lst-0015-godb.cpp
//#(compile) c++; compiler:g141; options:; libs:-
// https://godbolt.org/z/Ec7vqEdY3
//… Base2 and Value2 as before …
void output(Base2 x) { // pass by value
x.print(cout);
}
int main() {
Base2 ba2{}; output(ba2); // outputs 8
Value2 va2{}; output(va2); // also outputs 8
}