303 lines
21 KiB
HTML
303 lines
21 KiB
HTML
<!DOCTYPE html>
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<title>std::binary_negate</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_utility_functional_binary_negate 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>binary_negate</h1>
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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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<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 /></span>
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<p><span class="kw1">struct</span> binary_negate <span class="sy4">:</span><br />
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<span class="kw1">public</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><br />
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Predicate<span class="sy4">::</span><span class="me2">first_argument_type</span>,<br />
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Predicate<span class="sy4">::</span><span class="me2">second_argument_type</span>,<br />
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<span class="kw4">bool</span><br /></p>
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<span class="sy1">></span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 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="kw1">struct</span> binary_negate<span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 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>binary_negate</code> 是返回其所保有的二元谓词的补的包装函数对象。</p>
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<p>二元谓词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"><a href="cpp-utility-functional-not2.html">std::not2</a></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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<p><code>binary_negate</code> 对象简单地以辅助函数 <span class="t-lc"><a href="cpp-utility-functional-not2.html">std::not2</a></span> 创建。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<td>类型</td>
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<td>定义</td>
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<td><code>first_argument_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">Predicate<span class="sy4">::</span><span class="me2">first_argument_type</span></span></span></td>
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<tr class="t-dsc">
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<td><code>second_argument_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">Predicate<span class="sy4">::</span><span class="me2">second_argument_type</span></span></span></td>
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<td><code>result_type</code></td>
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<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">成员函数</span></h3>
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<div><span class="t-lines"><span>(构造函数)</span></span></div>
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</div>
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</td>
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<td>以提供的谓词构造新的 binary_negate 对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><span class="t-lines"><span>operator()</span></span></div>
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<td>返回调用存储的谓词结果的逻辑补<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<h2><span class="mw-headline" id="std::binary_negate::binary_negate"><span style="font-size:0.7em; line-height:130%">std::binary_negate::</span>binary_negate</span></h2>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> binary_negate<span class="br0">(</span> Predicate <span class="kw4">const</span><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">explicit</span> <span class="kw4">constexpr</span> binary_negate<span class="br0">(</span> Predicate <span class="kw4">const</span><span class="sy3">&</span> pred <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</span></td>
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<p>构造的 <code>binary_negate</code> 函数对象，拥有存储的谓词 <code>pred</code> 。</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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<td>pred</td>
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<td>-</td>
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<td>谓词函数对象</td>
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<div class="t-member">
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<h2><span class="mw-headline" id="std::binary_negate::operator.28.29"><span style="font-size:0.7em; line-height:130%">std::binary_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> first_argument_type <span class="kw4">const</span><span class="sy3">&</span> x,<br />
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second_argument_type <span class="kw4">const</span><span class="sy3">&</span> y <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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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="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span> first_argument_type <span class="kw4">const</span><span class="sy3">&</span> x,<br />
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second_argument_type <span class="kw4">const</span><span class="sy3">&</span> y <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>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</span></td>
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<p>返回调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">pred<span class="br0">(</span>x, y<span class="br0">)</span></span></span> 结果的逻辑补。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0_2">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>x</td>
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<td>-</td>
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<td>通过谓词传递的第一参数</td>
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</tr>
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<tr class="t-par">
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<td>y</td>
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<td>-</td>
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<td>通过谓词传递的第二参数</td>
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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>调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">pred<span class="br0">(</span>x, y<span class="br0">)</span></span></span> 结果的逻辑补。</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> 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="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="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="sy4">;</span>
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<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"><</span> <span class="nu0">10</span><span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span> v1.<span class="me1">push_back</span><span class="br0">(</span>i<span class="br0">)</span><span class="sy4">;</span>
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<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"><</span> <span class="nu0">10</span><span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span> v2.<span class="me1">push_back</span><span class="br0">(</span><span class="nu0">10</span> <span class="sy2">-</span> i<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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std<span class="sy4">::</span><span class="me2">binary_negate</span><span class="sy1"><</span>same<span class="sy1">></span> not_same<span class="br0">(</span><span class="br0">(</span>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-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>, not_same<span class="br0">)</span><span class="sy4">;</span>
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<span class="coMULTI">/* C++11 解法：
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// 用 std::function<bool (int, int)>
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std::function<bool (int, int)> not_same =
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[](int x, int y)->bool{ return !same()(x, y); };
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std::transform(v1.begin(), v1.end(), v2.begin(), v3.begin(), not_same);
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*/</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a>.<span class="me1">setf</span><span class="br0">(</span><a href="cpp-io-ios_base-fmtflags.html"><span class="kw1689">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">boolalpha</span></span></a><span class="br0">)</span><span class="sy4">;</span>
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<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"><</span> <span class="nu0">10</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">0 10 true
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1 9 true
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2 8 true
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3 7 true
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4 6 true
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5 5 false
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6 4 true
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7 3 true
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8 2 true
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9 1 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-binary_function.html"><span class="t-lines"><span>binary_function</span></span></a></div>
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<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>
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</div>
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</td>
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<td>与适配器兼容的二元函数基类<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-not2.html"><span class="t-lines"><span>not2</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>
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<td>构造定制的 <span class="t-lc"><strong class="selflink">std::binary_negate</strong></span> 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-ptr_fun.html"><span class="t-lines"><span>ptr_fun</span></span></a></div>
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<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>
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</div>
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</td>
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<td>从函数指针创建与适配器兼容的函数对象包装器<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-unary_negate.html"><span class="t-lines"><span>unary_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，返回所持有的一元谓词的补<br />
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<span class="t-mark">(类模板)</span></td>
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</tr>
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</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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