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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>unary_negate</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;</span> <span class="kw1">class</span> Predicate <span class="sy1">&gt;</span><br />
<span class="kw1">struct</span> unary_negate <span class="sy4">:</span> <span class="kw1">public</span> <a href="cpp-utility-functional-unary_function.html"><span class="kw1124">std::<span class="me2">unary_function</span></span></a><span class="sy1">&lt;</span>Predicate<span class="sy4">::</span><span class="me2">argument_type</span>, <span class="kw4">bool</span><span class="sy1">&gt;</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 &#21069;)</span></td>
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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> Predicate <span class="sy1">&gt;</span><br />
<span class="kw1">struct</span> unary_negate<span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<span class="t-mark">(C++17 &#20013;&#24323;&#29992;)</span><br />
<span class="t-mark-rev t-until-cxx20">(C++20 &#20013;&#31227;&#38500;)</span></td>
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<p><code>unary_negate</code> &#26159;&#36820;&#22238;&#20854;&#25152;&#20445;&#26377;&#30340;&#19968;&#20803;&#35859;&#35789;&#30340;&#36923;&#36753;&#34917;&#30340;&#21253;&#35013;&#20989;&#25968;&#23545;&#35937;&#12290;</p>
<p>&#19968;&#20803;&#35859;&#35789;&#24517;&#39035;&#23450;&#20041;&#25104;&#21592;&#31867;&#22411; <code>argument_type</code> &#65292;&#23427;&#35201;&#21487;&#36716;&#25442;&#20026;&#35859;&#35789;&#30340;&#21442;&#25968;&#31867;&#22411;&#12290;&#20174; <span class="t-lc"><a href="cpp-utility-functional-ref.html">std::ref</a></span> &#12289; <span class="t-lc"><a href="cpp-utility-functional-ref.html">std::cref</a></span> &#12289; <span class="t-lc"><a href="cpp-utility-functional-negate.html">std::negate</a></span> &#12289; <span class="t-lc"><a href="cpp-utility-functional-logical_not.html">std::logical_not</a></span> &#12289; <span class="t-lc"><a href="cpp-utility-functional-mem_fn.html">std::mem_fn</a></span> &#12289; <span class="t-lc"><a href="cpp-utility-functional-function.html">std::function</a></span> &#12289; <span class="t-lc"><a href="cpp-utility-hash.html">std::hash</a></span> &#25110;&#35843;&#29992; <span class="t-lc"><a href="cpp-utility-functional-not1.html">std::not1</a></span> &#33719;&#24471;&#30340;&#19968;&#20803;&#20989;&#25968;&#23545;&#35937;&#24050;&#23450;&#20041;&#27492;&#31867;&#22411;&#65292;&#23548;&#20986;&#33258;&#21551;&#29992;&#30340; <span class="t-lc"><a href="cpp-utility-functional-unary_function.html">std::unary_function</a></span> &#30340;&#20989;&#25968;&#23545;&#35937;&#20134;&#28982;&#12290;</p>
<p><code>unary_negate</code> &#31616;&#21333;&#22320;&#20197;&#36741;&#21161;&#20989;&#25968; <span class="t-lc"><a href="cpp-utility-functional-not1.html">std::not1</a></span> &#26500;&#36896;&#12290;</p>
<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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<td>&#31867;&#22411;</td>
<td>&#23450;&#20041;</td>
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<td><code>argument_type</code></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">Predicate<span class="sy4">::</span><span class="me2">argument_type</span></span></span></td>
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<td><code>result_type</code></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span></span></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0_2">&#25104;&#21592;&#20989;&#25968;</span></h3>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
<div><span class="t-lines"><span>(&#26500;&#36896;&#20989;&#25968;)</span></span></div>
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<td>&#20197;&#25552;&#20379;&#30340;&#35859;&#35789;&#26500;&#36896;&#26032;&#30340; unary_negate &#23545;&#35937;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><span class="t-lines"><span>operator()</span></span></div>
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<td>&#36820;&#22238;&#35843;&#29992;&#23384;&#20648;&#30340;&#35859;&#35789;&#32467;&#26524;&#30340;&#36923;&#36753;&#34917;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<h2><span class="mw-headline" id="std::unary_negate::unary_negate"><span style="font-size:0.7em; line-height:130%">std::unary_negate::</span>unary_negate</span></h2>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> unary_negate<span class="br0">(</span> Predicate <span class="kw4">const</span><span class="sy3">&amp;</span> pred <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx14">(C++14 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> <span class="kw4">constexpr</span> unary_negate<span class="br0">(</span> Predicate <span class="kw4">const</span><span class="sy3">&amp;</span> pred <span class="br0">)</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>&#20197;&#23384;&#20648;&#30340;&#35859;&#35789; <code>pred</code> &#26500;&#36896; <code>unary_negate</code> &#20989;&#25968;&#23545;&#35937;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>pred</td>
<td>-</td>
<td>&#35859;&#35789;&#20989;&#25968;&#23545;&#35937;</td>
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<h2><span class="mw-headline" id="std::unary_negate::operator.28.29"><span style="font-size:0.7em; line-height:130%">std::unary_negate::</span>operator()</span></h2>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span> argument_type <span class="kw4">const</span><span class="sy3">&amp;</span> x <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx14">(C++14 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span> argument_type <span class="kw4">const</span><span class="sy3">&amp;</span> x <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span></td>
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<p>&#36820;&#22238;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">pred<span class="br0">(</span>x<span class="br0">)</span></span></span> &#32467;&#26524;&#30340;&#36923;&#36753;&#34917;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0_2">&#21442;&#25968;</span></h3>
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<td>x</td>
<td>-</td>
<td>&#20256;&#36882;&#32473;&#35859;&#35789;&#30340;&#21442;&#25968;</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>&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">pred<span class="br0">(</span>x<span class="br0">)</span></span></span> &#32467;&#26524;&#30340;&#36923;&#36753;&#34917;&#12290;</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
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<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;algorithm&gt;</span>
<span class="co2">#include &lt;functional&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;vector&gt;</span>
<span class="kw1">struct</span> less_than_7 <span class="sy4">:</span> <a href="cpp-utility-functional-unary_function.html"><span class="kw1124">std::<span class="me2">unary_function</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span>, <span class="kw4">bool</span><span class="sy1">&gt;</span>
<span class="br0">{</span>
<span class="kw4">bool</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span><span class="kw4">int</span> i<span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span> <span class="kw1">return</span> i <span class="sy1">&lt;</span> <span class="nu0">7</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-container-vector.html"><span class="kw1268">std::<span class="me2">vector</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> v<span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">int</span> i <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> i <span class="sy1">&lt;</span> <span class="nu0">10</span><span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span> v.<span class="me1">push_back</span><span class="br0">(</span>i<span class="br0">)</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">unary_negate</span><span class="sy1">&lt;</span>less_than_7<span class="sy1">&gt;</span> not_less_than_7<span class="br0">(</span><span class="br0">(</span>less_than_7<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <a href="cpp-algorithm-count_if.html"><span class="kw1570">std::<span class="me2">count_if</span></span></a><span class="br0">(</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, v.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, not_less_than_7<span class="br0">)</span><span class="sy4">;</span>
<span class="coMULTI">/* C++11 &#35299;&#27861;&#65306;
// &#29992; std::function&lt;bool (int)&gt;
std::function&lt;bool (int)&gt; not_less_than_7 =
[](int x)-&gt;bool{ return !less_than_7()(x); };
std::cout &lt;&lt; std::count_if(v.begin(), v.end(), not_less_than_7);
*/</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
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<div class="text source-text">
<pre class="de1">3</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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<td>
<div class="t-dsc-member-div">
<div><a href="cpp-utility-functional-binary_negate.html"><span class="t-lines"><span>binary_negate</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx17">(C++17 &#20013;&#24323;&#29992;)</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>&#21253;&#35013;&#22120;&#20989;&#25968;&#23545;&#35937;&#65292;&#36820;&#22238;&#25152;&#25345;&#26377;&#30340;&#20108;&#20803;&#35859;&#35789;&#30340;&#34917;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
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<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-utility-functional-function.html"><span class="t-lines"><span>function</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>&#21253;&#35013;&#20855;&#26377;&#25351;&#23450;&#20989;&#25968;&#35843;&#29992;&#31614;&#21517;&#30340;&#20219;&#24847;&#21487;&#22797;&#21046;&#26500;&#36896;&#31867;&#22411;&#30340;&#21487;&#35843;&#29992;&#23545;&#35937;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
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<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-utility-functional-not1.html"><span class="t-lines"><span>not1</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx17">(C++17 &#20013;&#24323;&#29992;)</span><span class="t-mark-rev t-until-cxx20">(C++20 &#20013;&#31227;&#38500;)</span></span></span></div>
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<td>&#26500;&#36896;&#23450;&#21046;&#30340; <span class="t-lc"><strong class="selflink">std::unary_negate</strong></span> &#23545;&#35937;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-functional-ptr_fun.html"><span class="t-lines"><span>ptr_fun</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx11">(C++11 &#20013;&#24323;&#29992;)</span><span class="t-mark-rev t-until-cxx17">(C++17 &#20013;&#31227;&#38500;)</span></span></span></div>
</div>
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<td>&#20174;&#20989;&#25968;&#25351;&#38024;&#21019;&#24314;&#19982;&#36866;&#37197;&#22120;&#20860;&#23481;&#30340;&#20989;&#25968;&#23545;&#35937;&#21253;&#35013;&#22120;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<td>
<div class="t-dsc-member-div">
<div><a href="cpp-utility-functional-unary_function.html"><span class="t-lines"><span>unary_function</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx11">(C++11 &#20013;&#24323;&#29992;)</span></span><span><span class="t-mark-rev t-until-cxx17">(C++17 &#20013;&#31227;&#38500;)</span></span></span></div>
</div>
</td>
<td>&#19982;&#36866;&#37197;&#22120;&#20860;&#23481;&#30340;&#19968;&#20803;&#20989;&#25968;&#22522;&#31867;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
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<div class="visualClear"></div>
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