Class App

example/polymorphism/variant.cpp:28–38

< >*/

/*<<Variant>>*/
class App {
 public:
  explicit App(const Drawable drawable) : drawable{drawable} {}

  void draw(std::ostream& out) const {
    std::visit([&out](const auto& drawable) { drawable.draw(out); }, drawable);
  }

 private:
  const Drawable drawable;
};

int main() {
  std::stringstream str{};