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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ranges::</span>merge, <span style="font-size:0.7em; line-height:130%">std::ranges::</span>merge_result</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-algorithm.html">algorithm</a>&lrm; | <a href="cpp-algorithm-ranges.html">ranges</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-algorithm.html">&lt;algorithm&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> I1, std<span class="sy4">::</span><span class="me2">sentinel_for</span><span class="sy1">&lt;</span>I1<span class="sy1">&gt;</span> S1,<br /></span>
<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">input_iterator</span> I2, std<span class="sy4">::</span><span class="me2">sentinel_for</span><span class="sy1">&lt;</span>I2<span class="sy1">&gt;</span> S2,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">weakly_incrementable</span> O, <span class="kw1">class</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">class</span> Proj1 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>, <span class="kw1">class</span> Proj2 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span> <span class="sy1">&gt;</span><br />
requires &nbsp;std<span class="sy4">::</span><span class="me2">mergeable</span><span class="sy1">&lt;</span>I1, I2, O, Comp, Proj1, Proj2<span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> merge_result<span class="sy1">&lt;</span>I1, I2, O<span class="sy1">&gt;</span><br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; merge<span class="br0">(</span> I1 first1, S1 last1, I2 first2, S2 last2, O result, Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Proj1 proj1 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj2 proj2 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span> <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><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> ranges<span class="sy4">::</span><span class="me2">input_range</span> R1, ranges<span class="sy4">::</span><span class="me2">input_range</span> R2,<br /></span>
<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">weakly_incrementable</span> O, <span class="kw1">class</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">class</span> Proj1 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>, <span class="kw1">class</span> Proj2 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span> <span class="sy1">&gt;</span><br />
requires &nbsp;std<span class="sy4">::</span><span class="me2">mergeable</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R1<span class="sy1">&gt;</span>, ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R2<span class="sy1">&gt;</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; O, Comp, Proj1, Proj2<span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> merge_result<span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">borrowed_iterator_t</span><span class="sy1">&lt;</span>R1<span class="sy1">&gt;</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;ranges<span class="sy4">::</span><span class="me2">borrowed_iterator_t</span><span class="sy1">&lt;</span>R2<span class="sy1">&gt;</span>, O<span class="sy1">&gt;</span><br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; merge<span class="br0">(</span> R1<span class="sy3">&amp;&amp;</span> r1, R2<span class="sy3">&amp;&amp;</span> r2, O result, Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Proj1 proj1 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj2 proj2 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span> <span class="br0">)</span><span class="sy4">;</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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<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> I1, <span class="kw1">class</span> I2, <span class="kw1">class</span> O<span class="sy1">&gt;</span><br />
<span class="kw1">using</span> merge_result <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">in_in_out_result</span><span class="sy1">&lt;</span>I1, I2, O<span class="sy1">&gt;</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<p>&#23558;&#20004;&#20010;<i>&#24050;&#25490;&#24207;</i>&#33539;&#22260; <code>[first1, last1)</code> &#21644; <code>[first2, last2)</code> &#24402;&#24182;&#20026;&#19968;&#20010;&#24320;&#22987;&#20110; <code>result</code> &#30340;<i>&#24050;&#25490;&#24207;</i>&#33539;&#22260;&#12290;</p>
<p>&#19968;&#20010;&#24207;&#21015;&#34987;&#31216;&#20026;&#20851;&#20110; <code>comp</code> <i>&#24050;&#25490;&#24207;</i>&#65292;&#22914;&#26524;&#23545;&#20110;&#20219;&#20309;&#25351;&#21521;&#35813;&#24207;&#21015;&#30340;&#36845;&#20195;&#22120; <code>it</code> &#21644;&#20219;&#20309;&#38750;&#36127;&#25972;&#25968; <code>n</code> &#65292;&#20196; <code>it + n</code> &#20026;&#19968;&#20010;&#25351;&#21521;&#35813;&#24207;&#21015;&#20013;&#30340;&#23545;&#35937;&#30340;&#26377;&#25928;&#36845;&#20195;&#22120;&#65292; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-invoke.html"><span class="kw1058">std::<span class="me2">invoke</span></span></a><span class="br0">(</span>comp, <a href="cpp-utility-functional-invoke.html"><span class="kw1058">std::<span class="me2">invoke</span></span></a><span class="br0">(</span>proj2, <span class="sy2">*</span><span class="br0">(</span>it <span class="sy2">+</span> n<span class="br0">)</span><span class="br0">)</span>, <a href="cpp-utility-functional-invoke.html"><span class="kw1058">std::<span class="me2">invoke</span></span></a><span class="br0">(</span>proj1, <span class="sy2">*</span>it<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span></span></span> &#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> &#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#29992;&#20108;&#20803;&#27604;&#36739;&#20989;&#25968; <code>comp</code> &#36827;&#34892;&#23545;&#35937;&#30340;&#27604;&#36739;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#21516; <span class="t-v">(1)</span> &#65292;&#20294;&#26159;&#20197; <code>r1</code> &#20026;&#31532;&#19968;&#20010;&#33539;&#22260;&#24182;&#20197; <code>r2</code> &#20026;&#31532;&#20108;&#20010;&#33539;&#22260;, &#22914;&#21516;&#20197; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>r1<span class="br0">)</span></span></span> &#20026; <code>first1</code> &#65292;&#20197; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>r1<span class="br0">)</span></span></span> &#20026; <code>last1</code> &#65292;&#20197; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>r2<span class="br0">)</span></span></span> &#20026; <code>first2</code> &#65292;&#24182;&#20197; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>r2<span class="br0">)</span></span></span> &#20026; <code>last2</code> &#12290;</div>
<p>&#33509;&#30446;&#26631;&#33539;&#22260;&#19982;&#20219;&#19968;&#36755;&#20837;&#33539;&#22260;&#37325;&#21472;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#65288;&#36755;&#20837;&#33539;&#22260;&#21487;&#20197;&#24444;&#27492;&#37325;&#21472;&#65289;&#12290;</p>
<p>&#36825;&#20010;&#24402;&#24182;&#20989;&#25968;&#26159; <i>&#31283;&#23450;</i>&#30340;&#65292;&#24847;&#21619;&#30528;&#23545;&#20110;&#20004;&#20010;&#33539;&#22260;&#20013;&#30340;&#31561;&#20215;&#23545;&#35937;&#65292;&#26469;&#33258;&#31532;&#19968;&#20010;&#33539;&#22260;&#30340;&#23545;&#35937;(&#20445;&#25345;&#26412;&#36523;&#30340;&#25490;&#24207;&#29366;&#20917;) &#23558;&#25490;&#22312;&#31532;&#20108;&#20010;&#33539;&#22260;&#24403;&#20013;&#30340;&#23545;&#35937;&#20043;&#21069;&#65288;&#20445;&#25345;&#20854;&#21407;&#20808;&#39034;&#24207;&#65289;&#12290;</p>
<p>&#27492;&#39029;&#38754;&#19978;&#25551;&#36848;&#30340;&#20223;&#20989;&#25968;&#23454;&#20307;&#26159; <i>niebloid</i> &#65292;&#21363;&#65306;</p>
<ul>
<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>
</ul>
<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>first1, last1</td>
<td>-</td>
<td>&#31532;&#19968;&#24050;&#25490;&#24207;&#30340;&#36755;&#20837;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>first2, last2</td>
<td>-</td>
<td>&#31532;&#20108;&#24050;&#25490;&#24207;&#30340;&#36755;&#20837;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>result</td>
<td>-</td>
<td>&#36755;&#20986;&#33539;&#22260;&#30340;&#36215;&#22987;</td>
</tr>
<tr class="t-par">
<td>comp</td>
<td>-</td>
<td>&#24212;&#29992;&#21040;&#25237;&#24433;&#21518;&#20803;&#32032;&#30340;&#27604;&#36739;&#22120;</td>
</tr>
<tr class="t-par">
<td>proj1</td>
<td>-</td>
<td>&#24212;&#29992;&#21040;&#31532;&#19968;&#33539;&#22260;&#20013;&#20803;&#32032;&#30340;&#25237;&#24433;</td>
</tr>
<tr class="t-par">
<td>proj2</td>
<td>-</td>
<td>&#24212;&#29992;&#21040;&#31532;&#20108;&#33539;&#22260;&#20013;&#20803;&#32032;&#30340;&#25237;&#24433;</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>last1, last2, result_last<span class="br0">}</span></span></span>&#65292;&#20854;&#20013; <span class="t-c"><span class="mw-geshi cpp source-cpp">result_last</span></span> &#20026;&#34987;&#26500;&#36896;&#30340;&#33539;&#22260;&#26411;&#23614;&#12290;</p>
<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">&#22797;&#26434;&#24230;</span></h3>
<p>&#26368;&#22810; <span class="t-c"><span class="mw-geshi cpp source-cpp">N&minus;<span class="nu0">1</span></span></span> &#27425;&#27604;&#36739;&#21644;&#25237;&#24433;&#30340;&#24212;&#29992;&#65292;&#20854;&#20013; <span class="t-c"><span class="mw-geshi cpp source-cpp">N <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">distance</span><span class="br0">(</span>first1, last1<span class="br0">)</span> <span class="sy2">+</span> ranges<span class="sy4">::</span><span class="me2">distance</span><span class="br0">(</span>first2, last12<span class="br0">)</span></span></span>&#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#27492;&#31639;&#27861;&#36827;&#34892;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">set_union</span></span></span> &#30456;&#20284;&#30340;&#20219;&#21153;&#12290;&#20004;&#32773;&#37117;&#20351;&#29992;&#20004;&#20010;&#24050;&#25490;&#24207;&#30340;&#33539;&#22260;&#20135;&#29983;&#19968;&#20010;&#21253;&#21547;&#20004;&#32773;&#30340;&#23545;&#35937;&#30340;&#24050;&#25490;&#24207;&#33539;&#22260;&#12290;&#20004;&#20010;&#31639;&#27861;&#30340;&#19981;&#21516;&#20043;&#22788;&#22312;&#20110;&#22312;&#20004;&#20010;&#36755;&#20837;&#33539;&#22260;&#24403;&#20013;&#30340;&#27604;&#36739;&#31561;&#20215;&#30340;&#20540;&#30340;&#22788;&#29702;&#26041;&#27861;&#65288;&#21487;&#20197;&#21442;&#32771;<a href="cpp-named_req-LessThanComparable.html"><span style="font-style:italic">&#21487;&#23567;&#20110;&#27604;&#36739;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(LessThanComparable)</span></a> &#19978;&#30340;&#27880;&#35299;&#65289;&#12290;&#22914;&#26524;&#20219;&#20309;&#30456;&#31561;&#30340;&#20540;&#20986;&#29616;&#20102; <span class="t-c"><span class="mw-geshi cpp source-cpp">n</span></span> &#27425;&#20110;&#31532;&#19968;&#20010;&#33539;&#22260;&#32780; <span class="t-c"><span class="mw-geshi cpp source-cpp">m</span></span> &#27425;&#20110;&#31532;&#20108;&#20010;&#65292; <span class="t-lc">ranges::merge</span> &#23558;&#20250;&#36755;&#20986;&#20840;&#37096;&#30340; <span class="t-c"><span class="mw-geshi cpp source-cpp">n<span class="sy2">+</span>m</span></span> &#27425;&#20986;&#29616;&#65292;&#20294;&#26159;<span class="t-lc">ranges::set_union</span> &#21482;&#20250;&#36755;&#20986; <span class="t-c"><span class="mw-geshi cpp source-cpp">max<span class="br0">(</span>n, m<span class="br0">)</span></span></span> &#27425;&#12290;&#25152;&#20197; <span class="t-lc">ranges::merge</span> &#36755;&#20986;&#24688;&#22909; <span class="t-c"><span class="mw-geshi cpp source-cpp">N</span></span> &#20010;&#25968;&#20540;&#32780; <span class="t-lc">ranges::set_union</span> &#20250;&#36755;&#20986;&#26356;&#23569;&#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> merge_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> I1, std<span class="sy4">::</span><span class="me2">sentinel_for</span><span class="sy1">&lt;</span>I1<span class="sy1">&gt;</span> S1,
std<span class="sy4">::</span><span class="me2">input_iterator</span> I2, std<span class="sy4">::</span><span class="me2">sentinel_for</span><span class="sy1">&lt;</span>I2<span class="sy1">&gt;</span> S2,
std<span class="sy4">::</span><span class="me2">weakly_incrementable</span> O, <span class="kw1">class</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span>,
<span class="kw1">class</span> Proj1 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>, <span class="kw1">class</span> Proj2 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span> <span class="sy1">&gt;</span>
requires std<span class="sy4">::</span><span class="me2">mergeable</span><span class="sy1">&lt;</span>I1, I2, O, Comp, Proj1, Proj2<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> ranges<span class="sy4">::</span><span class="me2">merge_result</span><span class="sy1">&lt;</span>I1, I2, O<span class="sy1">&gt;</span>
operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span> I1 first1, S1 last1, I2 first2, S2 last2, O result, Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>,
Proj1 proj1 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj2 proj2 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span> <span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="sy4">;</span> <span class="sy3">!</span><span class="br0">(</span>first1 <span class="sy1">==</span> last1 or first2 <span class="sy1">==</span> last2<span class="br0">)</span><span class="sy4">;</span> <span class="sy2">++</span>result<span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">if</span> <span class="br0">(</span><a href="cpp-utility-functional-invoke.html"><span class="kw1058">std::<span class="me2">invoke</span></span></a><span class="br0">(</span>comp, <a href="cpp-utility-functional-invoke.html"><span class="kw1058">std::<span class="me2">invoke</span></span></a><span class="br0">(</span>proj2, <span class="sy2">*</span>first2<span class="br0">)</span>, <a href="cpp-utility-functional-invoke.html"><span class="kw1058">std::<span class="me2">invoke</span></span></a><span class="br0">(</span>proj1, <span class="sy2">*</span>first1<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span>
<span class="sy2">*</span>result <span class="sy1">=</span> <span class="sy2">*</span>first2, <span class="sy2">++</span>first2<span class="sy4">;</span>
<span class="kw1">else</span>
<span class="sy2">*</span>result <span class="sy1">=</span> <span class="sy2">*</span>first1, <span class="sy2">++</span>first1<span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">auto</span> ret1 <span class="br0">{</span>ranges<span class="sy4">::</span><span class="me2">copy</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>first1<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>last1<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>result<span class="br0">)</span><span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">auto</span> ret2 <span class="br0">{</span>ranges<span class="sy4">::</span><span class="me2">copy</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>first2<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>last2<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>ret1.<span class="me1">out</span><span class="br0">)</span><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>ret1.<span class="me1">in</span><span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>ret2.<span class="me1">in</span><span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>ret2.<span class="me1">out</span><span class="br0">)</span> <span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">template</span><span class="sy1">&lt;</span> ranges<span class="sy4">::</span><span class="me2">input_range</span> R1, ranges<span class="sy4">::</span><span class="me2">input_range</span> R2, std<span class="sy4">::</span><span class="me2">weakly_incrementable</span> O,
<span class="kw1">class</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span>,
<span class="kw1">class</span> Proj1 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>, <span class="kw1">class</span> Proj2 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span> <span class="sy1">&gt;</span>
requires std<span class="sy4">::</span><span class="me2">mergeable</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R1<span class="sy1">&gt;</span>, ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R2<span class="sy1">&gt;</span>,
O, Comp, Proj1, Proj2<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> ranges<span class="sy4">::</span><span class="me2">merge_result</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">borrowed_iterator_t</span><span class="sy1">&lt;</span>R1<span class="sy1">&gt;</span>,
ranges<span class="sy4">::</span><span class="me2">borrowed_iterator_t</span><span class="sy1">&lt;</span>R2<span class="sy1">&gt;</span>, O<span class="sy1">&gt;</span>
operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span> R1<span class="sy3">&amp;&amp;</span> r1, R2<span class="sy3">&amp;&amp;</span> r2, O result, Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>,
Proj1 proj1 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj2 proj2 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span> <span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span>
<span class="kw1">return</span> <span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>r1<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>r1<span class="br0">)</span>,
ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>r2<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>r2<span class="br0">)</span>,
std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>result<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>comp<span class="br0">)</span>,
std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>proj1<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>proj2<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> merge_fn merge<span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span></pre></div>
</div>
</td>
</tr>
</table>
<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;algorithm&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;vector&gt;</span>
<span class="kw4">void</span> print<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&amp;</span> in1, <span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&amp;</span> in2, <span class="kw4">auto</span> first, <span class="kw4">auto</span> last<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;{ &quot;</span><span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&amp;</span> e <span class="sy4">:</span> in1<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> e <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</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;} +<span class="es1">\n</span>{ &quot;</span><span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&amp;</span> e <span class="sy4">:</span> in2<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> e <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</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;} =<span class="es1">\n</span>{ &quot;</span><span class="sy4">;</span>
<span class="kw1">while</span> <span class="br0">(</span><span class="sy3">!</span><span class="br0">(</span>first <span class="sy1">==</span> last<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="sy2">*</span>first<span class="sy2">++</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</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;}<span class="es1">\n</span><span class="es1">\n</span>&quot;</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><span class="kw4">int</span><span class="sy1">&gt;</span> in1, in2, out<span class="sy4">;</span>
in1 <span class="sy1">=</span> <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>
in2 <span class="sy1">=</span> <span class="br0">{</span> <span class="nu0">3</span>, <span class="nu0">4</span>, <span class="nu0">5</span>, <span class="nu0">6</span>, <span class="nu0">7</span><span class="br0">}</span><span class="sy4">;</span>
out.<span class="me1">resize</span><span class="br0">(</span>in1.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> in2.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">const</span> <span class="kw4">auto</span> ret <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">merge</span><span class="br0">(</span>in1, in2, out.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
print<span class="br0">(</span>in1, in2, out.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, ret.<span class="me1">out</span><span class="br0">)</span><span class="sy4">;</span>
in1 <span class="sy1">=</span> <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="nu0">5</span>, <span class="nu0">5</span><span class="br0">}</span><span class="sy4">;</span>
in2 <span class="sy1">=</span> <span class="br0">{</span> <span class="nu0">3</span>, <span class="nu0">4</span>, <span class="nu0">5</span>, <span class="nu0">6</span>, <span class="nu0">7</span><span class="br0">}</span><span class="sy4">;</span>
out.<span class="me1">clear</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
out.<span class="me1">reserve</span><span class="br0">(</span>in1.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> in2.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><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">merge</span><span class="br0">(</span>in1, in2, <a href="cpp-iterator-back_inserter.html"><span class="kw665">std::<span class="me2">back_inserter</span></span></a><span class="br0">(</span>out<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
print<span class="br0">(</span>in1, in2, out.<span class="me1">cbegin</span><span class="br0">(</span><span class="br0">)</span>, out.<span class="me1">cend</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</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 2 3 4 5 } +
{ 3 4 5 6 7 } =
{ 1 2 3 3 4 4 5 5 6 7 }
{ 1 2 3 4 5 5 5 } +
{ 3 4 5 6 7 } =
{ 1 2 3 3 4 4 5 5 5 5 6 7 }</pre></div>
</div>
</div>
<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-algorithm-ranges-inplace_merge.html"><span class="t-lines"><span>ranges::inplace_merge</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#22312;&#21407;&#20301;&#24402;&#24182;&#20004;&#20010;&#26377;&#24207;&#33539;&#22260;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-is_sorted.html"><span class="t-lines"><span>ranges::is_sorted</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#26816;&#26597;&#33539;&#22260;&#26159;&#21542;&#20197;&#21319;&#24207;&#25490;&#24207;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-set_union.html"><span class="t-lines"><span>ranges::set_union</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#35745;&#31639;&#20004;&#20010;&#38598;&#21512;&#30340;&#24182;&#38598;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-sort.html"><span class="t-lines"><span>ranges::sort</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#23558;&#33539;&#22260;&#25353;&#21319;&#24207;&#25490;&#24207;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-stable_sort.html"><span class="t-lines"><span>ranges::stable_sort</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#23558;&#33539;&#22260;&#20869;&#30340;&#20803;&#32032;&#25490;&#24207;&#65292;&#21516;&#26102;&#20445;&#25345;&#30456;&#31561;&#30340;&#20803;&#32032;&#20043;&#38388;&#30340;&#39034;&#24207;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-merge.html"><span class="t-lines"><span>merge</span></span></a></div>
</div>
</td>
<td>&#24402;&#24182;&#20004;&#20010;&#24050;&#25490;&#24207;&#30340;&#33539;&#22260;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
</table>
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<div class="visualClear"></div>
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