Function main

example/example_switch.cpp:45–107

template <typename... Ts> overloaded(Ts...) -> overloaded<Ts...>;

int main() {
  Color c = Color::RED;

  auto lambda = [] (auto value) {
    std::cout << DoWork<value>() << std::endl;
  };

  magic_enum::enum_switch(lambda, c); // prints "default"

  c = Color::GREEN;

  magic_enum::enum_switch(lambda, c); // prints "override"

  // with object, explicit enum type
  auto switcher1 = overloaded{
    [] (magic_enum::enum_constant<Color::BLUE>) {
      std::cout << "Blue" << std::endl;
    },
    [] (magic_enum::enum_constant<Color::RED>) {
      std::cout << "Red" << std::endl;
    }
  };

  magic_enum::enum_switch(switcher1, Color::GREEN); // prints nothing
  magic_enum::enum_switch(switcher1, Color::BLUE); // prints "Blue"
  magic_enum::enum_switch(switcher1, Color::RED); // prints "Red"

  // explicit result type
  auto switcher2 = overloaded{
    [] (magic_enum::enum_constant<Color::GREEN>) {
      return "called with green argument";
    },
    [] (Color other) { // default case
      auto name = magic_enum::enum_name(other); // not empty
      return "default: " + std::string{name};
    }
  };

  std::cout << magic_enum::enum_switch<std::string>(switcher2, Color::GREEN) << std::endl; // prints "called with green argument"
  std::cout << magic_enum::enum_switch<std::string>(switcher2, Color::RED) << std::endl; // prints "default: RED"

  auto empty = magic_enum::enum_switch<std::string>(switcher2, static_cast<Color>(-3)); // returns an empty string
  assert(empty.empty());

  // result with default object
  std::cout << magic_enum::enum_switch<std::string>(switcher2, static_cast<Color>(-3), "unrecognized") << std::endl; // prints "unrecognized"

  auto switcher3 = overloaded{
    [] (magic_enum::enum_constant<Color::RED>) -> std::optional<std::string> {
      return "red result";
    },
    [] (magic_enum::enum_constant<Color::BLUE>) -> std::optional<std::string> {
      return std::nullopt;
    }
  };

  std::cout << std::boolalpha;
  std::cout << magic_enum::enum_switch(switcher3, Color::GREEN, std::make_optional("cica")).value() << std::endl; // prints default: "cica"