A. Jiang dd8767b101
[libc++][test] Clean-up MinSequenceContainer (#158432)
Follows-up #158344.

- Guard range-related functions with `TEST_STD_VER >= 23`.
- Mark range-related functions unconditionally `constexpr`.
- Add `TEST_CONSTEXPR_CXX20` to one `operator=`.

This will make `MinSequenceContainer` more consistent and useful for
legacy container adaptors or C++26 `constexpr` additions. Although we're
currently only using it with flat container adaptors.
2025-09-15 08:43:41 -04:00
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