(cffi:defcstruct enum-class
  (:type-class (:pointer (:struct type-class)))
  (:minimum :int)
  (:maximum :int)
  (:n-values :uint)
  (:values (:pointer enum-value)))  

:type-class

The parent class.

:minimum

The smallest possible value.

:maximum

The largest possible value.

:n-values

The number of possible values.

:values

The array of g:enum-value instances describing the individual values.