202 lines
18 KiB
HTML
202 lines
18 KiB
HTML
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<title>std::forward_list<T,Allocator>::insert_after</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::forward_list<T,Allocator>::</span>insert_after</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-forward_list.html">forward list</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">iterator insert_after<span class="br0">(</span> const_iterator pos, <span class="kw4">const</span> T<span class="sy3">&</span> value <span class="br0">)</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-cxx11">(C++11 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx11">
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<td>
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<div><span class="mw-geshi cpp source-cpp">iterator insert_after<span class="br0">(</span> const_iterator pos, T<span class="sy3">&&</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx11">
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<td>
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<div><span class="mw-geshi cpp source-cpp">iterator insert_after<span class="br0">(</span> const_iterator pos, size_type count, <span class="kw4">const</span> T<span class="sy3">&</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx11">
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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> InputIt <span class="sy1">></span><br />
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iterator insert_after<span class="br0">(</span> const_iterator pos, InputIt first, InputIt last <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(4)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp">iterator insert_after<span class="br0">(</span> const_iterator pos, <a href="cpp-utility-initializer_list.html"><span class="kw960">std::<span class="me2">initializer_list</span></span></a><span class="sy1"><</span>T<span class="sy1">></span> ilist <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(5)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<p>在容器中的指定位置后插入元素。</p>
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<div class="t-li1"><span class="t-li">1-2)</span> 在 <code>pos</code> 所指向的元素后插入 <code>value</code></div>
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<div class="t-li1"><span class="t-li">3)</span> 在 <code>pos</code> 所指向的元素后插入 <code>value</code> 的 <code>count</code> 个副本</div>
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<div class="t-li1"><span class="t-li">4)</span> 在 <code>pos</code> 所指向的元素后插入来自范围 <code>[first, last)</code> 的元素。 若 <code>first</code> 与 <code>last</code> 是指向 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 中的迭代器则行为未定义。</div>
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<div class="t-li1"><span class="t-li">5)</span> 插入来自 initializer_list <code>ilist</code> 的元素。</div>
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<p>没有引用和迭代器被非法化。</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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<table class="t-par-begin">
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<tr class="t-par">
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<td>pos</td>
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<td>-</td>
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<td>内容将插入到其后的迭代器</td>
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</tr>
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<tr class="t-par">
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<td>value</td>
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<td>-</td>
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<td>要插入的元素值</td>
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</tr>
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<tr class="t-par">
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<td>count</td>
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<td>-</td>
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<td>要插入的副本数</td>
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</tr>
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<tr class="t-par">
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<td>first, last</td>
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<td>-</td>
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<td>要插入的元素范围</td>
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</tr>
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<tr class="t-par">
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<td>ilist</td>
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<td>-</td>
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<td>插入值来源的 initializer_list</td>
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</tr>
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<tr class="t-par-hitem">
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<td colspan="3">类型要求</td>
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</tr>
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<tr class="t-par-req">
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<td colspan="3">-
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<div class="spacer"></div>
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<code>InputIt</code> 必须满足<a href="cpp-named_req-InputIterator.html"><span style="font-style:italic">老式输入迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyInputIterator)</span></a> 的要求。</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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<div class="t-li1"><span class="t-li">1-2)</span> 指向被插入元素的迭代器。、</div>
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<div class="t-li1"><span class="t-li">3)</span> 指向最后被插入元素的迭代器，或若 <span class="t-c"><span class="mw-geshi cpp source-cpp">count<span class="sy1">==</span><span class="nu0">0</span></span></span> 则为 <code>pos</code> 。</div>
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<div class="t-li1"><span class="t-li">4)</span> 指向最后被插入元素的迭代器，或若 <span class="t-c"><span class="mw-geshi cpp source-cpp">first<span class="sy1">==</span>last</span></span> 则为 <code>pos</code> 。</div>
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<div class="t-li1"><span class="t-li">5)</span> 指向最后被插入元素的迭代器，或若 <code>ilist</code> 为空则为 <code>pos</code> 。</div>
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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>若在 <code>insert_after</code> 期间抛出异常，则无效果（强异常保证）。</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">1-2)</span> 常数。</div>
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<div class="t-li1"><span class="t-li">3)</span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">count</span></span> 成线性</div>
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<div class="t-li1"><span class="t-li">4)</span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-iterator-distance.html"><span class="kw673">std::<span class="me2">distance</span></span></a><span class="br0">(</span>first, last<span class="br0">)</span></span></span> 成线性</div>
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<div class="t-li1"><span class="t-li">5)</span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">ilist.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span> 成线性</div>
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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="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <forward_list> </span>
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<span class="co2">#include <string> </span>
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<span class="co2">#include <iostream> </span>
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<span class="co2">#include <vector> </span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">typename</span> T<span class="sy1">></span>
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<a href="cpp-io-basic_ostream.html"><span class="kw1729">std::<span class="me2">ostream</span></span></a><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span><a href="cpp-io-basic_ostream.html"><span class="kw1729">std::<span class="me2">ostream</span></span></a><span class="sy3">&</span> s, <span class="kw4">const</span> <a href="cpp-container-forward_list.html"><span class="kw1273">std::<span class="me2">forward_list</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&</span> v<span class="br0">)</span> <span class="br0">{</span>
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s.<span class="me1">put</span><span class="br0">(</span><span class="st0">'['</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">char</span> comma<span class="br0">[</span><span class="nu0">3</span><span class="br0">]</span> <span class="sy1">=</span> <span class="br0">{</span><span class="st0">'<span class="es5">\0</span>'</span>, <span class="st0">' '</span>, <span class="st0">'<span class="es5">\0</span>'</span><span class="br0">}</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&</span> e <span class="sy4">:</span> v<span class="br0">)</span> <span class="br0">{</span>
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s <span class="sy1"><<</span> comma <span class="sy1"><<</span> e<span class="sy4">;</span>
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comma<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span> <span class="sy1">=</span> <span class="st0">','</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw1">return</span> s <span class="sy1"><<</span> <span class="st0">']'</span><span class="sy4">;</span>
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<span class="br0">}</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-container-forward_list.html"><span class="kw1273">std::<span class="me2">forward_list</span></span></a><span class="sy1"><</span><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">></span> words <span class="br0">{</span><span class="st0">"the"</span>, <span class="st0">"frogurt"</span>, <span class="st0">"is"</span>, <span class="st0">"also"</span>, <span class="st0">"cursed"</span><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">"words: "</span> <span class="sy1"><<</span> words <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="co1">// insert_after (2) </span>
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<span class="kw4">auto</span> beginIt <span class="sy1">=</span> words.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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words.<span class="me1">insert_after</span><span class="br0">(</span>beginIt, <span class="st0">"strawberry"</span><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">"words: "</span> <span class="sy1"><<</span> words <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="co1">// insert_after (3) </span>
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<span class="kw4">auto</span> anotherIt <span class="sy1">=</span> beginIt<span class="sy4">;</span>
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<span class="sy2">++</span>anotherIt<span class="sy4">;</span>
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anotherIt <span class="sy1">=</span> words.<span class="me1">insert_after</span><span class="br0">(</span>anotherIt, <span class="nu0">2</span>, <span class="st0">"strawberry"</span><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">"words: "</span> <span class="sy1"><<</span> words <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="co1">// insert_after (4)</span>
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<a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a><span class="sy1"><</span><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">></span> V <span class="sy1">=</span> <span class="br0">{</span> <span class="st0">"apple"</span>, <span class="st0">"banana"</span>, <span class="st0">"cherry"</span><span class="br0">}</span><span class="sy4">;</span>
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anotherIt <span class="sy1">=</span> words.<span class="me1">insert_after</span><span class="br0">(</span>anotherIt, V.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, V.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><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">"words: "</span> <span class="sy1"><<</span> words <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="co1">// insert_after (5) </span>
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words.<span class="me1">insert_after</span><span class="br0">(</span>anotherIt, <span class="br0">{</span><span class="st0">"jackfruit"</span>, <span class="st0">"kiwifruit"</span>, <span class="st0">"lime"</span>, <span class="st0">"mango"</span><span class="br0">}</span><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">"words: "</span> <span class="sy1"><<</span> words <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">words: [the, frogurt, is, also, cursed]
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words: [the, strawberry, frogurt, is, also, cursed]
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words: [the, strawberry, strawberry, strawberry, frogurt, is, also, cursed]
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words: [the, strawberry, strawberry, strawberry, apple, banana, cherry, frogurt, is, also, cursed]
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words: [the, strawberry, strawberry, strawberry, apple, banana, cherry, jackfruit, kiwifruit, lime, mango, frogurt, is, also, cursed]</pre></div>
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</div>
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</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-container-forward_list-emplace_after.html"><span class="t-lines"><span>emplace_after</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>在元素后原位构造元素<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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<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-container-forward_list-push_front.html"><span class="t-lines"><span>push_front</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>插入元素到容器起始<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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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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