[zombie.names]

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

(1.1)
auto_ptr,
(1.2)
auto_ptr_ref,
(1.3)
binary_function,
(1.4)
binary_negate,
(1.5)
bind1st,
(1.6)
bind2nd,
(1.7)
binder1st,
(1.8)
binder2nd,
(1.9)
codecvt_mode,
(1.10)
codecvt_utf16,
(1.11)
codecvt_utf8,
(1.12)
codecvt_utf8_utf16,
(1.13)
const_mem_fun1_ref_t,
(1.14)
const_mem_fun1_t,
(1.15)
const_mem_fun_ref_t,
(1.16)
const_mem_fun_t,
(1.17)
consume_header,
(1.18)
declare_no_pointers,
(1.19)
declare_reachable,
(1.20)
generate_header,
(1.21)
get_pointer_safety,
(1.22)
get_temporary_buffer,
(1.23)
get_unexpected,
(1.24)
gets,
(1.25)
is_literal_type,
(1.26)
is_literal_type_v,
(1.27)
little_endian,
(1.28)
mem_fun1_ref_t,
(1.29)
mem_fun1_t,
(1.30)
mem_fun_ref_t,
(1.31)
mem_fun_ref,
(1.32)
mem_fun_t,
(1.33)
mem_fun,
(1.34)
not1,
(1.35)
not2,
(1.36)
pointer_safety,
(1.37)
pointer_to_binary_function,
(1.38)
pointer_to_unary_function,
(1.39)
ptr_fun,
(1.40)
random_shuffle,
(1.41)
raw_storage_iterator,
(1.42)
result_of,
(1.43)
result_of_t,
(1.44)
return_temporary_buffer,
(1.45)
set_unexpected,
(1.46)
unary_function,
(1.47)
unary_negate,
(1.48)
uncaught_exception,
(1.49)
undeclare_no_pointers,
(1.50)
undeclare_reachable, and
(1.51)
unexpected_handler.

The following names are reserved as members for previous standardization, and may not be used as a name for object-like macros in portable code:

(2.1)
argument_type,
(2.2)
first_argument_type,
(2.3)
io_state,
(2.4)
op,
(2.5)
open_mode,
(2.6)
preferred,
(2.7)
second_argument_type,
(2.8)
seek_dir, and
(2.9)
strict.

3

#

The name stossc is reserved as a member function for previous standardization, and may not be used as a name for function-like macros in portable code.

4

#

The header names <ccomplex>, <ciso646>, <codecvt>, <cstdalign>, <cstdbool>, and <ctgmath> are reserved for previous standardization.

16 Library introduction [library]

16.4 Library-wide requirements [requirements]

16.4.5 Constraints on programs [constraints]

16.4.5.3 Reserved names [reserved.names]

16.4.5.3.2 Zombie names [zombie.names]