Static polymorphism

static_polymorphism.cpp

#include <mapbox/variant.hpp>

#include <cstdlib>
#include <iostream>

struct A {
  int x = 0;
};

struct B {
  int x = 1;
};

int main(int argc, char const *argv[]) {
  if (argc != 2) {
    return 1;
  }
  int i = std::atoi(argv[1]);

  mapbox::util::variant<A, B> v;
  if (i == 0) {
    v = A();
  } else {
    v = B();
  }

  v.match([](auto value) { std::cout << value.x << std::endl; });

  return 0;
}