sx/examples/0102-types-union.sx

#import "modules/std.sx";

Shape :: enum {
    circle: f32;
    rect: struct { w, h: f32;};
    none;
}

main :: () {
    // Construction with .variant(payload)
    s :Shape = .circle(3.14);
    print("circle: {}\n", s);

    // Payload access
    r := s.circle;
    print("radius: {}\n", r);

    // Void variant via enum literal
    s = .none;
    print("none: {}\n", s);

    // Reassign with payload
    s = .rect(.{4, 2});
    print("rect: {}\n", s);

    // Explicit prefix construction
    sh :Shape = Shape.circle(2.71);
    print("sh: {}\n", sh);

    // Field access on second variable
    sh2 :Shape = .rect(.{2,4});
    val := sh2.rect;
    print("rect val: {}\n", val);

    // Match on enum
    if sh2 == {
        case .circle: print("matched circle\n");
        case .rect: print("matched rect\n");
        case .none: print("matched none\n");
    }

    cs := if sh2 == {
        case .circle: 1;
        case .rect: 2;
        case .none: 3;
    }
    print("case : {}", cs);
}