copy constructor with default arguments

Question

As far as I know, the copy constructor must be of the form T(const T&) or T(T&). What if I wanted to add default arguments to the signature

Answer 1

Yes.

§[class.copy]/2:

A non-template constructor for class X is a copy constructor if its first parameter is of type X&, const X&, volatile X& or const volatile X&, and either there are no other parameters or else all other parameters have default arguments [ Example: X::X(const X&) and X::X(X&,int=1) are copy constructors.