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Author SHA1 Message Date
Joe Loser d2baefae68
[libc++] Replace _LIBCPP_HAS_NO_CONCEPTS with _LIBCPP_STD_VER > 17. NFCI. 
All supported compilers that support C++20 now support concepts. So, remove
`_LIB_LIBCPP_HAS_NO_CONCEPTS` in favor of `_LIBCPP_STD_VER > 17`. Similarly in
the tests, remove `// UNSUPPORTED: libcpp-no-concepts`.

Differential Revision: https://reviews.llvm.org/D121528
 2022-03-13 12:32:06 -04:00
Arthur O'Dwyer d4853e638b [libc++] [ranges] Permit std::mergeable and std::sortable with HAS_NO_INCOMPLETE_RANGES. 
This follows the general direction of D118736 that
`_LIBCPP_HAS_NO_INCOMPLETE_RANGES` does *not* guard anything outside
of the `std::ranges::` namespace itself. This means we must permit
`ranges::less` etc. in no-ranges mode; that seems fine to me.

Differential Revision: https://reviews.llvm.org/D120139
 2022-02-28 14:56:01 -05:00
Konstantin Varlamov eea3d90af1 [libc++][ranges] Implement `std::mergeable`. 
Differential Revision: https://reviews.llvm.org/D119489
 2022-02-17 20:12:04 -08:00