174 lines
14 KiB
HTML
174 lines
14 KiB
HTML
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_utility_functional_not1 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>not1</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 />
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<a href="cpp-utility-functional-unary_negate.html"><span class="kw1047">std::<span class="me2">unary_negate</span></span></a><span class="sy1"><</span>Predicate<span class="sy1">></span> not1<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-unary_negate.html"><span class="kw1047">std::<span class="me2">unary_negate</span></span></a><span class="sy1"><</span>Predicate<span class="sy1">></span> not1<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>not1</code> 是用于创建返回传递的一元谓词的补的函数对象。创建的函数对象类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-unary_negate.html"><span class="kw1047">std::<span class="me2">unary_negate</span></span></a><span class="sy1"><</span>Predicate<span class="sy1">></span></span></span> 。</p>
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<p>一元谓词类型必须定义成员类型 <code>argument_type</code> ，它可转换为谓词的参数类型。从 <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-negate.html">std::negate</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-mem_fn.html">std::mem_fn</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-function.html">std::function</a></span> 、 <span class="t-lc"><a href="cpp-utility-hash.html">std::hash</a></span> 或调用另一 <span class="t-lc"><strong class="selflink">std::not1</strong></span> 获得的 unary_function 对象定义此类型，如同从弃用的 <span class="t-lc"><a href="cpp-utility-functional-unary_function.html">std::unary_function</a></span> 导出的函数对象。</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>一元谓词</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><code>std::not1</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-unary_negate.html"><span class="kw1047">std::<span class="me2">unary_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="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <algorithm></span>
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<span class="co2">#include <numeric></span>
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<span class="co2">#include <iterator></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> LessThan7 <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"><</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> i<span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span> <span class="kw1">return</span> i <span class="sy1"><</span> <span class="nu0">7</span><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> v<span class="br0">(</span><span class="nu0">10</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-algorithm-iota.html"><span class="kw1654">std::<span class="me2">iota</span></span></a><span class="br0">(</span>begin<span class="br0">(</span>v<span class="br0">)</span>, end<span class="br0">(</span>v<span class="br0">)</span>, <span class="nu0">0</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-algorithm-count_if.html"><span class="kw1570">std::<span class="me2">count_if</span></span></a><span class="br0">(</span>begin<span class="br0">(</span>v<span class="br0">)</span>, end<span class="br0">(</span>v<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">not1</span><span class="br0">(</span>LessThan7<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><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="co1">// 同上，但使用 std::function</span>
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<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="br0">)</span><span class="sy1">></span> less_than_9 <span class="sy1">=</span> <span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">int</span> x<span class="br0">)</span><span class="br0">{</span> <span class="kw1">return</span> x <span class="sy1"><</span> <span class="nu0">9</span><span class="sy4">;</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-algorithm-count_if.html"><span class="kw1570">std::<span class="me2">count_if</span></span></a><span class="br0">(</span>begin<span class="br0">(</span>v<span class="br0">)</span>, end<span class="br0">(</span>v<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">not1</span><span class="br0">(</span>less_than_9<span class="br0">)</span><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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<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">3
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1</pre></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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<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-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 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 class="t-dsc">
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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"><a href="cpp-utility-functional-binary_negate.html">std::binary_negate</a></span> 对象<br />
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<span class="t-mark">(函数模板)</span></td>
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<tr class="t-dsc">
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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_function.html"><span class="t-lines"><span>unary_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>与适配器兼容的一元函数基类<br />
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<span class="t-mark">(类模板)</span></td>
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</div>
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<div class="visualClear"></div>
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