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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ranges::</span>set_difference, <span style="font-size:0.7em; line-height:130%">std::ranges::</span>set_difference_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 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> set_difference_result<span class="sy1">&lt;</span>I1, O<span class="sy1">&gt;</span><br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; set_difference<span class="br0">(</span> I1 first1, S1 last1, I2 first2, S2 last2,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 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; &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 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> set_difference_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>, O<span class="sy1">&gt;</span><br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; set_difference<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; &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> I, <span class="kw1">class</span> O<span class="sy1">&gt;</span><br />
<span class="kw1">using</span> set_difference_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>(3)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<p>&#20174;&#24050;&#25490;&#24207;&#30340;&#36755;&#20837;&#33539;&#22260; <code>[first1, last1)</code> &#36171;&#20540;&#22312;&#24050;&#25490;&#24207;&#30340;&#36755;&#20837;&#33539;&#22260; <code>[first2, last2)</code> &#20013;&#25214;&#19981;&#21040;&#30340;&#20803;&#32032;&#21040;&#22987;&#20110; <code>result</code> &#30340;&#36755;&#20986;&#33539;&#22260;&#12290;</p>
<p>&#33509;</p>
<ul>
<li>&#36755;&#20837;&#33539;&#22260;&#26410;&#20998;&#21035;&#30456;&#23545;&#20110; <code>comp</code> &#19982; <code>proj1</code> &#25110; <code>proj2</code> &#25490;&#24207;&#65292;&#25110;</li>
<li>&#32467;&#26524;&#33539;&#22260;&#19982;&#20219;&#19968;&#36755;&#20837;&#33539;&#22260;&#37325;&#21472;&#65292;</li>
</ul>
<p>&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#29992;&#32473;&#23450;&#30340;&#20108;&#20803;&#27604;&#36739;&#20989;&#25968; <code>comp</code> &#27604;&#36739;&#20803;&#32032;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#21516; <span class="t-v">(1)</span> &#65292;&#20294;&#20197; <code>r1</code> &#20026;&#31532;&#19968;&#33539;&#22260;&#65292;&#24182;&#20197; <code>r2</code> &#20026;&#31532;&#20108;&#33539;&#22260;&#65292;&#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>&#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>
<table class="t-par-begin">
<tr class="t-par">
<td>first1, last1</td>
<td>-</td>
<td>&#31532;&#19968;&#24050;&#25490;&#24207;&#36755;&#20837;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>first2, last2</td>
<td>-</td>
<td>&#31532;&#20108;&#24050;&#25490;&#24207;&#36755;&#20837;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>r1</td>
<td>-</td>
<td>&#31532;&#19968;&#24050;&#25490;&#24207;&#36755;&#20837;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>r2</td>
<td>-</td>
<td>&#31532;&#20108;&#24050;&#25490;&#24207;&#36755;&#20837;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>result</td>
<td>-</td>
<td>&#30446;&#26631;&#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;&#20803;&#32032;&#30340;&#25237;&#24433;</td>
</tr>
<tr class="t-par">
<td>proj2</td>
<td>-</td>
<td>&#24212;&#29992;&#21040;&#31532;&#20108;&#33539;&#22260;&#20803;&#32032;&#30340;&#25237;&#24433;</td>
</tr>
</table>
<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, 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;&#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>&#33267;&#22810;&#27604;&#36739;&#21644;&#24212;&#29992;&#27599;&#20010;&#25237;&#24433; <span class="mjax" style="display:none">\(\scriptsize 2\cdot(N_1+N_2)-1\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">2&middot;(N<span class="t-su t-su-b"><br />
1</span>+N<span class="t-su t-su-b"><br />
2</span>)-1</span> &#27425;&#65292;&#20854;&#20013; <span class="mjax" style="display:none">\(\scriptsize N_1\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">N<span class="t-su t-su-b"><br />
1</span></span> &#19982; <span class="mjax" style="display:none">\(\scriptsize N_2\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">N<span class="t-su t-su-b"><br />
2</span></span> &#20998;&#21035;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">distance</span><span class="br0">(</span>first1, last1<span class="br0">)</span></span></span> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">distance</span><span class="br0">(</span>first2, last2<span class="br0">)</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> set_difference_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">set_difference_result</span><span class="sy1">&lt;</span>I1, 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">while</span> <span class="br0">(</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="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>proj1, <span class="sy2">*</span>first1<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>proj2, <span class="sy2">*</span>first2<span class="br0">)</span><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>first1<span class="sy4">;</span> <span class="sy2">++</span>first1<span class="sy4">;</span> <span class="sy2">++</span>result<span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">else</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="br0">{</span>
<span class="sy2">++</span>first2<span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">else</span> <span class="br0">{</span>
<span class="sy2">++</span>first1<span class="sy4">;</span> <span class="sy2">++</span>first2<span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span>
<span class="kw1">return</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="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">set_difference_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>, 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> set_difference_fn set_difference<span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span></pre></div>
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</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;cassert&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;string_view&gt;</span>
<span class="co2">#include &lt;vector&gt;</span>
<span class="kw4">auto</span> print <span class="sy1">=</span> <span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&amp;</span> v, <a href="cpp-string-basic_string_view.html"><span class="kw1248">std::<span class="me2">string_view</span></span></a> end <span class="sy1">=</span> <span class="st0">&quot;&quot;</span><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> <span class="st0">&quot;{ &quot;</span><span class="sy4">;</span> <span class="kw4">auto</span> i <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> i <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">&quot;} &quot;</span> <span class="sy1">&lt;&lt;</span> end<span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">struct</span> Order <span class="co1">// &#25317;&#26377;&#38750;&#24120;&#26377;&#36259;&#30340;&#25968;&#25454;&#30340;&#31867;</span>
<span class="br0">{</span>
<span class="kw4">int</span> order_id<span class="sy4">;</span>
<span class="kw1">friend</span> <a href="cpp-io-basic_ostream.html"><span class="kw1729">std::<span class="me2">ostream</span></span></a><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span><a href="cpp-io-basic_ostream.html"><span class="kw1729">std::<span class="me2">ostream</span></span></a><span class="sy3">&amp;</span> os, <span class="kw4">const</span> Order<span class="sy3">&amp;</span> ord<span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">return</span> os <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;{&quot;</span> <span class="sy1">&lt;&lt;</span> ord.<span class="me1">order_id</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;},&quot;</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">const</span> <span class="kw4">auto</span> v1 <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">5</span>, <span class="nu0">5</span>, <span class="nu0">5</span>, <span class="nu0">9</span><span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">const</span> <span class="kw4">auto</span> v2 <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">2</span>, <span class="nu0">5</span>, <span class="nu0">7</span><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><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> diff<span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">set_difference</span><span class="br0">(</span>v1, v2, <a href="cpp-iterator-back_inserter.html"><span class="kw665">std::<span class="me2">back_inserter</span></span></a><span class="br0">(</span>diff<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
print<span class="br0">(</span>v1, <span class="st0">&quot;&#8726; &quot;</span><span class="br0">)</span><span class="sy4">;</span>
print<span class="br0">(</span>v2, <span class="st0">&quot;= &quot;</span><span class="br0">)</span><span class="sy4">;</span>
print<span class="br0">(</span>diff, <span class="st0">&quot;<span class="es1">\n</span>&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#25105;&#20204;&#24819;&#30693;&#36947;&#21738;&#20123;&#39034;&#24207;&#22312;&#26087;&#21644;&#26032;&#29366;&#24577;&#20043;&#38388;&ldquo;&#25913;&#21464;&#20102;&rdquo;&#65306;</span>
<span class="kw4">const</span> <a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a><span class="sy1">&lt;</span>Order<span class="sy1">&gt;</span> old_orders <span class="br0">{</span> <span class="br0">{</span><span class="nu0">1</span><span class="br0">}</span>, <span class="br0">{</span><span class="nu0">2</span><span class="br0">}</span>, <span class="br0">{</span><span class="nu0">5</span><span class="br0">}</span>, <span class="br0">{</span><span class="nu0">9</span><span class="br0">}</span>, <span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">const</span> <a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a><span class="sy1">&lt;</span>Order<span class="sy1">&gt;</span> new_orders <span class="br0">{</span> <span class="br0">{</span><span class="nu0">2</span><span class="br0">}</span>, <span class="br0">{</span><span class="nu0">5</span><span class="br0">}</span>, <span class="br0">{</span><span class="nu0">7</span><span class="br0">}</span>, <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><span class="sy1">&lt;</span>Order<span class="sy1">&gt;</span> cut_orders<span class="br0">(</span>old_orders.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> new_orders.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">auto</span> <span class="br0">[</span>old_orders_end, cut_orders_last<span class="br0">]</span> <span class="sy1">=</span>
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">set_difference</span><span class="br0">(</span>old_orders, new_orders,
cut_orders.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, <span class="br0">{</span><span class="br0">}</span>,
<span class="sy3">&amp;</span>Order<span class="sy4">::</span><span class="me2">order_id</span>, <span class="sy3">&amp;</span>Order<span class="sy4">::</span><span class="me2">order_id</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>old_orders_end <span class="sy1">==</span> old_orders.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</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">&quot;old orders = &quot;</span><span class="sy4">;</span> print<span class="br0">(</span>old_orders, <span class="st0">&quot;<span class="es1">\n</span>&quot;</span><span class="br0">)</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">&quot;new orders = &quot;</span><span class="sy4">;</span> print<span class="br0">(</span>new_orders, <span class="st0">&quot;<span class="es1">\n</span>&quot;</span><span class="br0">)</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">&quot;cut orders = &quot;</span><span class="sy4">;</span> print<span class="br0">(</span>cut_orders, <span class="st0">&quot;<span class="es1">\n</span>&quot;</span><span class="br0">)</span><span class="sy4">;</span>
cut_orders.<span class="me1">erase</span><span class="br0">(</span>cut_orders_last, end<span class="br0">(</span>cut_orders<span class="br0">)</span><span class="br0">)</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">&quot;cut orders = &quot;</span><span class="sy4">;</span> print<span class="br0">(</span>cut_orders, <span class="st0">&quot;<span class="es1">\n</span>&quot;</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 5 5 5 9 } &#8726; { 2 5 7 } = { 1 5 5 9 }
old orders = { {1}, {2}, {5}, {9}, }
new orders = { {2}, {5}, {7}, }
cut orders = { {1}, {9}, {0}, {0}, {0}, {0}, {0}, }
cut orders = { {1}, {9}, }</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-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-set_intersection.html"><span class="t-lines"><span>ranges::set_intersection</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;&#20132;&#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-set_symmetric_difference.html"><span class="t-lines"><span>ranges::set_symmetric_difference</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;&#23545;&#31216;&#24046;<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-includes.html"><span class="t-lines"><span>ranges::includes</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>&#33509;&#19968;&#20010;&#24207;&#21015;&#26159;&#21478;&#19968;&#20010;&#30340;&#23376;&#21015;&#21017;&#36820;&#22238; <code>true</code><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-set_difference.html"><span class="t-lines"><span>set_difference</span></span></a></div>
</div>
</td>
<td>&#35745;&#31639;&#20004;&#20010;&#38598;&#21512;&#30340;&#24046;&#38598;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
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