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<title>The C Preprocessor: C++ Named Operators</title>
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Previous: <a href="System_002dspecific-Predefined-Macros.html#System_002dspecific-Predefined-Macros" accesskey="p" rel="prev">System-specific Predefined Macros</a>, Up: <a href="Predefined-Macros.html#Predefined-Macros" accesskey="u" rel="up">Predefined Macros</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index-of-Directives.html#Index-of-Directives" title="Index" rel="index">Index</a>]</p>
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<a name="C_002b_002b-Named-Operators-1"></a>
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<h4 class="subsection">3.7.4 C++ Named Operators</h4>
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<a name="index-named-operators"></a>
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<a name="index-C_002b_002b-named-operators"></a>
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<a name="index-iso646_002eh"></a>
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<p>In C++, there are eleven keywords which are simply alternate spellings
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of operators normally written with punctuation. These keywords are
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treated as such even in the preprocessor. They function as operators in
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‘<samp>#if</samp>’, and they cannot be defined as macros or poisoned. In C, you
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can request that those keywords take their C++ meaning by including
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<samp>iso646.h</samp>. That header defines each one as a normal object-like
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macro expanding to the appropriate punctuator.
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</p>
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<p>These are the named operators and their corresponding punctuators:
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</p>
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<table>
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<tr><td>Named Operator</td><td>Punctuator</td></tr>
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<tr><td><code>and</code></td><td><code>&&</code></td></tr>
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<tr><td><code>and_eq</code></td><td><code>&=</code></td></tr>
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<tr><td><code>bitand</code></td><td><code>&</code></td></tr>
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<tr><td><code>bitor</code></td><td><code>|</code></td></tr>
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<tr><td><code>compl</code></td><td><code>~</code></td></tr>
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<tr><td><code>not</code></td><td><code>!</code></td></tr>
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<tr><td><code>not_eq</code></td><td><code>!=</code></td></tr>
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<tr><td><code>or</code></td><td><code>||</code></td></tr>
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<tr><td><code>or_eq</code></td><td><code>|=</code></td></tr>
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<tr><td><code>xor</code></td><td><code>^</code></td></tr>
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<tr><td><code>xor_eq</code></td><td><code>^=</code></td></tr>
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