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Author SHA1 Message Date
Marek Kurdej 0324b46cd8 [libc++] [C++2b] [P2162] Allow inheritance from std::variant. 
This patch changes the variant even in pre-C++2b.
It should not break anything, only allow use cases that didn't work previously.

Notes:
 `__as_variant` is used in `__visitation::__variant::__visit_alt`, but I haven't used it in `__visitation::__variant::__visit_alt_at`.
That's because it is used only in `__visit_value_at`, which in turn is always used on variant specializations (that's in comparison operators).

* https://wg21.link/P2162

Reviewed By: ldionne, #libc, Quuxplusone

Differential Revision: https://reviews.llvm.org/D97394
 2021-03-25 18:20:50 +01:00
Marek Kurdej 43e4214173 [libc++] [C++2b] [P1682] Add to_underlying. 
* https://wg21.link/P1682

Reviewed By: ldionne, Mordante, #libc

Differential Revision: https://reviews.llvm.org/D97365
 2021-03-05 10:31:21 +01:00
Marek Kurdej 11ef785cdd [libc++] [docs] [C++2b] Update status page with issues (and forgotten papers) adopted in November 2020 and February 2021 virtual meetings. 
Sources:
* https://github.com/cplusplus/draft/pull/4380 (November 2020)
* https://github.com/cplusplus/draft/pull/4523 (February 2021)
* https://github.com/cplusplus/draft/issues?q=is%3Aissue+LWG+Motion
 2021-03-01 11:19:18 +01:00
Marek Kurdej 77bd454da3 [libc++] [docs] [C++2b] Update status page with papers adopted in February 2021 virtual meeting. 2021-02-24 09:40:33 +01:00
Mark de Wever 3317b38ef8 [NFC][libc++] Update the implementation status. 
During the review of https://reviews.llvm.org/D93912 we failed to notice
the implementation status wasn't updated. This rectifies the issue.
 2021-01-22 20:24:33 +01:00
Marek Kurdej 1f1250151f [libc++] [C++2b] [P1048] Add is_scoped_enum and is_scoped_enum_v. 
* https://wg21.link/p1048

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm.org/D94409
 2021-01-12 17:08:20 +01:00
Marek Kurdej 590bbfe0d8 [libc++] [docs] Add C++2b (to be C++23) status page. 
Also:
* Fix header line in all status tables.
* Use C++20 instead of C++2a.

Reviewed By: ldionne, #libc, miscco

Differential Revision: https://reviews.llvm.org/D92306
 2020-12-03 09:22:06 +01:00