public function addUse(string $used) : bool
    {
        $retval = false;
        if (array_search($used, $this->use_list) === false) {
            $this->use_list[] = $used;
            $retval = true;
        }

        return $retval;
    }
public function addUse(string $used) : bool
    {
        $retval = false;
        if (array_search($used, $this->use_list) === false) {
            $this->use_list[] = $used;
            $retval = true;
        }

        return $retval;
    }
public function addUse ( string $ used ) : bool { $ retval = false ; if ( array_search ( $ used , $ this -> use_list ) === false ) { $ this -> use_list [ ] = $ used ; $ retval = true ; } return $ retval ; }
Add a new use clause to this instance. If use clause already exists then the action is ignored.
@param string $used Object path and name to be used
@return bool Returns true if $used is added or false if already exists
Add a new use clause to this instance . If use clause already exists then the action is ignored .