mps_arg_s args[3];

    args[0].key = MPS_KEY_MIN_SIZE;

    args[0].val.size = 32;

    args[1].key = MPS_KEY_MAX_SIZE;

    args[1].val.size = 1024;

    args[2].key = MPS_KEY_ARGS_END;

    mps_pool_create_k(&pool, some_pool_class(), args);