Function cf_functions::cir::generic_leverage_diffusion

pub fn generic_leverage_diffusion(
    u: &Complex<f64>, 
    get_cf: &dyn Fn(&Complex<f64>) -> Complex<f64>, 
    t: f64, 
    sigma: f64, 
    v0: f64, 
    speed: f64, 
    eta_v: f64, 
    rho: f64
) -> Complex<f64>