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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>bitset</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-utility.html">utility</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-bitset.html">&lt;bitset&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> N <span class="sy1">&gt;</span><br />
<span class="kw1">class</span> bitset<span class="sy4">;</span></span></div>
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<p>&#31867;&#27169;&#26495; <code>bitset</code> &#34920;&#31034;&#19968;&#20010; <code>N</code> &#20301;&#30340;&#22266;&#23450;&#22823;&#23567;&#24207;&#21015;&#12290;&#21487;&#20197;&#29992;&#26631;&#20934;&#36923;&#36753;&#36816;&#31639;&#31526;&#25805;&#20316;<code>bitset</code>&#65292;&#24182;&#23558;&#23427;&#19982;&#23383;&#31526;&#20018;&#21644;&#25972;&#25968;&#30456;&#20114;&#36716;&#25442;&#12290;</p>
<p><code>bitset</code> &#28385;&#36275;<a href="cpp-named_req-CopyConstructible.html"><span style="font-style:italic">&#21487;&#22797;&#21046;&#26500;&#36896;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(CopyConstructible)</span></a> &#21450;<a href="cpp-named_req-CopyAssignable.html"><span style="font-style:italic">&#21487;&#22797;&#21046;&#36171;&#20540;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(CopyAssignable)</span></a> &#30340;&#35201;&#27714;&#12290;</p>
<h3><span class="mw-headline" id=".E6.A8.A1.E6.9D.BF.E5.BD.A2.E5.8F.82">&#27169;&#26495;&#24418;&#21442;</span></h3>
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<td>N</td>
<td>-</td>
<td>&#35201;&#20026; <code>bitset</code> &#20998;&#37197;&#23384;&#20648;&#30340;&#20301;&#25968;</td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">&#25104;&#21592;&#31867;&#22411;</span></h3>
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<div><a href="cpp-utility-bitset-reference.html"><span class="t-lines"><span>reference</span></span></a></div>
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<td>&#34920;&#31034;&#21040;&#19968;&#20010;&#20301;&#30340;&#24341;&#29992;&#30340;&#20195;&#29702;&#31867;<br />
<span class="t-mark">(&#31867;)</span></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">&#25104;&#21592;&#20989;&#25968;</span></h3>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
<div><a href="cpp-utility-bitset-bitset.html"><span class="t-lines"><span>(&#26500;&#36896;&#20989;&#25968;)</span></span></a></div>
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<td>&#26500;&#36896; bitset<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-bitset-operator_cmp.html"><span class="t-lines"><span>operator==</span><span>operator!=</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 &#20013;&#31227;&#38500;)</span></span></span></div>
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<td>&#27604;&#36739;&#20854;&#20869;&#23481;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<td colspan="2">
<h5><span class="mw-headline" id=".E5.85.83.E7.B4.A0.E8.AE.BF.E9.97.AE">&#20803;&#32032;&#35775;&#38382;</span></h5>
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<div><a href="cpp-utility-bitset-operator_at.html"><span class="t-lines"><span>operator[]</span></span></a></div>
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<td>&#35775;&#38382;&#25351;&#23450;&#30340;&#20301;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-bitset-test.html"><span class="t-lines"><span>test</span></span></a></div>
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<td>&#35775;&#38382;&#29305;&#23450;&#20301;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-bitset-all_any_none.html"><span class="t-lines"><span>all</span><span>any</span><span>none</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span>&nbsp;</span><span>&nbsp;</span></span></div>
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<td>&#26816;&#26597;&#26159;&#21542;&#25152;&#26377;&#12289;&#20219;&#19968;&#25110;&#26080;&#20301;&#34987;&#35774;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span><br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-utility-bitset-count.html"><span class="t-lines"><span>count</span></span></a></div>
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<td>&#36820;&#22238;&#35774;&#32622;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#30340;&#20301;&#30340;&#25968;&#37327;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<h5><span class="mw-headline" id=".E5.AE.B9.E9.87.8F">&#23481;&#37327;</span></h5>
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<div><a href="cpp-utility-bitset-size.html"><span class="t-lines"><span>size</span></span></a></div>
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<td>&#36820;&#22238;&#20301;&#38598;&#20445;&#26377;&#30340;&#20301;&#25968;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<h5><span class="mw-headline" id=".E4.BF.AE.E6.94.B9.E5.99.A8">&#20462;&#25913;&#22120;</span></h5>
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<div><a href="cpp-utility-bitset-operator_logic.html"><span class="t-lines"><span>operator&amp;=</span><span>operator|=</span><span>operator^=</span><span>operator~</span></span></a></div>
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<td>&#36827;&#34892;&#20108;&#36827;&#21046;&#19982;&#12289;&#25110;&#12289;&#24322;&#25110;&#21450;&#38750;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-utility-bitset-operator_ltltgtgt.html"><span class="t-lines"><span>operator&lt;&lt;=</span><span>operator&gt;&gt;=</span><span>operator&lt;&lt;</span><span>operator&gt;&gt;</span></span></a></div>
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<td>&#36827;&#34892;&#20108;&#36827;&#21046;&#24038;&#31227;&#21644;&#21491;&#31227;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-utility-bitset-set.html"><span class="t-lines"><span>set</span></span></a></div>
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<td>&#23558;&#20301;&#32622;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#25110;&#32773;&#25552;&#20379;&#30340;&#20540;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-bitset-reset.html"><span class="t-lines"><span>reset</span></span></a></div>
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<td>&#23558;&#20301;&#32622;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span><br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-bitset-flip.html"><span class="t-lines"><span>flip</span></span></a></div>
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<td>&#32763;&#36716;&#20301;&#30340;&#20540;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<td colspan="2">
<h5><span class="mw-headline" id=".E8.BD.AC.E6.8D.A2">&#36716;&#25442;</span></h5>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-bitset-to_string.html"><span class="t-lines"><span>to_string</span></span></a></div>
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<td>&#36820;&#22238;&#25968;&#25454;&#30340;&#23383;&#31526;&#20018;&#34920;&#31034;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-bitset-to_ulong.html"><span class="t-lines"><span>to_ulong</span></span></a></div>
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<td>&#36820;&#22238;&#25968;&#25454;&#30340; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">long</span></span></span> &#25972;&#25968;&#34920;&#31034;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-bitset-to_ullong.html"><span class="t-lines"><span>to_ullong</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>&#36820;&#22238;&#25968;&#25454;&#30340; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span></span></span> &#25972;&#25968;&#34920;&#31034;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">&#38750;&#25104;&#21592;&#20989;&#25968;</span></h3>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-bitset-operator_logic2.html"><span class="t-lines"><span>operator&amp;</span><span>operator|</span><span>operator^</span></span></a></div>
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<td>&#22312; bitset &#19978;&#25191;&#34892;&#20108;&#20803;&#36923;&#36753;&#25805;&#20316;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<td>
<div class="t-dsc-member-div">
<div><a href="cpp-utility-bitset-operator_ltltgtgt2.html"><span class="t-lines"><span>operator&lt;&lt;</span><span>operator&gt;&gt;</span></span></a></div>
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<td>&#25191;&#34892; bitset &#30340;&#27969;&#36755;&#20837;&#21644;&#36755;&#20986;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<h3><span class="mw-headline" id=".E8.BE.85.E5.8A.A9.E7.B1.BB">&#36741;&#21161;&#31867;</span></h3>
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<div><a href="cpp-utility-bitset-hash.html"><span class="t-lines"><span>std::hash<span class="t-dsc-small">&lt;std::bitset&gt;</span></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><span class="t-lc"><strong class="selflink">std::bitset</strong></span> &#30340;&#25955;&#21015;&#25903;&#25345;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;&#29305;&#21270;)</span></td>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#33509;&#22312;&#32534;&#35793;&#26102; bitset &#30340;&#22823;&#23567;&#26410;&#30693;&#65292;&#21017;&#21487;&#20351;&#29992; <a href="cpp-container-vector_bool.html"><tt>std::vector&lt;bool&gt;</tt></a> &#25110; <a rel="nofollow" class="external text" href="https://www.boost.org/doc/libs/release/libs/dynamic_bitset/dynamic_bitset.html"><code>boost::dynamic_bitset</code></a> &#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;bitset&gt;</span>
<span class="co2">#include &lt;cassert&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// &#26500;&#36896;&#20989;&#25968;&#65306;</span>
<span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">bitset</span><span class="sy1">&lt;</span><span class="nu0">4</span><span class="sy1">&gt;</span> b1<span class="sy4">;</span>
<span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">bitset</span><span class="sy1">&lt;</span><span class="nu0">4</span><span class="sy1">&gt;</span> b2<span class="br0">{</span><span class="nu12">0xA</span><span class="br0">}</span><span class="sy4">;</span> <span class="co1">// == 0B1010</span>
std<span class="sy4">::</span><span class="me2">bitset</span><span class="sy1">&lt;</span><span class="nu0">4</span><span class="sy1">&gt;</span> b3<span class="br0">{</span><span class="st0">&quot;0011&quot;</span><span class="br0">}</span><span class="sy4">;</span> <span class="co1">// &#23578;&#19981;&#33021;&#20026; constexpr</span>
std<span class="sy4">::</span><span class="me2">bitset</span><span class="sy1">&lt;</span><span class="nu0">8</span><span class="sy1">&gt;</span> b4<span class="br0">{</span><span class="st0">&quot;ABBA&quot;</span>, <span class="coMULTI">/*length*/</span><span class="nu0">4</span>, <span class="coMULTI">/*0:*/</span><span class="st0">&#39;A&#39;</span>, <span class="coMULTI">/*1:*/</span><span class="st0">&#39;B&#39;</span><span class="br0">}</span><span class="sy4">;</span> <span class="co1">// == 0B0000&#39;0110</span>
<span class="co1">// &#33021;&#25171;&#21360;&#20986; bitset &#21040;&#27969;&#65306;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;b1:&quot;</span> <span class="sy1">&lt;&lt;</span> b1 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;; b2:&quot;</span> <span class="sy1">&lt;&lt;</span> b2 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;; b3:&quot;</span> <span class="sy1">&lt;&lt;</span> b3 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;; b4:&quot;</span> <span class="sy1">&lt;&lt;</span> b4 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="co1">// bitset &#25903;&#25345;&#36880;&#20301;&#36816;&#31639;&#65306;</span>
b3 <span class="sy3">|</span><span class="sy1">=</span> <span class="nu6">0b0100</span><span class="sy4">;</span> <a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3 <span class="sy1">==</span> <span class="nu6">0b0111</span><span class="br0">)</span><span class="sy4">;</span>
b3 <span class="sy3">&amp;</span><span class="sy1">=</span> <span class="nu6">0b0011</span><span class="sy4">;</span> <a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3 <span class="sy1">==</span> <span class="nu6">0b0011</span><span class="br0">)</span><span class="sy4">;</span>
b3 <span class="sy3">^</span><span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">bitset</span><span class="sy1">&lt;</span><span class="nu0">4</span><span class="sy1">&gt;</span><span class="br0">{</span><span class="nu6">0b1100</span><span class="br0">}</span><span class="sy4">;</span> <a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3 <span class="sy1">==</span> <span class="nu6">0b1111</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#25972;&#20010;&#38598;&#21512;&#19978;&#30340;&#25805;&#20316;&#65306;</span>
b3.<span class="me1">reset</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3 <span class="sy1">==</span> <span class="nu0">0</span><span class="br0">)</span><span class="sy4">;</span>
b3.<span class="me1">set</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3 <span class="sy1">==</span> <span class="nu6">0b1111</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3.<span class="me1">all</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;&amp;</span> b3.<span class="me1">any</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;&amp;</span> <span class="sy3">!</span>b3.<span class="me1">none</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
b3.<span class="me1">flip</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3 <span class="sy1">==</span> <span class="nu0">0</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#21333;&#29420;&#20301;&#19978;&#30340;&#25805;&#20316;&#65306;</span>
b3.<span class="me1">set</span><span class="br0">(</span><span class="coMULTI">/* position = */</span> <span class="nu0">1</span>, <span class="kw2">true</span><span class="br0">)</span><span class="sy4">;</span> <a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3 <span class="sy1">==</span> <span class="nu6">0b0010</span><span class="br0">)</span><span class="sy4">;</span>
b3.<span class="me1">set</span><span class="br0">(</span><span class="coMULTI">/* position = */</span> <span class="nu0">1</span>, <span class="kw2">false</span><span class="br0">)</span><span class="sy4">;</span> <a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3 <span class="sy1">==</span> <span class="nu0">0</span><span class="br0">)</span><span class="sy4">;</span>
b3.<span class="me1">flip</span><span class="br0">(</span><span class="coMULTI">/* position = */</span> <span class="nu0">2</span><span class="br0">)</span><span class="sy4">;</span> <a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3 <span class="sy1">==</span> <span class="nu6">0b0100</span><span class="br0">)</span><span class="sy4">;</span>
b3.<span class="me1">reset</span><span class="br0">(</span><span class="coMULTI">/* position = */</span> <span class="nu0">2</span><span class="br0">)</span><span class="sy4">;</span> <a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3 <span class="sy1">==</span> <span class="nu0">0</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#25903;&#25345;&#19979;&#26631; operator[] &#65306;</span>
b3<span class="br0">[</span><span class="nu0">2</span><span class="br0">]</span> <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span> <a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span><span class="kw2">true</span> <span class="sy1">==</span> b3<span class="br0">[</span><span class="nu0">2</span><span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#20854;&#20182;&#25805;&#20316;&#65306;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">4</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3.<span class="me1">to_ullong</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> 0b0100ULL<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>b3.<span class="me1">to_string</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="st0">&quot;0100&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">b1:0000; b2:1010; b3:0011; b4:00000110</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-container-vector_bool.html"><span class="t-lines"><span>vector<span class="t-dsc-small">&lt;bool&gt;</span></span></span></a></div>
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</td>
<td>&#33410;&#30465;&#31354;&#38388;&#30340;&#21160;&#24577; bitset<br />
<span class="t-mark">(&#31867;&#27169;&#26495;&#29305;&#21270;)</span></td>
</tr>
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<td><a href="cpp-numeric.html#.E4.BD.8D.E6.93.8D.E7.BA.B5_.28C.2B.2B20_.E8.B5.B7.29"><b>&#20301;&#25805;&#32437;</b></a> <span class="t-mark-rev t-since-cxx20">(C++20)</span></td>
<td>&#29992;&#20110;&#35775;&#38382;&#12289;&#25805;&#32437;&#21644;&#22788;&#29702;&#21333;&#29420;&#30340;&#20301;&#21644;&#20301;&#24207;&#21015;&#30340;&#24037;&#20855;</td>
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