Use undeclared identifiers

Development Programming & Scripting
7

Now you’ve declared it as global scope (within your cpp file only) function instead of member of your UOpenDoor class.

Add this declaration to your header file:

void OpenDoor();

And modify your implementation to include UOpenDoor:: in front of your function same. So it’s

  void UOpenDoor::OpenDoor()

instead of:

  void OpenDoor()