// file: ll_set_1.cc//// isip include files//#include "link_list.h"#include "link_list_constants.h"// method: set_curr_cc//// arguments://  Link_node* node : (input) a link node to set in curr position//// return: a logical_1 to indicate success//// this method sets the specified node at the current position of the// linked list//logical_1 Link_list::set_curr_cc(Link_node* node_a) {  // exit ungracefully if the node is null  //  if (node_a == (Link_node*)NULL) {    return ISIP_FALSE;  }  // set this node at current position  //  curr_d = node_a;    // exit gracefully  //  return ISIP_TRUE;}