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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title><assert.h></title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="<assert.h>"></a> <a name="tag_13_04"></a><!-- <assert.h> --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_13_04_01"></a>NAME</h4><blockquote>assert.h - verify program assertion</blockquote><h4><a name="tag_13_04_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><tt>#include <assert.h></tt></p></blockquote><h4><a name="tag_13_04_03"></a>DESCRIPTION</h4><blockquote><div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between therequirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers tothe ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div><p>The <i><assert.h></i> header shall define the <a href="../functions/assert.html"><i>assert</i>()</a> macro. It refers tothe macro NDEBUG which is not defined in the header. If NDEBUG is defined as a macro name before the inclusion of this header, the<a href="../functions/assert.html"><i>assert</i>()</a> macro shall be defined simply as:</p><pre><tt>#define assert(ignore)((void) 0)</tt></pre><p>Otherwise, the macro behaves as described in <a href="../functions/assert.html"><i>assert</i>()</a>.</p><p>The <a href="../functions/assert.html"><i>assert</i>()</a> macro shall be redefined according to the current state of NDEBUGeach time <i><assert.h></i> is included.</p><p>The <a href="../functions/assert.html"><i>assert</i>()</a> macro shall be implemented as a macro, not as a function. If themacro definition is suppressed in order to access an actual function, the behavior is undefined.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_13_04_04"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_04_05"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_04_06"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_04_07"></a>SEE ALSO</h4><blockquote><p>The System Interfaces volume of IEEE Std 1003.1-2001, <a href="../functions/assert.html"><i>assert</i>()</a></p></blockquote><h4><a name="tag_13_04_08"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 1. Derived from Issue 1 of the SVID.</p></blockquote><h4><a name="tag_13_04_09"></a>Issue 6</h4><blockquote><p>The definition of the <a href="../functions/assert.html"><i>assert</i>()</a> macro is changed for alignment with theISO/IEC 9899:1999 standard.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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