tree bd34f7168ef0c2c2f97563e53c5edb6d99c79de2
parent 3e9af5ac6ac84cde4eee6234dbaad6990733be07
author Eric Fiselier <eric@efcs.ca> 1564808494 +0000
committer Eric Fiselier <eric@efcs.ca> 1564808494 +0000

Simplify <type_traits> implementations.

This patch rewrites a number of old meta-function implementations
that assumed const/volatile could not be safely applied to all types.
This is no longer the case, though for some types (Ex function types),
the const qualifier can be ignored.

The largest improvement in this patch is the reduction of is_function.
Thanks to Matt Calabrese for the improved implementation.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@367749 91177308-0d34-0410-b5e6-96231b3b80d8