r269168 - in /trunk/libstdc++-v3: ChangeLog inc...

Sat Feb 23 21:19:00 GMT 2019

Author: redi
Date: Sat Feb 23 21:19:00 2019
New Revision: 269168

URL: https://gcc.gnu.org/viewcvs?rev=269168&root=gcc&view=rev
Log:
P0340R2 Making std::underlying_type SFINAE-friendly

	* include/std/type_traits (__underlying_type_impl): New helper to
	make underlying_type SFINAE-friendly.
	(underlying_type): Derive from __underlying_type_impl.
	* testsuite/20_util/underlying_type/requirements/typedefs-3.cc: New
	test.

Added:
    trunk/libstdc++-v3/testsuite/20_util/underlying_type/requirements/typedefs-3.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/std/type_traits