12 Overloading [over]

12.2 Overload resolution [over.match]

12.2.4 Best viable function [over.match.best]

12.2.4.2 Implicit conversion sequences [over.best.ics]

12.2.4.2.4 Ellipsis conversion sequences [over.ics.ellipsis]

An ellipsis conversion sequence occurs when an argument in a function call is matched with the ellipsis parameter specification of the function called (see [expr.call]).