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(cpp-300.info)C++ Named Operators

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C++ Named Operators
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   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'         `^='