Checks for nulls in weakrefs

2017-11-12 15:58:53 -08:00
parent ef700ef8d7
commit 2180c4c1fe
1 changed files with 19 additions and 0 deletions
@@ -0,0 +1,19 @@
+
+/proc/WEAKREF(datum/input)
+	if(istype(input) && !QDELETED(input))
+		if(!input.weak_reference)
+			input.weak_reference = new /datum/weakref(input)
+		return input.weak_reference
+
+/datum/weakref
+	var/reference
+
+/datum/weakref/New(datum/thing)
+	reference = REF(thing)
+
+/datum/weakref/Destroy()
+	return QDEL_HINT_LETMELIVE	//Let BYOND autoGC thiswhen nothing is using it anymore.
+
+/datum/weakref/proc/resolve()
+	var/datum/D = locate(reference)
+	return (!QDELETED(D) && D.weak_reference == src) ? D : null