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[libc++][ranges] P2609R3: Relaxing Ranges Just A Smidge (#101715 )

This patch implements https://wg21.link/p2609r3.
The test code was originally authored by JMazurkiewicz.

Notes:
- P2609R3 is not officially a Defect Report, but MSVC STL
  implements it in C++20 mode.

  Moreover, P2609R3 and P2997R1 touch exactly the same set of
  concepts, and MSVC STL and libc++ have already treated P2997R1
  as a DR.

- This patch also adjusted feature-test macros.
  + In C++20 mode, the value of __cpp_lib_ranges should be `202110L` because
    - `202202L` covers `range_adaptor_closure` (P2387R3), and
    - `202207L` covers move-only types in range adaptors (P2494R2).
  And all of these changes are only available since C++23 mode.

  + In C++23 mode, the value should be `202406L` because
    - `202211L` covers removing poison overloads (P2602R2),
    - `202302L` covers relaxing projected value types (P2609R3), and
    - `202406L` covers removing requirements on `iter_common_reference_t` (P2997R1).
  And all of these changes are already or being implemented.

Fixes #105253.

Co-authored-by: Jakub Mazurkiewicz <mazkuba3@gmail.com>

2024-08-28 08:55:44 -04:00

benchmarks

[libc++] Optimize lexicographical_compare (#65279 )

2024-08-04 10:02:43 +02:00

configs

[libc++] Allow testing Apple's system library as it is installed (#99086 )

2024-07-18 16:49:07 -04:00

libcxx

[libc++] Disallow character types being index types of extents (#105832 )

2024-08-27 16:41:55 -04:00

std

[libc++][ranges] P2609R3: Relaxing Ranges Just A Smidge (#101715 )