Nikolas Klauser 33de5a316c [libc++] Rename __fwd/hash.h to __fwd/functional.h and add reference_wrapper (#81445) ...

We forward declare `reference_wrapper` in multiple places already. This
moves the declaration to the canonical place and removes unnecessary
includes of `__functional/reference_wrapper.h`.

2024-03-03 20:45:17 +01:00

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