Overloading two different type functions with default arguments

Question

I was doing an assignment and encountered a problem really similar to this: a-confusion-about-c-function-overloading

I understand why it is ambigious, but I wonder if there is a way to make it work if overloaded function returns different type, i.e.:

int foo (int a=0);
double foo (double a=1);

and to make this work:

double x=foo();