I have seen the following in a abook:

"The argument(s) of a method can be any type of object (as long as its class has been made available to the program), as well as the predeļ¬ned default types of variable. For example, methods in our three-vector class are not limited to just accepting arguments of type threevector, int, double, etc."

I understand that the first statement is telling us that objects of all classes made available to the program can be used as arguments of a method.

What I do not understand, however, is how the second statement follows logically from the first. "Methods in our three-vector class are not limited to just accepting arguments of type threevector, int, double, etc." Sure! No problem! But what other types of objects are you thinking of?

any data type that you can think of.
User defined types, char, unsigned, etc., anything.....