tree ac4a6fe0d4690c83507eb79c4d21f6b054d169d5
parent e46f68502a4ec296a20936e0017ae6ad35ea9a6a
author Zhihao Yuan <zy@miator.net> 1561068580 +0000
committer Zhihao Yuan <zy@miator.net> 1561068580 +0000

[libc++] Recommit r363692 to implement P0608R3

Re-apply the change which was reverted in r363764 as-is after
breakages being resolved.  Thanks Eric Fiselier for working
hard on this.

See also: https://bugs.llvm.org/show_bug.cgi?id=42330

Differential Revision: https://reviews.llvm.org/D44865


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@363993 91177308-0d34-0410-b5e6-96231b3b80d8