Method flatMap

future-java/src/main/java/io/trane/future/Future.java:403–403

Maps the result of this future to another future and flattens the result. @param f the mapping function that returns another future instance. @return a mapped and flattened future with the transformed result.

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

   * @return   a mapped and flattened future with the transformed result.
   */
  <R> Future<R> flatMap(Function<? super T, ? extends Future<R>> f);

  /**
   * Maps the result of this future using the provided Transformer. If this