164 lines
7.7 KiB
HTML
164 lines
7.7 KiB
HTML
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<title>std::map<Key,T,Compare,Allocator>::value_compare</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::map<Key,T,Compare,Allocator>::</span>value_compare</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-container.html">container</a>‎ | <a href="cpp-container-map.html">map</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">class</span> value_compare<span class="sy4">;</span></span></div>
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<p><code>std::map::value_compare</code> 是函数对象，通过比较 pair 的首组分比较 <code>std::map::value_type</code> （关键-值 pair ）类型对象。</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>result_type</code> <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></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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<td><code>first_argument_type</code> <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></td>
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<td><code>value_type</code></td>
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<td><code>second_argument_type</code> <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></td>
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<td><code>value_type</code></td>
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<p>这些成员类型由公开继承 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-binary_function.html"><span class="kw1126">std::<span class="me2">binary_function</span></span></a><span class="sy1"><</span>value_type, value_type, <span class="kw4">bool</span><span class="sy1">></span></span></span> 获得。</p>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td>
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<h3><span class="mw-headline" id=".E5.8F.97.E4.BF.9D.E6.8A.A4.E6.88.90.E5.91.98.E5.AF.B9.E8.B1.A1">受保护成员对象</span></h3>
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<div><span class="t-lines"><span><span class="t-dsc-small">Compare</span> comp</span></span></div>
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<td>存储的比较器<br />
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<span class="t-mark">(受保护成员对象)</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><strong class="selflink"><span class="t-lines"><span>(构造函数)</span></span></strong></div>
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</td>
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<td>构造新的 <code>value_compare</code> 对象<br />
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<span class="t-mark">(受保护成员函数)</span></td>
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<div><strong class="selflink"><span class="t-lines"><span>operator()</span></span></strong></div>
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<td>比较两个 <code>value_type</code> 类型的值<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::map.3CKey.2CT.2CCompare.2CAlloc.3E::value_compare::value_compare"><span style="font-size:0.7em; line-height:130%">std::map<Key,T,Compare,Alloc>::value_compare::</span>value_compare</span></h2>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">protected</span><span class="sy4">:</span><br />
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value_compare<span class="br0">(</span> Compare c <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>初始化内部比较器的实例为 <code>c</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>c</td>
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<td>-</td>
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<td>要赋值的比较器</td>
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<h2><span class="mw-headline" id="std::map.3CKey.2CT.2CCompare.2CAlloc.3E::value_compare::operator.28.29"><span style="font-size:0.7em; line-height:130%">std::map<Key,T,Compare,Alloc>::value_compare::</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> <span class="kw4">const</span> value_type<span class="sy3">&</span> lhs, <span class="kw4">const</span> value_type<span class="sy3">&</span> rhs <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<p>通过调用存储的比较器比较 <code>lhs.first</code> 与 <code>rhs.first</code> 。</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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<td>lhs, rhs</td>
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<td>-</td>
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<td>要比较的值</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><span class="t-c"><span class="mw-geshi cpp source-cpp">comp<span class="br0">(</span>lhs.<span class="me1">first</span>, rhs.<span class="me1">first</span><span class="br0">)</span></span></span> 。</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>可能抛出实现定义的异常。</p>
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