a0c00ccd5f
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>
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