/relops/three_way.cc: Check that type without equality comparison cannot be compared when wrapped in std::optional.		2021-06-07 15:45:14 +01:00
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1.cc	libstdc++: Remove redundant -std=gnu++17 option from any/optional/variant tests	2021-05-10 16:22:53 +01:00
2.cc	libstdc++: Remove redundant -std=gnu++17 option from any/optional/variant tests	2021-05-10 16:22:53 +01:00
3.cc	libstdc++: Remove redundant -std=gnu++17 option from any/optional/variant tests	2021-05-10 16:22:53 +01:00
4.cc	libstdc++: Remove redundant -std=gnu++17 option from any/optional/variant tests	2021-05-10 16:22:53 +01:00
5.cc	libstdc++: Remove redundant -std=gnu++17 option from any/optional/variant tests	2021-05-10 16:22:53 +01:00
6.cc	libstdc++: Remove redundant -std=gnu++17 option from any/optional/variant tests	2021-05-10 16:22:53 +01:00
7.cc	libstdc++: Remove redundant -std=gnu++17 option from any/optional/variant tests	2021-05-10 16:22:53 +01:00
96269.cc	Update copyright years.	2021-01-04 10:26:59 +01:00
three_way.cc	libstdc++: Constrain three-way comparison for std::optional [PR 98842]	2021-06-07 15:45:14 +01:00