(defcstruct g-param-spec-enum
  (:parent-instance (:pointer (:struct g-param-spec)))
  (:enum-class (:pointer g-enum-class))
  (:default-value :int))  

:parent-instance

Private g-param-spec portion.

:enum-class

A g-enum-class class instance for the enum.

:default-value

A integer with the default value.