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<title>std::regex_iterator<BidirIt,CharT,Traits>::operator++, operator++(int)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::regex_iterator<BidirIt,CharT,Traits>::</span>operator++, operator++<span style="font-size:0.7em; line-height:130%">(int)</span></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-regex_iterator.html">regex iterator</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">regex_iterator<span class="sy3">&</span> operator<span class="sy2">++</span><span class="br0">(</span><span class="br0">)</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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<div><span class="mw-geshi cpp source-cpp">regex_iterator operator<span class="sy2">++</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</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>推进迭代器到下个匹配。</p>
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<td class="mbox-text" style="">本节未完成<br />
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原因：更好地解释</td>
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<p>首先以 <span class="t-c"><span class="mw-geshi cpp source-cpp">match<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span>.<span class="me1">second</span></span></span> 的值构造 <code>BidirIt</code> 类型局部变量。</p>
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<p>若迭代器保有零长匹配且 <span class="t-c"><span class="mw-geshi cpp source-cpp">start <span class="sy1">==</span> end</span></span> ，则设置 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 为序列尾迭代器，函数返回。</p>
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<p>否则，若迭代器保有零长匹配，则运算符调用以下内容：</p>
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<p><span class="t-cc"><span class="mw-geshi cpp source-cpp">regex_search<span class="br0">(</span>start, end, match, <span class="sy2">*</span>pregex,<br />
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flags <span class="sy3">|</span> regex_constants<span class="sy4">::</span><span class="me2">match_not_null</span> <span class="sy3">|</span><br />
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regex_constants<span class="sy4">::</span><span class="me2">match_continuous</span><span class="br0">)</span><span class="sy4">;</span></span></span></p>
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<p>若调用返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，则函数返回。</p>
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<p>否则运算符自增 <code>start</code> 并持续，如同最近匹配不是零长匹配。</p>
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<p>若最近匹配不是零长匹配，则运算符设置 <code>flags</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp">flags <span class="sy3">|</span> regex_constants<span class="sy4">::</span><span class="me2">match_prev_avail</span></span></span> 并调用以下内容：</p>
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<p><span class="t-cc"><span class="mw-geshi cpp source-cpp">regex_search<span class="br0">(</span>start, end, match, <span class="sy2">*</span>pregex, flags<span class="br0">)</span><span class="sy4">;</span></span></span></p>
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<p>若调用返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> ，则运算符设置 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 为序列尾迭代器，函数返回。</p>
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<p>调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">regex_search</span></span> 返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 的所有情况下， <span class="t-c"><span class="mw-geshi cpp source-cpp">match.<span class="me1">prefix</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">first</span></span></span> 将等于 <span class="t-c"><span class="mw-geshi cpp source-cpp">match<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span>.<span class="me1">second</span></span></span> 的先前值，而且对于范围 <i>[0,</i> <span class="t-cc"><span class="mw-geshi cpp source-cpp">match.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span><i>)</i> 中满足 <span class="t-c"><span class="mw-geshi cpp source-cpp">match<span class="br0">[</span>i<span class="br0">]</span>.<span class="me1">matched</span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 的的每个 <i>i</i> ， <span class="t-c"><span class="mw-geshi cpp source-cpp">match<span class="br0">[</span>i<span class="br0">]</span>.<span class="me1">position</span><span class="br0">(</span><span class="br0">)</span></span></span> 将返回 <span class="t-c"><span class="mw-geshi cpp source-cpp">distance<span class="br0">(</span>begin, match<span class="br0">[</span>i<span class="br0">]</span>.<span class="me1">first</span><span class="br0">)</span></span></span> 。</p>
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<p>这表明 <span class="t-c"><span class="mw-geshi cpp source-cpp">match<span class="br0">[</span>i<span class="br0">]</span>.<span class="me1">position</span><span class="br0">(</span><span class="br0">)</span></span></span> 给出自目标序列起始的偏移，它通常与从传递给 <span class="t-c"><span class="mw-geshi cpp source-cpp">regex_search</span></span> 调用中的序列偏移不同。</p>
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<p>实现如何进行这些调整是未指定的。这表明编译器可以调用实现限定的搜索函数，该情况下将不调用用户定义的 <span class="t-c"><span class="mw-geshi cpp source-cpp">regex_search</span></span> 特化。</p>
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<p>若迭代器是序列尾迭代器则行为未定义。</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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<p>（无）</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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<div class="t-li1"><span class="t-li">1)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span></div>
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<div class="t-li1"><span class="t-li">2)</span> 迭代器的先前值。</div>
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