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[PATCH] PR libstdc++/71187 reimplement declval without add_rvalue_reference

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: Mon, 18 Sep 2017 12:41:24 +0100
Subject: [PATCH] PR libstdc++/71187 reimplement declval without add_rvalue_reference
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This implements Eric Niebler's suggestion of a more lightweight
std::declval, which doesn't need to instantiate
std::add_rvalue_reference (and its base class and helpers).

	PR libstdc++/71187
	* include/std/type_traits (__declval): New function to deduce return
	type of declval.
	(__declval_protector::_delegate): Remove.
	(declval): Use __declval instead of add_rvalue_reference and
	__declval_protector::__delegate.
	* testsuite/20_util/declval/requirements/1_neg.cc: Adjust dg-error
	lineno.
	* testsuite/20_util/make_signed/requirements/typedefs_neg.cc:
	Likewise.
	* 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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