The following code example is taken from the book
Object-Oriented Programming in C++
by Nicolai M. Josuttis, Wiley, 2002
© Copyright Nicolai M. Josuttis 2002
#include <iostream>
#include <string>
#include "max1.hpp"
int main()
{
int a, b; // two variables of the datatype int
std::string s, t; // two variables of the type std::string
//...
std::cout << max(a,b) << std::endl; // max() for two ints
std::cout << ::max(s,t) << std::endl; // max() for two strings
}