/datum
	var/gc_destroyed //Time when this object was destroyed.
	var/list/active_timers  //for SStimer
	var/list/datum_components //for /datum/components
	var/datum_flags = NONE
	var/datum/weakref/weak_reference

#ifdef TESTING
	var/running_find_references
	var/last_find_references = 0
#endif

#ifdef DATUMVAR_DEBUGGING_MODE
	var/list/cached_vars
#endif

// Default implementation of clean-up code.
// This should be overridden to remove all references pointing to the object being destroyed.
// Return the appropriate QDEL_HINT; in most cases this is QDEL_HINT_QUEUE.
/datum/proc/Destroy(force=FALSE, ...)
	tag = null
	weak_reference = null	//ensure prompt GCing of weakref.

	var/list/timers = active_timers
	active_timers = null
	for(var/thing in timers)
		var/datum/timedevent/timer = thing
		if (timer.spent)
			continue
		qdel(timer)

	var/list/dc = datum_components
	if(dc)
		var/all_components = dc[/datum/component]
		if(length(all_components))
			for(var/I in all_components)
				var/datum/component/C = I
				qdel(C, FALSE, TRUE)
		else
			var/datum/component/C = all_components
			qdel(C, FALSE, TRUE)
		dc.Cut()

	return QDEL_HINT_QUEUE

#ifdef DATUMVAR_DEBUGGING_MODE
/datum/proc/save_vars()
	cached_vars = list()
	for(var/i in vars)
		if(i == "cached_vars")
			continue
		cached_vars[i] = vars[i]

/datum/proc/check_changed_vars()
	. = list()
	for(var/i in vars)
		if(i == "cached_vars")
			continue
		if(cached_vars[i] != vars[i])
			.[i] = list(cached_vars[i], vars[i])

/datum/proc/txt_changed_vars()
	var/list/l = check_changed_vars()
	var/t = "[src]([REF(src)]) changed vars:"
	for(var/i in l)
		t += "\"[i]\" \[[l[i][1]]\] --> \[[l[i][2]]\] "
	t += "."

/datum/proc/to_chat_check_changed_vars(target = world)
	to_chat(target, txt_changed_vars())
#endif