(defcstruct g-param-spec-float
  (:parent-instance (:pointer (:struct g-param-spec)))
  (:minimum :float)
  (:maximum :float)
  (:default-value :float)
  (:epsilon :float))  

:parent-instance

Private g-param-spec portion.

:minimum

A float with the minimum value.

:maximum

A float with the maximum value.

:default-value

A float with the default value.

:epsilon

A float value, values closer than epsilon will be considered identical, the default value is 1e-30.