105 lines
5.8 KiB
HTML
105 lines
5.8 KiB
HTML
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<title>std::map<Key,T,Compare,Allocator>::lower_bound</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_container_map_lower_bound skin-cppreference2 action-view cpp-page-template cpp-navbar">
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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>lower_bound</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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<p></p>
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<div><span class="mw-geshi cpp source-cpp">iterator lower_bound<span class="br0">(</span> <span class="kw4">const</span> Key<span class="sy3">&</span> key <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<div><span class="mw-geshi cpp source-cpp">const_iterator lower_bound<span class="br0">(</span> <span class="kw4">const</span> Key<span class="sy3">&</span> key <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(1)</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> K <span class="sy1">></span><br />
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iterator lower_bound<span class="br0">(</span><span class="kw4">const</span> K<span class="sy3">&</span> x<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</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> K <span class="sy1">></span><br />
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const_iterator lower_bound<span class="br0">(</span><span class="kw4">const</span> K<span class="sy3">&</span> x<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</span></td>
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<div class="t-li1"><span class="t-li">1)</span> 返回指向首个<i>不小于</i> <code>key</code> 的元素的迭代器。</div>
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<div class="t-li1"><span class="t-li">2)</span> 返回指向首个比较<i>不小于</i>值 <code>x</code> 的元素的迭代器。此重载仅若有限定标识 <span class="t-c"><span class="mw-geshi cpp source-cpp">Compare<span class="sy4">::</span><span class="me2">is_transparent</span></span></span> 合法并指代类型才参与重载决议。它允许无需构造 <code>Key</code> 的实例就调用此函数。</div>
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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>key</td>
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<td>-</td>
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<td>要与元素比较的键值</td>
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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>能与 <code>Key</code> 比较的替用值</td>
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</tr>
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</table>
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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>指向首个<i>不小于</i> <code>key</code> 的元素的迭代器。若找不到这种元素，则返回尾后迭代器（见 <span class="t-lc"><a href="cpp-container-map-end.html">end()</a></span> ）。</p>
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<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">复杂度</span></h3>
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<p>与容器大小成对数。</p>
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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-container-map-equal_range.html"><span class="t-lines"><span>equal_range</span></span></a></div>
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</div>
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</td>
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<td>返回匹配特定键的元素范围<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-container-map-upper_bound.html"><span class="t-lines"><span>upper_bound</span></span></a></div>
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</div>
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</td>
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<td>返回指向首个<i>大于</i>给定键的元素的迭代器<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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