13 Overloading [over]

13.3 Overload resolution [over.match]

13.3.1 Candidate functions and argument lists [over.match.funcs] Initialization by constructor [over.match.ctor]

When objects of class type are direct-initialized ([dcl.init]), or copy-initialized from an expression of the same or a derived class type ([dcl.init]), overload resolution selects the constructor. For direct-initialization, the candidate functions are all the constructors of the class of the object being initialized. For copy-initialization, the candidate functions are all the converting constructors ([class.conv.ctor]) of that class. The argument list is the expression-list or assignment-expression of the initializer.