klarkxy/hustoj
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
3256c00dcdf3190e1864c02ce50e1380b6b175cf
hustoj/web/cppreference-zh/chmhelp/cpp-algorithm-ranges-minmax.html
klarkxy 196e706fe4 上传cppreference
2025-08-01 12:57:54 +08:00

294 lines
28 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::ranges::minmax, std::ranges::minmax_result</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_algorithm_ranges_minmax 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::ranges::</span>minmax, <span style="font-size:0.7em; line-height:130%">std::ranges::</span>minmax_result</h1>
<div id="bodyContent">
<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>
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
<table class="t-dcl-begin">
<tbody>
<tr class="t-dsc-header">
<td>
<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-algorithm.html">&lt;algorithm&gt;</a></code></div>
</td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl-h">
<td>
<div>&#35843;&#29992;&#31614;&#21517;</div>
</td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T, <span class="kw1">class</span> Proj <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>,<br /></span>
<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">indirect_strict_weak_order</span><span class="sy1">&lt;</span><br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span><span class="kw4">const</span> T<span class="sy2">*</span>, Proj<span class="sy1">&gt;&gt;</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span> <span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> ranges<span class="sy4">::</span><span class="me2">minmax_result</span><span class="sy1">&lt;</span><span class="kw4">const</span> T<span class="sy3">&amp;</span><span class="sy1">&gt;</span><br /></p>
minmax<span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&amp;</span> a, <span class="kw4">const</span> T<span class="sy3">&amp;</span> b, Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj proj <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span> <span class="br0">)</span><span class="sy4">;</span></div>
</td>
<td>(1)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T, <span class="kw1">class</span> Proj <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>,<br /></span>
<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">indirect_strict_weak_order</span><span class="sy1">&lt;</span><br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span><span class="kw4">const</span> T<span class="sy2">*</span>, Proj<span class="sy1">&gt;&gt;</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span> <span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> ranges<span class="sy4">::</span><span class="me2">minmax_result</span><span class="sy1">&lt;</span><span class="kw4">const</span> T<span class="sy3">&amp;</span><span class="sy1">&gt;</span><br /></p>
minmax<span class="br0">(</span> <a href="cpp-utility-initializer_list.html"><span class="kw960">std::<span class="me2">initializer_list</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> r, Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj proj <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span> <span class="br0">)</span><span class="sy4">;</span></div>
</td>
<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td>
<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> R, <span class="kw1">class</span> Proj <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>,<br /></span>
<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">indirect_strict_weak_order</span><span class="sy1">&lt;</span><br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R<span class="sy1">&gt;</span>, Proj<span class="sy1">&gt;&gt;</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span> <span class="sy1">&gt;</span><br />
requires std<span class="sy4">::</span><span class="me2">indirectly_copyable_storable</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R<span class="sy1">&gt;</span>, ranges<span class="sy4">::</span><span class="me2">range_value_t</span><span class="sy1">&lt;</span>R<span class="sy1">&gt;</span><span class="sy2">*</span><span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> ranges<span class="sy4">::</span><span class="me2">minmax_result</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">range_value_t</span><span class="sy1">&lt;</span>R<span class="sy1">&gt;&gt;</span><br /></p>
minmax<span class="br0">(</span> R<span class="sy3">&amp;&amp;</span> r, Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj proj <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span> <span class="br0">)</span><span class="sy4">;</span></div>
</td>
<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl-h">
<td>
<div>&#36741;&#21161;&#31867;&#22411;</div>
</td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T <span class="sy1">&gt;</span><br />
<span class="kw1">using</span> minmax_result <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">min_max_result</span><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy4">;</span></span></div>
</td>
<td>(4)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>&#36820;&#22238;&#32473;&#23450;&#30340;&#25237;&#24433;&#21518;&#20540;&#30340;&#26368;&#23567;&#32773;&#19982;&#26368;&#22823;&#32773;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#36820;&#22238; <code>a</code> &#19982; <code>b</code> &#30340;&#36739;&#23567;&#32773;&#19982;&#36739;&#22823;&#32773;&#30340;&#24341;&#29992;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#36820;&#22238; initializer_list <code>r</code> &#20013;&#30340;&#26368;&#23567;&#19982;&#26368;&#22823;&#20540;&#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#36820;&#22238;&#33539;&#22260; <code>r</code> &#20013;&#30340;&#26368;&#23567;&#19982;&#26368;&#22823;&#20540;&#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="Parameters">Parameters</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>a, b</td>
<td>-</td>
<td>&#35201;&#27604;&#36739;&#30340;&#20540;</td>
</tr>
<tr class="t-par">
<td>r</td>
<td>-</td>
<td>&#35201;&#27604;&#36739;&#30340;&#38750;&#31354;&#30340;&#20540;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>comp</td>
<td>-</td>
<td>&#24212;&#29992;&#21040;&#25237;&#24433;&#21518;&#20803;&#32032;&#30340;&#20540;</td>
</tr>
<tr class="t-par">
<td>proj</td>
<td>-</td>
<td>&#24212;&#29992;&#21040;&#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>
<div class="t-li1"><span class="t-li">1)</span> &#33509;&#25353;&#29031;&#34987;&#25237;&#24433;&#20540; <code>b</code> &#23567;&#20110; <code>a</code> &#65292;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">{</span>b, a</span></span>} &#65307;&#21542;&#21017;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">{</span>a, b</span></span>} &#12290;</div>
<div class="t-li1"><span class="t-li">2-3)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">{</span>s, l</span></span>} &#65292;&#20854;&#20013; <code>s</code> &#19982; <code>l</code> &#20998;&#21035;&#20026; <code>r</code> &#20013;&#20998;&#21035;&#25353;&#29031;&#20854;&#34987;&#25237;&#24433;&#20540;&#30340;&#30340;&#26368;&#23567;&#19982;&#26368;&#22823;&#20540;&#12290;&#33509;&#25968;&#20010;&#20540;&#31561;&#20215;&#20110;&#26368;&#23567;&#19982;&#26368;&#22823;&#65292;&#21017;&#36820;&#22238;&#26368;&#24038;&#30340;&#26368;&#23567;&#20540;&#19982;&#26368;&#21491;&#30340;&#26368;&#22823;&#20540;&#12290;&#33509;&#33539;&#22260;&#20026;&#31354;&#65288;&#30001; <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>r<span class="br0">)</span></span></span> &#30830;&#23450;&#65289;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</div>
<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">&#22797;&#26434;&#24230;</span></h3>
<div class="t-li1"><span class="t-li">1)</span> &#33267;&#22810;&#27604;&#36739;&#19968;&#27425;&#24182;&#25237;&#24433;&#20108;&#27425;&#12290;</div>
<div class="t-li1"><span class="t-li">2-3)</span> &#33267;&#22810;&#27604;&#36739; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">3</span> <span class="sy2">/</span> <span class="nu0">2</span> <span class="sy2">*</span> ranges<span class="sy4">::</span><span class="me2">distance</span><span class="br0">(</span>r<span class="br0">)</span></span></span> &#27425;&#24182;&#19988;&#24212;&#29992;&#20004;&#20493;&#27425;&#25968;&#30340;&#25237;&#24433;&#12290;</div>
<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>
<table class="eq-fun-cpp-table">
<tr>
<td>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">struct</span> minmax_fn <span class="br0">{</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> Proj <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>,
std<span class="sy4">::</span><span class="me2">indirect_strict_weak_order</span><span class="sy1">&lt;</span>
std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span><span class="kw4">const</span> T<span class="sy2">*</span>, Proj<span class="sy1">&gt;&gt;</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span><span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> ranges<span class="sy4">::</span><span class="me2">minmax_result</span><span class="sy1">&lt;</span><span class="kw4">const</span> T<span class="sy3">&amp;</span><span class="sy1">&gt;</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>
<span class="kw4">const</span> T<span class="sy3">&amp;</span> a, <span class="kw4">const</span> T<span class="sy3">&amp;</span> b, Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj proj <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">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>proj, b<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>proj, a<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">return</span> <span class="br0">{</span>b, a<span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">return</span> <span class="br0">{</span>a, b<span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span> Proj <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>,
std<span class="sy4">::</span><span class="me2">indirect_strict_weak_order</span><span class="sy1">&lt;</span>
std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span><span class="kw4">const</span> T<span class="sy2">*</span>, Proj<span class="sy1">&gt;&gt;</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span><span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> ranges<span class="sy4">::</span><span class="me2">minmax_result</span><span class="sy1">&lt;</span><span class="kw4">const</span> T<span class="sy3">&amp;</span><span class="sy1">&gt;</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>
<a href="cpp-utility-initializer_list.html"><span class="kw960">std::<span class="me2">initializer_list</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> r, Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj proj <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="kw4">auto</span> result <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">minmax_element</span><span class="br0">(</span>r, <a href="cpp-utility-functional-ref.html"><span class="kw1069">std::<span class="me2">ref</span></span></a><span class="br0">(</span>comp<span class="br0">)</span>, <a href="cpp-utility-functional-ref.html"><span class="kw1069">std::<span class="me2">ref</span></span></a><span class="br0">(</span>proj<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><span class="sy2">*</span>result.<span class="me1">min</span><span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span><span class="sy2">*</span>result.<span class="me1">max</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> R, <span class="kw1">class</span> Proj <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>,
std<span class="sy4">::</span><span class="me2">indirect_strict_weak_order</span><span class="sy1">&lt;</span>
std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R<span class="sy1">&gt;</span>, Proj<span class="sy1">&gt;&gt;</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span><span class="sy1">&gt;</span>
requires std<span class="sy4">::</span><span class="me2">indirectly_copyable_storable</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R<span class="sy1">&gt;</span>,
ranges<span class="sy4">::</span><span class="me2">range_value_t</span><span class="sy1">&lt;</span>R<span class="sy1">&gt;</span><span class="sy2">*</span><span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> ranges<span class="sy4">::</span><span class="me2">minmax_result</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">range_value_t</span><span class="sy1">&lt;</span>R<span class="sy1">&gt;&gt;</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>
R<span class="sy3">&amp;&amp;</span> r, Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj proj <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="kw4">auto</span> result <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">minmax_element</span><span class="br0">(</span>r, <a href="cpp-utility-functional-ref.html"><span class="kw1069">std::<span class="me2">ref</span></span></a><span class="br0">(</span>comp<span class="br0">)</span>, <a href="cpp-utility-functional-ref.html"><span class="kw1069">std::<span class="me2">ref</span></span></a><span class="br0">(</span>proj<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><span class="sy2">*</span>result.<span class="me1">min</span><span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span><span class="sy2">*</span>result.<span class="me1">max</span><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> minmax_fn minmax<span class="sy4">;</span></pre></div>
</div>
</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#23545;&#20110;&#37325;&#36733; <span class="t-v">(1,2)</span> &#65292;&#33509;&#21442;&#25968;&#20043;&#19968;&#20026;&#20020;&#26102;&#37327;&#65292;&#21017;&#36820;&#22238;&#30340;&#24341;&#29992;&#22312;&#21547;&#26377;&#23545; <code>minmax</code> &#30340;&#35813;&#35843;&#29992;&#30340;&#23436;&#20840;&#34920;&#36798;&#24335;&#32467;&#26463;&#21518;&#21464;&#20026;&#24748;&#22402;&#24341;&#29992;&#12290;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="kw4">int</span> n <span class="sy1">=</span> <span class="nu0">1</span><span class="sy4">;</span>
<span class="kw4">auto</span> p <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">minmax</span><span class="br0">(</span>n, n<span class="sy2">+</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">int</span> m <span class="sy1">=</span> p.<span class="me1">first</span><span class="sy4">;</span> <span class="co1">// ok</span>
<span class="kw4">int</span> x <span class="sy1">=</span> p.<span class="me1">second</span><span class="sy4">;</span> <span class="co1">// &#26410;&#23450;&#20041;&#34892;&#20026;</span></pre></div>
</div>
<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;random&gt;</span>
<span class="co2">#include &lt;vector&gt;</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> v<span class="br0">{</span><span class="nu0">3</span>, <span class="nu0">1</span>, <span class="nu0">4</span>, <span class="nu0">9</span>, <span class="nu0">1</span>, <span class="nu0">5</span>, <span class="nu0">9</span>, <span class="nu0">2</span>, <span class="nu0">6</span><span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-numeric-random-mersenne_twister_engine.html"><span class="kw1490">std::<span class="me2">mt19937_64</span></span></a> generator<span class="sy4">;</span>
<span class="kw1">namespace</span> ranges <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">;</span>
<a href="cpp-numeric-random-uniform_int_distribution.html"><span class="kw1502">std::<span class="me2">uniform_int_distribution</span></span></a><span class="sy1">&lt;&gt;</span> distribution<span class="br0">(</span><span class="nu0">0</span>, ranges<span class="sy4">::</span><span class="me2">distance</span><span class="br0">(</span>v<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">auto</span> bounds <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">minmax</span><span class="br0">(</span>distribution<span class="br0">(</span>generator<span class="br0">)</span>, distribution<span class="br0">(</span>generator<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;v[&quot;</span> <span class="sy1">&lt;&lt;</span> bounds.<span class="me1">min</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;:&quot;</span> <span class="sy1">&lt;&lt;</span> bounds.<span class="me1">max</span> <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">int</span> i <span class="sy1">=</span> bounds.<span class="me1">min</span><span class="sy4">;</span> i <span class="sy1">&lt;</span> bounds.<span class="me1">max</span><span class="sy4">;</span> <span class="sy2">++</span>i<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> v<span class="br0">[</span>i<span class="br0">]</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">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="kw4">auto</span> <span class="br0">[</span>min, max<span class="br0">]</span> <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">minmax</span><span class="br0">(</span>v<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;smallest: &quot;</span> <span class="sy1">&lt;&lt;</span> min <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;largest: &quot;</span> <span class="sy1">&lt;&lt;</span> max <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></pre></div>
</div>
<p>&#21487;&#33021;&#30340;&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">v[2:7]: 4 9 1 5 9
smallest: 1
largest: 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-min.html"><span class="t-lines"><span>ranges::min</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>&#36820;&#22238;&#32473;&#23450;&#20540;&#30340;&#36739;&#23567;&#32773;<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-max.html"><span class="t-lines"><span>ranges::max</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>&#36820;&#22238;&#32473;&#23450;&#20540;&#30340;&#36739;&#22823;&#32773;<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-minmax_element.html"><span class="t-lines"><span>ranges::minmax_element</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>&#36820;&#22238;&#33539;&#22260;&#20013;&#30340;&#26368;&#23567;&#21644;&#26368;&#22823;&#20803;&#32032;<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-clamp.html"><span class="t-lines"><span>ranges::clamp</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;&#19968;&#23545;&#36793;&#30028;&#20540;&#38388;&#22841;&#19968;&#20010;&#20540;<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-minmax.html"><span class="t-lines"><span>minmax</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>&#36820;&#22238;&#20004;&#20010;&#20803;&#32032;&#30340;&#36739;&#23567;&#21644;&#36739;&#22823;&#32773;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
</table>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink