pub unsafe extern "C" fn arf_dot(
res: *mut arf_struct,
initial: *const arf_struct,
subtract: c_int,
x: arf_srcptr,
xstep: slong,
y: arf_srcptr,
ystep: slong,
len: slong,
prec: slong,
rnd: arf_rnd_t,
) -> c_int