[zombie.names]

In namespace std, the following names are reserved for previous standardization:

(1.1)
auto_ptr,
(1.2)
binary_function,
(1.3)
bind1st,
(1.4)
bind2nd,
(1.5)
binder1st,
(1.6)
binder2nd,
(1.7)
const_mem_fun1_ref_t,
(1.8)
const_mem_fun1_t,
(1.9)
const_mem_fun_ref_t,
(1.10)
const_mem_fun_t,
(1.11)
get_unexpected,
(1.12)
mem_fun1_ref_t,
(1.13)
mem_fun1_t,
(1.14)
mem_fun_ref_t,
(1.15)
mem_fun_ref,
(1.16)
mem_fun_t,
(1.17)
mem_fun,
(1.18)
pointer_to_binary_function,
(1.19)
pointer_to_unary_function,
(1.20)
ptr_fun,
(1.21)
random_shuffle,
(1.22)
set_unexpected,
(1.23)
unary_function,
(1.24)
unexpected, and
(1.25)
unexpected_handler.

20 Library introduction [library]