In namespace std, the following names are reserved for previous standardization: auto_ptr, binary_function, bind1st, bind2nd, binder1st, binder2nd, const_mem_fun1_ref_t, const_mem_fun1_t, const_mem_fun_ref_t, const_mem_fun_t, get_unexpected, mem_fun1_ref_t, mem_fun1_t, mem_fun_ref_t, mem_fun_ref, mem_fun_t, mem_fun, pointer_to_binary_function, pointer_to_unary_function, ptr_fun, random_shuffle, set_unexpected, unary_function, unexpected, and unexpected_handler.