Hristo Hristov a0c00ccd5f [libc++] P2944R3: Constrained comparisons - update reference_wrapper implementation (#139368) ...

Updates the implementation `std::reference_wrapper` -
[P2944R3](https://wg21.link/P2944R3) as discussed in
https://github.com/llvm/llvm-project/pull/117664#discussion_r1857826166
This PR also refactors the tests in preparation to implements the
constrained comparisons for `optional`, `variant` etc.

- Moves the test helpers (concepts and types) for testing constrained
comparisons to `test_comparisons.h`.
- Updates the `std::reference_wrapper` implementation to use the concept
`__core_convertible_to<bool>` as per comments in #135759.

Closes #138233

# References:
- [refwrap.comparisons](https://wg21.link/refwrap.comparisons)

---------

Co-authored-by: Hristo Hristov <zingam@outlook.com>
Co-authored-by: Nikolas Klauser <nikolasklauser@berlin.de>

2025-06-15 07:45:48 +03:00

..

binary_function.h

[libc++] Remove _LIBCPP_TEMPLATE_VIS (#134885)

2025-04-09 23:47:57 +02:00

binary_negate.h

[libc++] Remove _LIBCPP_TEMPLATE_VIS (#134885)

2025-04-09 23:47:57 +02:00

bind_back.h

…

bind_front.h

…

bind.h

[libc++] Add [[gnu::nodebug]] on type traits (#128502)

2025-03-23 21:01:25 +01:00

binder1st.h

[libc++] Remove _LIBCPP_TEMPLATE_VIS (#134885)

2025-04-09 23:47:57 +02:00

binder2nd.h

[libc++] Remove _LIBCPP_TEMPLATE_VIS (#134885)

2025-04-09 23:47:57 +02:00

boyer_moore_searcher.h

[libc++] Remove _LIBCPP_TEMPLATE_VIS (#134885)

2025-04-09 23:47:57 +02:00

compose.h

…

default_searcher.h

[libc++] Remove _LIBCPP_TEMPLATE_VIS (#134885)

2025-04-09 23:47:57 +02:00

function.h

[libc++] Remove allocator support from std::function (#140395)

2025-06-12 14:21:29 +02:00

hash.h

[libc++] Simplify the implementation of std::hash (#140407)

2025-06-10 06:32:56 +02:00

identity.h

…

invoke.h

…

is_transparent.h

[libc++] implement std::flat_multimap (#113835)

2025-01-25 18:30:00 +00:00

mem_fn.h

[libc++] Define an internal API for std::invoke and friends (#116637)

2025-01-20 18:00:15 +01:00

mem_fun_ref.h

[libc++] Remove _LIBCPP_TEMPLATE_VIS (#134885)

2025-04-09 23:47:57 +02:00

not_fn.h

[libc++] Implement std::not_fn<NTTP> (#86133)

2025-01-10 14:14:14 -05:00

operations.h

[libc++] Remove _LIBCPP_TEMPLATE_VIS (#134885)

2025-04-09 23:47:57 +02:00

perfect_forward.h

[libc++] Put _LIBCPP_NODEBUG on all internal aliases (#118710)

2025-01-08 11:12:59 -05:00

pointer_to_binary_function.h

[libc++] Remove _LIBCPP_TEMPLATE_VIS (#134885)

2025-04-09 23:47:57 +02:00

pointer_to_unary_function.h

[libc++] Remove _LIBCPP_TEMPLATE_VIS (#134885)

2025-04-09 23:47:57 +02:00

ranges_operations.h

…

reference_wrapper.h

[libc++] P2944R3: Constrained comparisons - update reference_wrapper implementation (#139368)

2025-06-15 07:45:48 +03:00

unary_function.h

[libc++] Remove _LIBCPP_TEMPLATE_VIS (#134885)

2025-04-09 23:47:57 +02:00

unary_negate.h

[libc++] Remove _LIBCPP_TEMPLATE_VIS (#134885)

2025-04-09 23:47:57 +02:00

weak_result_type.h

[libc++] Improve deprecated diagnostic guards.

2025-03-18 18:30:48 +01:00