Function fitsio_sys::ffp2dd

pub unsafe extern "C" fn ffp2dd(
    fptr: *mut fitsfile, 
    group: c_long, 
    ncols: LONGLONG, 
    naxis1: LONGLONG, 
    naxis2: LONGLONG, 
    array: *mut f64, 
    status: *mut c_int
) -> c_int