Basic mutability framework

src/Engine/MinimalEngine.h

@@ -49,7 +49,7 @@ public:
     ~RefObject()
     {
         {
-            std::unique_lock lock(registeredObjectsLock);
+            std::scoped_lock lock(registeredObjectsLock);
             registeredObjects.erase(handle);
         }
 //    #pragma warning( disable: 4150)
@@ -114,7 +114,7 @@ public:
     }
     RefPtr(T *ptr, Deleter deleter = Deleter())
     {
-        std::unique_lock l(registeredObjectsLock);
+        std::scoped_lock l(registeredObjectsLock);
         auto registeredObj = registeredObjects.find(ptr);
         // get here for thread safetly
         auto registeredEnd = registeredObjects.end();
@@ -249,6 +249,10 @@ public:
     {
         return object->getHandle();
     }
+    RefPtr<T, Deleter> clone()
+    {
+        return RefPtr<T, Deleter>(new T(*getHandle()));
+    }
 
 private:
     RefObject<T, Deleter> *object;