tree a85e400d89af201053c8a9f8f04dcb4775fcb655
parent cd2d52527d54418049ba92c984baef0c1a295961
author Andreas Wundsam <andreas.wundsam@bigswitch.com> 1375490907 -0700
committer Andreas Wundsam <andreas.wundsam@bigswitch.com> 1375490907 -0700

frontend: add support for discrimiator fields

In an abstract base class (e.g., of_action), the dicriminator field
represents the field that distinguishes between different type of
subclasses. It is marked in the base class with a '== ?', as in

   uint32_t type == ?

Each class may only define at most one discriminator field.