[libc++][NFCI] span: replace enable_if with concepts
authorJoe Loser <joeloser93@gmail.com>
Wed, 15 Jun 2022 03:25:50 +0000 (21:25 -0600)
committerJoe Loser <joeloser93@gmail.com>
Wed, 15 Jun 2022 03:25:50 +0000 (21:25 -0600)
commitcb48ed38b8d09ef9cfa1f7258342d0379f169074
tree2b019588b45d1996ff62f78886cea0fba549c901
parentab7fcf24849d9365785dc981613e761e388e560d
[libc++][NFCI] span: replace enable_if with concepts

Several span constructors use `enable_if` which is verbose. Replace these with
concepts or requires expressions.
libcxx/include/span