sine-oscillator.rs

fn sine_wave_oscillator (w : f32) -> impl Iterator<Item=f32> {
    let mut x0 = w.sin();
    let mut x1 = 0.0; 
    let b = 2.0 * w.cos();

    std::iter::repeat_with(move || {
        let xn = b * x0 - x1;
        x1 = x0;
        x0 = xn;
        xn
    })
}