public class Container<T> {
  private final T inner;

  public Container(final T inner) {
    this.inner = inner;
  }

  public <R> Container<R> map(final Function<T,R> f) {
    return lift(f).apply(this);
  }

  public <R> Function<Container<T>, Container<R>> lift(final Function<T,R> f) {
      return containerT -> new Container(f.apply(containerT.inner));
  }
}