src/lib/rand.rs


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/**
 * Bindings the runtime's random number generator (ISAAC).
 */

native "rust" mod rustrt {
  type rctx;
  fn rand_new() -> rctx;
  fn rand_next(rctx c) -> u32;
  fn rand_free(rctx c);
}

type rng = obj { fn next() -> u32; };

fn mk_rng() -> rng {
  obj rt_rng(rustrt.rctx c) {
    fn next() -> u32 {
      ret rustrt.rand_next(c);
    }
    drop {
      rustrt.rand_free(c);
    }
  }

  ret rt_rng(rustrt.rand_new());
}