Method Map

future-java/src/main/java/io/trane/future/Promise.java:453–455

(final Function<? super T, ? extends R> f)

    private final Function<? super T, ? extends R> f;

    public Map(final Function<? super T, ? extends R> f) {
      this.f = f;
    }

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