130 lines
4.6 KiB
HTML
130 lines
4.6 KiB
HTML
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<title><stddef.h></title>
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<basefont size="3"> <a name="<stddef.h>"></a> <a name="tag_13_47"></a><!-- <stddef.h> -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_13_47_01"></a>NAME</h4>
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<blockquote>stddef.h - standard type definitions</blockquote>
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<h4><a name="tag_13_47_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><tt>#include <stddef.h></tt></p>
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</blockquote>
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<h4><a name="tag_13_47_03"></a>DESCRIPTION</h4>
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<blockquote>
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<div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"
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border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
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requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to
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the ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div>
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<p>The <i><stddef.h></i> header shall define the following macros:</p>
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<dl compact>
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<dt>NULL</dt>
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<dd>Null pointer constant.</dd>
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<dt>offsetof(<i>type</i>, <i>member-designator</i>)</dt>
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<dd><br>
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Integer constant expression of type <b>size_t</b>, the value of which is the offset in bytes to the structure member
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(<i>member-designator</i>), from the beginning of its structure (<i>type</i>).</dd>
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</dl>
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<p>The <i><stddef.h></i> header shall define the following types:</p>
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<dl compact>
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<dt><b>ptrdiff_t</b></dt>
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<dd>Signed integer type of the result of subtracting two pointers.</dd>
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<dt><b>wchar_t</b></dt>
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<dd>Integer type whose range of values can represent distinct wide-character codes for all members of the largest character set
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specified among the locales supported by the compilation environment: the null character has the code value 0 and each member of
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the portable character set has a code value equal to its value when used as the lone character in an integer character
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constant.</dd>
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<dt><b>size_t</b></dt>
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<dd>Unsigned integer type of the result of the <i>sizeof</i> operator.</dd>
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</dl>
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<p>The implementation shall support one or more programming environments in which the widths of <b>ptrdiff_t</b>, <b>size_t</b>,
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and <b>wchar_t</b> are no greater than the width of type <b>long</b>. The names of these programming environments can be obtained
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using the <a href="../functions/confstr.html"><i>confstr</i>()</a> function or the <a href=
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"../utilities/getconf.html"><i>getconf</i></a> utility.</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_13_47_04"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_13_47_05"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_13_47_06"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_13_47_07"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="wchar.h.html"><i><wchar.h></i></a> , <a href="sys/types.h.html"><i><sys/types.h></i></a> , the System
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Interfaces volume of IEEE Std 1003.1-2001, <a href="../functions/confstr.html"><i>confstr</i>()</a>, the Shell and
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Utilities volume of IEEE Std 1003.1-2001, <a href="../utilities/getconf.html"><i>getconf</i></a></p>
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</blockquote>
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<h4><a name="tag_13_47_08"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 4. Derived from the ANSI C standard.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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