Method BiMap

future-java/src/main/java/io/trane/future/Promise.java:558–561

(final Future<U> other, final BiFunction<? super T, ? super U, ? extends R> f)

    private final Future<U> other;

    public BiMap(final Future<U> other, final BiFunction<? super T, ? super U, ? extends R> f) {
      this.other = other;
      this.f = f;
    }

    @Override
    final Future<R> apply(final Future<T> result) {