133 lines
8.3 KiB
HTML
133 lines
8.3 KiB
HTML
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<title>std::front_insert_iterator<Container>::operator=</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_iterator_front_insert_iterator_operator skin-cppreference2 action-view cpp-page-template cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::front_insert_iterator<Container>::</span>operator=</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-iterator.html">iterator</a>‎ | <a href="cpp-iterator-front_insert_iterator.html">front insert iterator</a></span></div>
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<div class="t-page-template" style="">
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<p></p>
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<table class="t-dcl-begin">
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<td rowspan="142">(1)</td>
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<td>
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<div><span class="mw-geshi cpp source-cpp">front_insert_iterator<span class="sy1"><</span>Container<span class="sy1">></span><span class="sy3">&</span><br />
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operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw1">typename</span> Container<span class="sy4">::</span><span class="me2">const_reference</span> value <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-until-cxx11">(C++11 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp">front_insert_iterator<span class="sy1"><</span>Container<span class="sy1">></span><span class="sy3">&</span><br />
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operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> <span class="kw1">typename</span> Container<span class="sy4">::</span><span class="me2">value_type</span><span class="sy3">&</span> value <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><br />
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<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> front_insert_iterator<span class="sy1"><</span>Container<span class="sy1">></span><span class="sy3">&</span><br />
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operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> <span class="kw1">typename</span> Container<span class="sy4">::</span><span class="me2">value_type</span><span class="sy3">&</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<td rowspan="142">(2)</td>
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<tr class="t-dcl t-since-cxx11 t-until-cxx20">
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<div><span class="mw-geshi cpp source-cpp">front_insert_iterator<span class="sy1"><</span>Container<span class="sy1">></span><span class="sy3">&</span><br />
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operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw1">typename</span> Container<span class="sy4">::</span><span class="me2">value_type</span><span class="sy3">&&</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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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><br />
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<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> front_insert_iterator<span class="sy1"><</span>Container<span class="sy1">></span><span class="sy3">&</span><br />
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operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw1">typename</span> Container<span class="sy4">::</span><span class="me2">value_type</span><span class="sy3">&&</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>插入给定的 <code>value</code> 到迭代器。</p>
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<div class="t-li1"><span class="t-li">1)</span> 导致 <span class="t-c"><span class="mw-geshi cpp source-cpp">container<span class="sy2">-</span><span class="sy1">></span>push_front<span class="br0">(</span>value<span class="br0">)</span></span></span></div>
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<div class="t-li1"><span class="t-li">2)</span> 导致 <span class="t-c"><span class="mw-geshi cpp source-cpp">container<span class="sy2">-</span><span class="sy1">></span>push_front<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>value<span class="br0">)</span><span class="br0">)</span></span></span></div>
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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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<td>value</td>
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<td>-</td>
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<td>要插入的值</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><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span></p>
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<p><br /></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 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 <iostream></span>
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<span class="co2">#include <iterator></span>
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<span class="co2">#include <deque></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-deque.html"><span class="kw1271">std::<span class="me2">deque</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> q<span class="sy4">;</span>
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<a href="cpp-iterator-front_insert_iterator.html"><span class="kw661">std::<span class="me2">front_insert_iterator</span></span></a><span class="sy1"><</span> <a href="cpp-container-deque.html"><span class="kw1271">std::<span class="me2">deque</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> <span class="sy1">></span> it<span class="br0">(</span>q<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="sy1">=</span><span class="nu0">0</span><span class="sy4">;</span> i<span class="sy1"><</span><span class="nu0">10</span><span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span>
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it <span class="sy1">=</span> i<span class="sy4">;</span> <span class="co1">// 调用 q.push_front(i)</span>
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<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">auto</span><span class="sy3">&</span> elem <span class="sy4">:</span> q<span class="br0">)</span> <a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> elem <span class="sy1"><<</span> <span class="st0">' '</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 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">9 8 7 6 5 4 3 2 1 0</pre></div>
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