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23 #ifndef INCLUDED_GR_THRESHOLD_FF_H
24 #define INCLUDED_GR_THRESHOLD_FF_H
54 static sptr make(
float lo,
float hi,
float initial_state=0);
56 virtual float lo ()
const = 0;
57 virtual void set_lo (
float lo) = 0;
58 virtual float hi ()
const = 0;
59 virtual void set_hi (
float hi) = 0;
60 virtual float last_state ()
const = 0;
61 virtual void set_last_state (
float last_state) = 0;