Write a C++ std::vector<wxString> keywords = { ...} with every single C++ keyword, here is the documentation so you can do it correctly:

C++ keywords
 C++ C++ language Keywords 
This is a list of reserved keywords in C++. Since they are used by the language, these keywords are not available for re-definition or overloading. As an exception, they are not considered reserved in attributes (excluding attribute argument lists).(since C++11)

A – C	D – P	R – Z
alignas (C++11)
alignof (C++11)
and
and_eq
asm
atomic_cancel (TM TS)
atomic_commit (TM TS)
atomic_noexcept (TM TS)
auto (1) (2) (3) (4)
bitand
bitor
bool
break
case
catch
char
char8_t (C++20)
char16_t (C++11)
char32_t (C++11)
class (1)
compl
concept (C++20)
const
consteval (C++20)
constexpr (C++11)
constinit (C++20)
const_cast
continue
co_await (C++20)
co_return (C++20)
co_yield (C++20)
decltype (C++11)
default (1)
delete (1)
do
double
dynamic_cast
else
enum (1)
explicit
export (1) (3)
extern (1)
false
float
for (1)
friend
goto
if (2) (4)
inline (1)
int
long
mutable (1)
namespace
new
noexcept (C++11)
not
not_eq
nullptr (C++11)
operator (4)
or
or_eq
private (3)
protected
public
reflexpr (reflection TS)
register (2)
reinterpret_cast
requires (C++20)
return
short
signed
sizeof (1)
static
static_assert (C++11)
static_cast
struct (1)
switch
synchronized (TM TS)
template
this (4)
thread_local (C++11)
throw
true
try
typedef
typeid
typename
union
unsigned
using (1)
virtual
void
volatile
wchar_t
while
xor
xor_eq

(1) — meaning changed or new meaning added in C++11.
(2) — meaning changed or new meaning added in C++17.
(3) — meaning changed or new meaning added in C++20.
(4) — new meaning added in C++23.
Note that and, bitor, or, xor, compl, bitand, and_eq, or_eq, xor_eq, not, and not_eq (along with the digraphs <%, %>, <:, :>, %:, and %:%:) provide an alternative way to represent standard tokens. These keywords are also considered reserved in attributes (excluding attribute argument lists), but some implementations handle them the same as the others.(since C++11)

In addition to keywords, there are identifiers with special meaning, which may be used as names of objects or functions, but have special meaning in certain contexts.

final (C++11)
override (C++11)
transaction_safe (TM TS)
transaction_safe_dynamic (TM TS)
import (C++20)
module (C++20)

Also, all identifiers that contain a double underscore __ in any position and each identifier that begins with an underscore followed by an uppercase letter is always reserved and all identifiers that begin with an underscore are reserved for use as names in the global namespace. See identifiers for more details.

The namespace std is used to place names of the standard C++ library. See Extending namespace std for the rules about adding names to it.

The name posix is reserved for a future top-level namespace. The behavior is undefined if a program declares or defines anything in that namespace.

(since C++11)
The following tokens are recognized by the preprocessor when in context of a preprocessor directive:

if
elif
else
endif
ifdef
ifndef
elifdef (C++23)
elifndef (C++23)
define
undef
include
line
error
warning (C++23)
pragma
defined
__has_include (C++17)
__has_cpp_attribute (C++20)

export (C++20)
import (C++20)
module (C++20)

The following tokens are recognized by the preprocessor outside the context of a preprocessor directive:

_Pragma (C++11)