klarkxy/hustoj
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
90010113ddacfb181cc4cfa007fb53634e2bc12c
hustoj/web/cppreference-zh/chmhelp/cpp-iterator-move_iterator-operator_2a.html
klarkxy 196e706fe4 上传cppreference
2025-08-01 12:57:54 +08:00

159 lines
12 KiB
HTML
Raw Blame History

<!DOCTYPE html>
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
<head><meta http-equiv="x-ua-compatible" content="ie=edge">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>std::move_iterator&lt;Iter&gt;::operator*,-&gt;</title>
<link rel="stylesheet" href="ext.css" />
<link rel="stylesheet" href="site_modules.css" />
</head>
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_iterator_move_iterator_operator skin-cppreference2 action-view cpp-navbar">
<div id="cpp-content-base">
<div id="content"><a id="top"></a>
<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::move_iterator&lt;Iter&gt;::</span>operator*,-&gt;</h1>
<div id="bodyContent">
<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-iterator.html">iterator</a>&lrm; | <a href="cpp-iterator-move_iterator.html">move iterator</a></span></div>
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
<table class="t-dcl-begin">
<tbody></tbody>
<tbody class="t-dcl-rev t-dcl-rev-num">
<tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(1)</td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11 t-until-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp">reference operator<span class="sy2">*</span> <span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> reference operator<span class="sy2">*</span> <span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
</tr>
</tbody>
<tbody></tbody>
<tbody class="t-dcl-rev t-dcl-rev-num">
<tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(2)</td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11 t-until-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp">pointer operator<span class="sy2">-</span><span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> pointer operator<span class="sy2">-</span><span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span><br />
<span class="t-mark">(C++20 &#20013;&#24323;&#29992;)</span></td>
</tr>
</tbody>
<tbody>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>&#36820;&#22238;&#21040;&#24403;&#21069;&#20803;&#32032;&#30340;&#21491;&#20540;&#24341;&#29992;&#25110;&#25351;&#38024;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#31561;&#20215;&#20110; <span class="t-rev-inl t-until-cxx20"><span><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">static_cast</span><span class="sy1">&lt;</span>reference<span class="sy1">&gt;</span><span class="br0">(</span><span class="sy2">*</span>base<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span></span> <span><span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></span></span><span class="t-rev-inl t-since-cxx20"><span><span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>base<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span></span> <span><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#31561;&#20215;&#20110; <a href="cpp-iterator-move_iterator-base.html"><code>base()</code></a> &#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<div class="t-li1"><span class="t-li">1)</span> &#21040;&#24403;&#21069;&#20803;&#32032;&#30340;&#21491;&#20540;&#24341;&#29992;&#25110;&#20854;&#21103;&#26412;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#24213;&#23618;&#36845;&#20195;&#22120;&#30340;&#21103;&#26412;&#12290;&#33509;&#30452;&#25509;&#20351;&#29992; <code>-&gt;</code> &#21017;&#26368;&#32456;&#36820;&#22238;&#25351;&#21521;&#24403;&#21069;&#20803;&#32032;&#30340;&#25351;&#38024;&#12290;</div>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#27880;&#24847;&#33509;&#30452;&#25509;&#20351;&#29992; <code>-&gt;</code> &#21017; <span class="t-v">(2)</span> &#26368;&#32456;&#36820;&#22238;&#25351;&#38024;&#12290;&#35299;&#24341;&#29992;&#25351;&#38024;&#26102;&#65292;&#36820;&#22238;&#20540;&#26159;&#24038;&#20540;&#12290;&#36825;&#21487;&#33021;&#23548;&#33268;&#38750;&#26377;&#24847;&#30340;&#34892;&#20026;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;iomanip&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;vector&gt;</span>
<span class="kw4">void</span> print<span class="br0">(</span><span class="kw4">auto</span> rem, <span class="kw4">auto</span> <span class="kw4">const</span><span class="sy3">&amp;</span> v<span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">for</span> <span class="br0">(</span><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> rem<span class="sy4">;</span> <span class="kw4">auto</span> <span class="kw4">const</span><span class="sy3">&amp;</span> e <span class="sy4">:</span> v<span class="br0">)</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> quoted<span class="br0">(</span>e<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a><span class="sy1">&lt;</span><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">&gt;</span> p<span class="br0">{</span><span class="st0">&quot;alpha&quot;</span>, <span class="st0">&quot;beta&quot;</span>, <span class="st0">&quot;gamma&quot;</span>, <span class="st0">&quot;delta&quot;</span><span class="br0">}</span>, q<span class="sy4">;</span>
print<span class="br0">(</span><span class="st0">&quot;1) p: &quot;</span>, p<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><a href="cpp-iterator-move_iterator.html"><span class="kw659">std::<span class="me2">move_iterator</span></span></a> it<span class="br0">{</span>p.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">}</span>, end<span class="br0">{</span>p.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span> it <span class="sy3">!</span><span class="sy1">=</span> end<span class="sy4">;</span> <span class="sy2">++</span>it<span class="br0">)</span> <span class="br0">{</span>
it<span class="sy2">-</span><span class="sy1">&gt;</span>push_back<span class="br0">(</span><span class="st0">&#39;!&#39;</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#35843;&#29992; -&gt; string::push_back(char)</span>
q.<span class="me1">emplace_back</span><span class="br0">(</span> <span class="sy2">*</span>it <span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
print<span class="br0">(</span><span class="st0">&quot;2) p: &quot;</span>, p<span class="br0">)</span><span class="sy4">;</span>
print<span class="br0">(</span><span class="st0">&quot;3) q: &quot;</span>, q<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a> v<span class="br0">{</span><span class="nu0">1</span>,<span class="nu0">2</span>,<span class="nu0">3</span><span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-iterator-move_iterator.html"><span class="kw659">std::<span class="me2">move_iterator</span></span></a> it<span class="br0">{</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
<span class="co1">// *it = 13; // &#38169;&#35823;&#65306;&#23558;&#21491;&#20540;&#29992;&#20316;&#24038;&#20540;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">1) p: &quot;alpha&quot; &quot;beta&quot; &quot;gamma&quot; &quot;delta&quot;
2) p: &quot;&quot; &quot;&quot; &quot;&quot; &quot;&quot;
3) q: &quot;alpha!&quot; &quot;beta!&quot; &quot;gamma!&quot; &quot;delta!&quot;</pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">&#32570;&#38519;&#25253;&#21578;</span></h3>
<p>&#19979;&#21015;&#26356;&#25913;&#34892;&#20026;&#30340;&#32570;&#38519;&#25253;&#21578;&#36861;&#28335;&#22320;&#24212;&#29992;&#20110;&#20197;&#21069;&#20986;&#29256;&#30340; C++ &#26631;&#20934;&#12290;</p>
<table class="dsctable" style="font-size:0.8em">
<tr>
<th>DR</th>
<th>&#24212;&#29992;&#20110;</th>
<th>&#20986;&#29256;&#26102;&#30340;&#34892;&#20026;</th>
<th>&#27491;&#30830;&#34892;&#20026;</th>
</tr>
<tr>
<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue2106">LWG 2106</a></td>
<td>C++11</td>
<td>&#33509;&#35299;&#24341;&#29992;&#24213;&#23618;&#36845;&#20195;&#22120;&#36820;&#22238;&#32431;&#21491;&#20540;&#21017;&#35299;&#24341;&#29992; <code>move_iterator</code> &#33021;&#36820;&#22238;&#24748;&#22402;&#24341;&#29992;</td>
<td>&#26367;&#32780;&#36820;&#22238;&#23545;&#35937;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-move_iterator-operator_at.html"><span class="t-lines"><span>operator[]</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
</td>
<td>&#25353;&#32034;&#24341;&#35775;&#38382;&#20803;&#32032;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
</table>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink