callcc.dart

/// "call/cc" implemented in terms of eevee's "fuckit" operator.
///
/// See https://twitter.com/eevee/status/599308342364778496.
callcc(fn(continuation(returnValue))) {
  var completer = new Completer();

  scheduleMicrotask(() {
    fn((returnValue) => completer.complete(returnValue));
  });

  return fuckit completer.future;
}

/// "fuckit" implemented in terms of "call/cc".
fuckit(Future future) {
  return callcc((continuation) {
    future.then((value) => continuation(value));
  });
}