pub unsafe extern "C" fn reb_simulation_diff(
r1: *mut reb_simulation,
r2: *mut reb_simulation,
output_option: c_int,
) -> c_intpub unsafe extern "C" fn reb_simulation_diff(
r1: *mut reb_simulation,
r2: *mut reb_simulation,
output_option: c_int,
) -> c_int