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23 #ifndef INCLUDED_GR_STRETCH_FF_H
24 #define INCLUDED_GR_STRETCH_FF_H
50 static sptr make(
float lo,
size_t vlen=1);
52 virtual float lo()
const = 0;
53 virtual void set_lo(
float lo) = 0;
54 virtual size_t vlen()
const = 0;