Update sqratLightObj.h

module/Sqrat/sqratLightObj.h

@@ -152,6 +152,29 @@ struct LightObj {
         }
     }
 
+    /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    /// Constructs a LightObj from a C++ instance only if that instance exists. Otherwise, null is beings used.
+    ///
+    /// \param instance Pointer to a C++ class instance that has been bound already
+    /// \param v        VM that the object will exist in
+    ///
+    /// \tparam T Type of instance
+    ///
+    /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    template<class T>
+    explicit LightObj(T* instance, std::nullptr_t, HSQUIRRELVM vm = SqVM()) {
+        // Preserve the stack state
+        const StackGuard sg(vm);
+        // Push the instance on the stack
+        ClassType<T>::PushInstance(vm, instance, nullptr);
+        // Attempt to retrieve it
+        if (SQ_FAILED(sq_getstackobj(vm, -1, &mObj))) {
+            sq_resetobject(&mObj);
+        } else {
+            sq_addref(vm, &mObj);
+        }
+    }
+
     /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
     /// Constructs a LightObj from a C++ type
     ///