There are a handful of standard library types that are intended
to support CTAD but don't need any explicit deduction guides to
do so.
This patch adds a dummy deduction guide to those types to suppress
-Wctad-maybe-unsupported (which gets emitted in user code).
This is a re-application of the original patch by Eric Fiselier in
fcd549a7d8 which had been reverted due to reasons lost at this point.
I also added the macro to a few more types. Reviving this patch was
prompted by the discussion on https://llvm.org/D133425.
Differential Revision: https://reviews.llvm.org/D133535
This implements the Grapheme clustering as required by
P1868R2 width: clarifying units of width and precision in std::format
This was omitted in the initial patch, but the paper was marked as completed. This really completes the paper.
Reviewed By: ldionne, #libc
Differential Revision: https://reviews.llvm.org/D126971
Louis Dionne