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>
#include <string>
int main()
{
Variant<int, double, std::string> field(17);
if (field.is<int>()) {
std::cout << "Field stores the integer " << field.get<int>()
<< std::endl;
}
field = 42; // assign value of same type
field = "hello"; // assign value of different type
std::cout << "Field now stores the string \""
<< field.get<std::string>() << '\"' << std::endl;
}