[libcxx-commits] [PATCH] D109212: [libc++] span: replace enable_if with requires. NFCI.

[Joe Loser via Phabricator via libcxx-commits]

jloser created this revision.
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Several span constructors use `enable_if_t` which is verbose and slow.
Replace these `enable_if_t` clauses with their equivalent using
`requires` clauses.

Note: some constraints on various `span` constructors are wrong and will
be fixed in follow-up patches.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D109212

Files:
  libcxx/include/span

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