Method let

future-java/src/main/java/io/trane/future/Local.java:182–190

Executes the supplier with the provided value and then rolls back to the previous local value. @param value value to be set. @param s supplier to be executed with the provided value. @return the result of the supplier.

(final T value, final Supplier<U> s)

   * @return       the result of the supplier.
   */
  public final <U> U let(final T value, final Supplier<U> s) {
    final Optional<T> saved = get();
    set(Optional.of(value));
    try {
      return s.get();
    } finally {
      set(saved);
    }
  }
}