Method ioUnset

src/main/java/org/sfj/ChiseledMap.java:479–486

Clear a value. @param key key value @return prior value @throws IOException on exception

(K key)

   * @throws IOException on exception
   */
  public synchronized V ioUnset(K key) throws IOException {
    V p = ioGet(key);
    if (p != null) {
      append(key, null);
      map.remove(key);
    }
    return p;
  }

  /**
   * Associate a key to a value