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 "variant-all.hpp"
#include <iostream>
int main()
{
Variant<int, double> v;
if (v.is<int>()) {
std::cout << "Default-constructed v stores the int "
<< v.get<int>() << '\n';
}
Variant<double, int> v2;
if (v2.is<double>()) {
std::cout << "Default-constructed v2 stores the double "
<< v2.get<double>() << '\n';
}
}