74 lines
5.5 KiB
HTML
74 lines
5.5 KiB
HTML
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<title>std::match_results<BidirIt,Alloc>::ready</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::match_results<BidirIt,Alloc>::</span>ready</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-regex.html">regex</a>‎ | <a href="cpp-regex-match_results.html">match results</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> ready<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<p>指示 match_results 是否就绪（合法）。</p>
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<p>默认构造的 match_results 无结果状态（未<i>就绪</i>），而且只能由正则表达式算法之一变为就绪。<i>就绪</i>状态隐含已经完整建立了所有匹配结果。</p>
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<p>在未<i>就绪</i>的 match_results 对象上调用大多数成员函数的结果未定义。</p>
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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 match_results 就绪则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，否则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 。</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 <iostream></span>
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<span class="co2">#include <regex></span>
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<span class="co2">#include <string></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-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> target<span class="br0">(</span><span class="st0">"pattern"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-regex-match_results.html"><span class="kw2010">std::<span class="me2">smatch</span></span></a> sm<span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"default constructed smatch is "</span>
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<span class="sy1"><<</span> <span class="br0">(</span>sm.<span class="me1">ready</span><span class="br0">(</span><span class="br0">)</span> <span class="sy4">?</span> <span class="st0">" ready<span class="es1">\n</span>"</span> <span class="sy4">:</span> <span class="st0">" not ready<span class="es1">\n</span>"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-regex-basic_regex.html"><span class="kw2000">std::<span class="me2">regex</span></span></a> re1<span class="br0">(</span><span class="st0">"tte"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-regex-regex_search.html"><span class="kw2013">std::<span class="me2">regex_search</span></span></a><span class="br0">(</span>target, sm, re1<span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"after search, smatch is "</span>
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<span class="sy1"><<</span> <span class="br0">(</span>sm.<span class="me1">ready</span><span class="br0">(</span><span class="br0">)</span> <span class="sy4">?</span> <span class="st0">" ready<span class="es1">\n</span>"</span> <span class="sy4">:</span> <span class="st0">" not ready<span class="es1">\n</span>"</span><span class="br0">)</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 class="text source-text">
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<pre class="de1">default constructed smatch is not ready
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after search, smatch is ready</pre></div>
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