Method call

src/Callback.java:47–47

The callback. @param arg The argument to the callback. @return The return value of the callback. @throws Exception any exception.

(T arg)

   * @throws Exception any exception.
   */
  public R call(T arg) throws Exception;

  /** The identity function (returns its argument).  */
  public static final Callback<Object, Object> PASSTHROUGH =