/// <summary>
 /// Save the contents of a POF user type instance by writing its
 /// state using the specified <see cref="IPofWriter"/> object.
 /// </summary>
 /// <param name="writer">
 /// The <b>IPofWriter</b> to which to write the object's state.
 /// </param>
 /// <exception cref="IOException">
 /// If an I/O error occurs.
 /// </exception>
 public override void WriteExternal(IPofWriter writer)
 {
     writer.WriteInt32Array(0, m_aiElements);
 }