125 lines
8.7 KiB
HTML
125 lines
8.7 KiB
HTML
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<title>std::forward_list<T,Allocator>::emplace_after</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_container_forward_list_emplace_after skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::forward_list<T,Allocator>::</span>emplace_after</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-container.html">container</a>‎ | <a href="cpp-container-forward_list.html">forward list</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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<table class="t-dcl-begin">
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<tbody>
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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"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span>... <span class="me1">Args</span> <span class="sy1">></span><br />
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iterator emplace_after<span class="br0">(</span> const_iterator pos, Args<span class="sy3">&&</span>... <span class="me1">args</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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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新元素。原位构造元素，即不进行复制或移动操作。准确地以与提供给函数者相同的参数调用元素的构造函数。</p>
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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>新元素将构造于其后的迭代器</td>
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</tr>
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<tr class="t-par">
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<td>args</td>
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<td>-</td>
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<td>转发给元素构造函数的参数</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>指向新元素的迭代器。</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>常数。</p>
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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>若抛出任何异常（例如由构造函数），则容器留在未修改状态，如同从未调用过此函数（强异常保证）。</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="t-example">
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<p>示例演示按自然顺序（与逆序相反）的单链表规范填充。</p>
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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 <iostream></span>
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<span class="co2">#include <string></span>
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<span class="kw1">struct</span> Sum <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> remark<span class="sy4">;</span>
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<span class="kw4">int</span> sum<span class="sy4">;</span>
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Sum<span class="br0">(</span><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> remark, <span class="kw4">int</span> sum<span class="br0">)</span>
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<span class="sy4">:</span> remark<span class="br0">{</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>remark<span class="br0">)</span><span class="br0">}</span>, sum<span class="br0">{</span>sum<span class="br0">}</span> <span class="br0">{</span><span class="br0">}</span>
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<span class="kw4">void</span> print<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</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> remark <span class="sy1"><<</span> <span class="st0">" = "</span> <span class="sy1"><<</span> sum <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>
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<span class="br0">}</span><span class="sy4">;</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>Sum<span class="sy1">></span> list<span class="sy4">;</span>
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<span class="kw4">auto</span> iter <span class="sy1">=</span> list.<span class="me1">before_begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> str<span class="br0">{</span><span class="st0">"1"</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">int</span> i<span class="br0">{</span><span class="nu0">1</span><span class="br0">}</span>, sum<span class="br0">{</span><span class="nu0">1</span><span class="br0">}</span><span class="sy4">;</span> i <span class="sy3">!</span><span class="sy1">=</span> <span class="nu0">10</span><span class="sy4">;</span> sum <span class="sy2">+</span><span class="sy1">=</span> i<span class="br0">)</span> <span class="br0">{</span>
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iter <span class="sy1">=</span> list.<span class="me1">emplace_after</span><span class="br0">(</span>iter, str, sum<span class="br0">)</span><span class="sy4">;</span>
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<span class="sy2">++</span>i<span class="sy4">;</span>
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str <span class="sy2">+</span><span class="sy1">=</span> <span class="st0">" + "</span> <span class="sy2">+</span> <a href="cpp-string-basic_string-to_string.html"><span class="kw1265">std::<span class="me2">to_string</span></span></a><span class="br0">(</span>i<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">const</span> Sum<span class="sy3">&</span> s <span class="sy4">:</span> list<span class="br0">)</span> s.<span class="me1">print</span><span class="br0">(</span><span class="br0">)</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">1 = 1
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1 + 2 = 3
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1 + 2 + 3 = 6
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1 + 2 + 3 + 4 = 10
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1 + 2 + 3 + 4 + 5 = 15
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1 + 2 + 3 + 4 + 5 + 6 = 21
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1 + 2 + 3 + 4 + 5 + 6 + 7 = 28
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1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 = 36
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1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45</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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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-container-forward_list-insert_after.html"><span class="t-lines"><span>insert_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>在某个元素后插入新元素<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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</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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</body>
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