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[PATCH] P0340R2 Making std::underlying_type SFINAE-friendly

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Sat, 23 Feb 2019 21:22:50 +0000
Subject: [PATCH] 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.

This was just approved in Kona.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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