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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>less_equal&lt;void&gt;</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>&lrm; | <a href="cpp-utility-functional.html">functional</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-functional.html">&lt;functional&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;&gt;</span><br />
<span class="kw1">class</span> less_equal<span class="sy1">&lt;</span><span class="kw4">void</span><span class="sy1">&gt;</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span></td>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-less_equal.html"><span class="kw1040">std::<span class="me2">less_equal</span></span></a><span class="sy1">&lt;&gt;</span></span></span> &#26159; <span class="t-lc"><a href="cpp-utility-functional-less_equal.html">std::less_equal</a></span> &#30340;&#29305;&#21270;&#65292;&#25317;&#26377;&#24453;&#25512;&#23548;&#30340;&#21442;&#25968;&#21644;&#36820;&#22238;&#31867;&#22411;&#12290;</p>
<h3><span class="mw-headline" id=".E5.AE.9E.E7.8E.B0.E5.AE.9A.E4.B9.89.E7.9A.84.E6.8C.87.E9.92.88.E4.B8.8A.E7.9A.84.E4.B8.A5.E6.A0.BC.E5.85.A8.E5.BA.8F">&#23454;&#29616;&#23450;&#20041;&#30340;&#25351;&#38024;&#19978;&#30340;&#20005;&#26684;&#20840;&#24207;</span></h3>
<p>&#33509;&#21442;&#25968;&#38388;&#30340; <code>&lt;=</code> &#36816;&#31639;&#31526;&#35843;&#29992;&#25351;&#38024;&#30340;&#20869;&#24314;&#27604;&#36739;&#36816;&#31639;&#31526;&#65292;&#21017;&#20989;&#25968;&#35843;&#29992;&#36816;&#31639;&#31526;&#20135;&#29983;&#23454;&#29616;&#23450;&#20041;&#30340;&#25351;&#38024;&#19978;&#30340;&#20005;&#26684;&#20840;&#24207;&#65292;&#21363;&#20351;&#20869;&#24314;&#30340; <code>&lt;=</code> &#36816;&#31639;&#31526;&#19981;&#22914;&#27492;&#12290;</p>
<p>&#23454;&#29616;&#23450;&#20041;&#30340;&#20005;&#26684;&#20840;&#24207;&#19982;&#27604;&#36739;&#36816;&#31639;&#31526;&#65288; <span class="t-rev-inl t-since-cxx20"><span><code>&lt;=&gt;</code>&#12289;</span> <span><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></span></span><code>&lt;</code>&#12289; <code>&gt;</code>&#12289; <code>&lt;=</code> &#21450; <code>&gt;=</code> &#65289;&#25152;&#26045;&#21152;&#30340;&#20559;&#24207;&#19968;&#33268;&#65292;&#24182;&#22312;&#19979;&#21015;&#26631;&#20934;&#20989;&#25968;&#23545;&#35937;&#38388;&#19968;&#33268;&#65306;</p>
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<li><span class="t-lc"><a href="cpp-utility-functional-less.html">std::less</a></span>&#12289; <span class="t-lc"><a href="cpp-utility-functional-greater.html">std::greater</a></span>&#12289; <span class="t-lc"><a href="cpp-utility-functional-less_equal.html">std::less_equal</a></span> &#21450; <span class="t-lc"><a href="cpp-utility-functional-greater_equal.html">std::greater_equal</a></span> &#65292;&#24403;&#27169;&#26495;&#23454;&#21442;&#20026;&#25351;&#38024;&#31867;&#22411;&#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span></span></span> &#26102;</li>
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<li><a href="cpp-utility-functional-ranges-equal_to.html"><tt>std::ranges::equal_to</tt></a>&#12289; <a href="cpp-utility-functional-ranges-not_equal_to.html"><tt>std::ranges::not_equal_to</tt></a>&#12289; <a href="cpp-utility-functional-ranges-less.html"><tt>std::ranges::less</tt></a>&#12289; <a href="cpp-utility-functional-ranges-greater.html"><tt>std::ranges::greater</tt></a>&#12289; <a href="cpp-utility-functional-ranges-less_equal.html"><tt>std::ranges::less_equal</tt></a>&#12289; <a href="cpp-utility-functional-ranges-greater_equal.html"><tt>std::ranges::greater_equal</tt></a> &#21450; <span class="t-lc">std::compare_three_way</span></li>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></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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<td>&#25104;&#21592;&#31867;&#22411;</td>
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<td><code>is_transparent</code></td>
<td>/* &#26410;&#25351;&#23450; */</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><strong class="selflink"><span class="t-lines"><span>operator()</span></span></strong></div>
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<td>&#27979;&#35797; lhs &#26159;&#21542;&#27604;&#36739;&#23567;&#20110;&#25110;&#31561;&#20110; rhs<br />
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<h2><span class="mw-headline" id="std::less_equal.3C.3E::operator.28.29"><span style="font-size:0.7em; line-height:130%">std::less_equal&lt;&gt;::</span>operator()</span></h2>
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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><span class="kw4">constexpr</span> <span class="kw4">auto</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span> T<span class="sy3">&amp;&amp;</span> lhs, U<span class="sy3">&amp;&amp;</span> rhs <span class="br0">)</span> <span class="kw4">const</span><br /></p>
&nbsp; <span class="sy2">-</span><span class="sy1">&gt;</span> decltype<span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span>lhs<span class="br0">)</span> <span class="sy1">&lt;=</span> <a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>U<span class="sy1">&gt;</span><span class="br0">(</span>rhs<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></div>
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<p>&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span>lhs<span class="br0">)</span> <span class="sy1">&lt;=</span> <a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>U<span class="sy1">&gt;</span><span class="br0">(</span>rhs<span class="br0">)</span></span></span> &#30340;&#32467;&#26524;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>lhs, rhs</td>
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<td>&#35201;&#27604;&#36739;&#30340;&#20540;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span>lhs<span class="br0">)</span> <span class="sy1">&lt;=</span> <a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>U<span class="sy1">&gt;</span><span class="br0">(</span>rhs<span class="br0">)</span></span></span> &#30340;&#32467;&#26524;&#12290;</p>
<p>&#33509;&#20004;&#20010;&#23454;&#21442;&#30340;&#27604;&#36739;&#35299;&#26512;&#21040;&#25351;&#38024;&#31867;&#22411;&#30340;&#20869;&#24314;&#27604;&#36739;&#36816;&#31639;&#31526;&#65292;&#21017;&#22312;&#36716;&#25442;&#20004;&#20010;&#23454;&#21442;&#21040;&#25351;&#38024;&#21518;&#29992;&#23454;&#29616;&#23450;&#20041;&#30340;&#20005;&#26684;&#20840;&#24207;&#36827;&#34892;&#27604;&#36739;&#12290;</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#21487;&#33021;&#25243;&#20986;&#23454;&#29616;&#23450;&#20041;&#30340;&#24322;&#24120;&#12290;</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#25104;&#21592;&#31867;&#22411; <code>is_transparent</code> &#25351;&#31034;&#35843;&#29992;&#26041;&#65292;&#27492;&#20989;&#25968;&#23545;&#35937;&#26159;&#19968;&#20010;<i>&#36890;&#36879;</i>&#20989;&#25968;&#23545;&#35937;&#65306;&#23427;&#25509;&#21463;&#20219;&#24847;&#31867;&#22411;&#30340;&#21442;&#25968;&#24182;&#20351;&#29992;&#23436;&#32654;&#36716;&#21457;&#65292;&#36825;&#22312;&#23558;&#20989;&#25968;&#23545;&#35937;&#22312;&#22810;&#31181;&#35821;&#22659;&#20013;&#65292;&#25110;&#20197;&#21491;&#20540;&#21442;&#25968;&#20351;&#29992;&#26102;&#65292;&#36991;&#20813;&#19981;&#38656;&#35201;&#30340;&#22797;&#21046;&#21644;&#36716;&#25442;&#12290;&#29305;&#21035;&#26159;&#65292;&#35832;&#22914; <span class="t-lc"><a href="cpp-container-set-find.html">std::set::find</a></span> &#21644; <span class="t-lc"><a href="cpp-container-set-lower_bound.html">std::set::lower_bound</a></span> &#30340;&#27169;&#26495;&#20989;&#25968;&#22312;&#20854; <code>Compare</code> &#31867;&#22411;&#19978;&#20351;&#29992;&#27492;&#31867;&#22411;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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