[libcxx-commits] [libcxx] [libc++] Create a `constexpr` hash to use during constant evaluation (PR #214946)

[A. Jiang via libcxx-commits]

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frederick-vs-ja wrote:

This seems correct. There's no standard hasher having (guaranteed) `constexpr` `operator()` in C++26.

`constexpr` additions to unordered associative containers only affect user-provided hashers.

https://github.com/llvm/llvm-project/pull/214946