Function fftw_sys::fftw_plan_r2r_3d

pub unsafe extern "C" fn fftw_plan_r2r_3d(
    n0: c_int, 
    n1: c_int, 
    n2: c_int, 
    in_: *mut f64, 
    out: *mut f64, 
    kind0: fftw_r2r_kind, 
    kind1: fftw_r2r_kind, 
    kind2: fftw_r2r_kind, 
    flags: c_uint
) -> fftw_plan