pub unsafe extern "C" fn faiss_write_index_binary_custom(
idx: *const FaissIndexBinary,
io_writer: *mut FaissIOWriter,
) -> c_intpub unsafe extern "C" fn faiss_write_index_binary_custom(
idx: *const FaissIndexBinary,
io_writer: *mut FaissIOWriter,
) -> c_int