commit be01eadd017c49709b23c0f10decb3356a6767f4
author Arthur O'Dwyer <arthur.j.odwyer@gmail.com> Fri Jan 21 15:51:46 2022 -0500
committer Copybara-Service <copybara-worker@google.com> Mon Jan 31 09:25:51 2022 -0800
tree f765ef4d8423efacee5881c2768cfbb2e5b9365a
parent e351c695a0f963ee841f0d8bab9e63b41488be74

[libc++] [ranges] Implement std::ranges::distance

This includes an experimental workaround for
LWG3664 "LWG3392 broke std::ranges::distance(a, a+3)",
but the workaround may be incomplete, I'm not sure.
This should be re-audited when LWG3664 is actually adopted,
to see if we need to change anything about our implementation.

See also https://github.com/microsoft/STL/pull/2500

Differential Revision: https://reviews.llvm.org/D117940

GitOrigin-RevId: c965d5448ecdf9a5513983862a78a2ba8f7fbab8