Class FlatMap

future-java/src/main/java/io/trane/future/Promise.java:476–487

  }

  private static class FlatMap<T, R> extends Continuation<T, R> {
    private final Function<? super T, ? extends Future<R>> f;

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

    @Override
    final Future<R> apply(final Future<T> result) {
      return result.flatMap(f);
    }
  }

  @Override
  public final <R> Future<R> flatMap(final Function<? super T, ? extends Future<R>> f) {