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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title><stddef.h></title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_008_856"> </a>NAME</h4><blockquote>stddef.h - standard type definitions</blockquote><h4><a name = "tag_000_008_857"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <stddef.h></code></pre></blockquote><h4><a name = "tag_000_008_858"> </a>DESCRIPTION</h4><blockquote>The<i><stddef.h></i>header defines the following:<dl compact><dt>NULL<dd>Null pointer constant.<dt>offsetof(<i>type</i>, <i>member-designator</i>)<dd><br>Integral constant expression of type <b>size_t</b>, thevalue of which is the offset in bytes to the structure member(<i>member-designator</i>),from the beginning of its structure (<i>type</i>).</dl><p>The<i><stddef.h></i>header defines through <b>typedef</b>:<dl compact><dt><b>ptrdiff_t</b><dd><index term="data type, ptrdiff_t"></index>Signed integral type of the result of subtracting twopointers.<dt><b>wchar_t</b><dd><index term="data type, wchar_t"></index>Integral type whose range of values can represent distinct wide-charactercodes for all members of the largest character set specifiedamong the locales supported by the compilation environment:the null character has the code value 0 and each member ofthe Portable Character Set has a code valueequal to its value when used as the lone character in an integercharacter constant.<dt><b>size_t</b><dd><index term="data type, size_t"></index>Unsigned integral type of the result of the<i>sizeof</i>operator.</dl></blockquote><h4><a name = "tag_000_008_859"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_860"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_861"> </a>SEE ALSO</h4><blockquote><i><a href="wchar.h.html"><wchar.h></a></i>,<i><a href="systypes.h.html"><sys/types.h></a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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