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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ranges::</span>uninitialized_move_n, <span style="font-size:0.7em; line-height:130%">std::ranges::</span>uninitialized_move_n_result</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-memory.html">memory</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-memory.html">&lt;memory&gt;</a></code></div>
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<div>&#35843;&#29992;&#31614;&#21517;</div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">input_iterator</span> I, no<span class="sy2">-</span>throw<span class="sy2">-</span>forward<span class="sy2">-</span>iterator O,<br /></span>
<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;no<span class="sy2">-</span>throw<span class="sy2">-</span>sentinel<span class="sy2">-</span><span class="kw1">for</span><span class="sy1">&lt;</span>O<span class="sy1">&gt;</span> S<span class="sy1">&gt;</span><br />
requires std<span class="sy4">::</span><span class="me2">constructible_from</span><span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">iter_value_t</span><span class="sy1">&lt;</span>O<span class="sy1">&gt;</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;std<span class="sy4">::</span><span class="me2">iter_rvalue_reference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;&gt;</span><br />
uninitialized_move_n_result<span class="sy1">&lt;</span>I, O<span class="sy1">&gt;</span><br /></p>
uninitialized_move_n<span class="br0">(</span> I ifirst, std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> n, O ofirst, S olast <span class="br0">)</span><span class="sy4">;</span></div>
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<td>(1)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div>&#36741;&#21161;&#31867;&#22411;</div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> I, <span class="kw1">class</span> O<span class="sy1">&gt;</span><br />
<span class="kw1">using</span> uninitialized_move_n_result <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">in_out_result</span><span class="sy1">&lt;</span>I, O<span class="sy1">&gt;</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<p>&#20174;&#22987;&#20110; <code>ifirst</code> &#30340;&#36755;&#20837;&#33539;&#22260;&#31227;&#21160; <span class="t-c"><span class="mw-geshi cpp source-cpp">N</span></span> &#20010;&#20803;&#32032;&#21040;&#33539;&#22260; <code>[ofirst, olast)</code> &#25152;&#25351;&#20195;&#30340;&#26410;&#21021;&#22987;&#21270;&#23384;&#20648;&#65292;&#20854;&#20013; <span class="t-c"><span class="mw-geshi cpp source-cpp">N</span></span> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">min<span class="br0">(</span>n, ranges<span class="sy4">::</span><span class="me2">distance</span><span class="br0">(</span>ofirst, olast<span class="br0">)</span><span class="br0">)</span></span></span> &#12290;</p>
<p>&#25928;&#26524;&#31561;&#20215;&#20110;&#65306;</p>
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<pre class="de1"><span class="kw1">for</span> <span class="br0">(</span><span class="sy4">;</span> n<span class="sy2">--</span> <span class="sy1">&gt;</span> <span class="nu0">0</span> <span class="sy3">&amp;&amp;</span> ofirst <span class="sy3">!</span><span class="sy1">=</span> olast<span class="sy4">;</span> <span class="sy2">++</span>ifirst, <span class="sy2">++</span>ofirst<span class="br0">)</span>
<span class="sy4">::</span><span class="me2">new</span> <span class="br0">(</span><span class="kw1">const_cast</span><span class="sy1">&lt;</span><span class="kw4">void</span><span class="sy2">*</span><span class="sy1">&gt;</span><span class="br0">(</span><span class="kw1">static_cast</span><span class="sy1">&lt;</span><span class="kw4">const</span> <span class="kw4">volatile</span> <span class="kw4">void</span><span class="sy2">*</span><span class="sy1">&gt;</span><span class="br0">(</span><a href="cpp-memory-addressof.html"><span class="kw757">std::<span class="me2">addressof</span></span></a><span class="br0">(</span><span class="sy2">*</span>first<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span>
<a href="cpp-types-remove_reference.html"><span class="kw607">std::<span class="me2">remove_reference_t</span></span></a><span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">iter_reference_t</span><span class="sy1">&lt;</span>O<span class="sy1">&gt;&gt;</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>ifirst<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></pre></div>
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<p>&#33509;&#22312;&#21021;&#22987;&#21270;&#26399;&#38388;&#25243;&#20986;&#24322;&#24120;&#65292;&#21017;&#20197;&#26410;&#25351;&#23450;&#39034;&#24207;&#26512;&#26500; <code>[ofirst, olast)</code> &#20013;&#24050;&#26500;&#36896;&#30340;&#35835;&#20889;&#12290;&#21478;&#22806;&#65292;&#22312;&#22987;&#20110; <code>ifirst</code> &#30340;&#33539;&#22260;&#20013;&#30340;&#24050;&#34987;&#31227;&#21160;&#30340;&#23545;&#35937;&#34987;&#32622;&#20110;&#21512;&#27861;&#20294;&#26410;&#25351;&#23450;&#30340;&#29366;&#24577;&#12290;</p>
<p>&#27492;&#39029;&#38754;&#19978;&#25551;&#36848;&#30340;&#20223;&#20989;&#25968;&#23454;&#20307;&#26159; <i>niebloid</i> &#65292;&#21363;&#65306;</p>
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<li>&#35843;&#29992;&#23427;&#20204;&#20013;&#30340;&#20219;&#20309;&#19968;&#32773;&#26102;&#19981;&#21487;&#25351;&#23450;&#26174;&#24335;&#27169;&#26495;&#23454;&#21442;&#12290;</li>
<li>&#23427;&#20204;&#26080;&#19968;&#23545;<a href="cpp-language-adl.html">&#23454;&#21442;&#20381;&#36182;&#26597;&#25214;</a>&#21487;&#35265;&#12290;</li>
<li>&#22312;<a href="cpp-language-unqualified_lookup.html">&#36890;&#24120;&#26080;&#38480;&#23450;&#26597;&#25214;</a>&#23547;&#25214;&#20989;&#25968;&#35843;&#29992;&#36816;&#31639;&#31526;&#24038;&#20391;&#30340;&#21517;&#31216;&#25214;&#21040;&#23427;&#20204;&#20043;&#19968;&#26102;&#65292;&#23427;&#31105;&#27490;<a href="cpp-language-adl.html">&#23454;&#21442;&#20381;&#36182;&#26597;&#25214;</a>&#12290;</li>
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<p>&#23454;&#38469;&#19978;&#65292;&#23427;&#20204;&#33021;&#20197;&#20989;&#25968;&#23545;&#35937;&#65292;&#25110;&#20197;&#26576;&#20123;&#29305;&#27530;&#32534;&#35793;&#22120;&#25193;&#23637;&#23454;&#29616;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>ifirst</td>
<td>-</td>
<td>&#35201;&#31227;&#21160;&#30340;&#36755;&#20837;&#33539;&#22260;&#30340;&#36215;&#22987;</td>
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<td>ofirst, olast</td>
<td>-</td>
<td>&#35201;&#21021;&#22987;&#21270;&#30340;&#36755;&#20837;&#33539;&#22260;</td>
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<td>n</td>
<td>-</td>
<td>&#35201;&#31227;&#21160;&#30340;&#20803;&#32032;&#25968;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">{</span>ifirst <span class="sy2">+</span> N, ofirst <span class="sy2">+</span> N<span class="br0">}</span></span></span> &#12290;</p>
<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">&#22797;&#26434;&#24230;</span></h3>
<p>&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">N</span></span> &#25104;&#32447;&#24615;&#12290;</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#26500;&#36896;&#30446;&#26631;&#33539;&#22260;&#20013;&#30340;&#20803;&#32032;&#26102;&#25243;&#20986;&#30340;&#24322;&#24120;&#65292;&#33509;&#23384;&#22312;&#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#33509;&#36755;&#20986;&#33539;&#22260;&#30340;&#20540;&#31867;&#22411;&#20026;<a href="cpp-named_req-TrivialType.html"><span style="font-style:italic">&#24179;&#20961;&#31867;&#22411;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(TrivialType)</span></a> &#65292;&#21017;&#23454;&#29616;&#21487;&#33021;&#25552;&#21319; <code>ranges::uninitialized_move_n</code> &#30340;&#25928;&#29575;&#65292;&#20363;&#22914;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">copy_n</span></span></span> &#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.AF.E8.83.BD.E7.9A.84.E5.AE.9E.E7.8E.B0">&#21487;&#33021;&#30340;&#23454;&#29616;</span></h3>
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<pre class="de1"><span class="kw1">struct</span> uninitialized_move_n_fn <span class="br0">{</span>
<span class="kw1">template</span> <span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">input_iterator</span> I, no<span class="sy2">-</span>throw<span class="sy2">-</span>forward<span class="sy2">-</span>iterator O,
no<span class="sy2">-</span>throw<span class="sy2">-</span>sentinel<span class="sy2">-</span><span class="kw1">for</span><span class="sy1">&lt;</span>O<span class="sy1">&gt;</span> S<span class="sy1">&gt;</span>
requires std<span class="sy4">::</span><span class="me2">constructible_from</span><span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">iter_value_t</span><span class="sy1">&lt;</span>O<span class="sy1">&gt;</span>,
std<span class="sy4">::</span><span class="me2">iter_rvalue_reference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;&gt;</span>
ranges<span class="sy4">::</span><span class="me2">uninitialized_move_n_result</span><span class="sy1">&lt;</span>I, O<span class="sy1">&gt;</span>
operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span> I ifirst, std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> n, O ofirst, S olast <span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span>
O current <span class="br0">{</span>ofirst<span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">try</span> <span class="br0">{</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="sy4">;</span> n<span class="sy2">--</span> <span class="sy1">&gt;</span> <span class="nu0">0</span> <span class="sy3">&amp;&amp;</span> current <span class="sy3">!</span><span class="sy1">=</span> olast<span class="sy4">;</span> <span class="sy2">++</span>ifirst, <span class="sy2">++</span>current<span class="br0">)</span>
<span class="sy4">::</span><span class="me2">new</span> <span class="br0">(</span><span class="kw1">const_cast</span><span class="sy1">&lt;</span><span class="kw4">void</span><span class="sy2">*</span><span class="sy1">&gt;</span><span class="br0">(</span><span class="kw1">static_cast</span><span class="sy1">&lt;</span><span class="kw4">const</span> <span class="kw4">volatile</span> <span class="kw4">void</span><span class="sy2">*</span><span class="sy1">&gt;</span>
<span class="br0">(</span><a href="cpp-memory-addressof.html"><span class="kw757">std::<span class="me2">addressof</span></span></a><span class="br0">(</span><span class="sy2">*</span>current<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span> <a href="cpp-types-remove_reference.html"><span class="kw607">std::<span class="me2">remove_reference_t</span></span></a><span class="sy1">&lt;</span>
std<span class="sy4">::</span><span class="me2">iter_reference_t</span><span class="sy1">&lt;</span>O<span class="sy1">&gt;&gt;</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>ifirst<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> <span class="br0">{</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>ifirst<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>current<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span> <span class="kw1">catch</span> <span class="br0">(</span>...<span class="br0">)</span> <span class="br0">{</span> <span class="co1">// &#22238;&#28378;&#65306;&#26512;&#26500;&#24050;&#26500;&#36896;&#30340;&#20803;&#32032;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="sy4">;</span> ofirst <span class="sy3">!</span><span class="sy1">=</span> current<span class="sy4">;</span> <span class="sy2">++</span>ofirst<span class="br0">)</span>
ranges<span class="sy4">::</span><span class="me2">destroy_at</span><span class="br0">(</span><a href="cpp-memory-addressof.html"><span class="kw757">std::<span class="me2">addressof</span></span></a><span class="br0">(</span><span class="sy2">*</span>ofirst<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">throw</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> uninitialized_move_n_fn uninitialized_move_n<span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span></pre></div>
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<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;cstdlib&gt;</span>
<span class="co2">#include &lt;iomanip&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;memory&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="kw4">void</span> print<span class="br0">(</span><span class="kw4">auto</span> rem, <span class="kw4">auto</span> first, <span class="kw4">auto</span> last<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> first <span class="sy3">!</span><span class="sy1">=</span> last<span class="sy4">;</span> <span class="sy2">++</span>first<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> <a href="cpp-io-manip-quoted.html"><span class="kw1802">std::<span class="me2">quoted</span></span></a><span class="br0">(</span><span class="sy2">*</span>first<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-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> in<span class="br0">[</span><span class="br0">]</span> <span class="br0">{</span> <span class="st0">&quot;No&quot;</span>, <span class="st0">&quot;Diagnostic&quot;</span>, <span class="st0">&quot;Required&quot;</span>, <span class="br0">}</span><span class="sy4">;</span>
print<span class="br0">(</span><span class="st0">&quot;initially, in: &quot;</span>, <a href="cpp-iterator-begin.html"><span class="kw676">std::<span class="me2">begin</span></span></a><span class="br0">(</span>in<span class="br0">)</span>, <a href="cpp-iterator-end.html"><span class="kw680">std::<span class="me2">end</span></span></a><span class="br0">(</span>in<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span>
<span class="kw4">constexpr</span> <span class="kw4">auto</span> sz <span class="sy1">=</span> <a href="cpp-iterator-size.html"><span class="kw684">std::<span class="me2">size</span></span></a><span class="br0">(</span>in<span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">void</span><span class="sy2">*</span> out <span class="sy1">=</span> <a href="cpp-memory-c-aligned_alloc.html"><span class="kw760">std::<span class="me2">aligned_alloc</span></span></a><span class="br0">(</span>alignof<span class="br0">(</span><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="br0">)</span>, sizeof<span class="br0">(</span><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="br0">)</span> <span class="sy2">*</span> sz<span class="br0">)</span>
<span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">try</span> <span class="br0">{</span>
<span class="kw4">auto</span> first <span class="br0">{</span><span class="kw1">static_cast</span><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="sy2">*</span><span class="sy1">&gt;</span><span class="br0">(</span>out<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">auto</span> last <span class="br0">{</span>first <span class="sy2">+</span> sz<span class="br0">}</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">uninitialized_move_n</span><span class="br0">(</span><a href="cpp-iterator-begin.html"><span class="kw676">std::<span class="me2">begin</span></span></a><span class="br0">(</span>in<span class="br0">)</span>, sz, first, last<span class="br0">)</span><span class="sy4">;</span>
print<span class="br0">(</span><span class="st0">&quot;after move, in: &quot;</span>, <a href="cpp-iterator-begin.html"><span class="kw676">std::<span class="me2">begin</span></span></a><span class="br0">(</span>in<span class="br0">)</span>, <a href="cpp-iterator-end.html"><span class="kw680">std::<span class="me2">end</span></span></a><span class="br0">(</span>in<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
print<span class="br0">(</span><span class="st0">&quot;after move, out: &quot;</span>, first, last<span class="br0">)</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">destroy</span><span class="br0">(</span>first, last<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">catch</span> <span class="br0">(</span>...<span class="br0">)</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> <span class="st0">&quot;Exception!<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="br0">}</span>
<a href="cpp-memory-c-free.html"><span class="kw763">std::<span class="me2">free</span></span></a><span class="br0">(</span>out<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span></pre></div>
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<p>&#21487;&#33021;&#30340;&#36755;&#20986;&#65306;</p>
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<pre class="de1">initially, in: &quot;No&quot; &quot;Diagnostic&quot; &quot;Required&quot;
after move, in: &quot;&quot; &quot;&quot; &quot;&quot;
after move, out: &quot;No&quot; &quot;Diagnostic&quot; &quot;Required&quot;</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-ranges-uninitialized_move.html"><span class="t-lines"><span>ranges::uninitialized_move</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</td>
<td>&#31227;&#21160;&#23545;&#35937;&#33539;&#22260;&#21040;&#26410;&#21021;&#22987;&#21270;&#30340;&#20869;&#23384;&#21306;&#22495;<br />
<span class="t-mark">(niebloid)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-uninitialized_move_n.html"><span class="t-lines"><span>uninitialized_move_n</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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</td>
<td>&#31227;&#21160;&#19968;&#23450;&#25968;&#37327;&#23545;&#35937;&#21040;&#26410;&#21021;&#22987;&#21270;&#20869;&#23384;&#21306;&#22495;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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