From e608057304d2e4dec1a616a3af78d3755cc79119 Mon Sep 17 00:00:00 2001
From: David Anderson <dvander@alliedmods.net>
Date: Wed, 3 Sep 2014 21:31:06 -0700
Subject: [PATCH] Sync a change from AMTL.

---
 public/amtl/am-refcounting.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/public/amtl/am-refcounting.h b/public/amtl/am-refcounting.h
index 028d6df5..ea869464 100644
--- a/public/amtl/am-refcounting.h
+++ b/public/amtl/am-refcounting.h
@@ -55,6 +55,13 @@ class AlreadyRefed
       : thing_(t)
     {
     }
+    AlreadyRefed(const AlreadyRefed<T> &other)
+      : thing_(other.thing_)
+    {
+        // If copy elision for some reason doesn't happen (for example, when
+        // returning from AdoptRef), just null out the source ref.
+        other.thing_ = NULL;
+    }
     ~AlreadyRefed() {
         if (thing_)
             thing_->Release();