The following code example is taken from the book
C++ Templates - The Complete Guide
by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002
© Copyright David Vandevoorde and Nicolai M. Josuttis 2002
#include <iostream>
#include "sqrt2.hpp"
int main()
{
std::cout << "Sqrt<16>::result = " << Sqrt<16>::result
<< '\n';
std::cout << "Sqrt<25>::result = " << Sqrt<25>::result
<< '\n';
std::cout << "Sqrt<42>::result = " << Sqrt<42>::result
<< '\n';
std::cout << "Sqrt<1>::result = " << Sqrt<1>::result
<< '\n';
}