In C++, there are eleven keywords which are simply alternate spellings of operators normally written with punctuation. These keywords are treated as such even in the preprocessor. They function as operators in #if, and they cannot be defined as macros or poisoned. In C, you can request that those keywords take their C++ meaning by including iso646.h. That header defines each one as a normal object-like macro expanding to the appropriate punctuator.
These are the named operators and their corresponding punctuators:
| Named Operator | Punctuator
|
and
|
&&
|
and_eq
|
&=
|
bitand
|
&
|
bitor
|
|
|
compl
|
~
|
not
|
!
|
not_eq
|
!=
|
or
|
||
|
or_eq
|
|=
|
xor
|
^
|
xor_eq
|
^=
|