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[PATCH] Constrain std::variant constructor for class template argument deduction

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: Fri, 14 Jul 2017 20:19:17 +0100
Subject: [PATCH] Constrain std::variant constructor for class template argument deduction
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This patch from Jason solves the problem pointed out at the end of
D0702R1 (not public yet):

std::variant<int, double> v1(3);
std::variant v2 = v1;

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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