Something

#include <string>#include <iostream>using namespace std;void foo(string s = "Hi") {        s.append("...");        cout << s << endl;}int main() {        foo();        foo();        foo("Yo");        foo();        return 0;}/*  Assignment on each call (no reusing default values)Hi...Hi...Yo...Hi...*//* Vs...>>> def foo(a, L=[]):...     L.append(a)...     print L...>>> foo(1)[1]>>> foo(2)[1, 2]>>> foo(3, ['yo'])['yo', 3]>>> foo(4)[1, 2, 4]>>>*/