The following code example is taken from the book
C++20 - The Complete Guide
by Nicolai M. Josuttis,
Leanpub, 2021
The code is licensed under a
Creative Commons Attribution 4.0 International License.
// raw code
#include "valorcoll.hpp"
#include <vector>
int main()
{
ValOrColl o1 = 42;
o1.print();
ValOrColl o2 = std::vector{1, 2, 3, 4};
o2.print();
}