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 | ^=
|