Function cassandra_cpp_sys::cass_user_type_set_custom

pub unsafe extern "C" fn cass_user_type_set_custom(
    user_type: *mut CassUserType, 
    index: size_t, 
    class_name: *const c_char, 
    value: *const cass_byte_t, 
    value_size: size_t
) -> CassError