222 lines
24 KiB
HTML
222 lines
24 KiB
HTML
<!DOCTYPE html>
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<title>std::not2</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_utility_functional_not2 skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>not2</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-utility.html">utility</a>‎ | <a href="cpp-utility-functional.html">functional</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-functional.html"><functional></a></code></div>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Predicate <span class="sy1">></span><br />
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<a href="cpp-utility-functional-binary_negate.html"><span class="kw1048">std::<span class="me2">binary_negate</span></span></a><span class="sy1"><</span>Predicate<span class="sy1">></span> not2<span class="br0">(</span><span class="kw4">const</span> Predicate<span class="sy3">&</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 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Predicate <span class="sy1">></span><br />
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<span class="kw4">constexpr</span> <a href="cpp-utility-functional-binary_negate.html"><span class="kw1048">std::<span class="me2">binary_negate</span></span></a><span class="sy1"><</span>Predicate<span class="sy1">></span> not2<span class="br0">(</span><span class="kw4">const</span> Predicate<span class="sy3">&</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 起)</span><br />
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<span class="t-mark">(C++17 中弃用)</span><br />
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<span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></td>
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<p><code>not2</code> 是创建函数对象的帮助函数，它返回传递的二元谓词函数的补。创建的函数对象拥有 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-binary_negate.html"><span class="kw1048">std::<span class="me2">binary_negate</span></span></a><span class="sy1"><</span>Predicate<span class="sy1">></span></span></span> 类型。</p>
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<p>二元谓词类型必须定义二个成员类型， <code>first_argument_type</code> 和 <code>second_argument_type</code> ，可转换为谓词参数类型。从 <span class="t-lc"><a href="cpp-memory-owner_less.html">std::owner_less</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-ref.html">std::ref</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-ref.html">std::cref</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-plus.html">std::plus</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-minus.html">std::minus</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-multiplies.html">std::multiplies</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-divides.html">std::divides</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-modulus.html">std::modulus</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-equal_to.html">std::equal_to</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-not_equal_to.html">std::not_equal_to</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-greater.html">std::greater</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-less.html">std::less</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-greater_equal.html">std::greater_equal</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-less_equal.html">std::less_equal</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-logical_not.html">std::logical_not</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-logical_or.html">std::logical_or</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-bit_and.html">std::bit_and</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-bit_or.html">std::bit_or</a></span> 、 <span class="t-lc">std::bit_xor</span> 、 <span class="t-lc"><a href="cpp-utility-functional-mem_fn.html">std::mem_fn</a></span> 、 <span class="t-lc"><a href="cpp-container-map-value_comp.html">std::map::value_comp</a></span> 、 <span class="t-lc"><a href="cpp-container-multimap-value_comp.html">std::multimap::value_comp</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-function.html">std::function</a></span> 或对 <span class="t-lc"><strong class="selflink">std::not2</strong></span> 调用获得的函数对象定义这些类型，和导出自弃用的 <span class="t-lc"><a href="cpp-utility-functional-binary_function.html">std::binary_function</a></span> 的函数对象一样。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>pred</td>
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<td>-</td>
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<td>二元谓词</td>
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</tr>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p><code>std::not2</code> 返回以 <code>pred</code> 构造的 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-binary_negate.html"><span class="kw1048">std::<span class="me2">binary_negate</span></span></a><span class="sy1"><</span>Predicate<span class="sy1">></span></span></span> 类型对象。</p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>无。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <algorithm></span>
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<span class="co2">#include <functional></span>
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<span class="co2">#include <iostream></span>
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<span class="co2">#include <vector></span>
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<span class="kw1">struct</span> old_same <span class="sy4">:</span> <a href="cpp-utility-functional-binary_function.html"><span class="kw1125">std::<span class="me2">binary_function</span></span></a><span class="sy1"><</span><span class="kw4">int</span>, <span class="kw4">int</span>, <span class="kw4">bool</span><span class="sy1">></span>
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<span class="br0">{</span>
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<span class="kw4">bool</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span><span class="kw4">int</span> a, <span class="kw4">int</span> b<span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span> <span class="kw1">return</span> a <span class="sy1">==</span> b<span class="sy4">;</span> <span class="br0">}</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw1">struct</span> new_same
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<span class="br0">{</span>
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<span class="kw4">bool</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span><span class="kw4">int</span> a, <span class="kw4">int</span> b<span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span> <span class="kw1">return</span> a <span class="sy1">==</span> b<span class="sy4">;</span> <span class="br0">}</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw4">bool</span> same_fn<span class="br0">(</span><span class="kw4">int</span> a, <span class="kw4">int</span> b<span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw1">return</span> a <span class="sy1">==</span> b<span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-container-vector.html"><span class="kw1268">std::<span class="me2">vector</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> v1<span class="br0">{</span><span class="nu0">0</span>, <span class="nu0">1</span>, <span class="nu0">2</span><span class="br0">}</span><span class="sy4">;</span>
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<a href="cpp-container-vector.html"><span class="kw1268">std::<span class="me2">vector</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> v2<span class="br0">{</span><span class="nu0">2</span>, <span class="nu0">1</span>, <span class="nu0">0</span><span class="br0">}</span><span class="sy4">;</span>
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<a href="cpp-container-vector.html"><span class="kw1268">std::<span class="me2">vector</span></span></a><span class="sy1"><</span><span class="kw4">bool</span><span class="sy1">></span> v3<span class="br0">(</span>v1.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"negating a binary_function:<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<a href="cpp-algorithm-transform.html"><span class="kw1588">std::<span class="me2">transform</span></span></a><span class="br0">(</span>v1.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, v1.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, v2.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, v3.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>,
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std<span class="sy4">::</span><span class="me2">not2</span><span class="br0">(</span>old_same<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <a href="cpp-io-manip-boolalpha.html"><span class="kw1763">std::<span class="me2">boolalpha</span></span></a><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> i <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> i <span class="sy1"><</span> v1.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> v1<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> v2<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> v3<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"negating a standard functor:<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<a href="cpp-algorithm-transform.html"><span class="kw1588">std::<span class="me2">transform</span></span></a><span class="br0">(</span>v1.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, v1.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, v2.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, v3.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>,
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std<span class="sy4">::</span><span class="me2">not2</span><span class="br0">(</span><a href="cpp-utility-functional-equal_to.html"><span class="kw1035">std::<span class="me2">equal_to</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> i <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> i <span class="sy1"><</span> v1.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> v1<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> v2<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> v3<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"negating a std::function:<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<a href="cpp-algorithm-transform.html"><span class="kw1588">std::<span class="me2">transform</span></span></a><span class="br0">(</span>v1.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, v1.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, v2.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, v3.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>,
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std<span class="sy4">::</span><span class="me2">not2</span><span class="br0">(</span><a href="cpp-utility-functional-function.html"><span class="kw1058">std::<span class="me2">function</span></span></a><span class="sy1"><</span><span class="kw4">bool</span><span class="br0">(</span><span class="kw4">int</span>,<span class="kw4">int</span><span class="br0">)</span><span class="sy1">></span><span class="br0">(</span>new_same<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> i <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> i <span class="sy1"><</span> v1.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> v1<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> v2<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> v3<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"negating a std::reference_wrapper:<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<a href="cpp-algorithm-transform.html"><span class="kw1588">std::<span class="me2">transform</span></span></a><span class="br0">(</span>v1.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, v1.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, v2.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, v3.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>,
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std<span class="sy4">::</span><span class="me2">not2</span><span class="br0">(</span><a href="cpp-utility-functional-ref.html"><span class="kw1068">std::<span class="me2">ref</span></span></a><span class="br0">(</span>same_fn<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> i <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> i <span class="sy1"><</span> v1.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> v1<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> v2<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> v3<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">negating a binary_function:
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0 2 true
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1 1 false
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2 0 true
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negating a standard functor:
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0 2 true
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1 1 false
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2 0 true
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negating a std::function:
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0 2 true
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1 1 false
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2 0 true
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negating a std::reference_wrapper:
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0 2 true
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1 1 false
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2 0 true</pre></div>
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</div>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-functional-not_fn.html"><span class="t-lines"><span>not_fn</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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</div>
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</td>
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<td>创建返回其保有的函数对象的结果之补的函数对象<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-functional-binary_negate.html"><span class="t-lines"><span>binary_negate</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx17">(C++17 中弃用)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span></span></div>
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</div>
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</td>
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<td>包装器函数对象，返回所持有的二元谓词的补<br />
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<span class="t-mark">(类模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-functional-function.html"><span class="t-lines"><span>function</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>包装具有指定函数调用签名的任意可复制构造类型的可调用对象<br />
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<span class="t-mark">(类模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-functional-not1.html"><span class="t-lines"><span>not1</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx17">(C++17 中弃用)</span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span></span></div>
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</div>
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</td>
|
|
<td>构造定制的 <span class="t-lc"><a href="cpp-utility-functional-unary_negate.html">std::unary_negate</a></span> 对象<br />
|
|
<span class="t-mark">(函数模板)</span></td>
|
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</tr>
|
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<tr class="t-dsc">
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<td>
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|
<div class="t-dsc-member-div">
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|
<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 中弃用)</span><span class="t-mark-rev t-until-cxx17">(C++17 中移除)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>从函数指针创建与适配器兼容的函数对象包装器<br />
|
|
<span class="t-mark">(函数模板)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-utility-functional-binary_function.html"><span class="t-lines"><span>binary_function</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx11">(C++11 中弃用)</span></span><span><span class="t-mark-rev t-until-cxx17">(C++17 中移除)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>与适配器兼容的二元函数基类<br />
|
|
<span class="t-mark">(类模板)</span></td>
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</tr>
|
|
</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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