<html lang="en">
<head>
<title>Predefined Macros - The C Preprocessor</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="The C Preprocessor">
<meta name="generator" content="makeinfo 4.13">
<link title="Top" rel="start" href="index.html#Top">
<link rel="up" href="Macros.html#Macros" title="Macros">
<link rel="prev" href="Variadic-Macros.html#Variadic-Macros" title="Variadic Macros">
<link rel="next" href="Undefining-and-Redefining-Macros.html#Undefining-and-Redefining-Macros" title="Undefining and Redefining Macros">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<!--
Copyright (C) 1987-2015 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation. A copy of
the license is included in the
section entitled ``GNU Free Documentation License''.
This manual contains no Invariant Sections. The Front-Cover Texts are
(a) (see below), and the Back-Cover Texts are (b) (see below).
(a) The FSF's Front-Cover Text is:
A GNU Manual
(b) The FSF's Back-Cover Text is:
You have freedom to copy and modify this GNU Manual, like GNU
software. Copies published by the Free Software Foundation raise
funds for GNU development.
-->
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css"><!--
pre.display { font-family:inherit }
pre.format { font-family:inherit }
pre.smalldisplay { font-family:inherit; font-size:smaller }
pre.smallformat { font-family:inherit; font-size:smaller }
pre.smallexample { font-size:smaller }
pre.smalllisp { font-size:smaller }
span.sc { font-variant:small-caps }
span.roman { font-family:serif; font-weight:normal; }
span.sansserif { font-family:sans-serif; font-weight:normal; }
--></style>
</head>
<body>
<div class="node">
<a name="Predefined-Macros"></a>
<p>
Next: <a rel="next" accesskey="n" href="Undefining-and-Redefining-Macros.html#Undefining-and-Redefining-Macros">Undefining and Redefining Macros</a>,
Previous: <a rel="previous" accesskey="p" href="Variadic-Macros.html#Variadic-Macros">Variadic Macros</a>,
Up: <a rel="up" accesskey="u" href="Macros.html#Macros">Macros</a>
<hr>
</div>
<h3 class="section">3.7 Predefined Macros</h3>
<p><a name="index-predefined-macros-59"></a>Several object-like macros are predefined; you use them without
supplying their definitions. They fall into three classes: standard,
common, and system-specific.
<p>In C++, there is a fourth category, the named operators. They act like
predefined macros, but you cannot undefine them.
<ul class="menu">
<li><a accesskey="1" href="Standard-Predefined-Macros.html#Standard-Predefined-Macros">Standard Predefined Macros</a>
<li><a accesskey="2" href="Common-Predefined-Macros.html#Common-Predefined-Macros">Common Predefined Macros</a>
<li><a accesskey="3" href="System_002dspecific-Predefined-Macros.html#System_002dspecific-Predefined-Macros">System-specific Predefined Macros</a>
<li><a accesskey="4" href="C_002b_002b-Named-Operators.html#C_002b_002b-Named-Operators">C++ Named Operators</a>
</ul>
</body></html>