P0920 Precalculated hash values in lookup

[jensmaurer]

P0920R1 Precalculated hash values in lookup (Mateusz Pusz)

https://issues.isocpp.org/show_bug.cgi?id=505

[mclow]

LWG reviewed on Friday. Approved for vote in Plenary.

[jensmaurer]

Approved by plenary in Kona; see cplusplus/draft#2709.

[wg21bot]

P0920R2 Precalculated hash values in lookup (Mateusz Pusz)

[wg21bot]

Adopted 2019-03.