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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">&#26631;&#20934;&#24211;&#22836;&#25991;&#20214;</span> &lt;cstddef&gt;</h1>
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<p>&#27492;&#22836;&#25991;&#20214;&#21407;&#20316;&#20026; <code><b>&lt;stddef.h&gt;</b></code> &#23384;&#22312;&#20110; C &#26631;&#20934;&#24211;&#12290;</p>
<p>&#27492;&#22836;&#25991;&#20214;&#26159;<a href="cpp-utility.html">&#24037;&#20855;</a>&#24211;&#30340;&#19968;&#37096;&#20998;&#12290;</p>
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<h3><span class="mw-headline" id=".E5.AE.8F">&#23439;</span></h3>
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<div><a href="cpp-types-NULL.html"><span class="t-lines"><span>NULL</span></span></a></div>
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</td>
<td>&#23454;&#29616;&#23450;&#20041;&#30340;&#31354;&#25351;&#38024;&#24120;&#37327;<br />
<span class="t-mark">(&#23439;&#24120;&#37327;)</span></td>
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<div><a href="cpp-types-offsetof.html"><span class="t-lines"><span>offsetof</span></span></a></div>
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<td>&#20174;&#26631;&#20934;&#24067;&#23616;&#31867;&#22411;&#30340;&#36215;&#22987;&#21040;&#20854;&#25351;&#23450;&#25104;&#21592;&#30340;&#23383;&#33410;&#20559;&#31227;&#37327;<br />
<span class="t-mark">(&#23439;&#20989;&#25968;)</span></td>
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<div><a href="cpp-types-size_t.html"><span class="t-lines"><span>size_t</span></span></a></div>
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<td><a href="cpp-language-sizeof.html"><tt>sizeof</tt></a> &#36816;&#31639;&#31526;&#36820;&#22238;&#30340;&#26080;&#31526;&#21495;&#25972;&#25968;&#31867;&#22411;<br />
<span class="t-mark">(typedef)</span></td>
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<div><a href="cpp-types-ptrdiff_t.html"><span class="t-lines"><span>ptrdiff_t</span></span></a></div>
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<td>&#22312;&#20004;&#20010;&#25351;&#38024;&#30456;&#20943;&#26102;&#36820;&#22238;&#30340;&#26377;&#31526;&#21495;&#25972;&#25968;&#31867;&#22411;<br />
<span class="t-mark">(typedef)</span></td>
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<div><a href="cpp-types-nullptr_t.html"><span class="t-lines"><span>nullptr_t</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#31354;&#25351;&#38024;&#23383;&#38754;&#37327; <a href="cpp-language-nullptr.html"><tt>nullptr</tt></a> &#30340;&#31867;&#22411;<br />
<span class="t-mark">(typedef)</span></td>
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<div><a href="cpp-types-max_align_t.html"><span class="t-lines"><span>max_align_t</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#20855;&#26377;&#19981;&#23567;&#20110;&#20219;&#20309;&#22522;&#30784;&#31867;&#22411;&#30340;&#20869;&#23384;&#23545;&#40784;&#38656;&#27714;&#30340;&#24179;&#20961;&#31867;&#22411;<br />
<span class="t-mark">(typedef)</span></td>
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<div><a href="cpp-types-byte.html"><span class="t-lines"><span>byte</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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<td>&#23383;&#33410;&#31867;&#22411;<br />
<span class="t-mark">(&#26522;&#20030;)</span></td>
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<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">&#27010;&#35201;</span></h3>
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<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="kw1">using</span> ptrdiff_&shy;t <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">using</span> size_&shy;t <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">using</span> max_&shy;align_&shy;t <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">using</span> nullptr_&shy;t <span class="sy1">=</span> decltype<span class="br0">(</span>nullptr<span class="br0">)</span><span class="sy4">;</span>
<span class="kw2">enum</span> <span class="kw1">class</span> byte <span class="sy4">:</span> <span class="kw4">unsigned</span> <span class="kw4">char</span> <span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span>
<span class="co1">// &#23383;&#33410;&#31867;&#22411;&#36816;&#31639;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> IntType<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> byte<span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;=</span><span class="br0">(</span>byte<span class="sy3">&amp;</span> b, IntType shift<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> IntType<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> byte operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span>byte b, IntType shift<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> IntType<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> byte<span class="sy3">&amp;</span> operator<span class="sy1">&gt;&gt;=</span><span class="br0">(</span>byte<span class="sy3">&amp;</span> b, IntType shift<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> IntType<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> byte operator<span class="sy1">&gt;&gt;</span><span class="br0">(</span>byte b, IntType shift<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> byte<span class="sy3">&amp;</span> operator<span class="sy3">|</span><span class="sy1">=</span><span class="br0">(</span>byte<span class="sy3">&amp;</span> l, byte r<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> byte operator<span class="sy3">|</span><span class="br0">(</span>byte l, byte r<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> byte<span class="sy3">&amp;</span> operator<span class="sy3">&amp;</span><span class="sy1">=</span><span class="br0">(</span>byte<span class="sy3">&amp;</span> l, byte r<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> byte operator<span class="sy3">&amp;</span><span class="br0">(</span>byte l, byte r<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> byte<span class="sy3">&amp;</span> operator<span class="sy3">^</span><span class="sy1">=</span><span class="br0">(</span>byte<span class="sy3">&amp;</span> l, byte r<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> byte operator<span class="sy3">^</span><span class="br0">(</span>byte l, byte r<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> byte operator~<span class="br0">(</span>byte b<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> IntType<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> IntType to_integer<span class="br0">(</span>byte b<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="co2">#define NULL /* &#35265;&#25551;&#36848; */</span>
<span class="co2">#define offsetof(P, D) /* &#35265;&#25551;&#36848; */</span></pre></div>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<ul>
<li><span class="t-lc"><a href="cpp-types-NULL.html">NULL</a></span> &#20134;&#23450;&#20041;&#20110;&#19979;&#21015;&#22836;&#25991;&#20214;&#65306;
<ul>
<li><a href="cpp-header-clocale.html"><tt>&lt;clocale&gt;</tt></a></li>
<li><a href="cpp-header-ctime.html"><tt>&lt;ctime&gt;</tt></a></li>
<li><a href="cpp-header-cstring.html"><tt>&lt;cstring&gt;</tt></a></li>
<li><a href="cpp-header-cstdio.html"><tt>&lt;cstdio&gt;</tt></a></li>
<li><a href="cpp-header-cstdlib.html"><tt>&lt;cstdlib&gt;</tt></a></li>
<li><a href="cpp-header-cwchar.html"><tt>&lt;cwchar&gt;</tt></a></li>
</ul>
</li>
<li><span class="t-lc"><a href="cpp-types-size_t.html">std::size_t</a></span> &#20134;&#23450;&#20041;&#20110;&#19979;&#21015;&#22836;&#25991;&#20214;&#65306;
<ul>
<li><a href="cpp-header-ctime.html"><tt>&lt;ctime&gt;</tt></a></li>
<li><a href="cpp-header-cstring.html"><tt>&lt;cstring&gt;</tt></a></li>
<li><a href="cpp-header-cstdio.html"><tt>&lt;cstdio&gt;</tt></a></li>
<li><a href="cpp-header-cwchar.html"><tt>&lt;cwchar&gt;</tt></a></li>
<li><a href="cpp-header-cuchar.html"><tt>&lt;cuchar&gt;</tt></a> <span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></li>
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