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[PATCH] PR libstdc++/83134 Ensure std::__not_ converts B::value to bool

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: Thu, 23 Nov 2017 21:38:58 +0000
Subject: [PATCH] PR libstdc++/83134 Ensure std::__not_ converts B::value to bool
Authentication-results: sourceware.org; auth=none

Agustín reported this bug in std::negation, so we need to fix our
underlying __not_<> template to meet the C++17 requirements for
std::negation.

	PR libstdc++/83134
	* include/std/type_traits (__not_): Explicitly convert to bool.
	* testsuite/20_util/declval/requirements/1_neg.cc: Adjust dg-error.
	* testsuite/20_util/logical_traits/83134.cc: New test.
	* testsuite/20_util/make_signed/requirements/typedefs_neg.cc: Adjust
	dg-error.
	* testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc:
	Likewise.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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