Function fftw_sys::fftw_plan_dft_r2c

pub unsafe extern "C" fn fftw_plan_dft_r2c(
    rank: c_int, 
    n: *const c_int, 
    in_: *mut f64, 
    out: *mut fftw_complex, 
    flags: c_uint
) -> fftw_plan