Question

I think it is because of the code I wrote below. But I couldn’t solve it.

classname::smt() {;}

classname::smt1(int x, double y, string name)
{
    x = xprivate;
    y = yprivate;
    name = nameprivate;
}

Answer 1

It means you can’t have code that does this:

class classname
{
    classname() const
    classname() volatile
    classname() const volatile
};

cv-qualifers apply to storage and to methods, not to constructors or destructors (because you still have to initialize cv-qualified storage).