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<title>std::front_insert_iterator</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>front_insert_iterator</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-iterator.html">iterator</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-iterator.html"><iterator></a></code></div>
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<td></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> Container <span class="sy1">></span><br /></span>
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<p><span class="kw1">class</span> front_insert_iterator <span class="sy4">:</span> <span class="kw1">public</span> <a href="cpp-iterator-iterator.html"><span class="kw657">std::<span class="me2">iterator</span></span></a><span class="sy1"><</span> <a href="cpp-iterator-iterator_tags.html"><span class="kw653">std::<span class="me2">output_iterator_tag</span></span></a>,<br /></p>
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<span class="kw4">void</span>,<span class="kw4">void</span>,<span class="kw4">void</span>,<span class="kw4">void</span> <span class="sy1">></span></div>
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<td><span class="t-mark-rev t-until-cxx17">(C++17 前)</span></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> Container <span class="sy1">></span><br />
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<span class="kw1">class</span> front_insert_iterator<span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<p><code>std::front_insert_iterator</code> 是前附元素到为之构造迭代器的<a href="cpp-named_req-OutputIterator.html"><span style="font-style:italic">老式输出迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyOutputIterator)</span></a> 。凡在赋值给（无论是否解引用）迭代器时调用容器的 <code>push_front()</code> 成员函数。自增 <code>std::front_insert_iterator</code> 是无操作。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<td>成员类型</td>
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<td>定义</td>
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<td><code>iterator_category</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-iterator-iterator_tags.html"><span class="kw653">std::<span class="me2">output_iterator_tag</span></span></a></span></span></td>
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<td><code>value_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span></span></span></td>
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<td><code>difference_type</code></td>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span></span></span></p>
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<td><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-ptrdiff_t.html"><span class="kw101">std::<span class="me2">ptrdiff_t</span></span></a></span></span></p>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<td><code>pointer</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span></span></span></td>
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<td><code>reference</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span></span></span></td>
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<td><code>container_type</code></td>
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<td><code>Container</code></td>
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<p>要求通过从 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-iterator-iterator.html"><span class="kw657">std::<span class="me2">iterator</span></span></a><span class="sy1"><</span><a href="cpp-iterator-iterator_tags.html"><span class="kw653">std::<span class="me2">output_iterator_tag</span></span></a>, <span class="kw4">void</span>, <span class="kw4">void</span>, <span class="kw4">void</span>, <span class="kw4">void</span><span class="sy1">></span></span></span> 继承获得成员类型 <code>iterator_category</code>、 <code>value_type</code>、 <code>difference_type</code>、 <code>pointer</code> 及 <code>reference</code> 。</p>
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<td><span class="t-mark-rev t-until-cxx17">(C++17 前)</span></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<div><a href="cpp-iterator-front_insert_iterator-front_insert_iterator.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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<td>构造新的 <code>front_insert_iterator</code><br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-iterator-front_insert_iterator-operator=.html"><span class="t-lines"><span>operator=</span></span></a></div>
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<td>插入对象到关联的容器<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-iterator-front_insert_iterator-operator*.html"><span class="t-lines"><span>operator*</span></span></a></div>
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<td>无操作<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-iterator-front_insert_iterator-operator++.html"><span class="t-lines"><span>operator++</span><span>operator++<span class="t-dsc-small">(int)</span></span></span></a></div>
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<td>无操作<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.AF.B9.E8.B1.A1">成员对象</span></h3>
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<td>成员名</td>
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<td>定义</td>
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<td><code>container</code> <span class="t-mark">(受保护成员对象)</span></td>
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<td><code>Container*</code> 类型指针</td>
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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 class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <vector></span>
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<span class="co2">#include <deque></span>
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<span class="co2">#include <iostream></span>
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<span class="co2">#include <iterator></span>
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<span class="co2">#include <algorithm></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-vector.html"><span class="kw1268">std::<span class="me2">vector</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> v<span class="br0">{</span><span class="nu0">1</span>,<span class="nu0">2</span>,<span class="nu0">3</span>,<span class="nu0">4</span>,<span class="nu0">5</span><span class="br0">}</span><span class="sy4">;</span>
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<a href="cpp-container-deque.html"><span class="kw1270">std::<span class="me2">deque</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> d<span class="sy4">;</span>
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<a href="cpp-algorithm-copy.html"><span class="kw1581">std::<span class="me2">copy</span></span></a><span class="br0">(</span>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>,
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std<span class="sy4">::</span><span class="me2">front_insert_iterator</span><span class="sy1"><</span><a href="cpp-container-deque.html"><span class="kw1270">std::<span class="me2">deque</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">>></span><span class="br0">(</span>d<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 或 std::front_inserter(d)</span>
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<span class="kw1">for</span><span class="br0">(</span><span class="kw4">int</span> n <span class="sy4">:</span> d<span class="br0">)</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> n <span class="sy1"><<</span> <span class="st0">' '</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <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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<p>输出：</p>
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<div class="text source-text">
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<pre class="de1">5 4 3 2 1</pre></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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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-iterator-front_inserter.html"><span class="t-lines"><span>front_inserter</span></span></a></div>
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<td>创建拥有从实参推出的类型的 <span class="t-lc"><strong class="selflink">std::front_insert_iterator</strong></span><br />
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<span class="t-mark">(函数模板)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-iterator-back_insert_iterator.html"><span class="t-lines"><span>back_insert_iterator</span></span></a></div>
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</td>
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<td>用于在容器尾部插入的迭代器适配器<br />
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<span class="t-mark">(类模板)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-iterator-insert_iterator.html"><span class="t-lines"><span>insert_iterator</span></span></a></div>
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</div>
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</td>
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<td>用于插入容器的迭代器适配器<br />
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<span class="t-mark">(类模板)</span></td>
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<div class="visualClear"></div>
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