From fbb1d45b16cee0e5b3b400d2ea677d765002da8e Mon Sep 17 00:00:00 2001
From: Boris Zbarsky <bzbarsky@mit.edu>
Date: Fri, 23 Oct 2009 16:24:47 -0400
Subject: [PATCH] Bug 523651.  Add a CallQueryInterface that works well with
 nsCOMPtr.  r=bsmedberg

---
 xpcom/glue/nsCOMPtr.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/xpcom/glue/nsCOMPtr.h b/xpcom/glue/nsCOMPtr.h
index dc3503a33052..fb523c2671ea 100644
--- a/xpcom/glue/nsCOMPtr.h
+++ b/xpcom/glue/nsCOMPtr.h
@@ -1412,6 +1412,14 @@ getter_AddRefs( nsCOMPtr<T>& aSmartPtr )
     return nsGetterAddRefs<T>(aSmartPtr);
   }
 
+template <class T, class DestinationType>
+inline
+nsresult
+CallQueryInterface( T* aSource, nsGetterAddRefs<DestinationType> aDestination )
+{
+    return CallQueryInterface(aSource,
+                              static_cast<DestinationType**>(aDestination));
+}
 
 
   // Comparing two |nsCOMPtr|s