Function _check_axis_support

numpy/core/src/umath/ufunc_object.c:1758–1771

* Check whether the gufunc can be used with axis, i.e., that there is only * a single, shared core dimension (which means that operands either have * that dimension, or have no core dimensions). Returns 0 if all is fine, * and sets an error and returns -1 if not. */

 * and sets an error and returns -1 if not.
 */
static int
_check_axis_support(PyUFuncObject *ufunc) {
    if (ufunc->core_num_dim_ix != 1) {
        PyErr_Format(PyExc_TypeError,
                     "%s: axis can only be used with a single shared core "
                     "dimension, not with the %d distinct ones implied by "
                     "signature %s.",
                     ufunc_get_name_cstr(ufunc),
                     ufunc->core_num_dim_ix,
                     ufunc->core_signature);
        return -1;
    }
    return 0;
}

/*
 * Check whether the gufunc can be used with keepdims, i.e., that all its