Destructuring-Enums.cpp

#include "matchit.h"
#include <iostream>
#include <optional>
#include <stack>

struct Quit
{
};
using Move = std::array<int32_t, 2>;
using Write = std::string;
using ChangeColor = std::array<int32_t, 3>;
using Message = std::variant<Quit, Move, Write, ChangeColor>;

int32_t main()
{
  Message const msg = ChangeColor{0, 160, 255};

  using namespace matchit;
  Id<int32_t> x, y;
  Id<std::string> text;
  Id<int32_t> r, g, b;
  match(msg)(
      pattern | as<Quit>(_) =
          []
      {
        std::cout << "The Quit variant has no data to destructure."
                  << std::endl;
      },
      pattern | as<Move>(ds(x, y)) =
          [&]
      {
        std::cout << "Move in the x direction " << *x
                  << " and in the y direction " << *y << std::endl;
      },
      pattern | as<Write>(text) =
          [&]
      { std::cout << "Text message: " << *text << std::endl; },
      pattern | as<ChangeColor>(ds(r, g, b)) =
          [&]
      {
        std::cout << "Change the color to red " << *r << ", green " << *g
                  << ", and blue " << *b << std::endl;
      });
}