From 2180c4c1fee7981cb9d1e4a5be1fe0bcc0f88764 Mon Sep 17 00:00:00 2001
From: kevinz000 <2003111+kevinz000@users.noreply.github.com>
Date: Sun, 12 Nov 2017 15:58:53 -0800
Subject: [PATCH] Checks for nulls in weakrefs

---
 code/datums/weakrefs.dm | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 code/datums/weakrefs.dm

diff --git a/code/datums/weakrefs.dm b/code/datums/weakrefs.dm
new file mode 100644
index 0000000000..8af2491451
--- /dev/null
+++ b/code/datums/weakrefs.dm
@@ -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