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namespace;
include rt;
// tagged enums: a member can carry fields, a constructor builds it, and a
// switch matches on the member and binds its fields
enum shape { circle { int r; }, rect { int w; int h; }, dot };
fn area(shape* s) {
switch (s) {
case circle(r): return r * r * 3;
case rect(w, h): return w * h;
case dot: return 0;
}
return -1;
}
fn main() {
shape* a = shape.circle(3);
shape* b = shape.rect(4, 5);
shape* c = shape.dot();
rt.put_n(area(a)); rt.put_c(32);
rt.put_n(area(b)); rt.put_c(32);
rt.put_n(area(c)); rt.put_c(32);
rt.put_n(a.tag); rt.put_c(32);
rt.put_n(b.tag); rt.put_c(32);
rt.put_n(c.tag); rt.put_c(10);
rt.free(d*a); rt.free(d*b); rt.free(d*c);
return 0;
}
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