rust macro

test.rs

trait Persistable {
  fn persist_test(&self) -> int;
}

fn persist<T: Persistable>(val : T) {
  io::println(fmt!("Val: %d", val.persist_test()));
}

macro_rules! object(
  ($cname:ident { $($tname:ident : $typ:ty),* }) => (
    struct $cname {
      $( $tname : $typ),*
    }

    impl Persistable for $cname {
      fn persist_test(&self) -> int {
        return self.x;
      }
    }
  )
)

object!(vec3 {
  x : int,
  y : int,
  z : int
})



fn main() {
  let v = vec3{x: 1, y: 2, z: 3};
  persist(v);
}