hat inherits from both derrived classes.

    <h2>Virtual Base Classes in Memory</h2>

    Classes with a virtual base will have an entry in their VTable
    indicating the offset at which that class can be found. Virtual
    functions accessing the virtual base class will use this offset.
    <p>
    There will also be trampoline functions for any virtual function
    that is not overridden, which sets the this* appropriately using
    that offset.
    <p>
    An example of a simple virtual base class:
   