pub unsafe extern "C" fn CeedOperatorMultigridLevelCreate(
op_fine: CeedOperator,
p_mult_fine: CeedVector,
rstr_coarse: CeedElemRestriction,
basis_coarse: CeedBasis,
op_coarse: *mut CeedOperator,
op_prolong: *mut CeedOperator,
op_restrict: *mut CeedOperator,
) -> c_int