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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>partial_order</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-compare.html">&lt;compare&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">inline</span> <span class="kw1">namespace</span> <span class="coMULTI">/* unspecified */</span> <span class="br0">{</span><br /></span>
<p>&nbsp; &nbsp; <span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* unspecified */</span> partial_order <span class="sy1">=</span> <span class="coMULTI">/* unspecified */</span><span class="sy4">;</span><br /></p>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div>&#35843;&#29992;&#31614;&#21517;</div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T, <span class="kw1">class</span> U <span class="sy1">&gt;</span><br /></span>
<p>&nbsp; &nbsp; requires <span class="coMULTI">/* see below */</span><br />
<span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">partial_ordering</span><br /></p>
&nbsp; &nbsp; partial_order<span class="br0">(</span>T<span class="sy3">&amp;&amp;</span> t, U<span class="sy3">&amp;&amp;</span> u<span class="br0">)</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="coMULTI">/* see below */</span><span class="br0">)</span><span class="sy4">;</span></div>
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<p>&#29992;&#19977;&#36335;&#27604;&#36739;&#27604;&#36739;&#20108;&#20010;&#20540;&#24182;&#20135;&#29983; <span class="t-lc">std::partial_ordering</span> &#31867;&#22411;&#32467;&#26524;&#12290;</p>
<p>&#35774; <code>t</code> &#19982; <code>u</code> &#20026;&#34920;&#36798;&#24335;&#32780; <code>T</code> &#19982; <code>U</code> &#20998;&#21035;&#20195;&#34920; <span class="t-c"><span class="mw-geshi cpp source-cpp">decltype<span class="br0">(</span><span class="br0">(</span>t<span class="br0">)</span><span class="br0">)</span></span></span> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">decltype<span class="br0">(</span><span class="br0">(</span>u<span class="br0">)</span><span class="br0">)</span></span></span> &#65292;&#21017; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">partial_order</span><span class="br0">(</span>t, u<span class="br0">)</span></span></span> &#34920;&#36798;&#24335;&#31561;&#20215;&#20110;&#65306;</p>
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<li>&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_same.html"><span class="kw589">std::<span class="me2">is_same_v</span></span></a><span class="sy1">&lt;</span><a href="cpp-types-decay.html"><span class="kw629">std::<span class="me2">decay_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span>, <a href="cpp-types-decay.html"><span class="kw629">std::<span class="me2">decay_t</span></span></a><span class="sy1">&lt;</span>U<span class="sy1">&gt;&gt;</span></span></span> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#65306;
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">partial_ordering</span><span class="br0">(</span>partial_order<span class="br0">(</span>t, u<span class="br0">)</span><span class="br0">)</span></span></span> &#65292;&#33509;&#23427;&#22312;&#19981;&#21253;&#21547; <code>std::partial_order</code> &#30340;&#22768;&#26126;&#30340;&#35821;&#22659;&#20013;&#36827;&#34892;&#37325;&#36733;&#20915;&#35758;&#30340;&#24773;&#20917;&#19979;&#20026;&#33391;&#26500;&#30340;&#34920;&#36798;&#24335;&#65292;</li>
<li>&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">partial_ordering</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">compare_three_way</span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>t, u<span class="br0">)</span><span class="br0">)</span></span></span> &#65292;&#33509;&#23427;&#20026;&#33391;&#26500;&#65292;</li>
<li>&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">partial_ordering</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">weak_order</span><span class="br0">(</span>t, u<span class="br0">)</span><span class="br0">)</span></span></span> &#65292;&#33509;&#23427;&#20026;&#33391;&#26500;&#12290;</li>
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<li>&#25152;&#26377;&#20854;&#20182;&#24773;&#20917;&#19979;&#65292;&#35813;&#34920;&#36798;&#24335;&#20026;&#38750;&#33391;&#26500;&#65292;&#36825;&#33021;&#22312;&#20986;&#29616;&#20110;&#27169;&#26495;&#23454;&#20363;&#21270;&#30340;&#31435;&#21363;&#35821;&#22659;&#26102;&#23548;&#33268;<a href="cpp-language-sfinae.html">&#26367;&#25442;&#22833;&#36133;</a>&#12290;</li>
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<h3><span class="mw-headline" id=".E8.A1.A8.E8.BE.BE.E5.BC.8F.E7.AD.89.E4.BB.B7">&#34920;&#36798;&#24335;&#31561;&#20215;</span></h3>
<p>&#34920;&#36798;&#24335; <span class="t-c"><span class="mw-geshi cpp source-cpp">e</span></span> <i>&#34920;&#36798;&#24335;&#31561;&#20215;</i>&#20110;&#34920;&#36798;&#24335; <span class="t-c"><span class="mw-geshi cpp source-cpp">f</span></span> &#65292;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">e</span></span> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">f</span></span> &#25317;&#26377;&#30456;&#21516;&#25928;&#26524;&#65292;&#22343;&#20026;<a href="cpp-language-noexcept_spec.html">&#28508;&#22312;&#25243;&#20986;</a>&#25110;&#22343;&#38750;&#28508;&#22312;&#25243;&#20986;&#65288;&#21363; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">noexcept</span><span class="br0">(</span>e<span class="br0">)</span> <span class="sy1">==</span> <span class="kw1">noexcept</span><span class="br0">(</span>f<span class="br0">)</span></span></span> &#65289;&#65292;&#19988;&#22343;&#20026;<a href="cpp-language-constant_expression.html">&#24120;&#37327;&#23376;&#34920;&#36798;&#24335;</a>&#25110;&#22343;&#38750;&#24120;&#37327;&#23376;&#34920;&#36798;&#24335;&#12290;</p>
<h3><span class="mw-headline" id=".E5.AE.9A.E5.88.B6.E7.82.B9.E5.AF.B9.E8.B1.A1">&#23450;&#21046;&#28857;&#23545;&#35937;</span></h3>
<p>&#21517;&#23383; <code>std::partial_order</code> &#20195;&#34920;&#19968;&#20010;<i>&#23450;&#21046;&#28857;&#23545;&#35937;</i>&#65292;&#23427;&#26159;<a href="cpp-named_req-LiteralType.html">&#23383;&#38754;</a> <a href="cpp-concepts-semiregular.html"><code>semiregular</code></a> &#31867;&#31867;&#22411;&#30340; const <a href="cpp-named_req-FunctionObject.html">&#20989;&#25968;&#23545;&#35937;</a>&#12290;&#20026;&#35828;&#26126;&#30446;&#30340;&#65292;&#20197; <code><i>__partial_order_fn</i></code> &#34920;&#31034;&#20854;&#31867;&#22411;&#30340; cv &#26080;&#38480;&#23450;&#29256;&#26412;&#12290;</p>
<p><code><i>__partial_order_fn</i></code> &#30340;&#25152;&#26377;&#23454;&#20363;&#22343;&#30456;&#31561;&#12290;&#22312;&#30456;&#21516;&#21442;&#25968;&#19978;&#35843;&#29992;&#31867;&#22411; <code><i>__partial_order_fn</i></code> &#30340;&#19981;&#21516;&#23454;&#20363;&#30340;&#25928;&#26524;&#26159;&#31561;&#20215;&#30340;&#65292;&#26080;&#20851;&#20046;&#25351;&#20195;&#35813;&#23454;&#20363;&#30340;&#34920;&#36798;&#24335;&#26159;&#24038;&#20540;&#36824;&#26159;&#21491;&#20540;&#65292;&#20197;&#21450;&#26159;&#21542;&#20026; const &#38480;&#23450;&#65288;&#28982;&#32780;&#19981;&#35201;&#27714; volatile &#38480;&#23450;&#30340;&#23454;&#20363;&#21487;&#35843;&#29992;&#65289;&#12290;&#20174;&#32780;&#33021;&#33258;&#30001;&#22320;&#22797;&#21046; <code>std::partial_order</code> &#24182;&#19988;&#33021;&#24444;&#27492;&#26367;&#20195;&#22320;&#20351;&#29992;&#20854;&#21103;&#26412;&#12290;</p>
<p>&#32473;&#23450;&#31867;&#22411;&#38598;&#21512; <code>Args...</code> &#65292;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-declval.html"><span class="kw1120">std::<span class="me2">declval</span></span></a><span class="sy1">&lt;</span>Args<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span>...</span></span> &#28385;&#36275;&#19978;&#38754;&#23545;&#20110; <code>std::partial_order</code> &#30340;&#21442;&#25968;&#35201;&#27714;&#65292;&#21017; <code><i>__partial_order_fn</i></code> &#23454;&#29616; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">invocable</span><span class="sy1">&lt;</span>__partial_order_fn, Args...<span class="sy1">&gt;</span></span></span>&#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">invocable</span><span class="sy1">&lt;</span><span class="kw4">const</span> __partial_order_fn, Args...<span class="sy1">&gt;</span></span></span>&#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">invocable</span><span class="sy1">&lt;</span>__partial_order_fn<span class="sy3">&amp;</span>, Args...<span class="sy1">&gt;</span></span></span> &#21450; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">invocable</span><span class="sy1">&lt;</span><span class="kw4">const</span> __partial_order_fn<span class="sy3">&amp;</span>, Args...<span class="sy1">&gt;</span></span></span> &#12290;&#21542;&#21017;&#65292; <code><i>__partial_order_fn</i></code> &#30340;&#20989;&#25968;&#35843;&#29992;&#36816;&#31639;&#31526;&#19981;&#21442;&#19982;&#37325;&#36733;&#20915;&#35758;&#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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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-utility-compare-partial_ordering.html"><span class="t-lines"><span>partial_ordering</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#19977;&#36335;&#27604;&#36739;&#30340;&#32467;&#26524;&#31867;&#22411;&#65292;&#25903;&#25345;&#25152;&#26377; 6 &#31181;&#36816;&#31639;&#31526;&#65292;&#19981;&#21487;&#26367;&#25442;&#65292;&#24182;&#20801;&#35768;&#19981;&#21487;&#27604;&#36739;&#30340;&#20540;<br />
<span class="t-mark">(&#31867;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-compare-strong_order.html"><span class="t-lines"><span>strong_order</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#36827;&#34892;&#19977;&#36335;&#27604;&#36739;&#24182;&#20135;&#29983; <code>std::strong_ordering</code> &#31867;&#22411;&#32467;&#26524;<br />
<span class="t-mark">(&#23450;&#21046;&#28857;&#23545;&#35937;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-compare-weak_order.html"><span class="t-lines"><span>weak_order</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#36827;&#34892;&#19977;&#36335;&#27604;&#36739;&#24182;&#20135;&#29983; <code>std::weak_ordering</code> &#31867;&#22411;&#32467;&#26524;<br />
<span class="t-mark">(&#23450;&#21046;&#28857;&#23545;&#35937;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-compare-compare_partial_order_fallback.html"><span class="t-lines"><span>compare_partial_order_fallback</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#36827;&#34892;&#19977;&#36335;&#27604;&#36739;&#24182;&#20135;&#29983; <code>std::partial_ordering</code> &#31867;&#22411;&#30340;&#32467;&#26524;&#65292;&#21363;&#20351; <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy1">&lt;=&gt;</span></span></span> &#19981;&#21487;&#29992;<br />
<span class="t-mark">(&#23450;&#21046;&#28857;&#23545;&#35937;)</span></td>
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