The Downcasting Facility
========================

.. concept:: template<typename T> Downcastable

.. doxygenstruct:: units::downcast_base
   :members:

.. doxygenstruct:: units::downcast_child
   :members:

.. doxygenstruct:: units::downcast_poison
   :members:

.. doxygenstruct:: units::downcast_dispatch
   :members:

.. doxygentypedef:: units::downcast