r250213 - in /trunk/libstdc++-v3: ChangeLog inc...

[redi@gcc.gnu.org]

Author: redi
Date: Fri Jul 14 19:13:49 2017
New Revision: 250213

URL: https://gcc.gnu.org/viewcvs?rev=250213&root=gcc&view=rev
Log:
Constrain std::variant constructor for class template argument deduction

2017-07-14  Jason Merrill  <jason@redhat.com>
	    Jonathan Wakely  <jwakely@redhat.com>

	* include/std/variant (variant::variant(_Tp&&)): Constrain to remove
	the constructor for empty variants from the candidate functions
	during class template argument deduction.
	* testsuite/20_util/variant/deduction.cc: New.

Added:
    trunk/libstdc++-v3/testsuite/20_util/variant/deduction.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/std/variant