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<title>The C Preprocessor: Predefined Macros</title>
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Next: <a href="Undefining-and-Redefining-Macros.html#Undefining-and-Redefining-Macros" accesskey="n" rel="next">Undefining and Redefining Macros</a>, Previous: <a href="Variadic-Macros.html#Variadic-Macros" accesskey="p" rel="prev">Variadic Macros</a>, Up: <a href="Macros.html#Macros" accesskey="u" rel="up">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="Predefined-Macros-1"></a>
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<h3 class="section">3.7 Predefined Macros</h3>
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<a name="index-predefined-macros"></a>
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<p>Several object-like macros are predefined; you use them without
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supplying their definitions. They fall into three classes: standard,
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common, and system-specific.
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</p>
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<p>In C++, there is a fourth category, the named operators. They act like
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predefined macros, but you cannot undefine them.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Standard-Predefined-Macros.html#Standard-Predefined-Macros" accesskey="1">Standard Predefined Macros</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Common-Predefined-Macros.html#Common-Predefined-Macros" accesskey="2">Common Predefined Macros</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="System_002dspecific-Predefined-Macros.html#System_002dspecific-Predefined-Macros" accesskey="3">System-specific Predefined Macros</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="C_002b_002b-Named-Operators.html#C_002b_002b-Named-Operators" accesskey="4">C++ Named Operators</a>:</td><td> </td><td align="left" valign="top">
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