Implement pointer stealing for the auto-deleter utility.

source/Base/Shared.hpp

@@ -253,6 +253,16 @@ public:
         m_Inst = nullptr;
     }
 
+    /* --------------------------------------------------------------------------------------------
+     * Released the managed instance.
+    */
+    T * Grab()
+    {
+        T * ptr = m_Inst;
+        m_Inst = nullptr;
+        return ptr;
+    }
+
     /* --------------------------------------------------------------------------------------------
      * Retrieve the managed instance.
     */