/**
  * Constructor - checks that the registry object has been passed correctly.
  *
  * @param	vB_Registry	Instance of the vBulletin data registry object - expected to have the database object as one of its $this->db member.
  * @param	integer		One of the ERRTYPE_x constants
  */
 function vB_DataManager_Thread(&$registry, $errtype = ERRTYPE_STANDARD)
 {
     parent::vB_DataManager_ThreadPost($registry, $errtype);
     ($hook = vBulletinHook::fetch_hook('threaddata_start')) ? eval($hook) : false;
 }