The following code example is taken from the book
C++ Templates - The Complete Guide, 2nd Edition
by David Vandevoorde, Nicolai M. Josuttis, and Douglas Gregor,
Addison-Wesley, 2017
© Copyright David Vandevoorde, Nicolai M. Josuttis, Douglas Gregor 2017
#include <iostream>
template<auto T> // take value of any possible nontype parameter (since C++17)
class Message {
public:
void print() {
std::cout << T << '\n';
}
};
int main()
{
Message<42> msg1;
msg1.print(); // initialize with int 42 and print that value
static char const s[] = "hello";
Message<s> msg2; // initialize with char~const[6] "hello"
msg2.print(); // and print that value
}