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<title>std::basic_string_view<CharT,Traits>::compare</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_string_view<CharT,Traits>::</span>compare</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-string.html">string</a>‎ | <a href="cpp-string-basic_string_view.html">basic string view</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">int</span> compare<span class="br0">(</span>basic_string_view v<span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">int</span> compare<span class="br0">(</span>size_type pos1, size_type count1,<br />
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basic_string_view v<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-cxx17">(C++17 起)</span></td>
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<tr class="t-dcl t-since-cxx17">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">int</span> compare<span class="br0">(</span>size_type pos1, size_type count1, basic_string_view v,<br />
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size_type pos2, size_type count2<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">int</span> compare<span class="br0">(</span><span class="kw4">const</span> CharT<span class="sy2">*</span> s<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<tr class="t-dcl t-since-cxx17">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">int</span> compare<span class="br0">(</span>size_type pos1, size_type count1,<br />
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<span class="kw4">const</span> CharT<span class="sy2">*</span> s<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(5)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<tr class="t-dcl t-since-cxx17">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">int</span> compare<span class="br0">(</span>size_type pos1, size_type count1,<br />
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<span class="kw4">const</span> CharT<span class="sy2">*</span> s, size_type count2<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(6)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<td></td>
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<td></td>
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<td></td>
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<p>比较二个字符序列。</p>
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<div class="t-li1"><span class="t-li">1)</span> 要比较的序列长度 <code>rlen</code> 是 <span class="t-c"><span class="mw-geshi cpp source-cpp">size<span class="br0">(</span><span class="br0">)</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">v.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span> 的较小者。该函数通过调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">traits<span class="sy4">::</span><span class="me2">compare</span><span class="br0">(</span>data<span class="br0">(</span><span class="br0">)</span>, v.<span class="me1">data</span><span class="br0">(</span><span class="br0">)</span>, rlen<span class="br0">)</span></span></span> 比较二个视图，并根据下表返回一个值：</div>
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<table class="wikitable" style="text-align:center;">
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<tr>
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<th colspan="2">条件</th>
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<th>结果</th>
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<th>返回值</th>
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</tr>
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<td colspan="2" style="text-align:left;"><code>Traits::compare(data(), v.data(), <span class="t-spar">rlen</span>) < 0</code></td>
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<td><code>*this</code> <i>小于</i> <code>v</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy1"><</span><span class="nu0">0</span></span></span></td>
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<td rowspan="3"><code>Traits::compare(data(), v.data(), <span class="t-spar">rlen</span>) == 0</code></td>
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<td><code>size() < v.size()</code></td>
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<td><code>*this</code><i>小于</i> <code>v</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy1"><</span><span class="nu0">0</span></span></span></td>
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<td><code>size() == v.size()</code></td>
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<td><code>*this</code> <i>等于</i> <code>v</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span></td>
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<td><code>size() > v.size()</code></td>
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<td><code>*this</code> <i>大于</i> <code>v</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy1">></span><span class="nu0">0</span></span></span></td>
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<td colspan="2" style="text-align:left;"><code>Traits::compare(data(), v.data(), <span class="t-spar">rlen</span>) > 0</code></td>
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<td><code>*this</code> <i>大于</i> <code>v</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy1">></span><span class="nu0">0</span></span></span></td>
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<div class="t-li1"><span class="t-li">2)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">substr<span class="br0">(</span>pos1, count1<span class="br0">)</span>.<span class="me1">compare</span><span class="br0">(</span>v<span class="br0">)</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">3)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">substr<span class="br0">(</span>pos1, count1<span class="br0">)</span>.<span class="me1">compare</span><span class="br0">(</span>v.<span class="me1">substr</span><span class="br0">(</span>pos2, count2<span class="br0">)</span><span class="br0">)</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">4)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">compare<span class="br0">(</span>basic_string_view<span class="br0">(</span>s<span class="br0">)</span><span class="br0">)</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">5)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">substr<span class="br0">(</span>pos1, count1<span class="br0">)</span>.<span class="me1">compare</span><span class="br0">(</span>basic_string_view<span class="br0">(</span>s<span class="br0">)</span><span class="br0">)</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">6)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">substr<span class="br0">(</span>pos1, count1<span class="br0">)</span>.<span class="me1">compare</span><span class="br0">(</span>basic_string_view<span class="br0">(</span>s, count2<span class="br0">)</span><span class="br0">)</span></span></span> 。</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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<table class="t-par-begin">
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<tr class="t-par">
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<td>v</td>
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<td>-</td>
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<td>要比较的视图</td>
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</tr>
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<tr class="t-par">
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<td>s</td>
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<td>-</td>
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<td>指向要比较的字符串的指针</td>
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</tr>
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<tr class="t-par">
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<td>count1</td>
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<td>-</td>
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<td>此视图的要比较的字符数</td>
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</tr>
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<tr class="t-par">
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<td>pos1</td>
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<td>-</td>
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<td>此视图中要比较的首字符位置</td>
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</tr>
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<tr class="t-par">
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<td>count2</td>
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<td>-</td>
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<td>给定视图的要比较的字符数</td>
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</tr>
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<tr class="t-par">
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<td>pos2</td>
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<td>-</td>
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<td>给定视图的要比较的首字符位置</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>若此视图小于另一字符序列则为负值，若二个字符序列相等则为零，若此视图大于另一字符序列则为正值。</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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<div class="t-li1"><span class="t-li">1)</span> 与比较的字符数成线性。</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-string-basic_string_view-operator_cmp.html"><span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator<</span><span>operator></span><span>operator<=</span><span>operator>=</span><span>operator<=></span></span></a></div>
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<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>以字典序比较两个字符串视图<br />
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<span class="t-mark">(函数模板)</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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