158 lines
17 KiB
HTML
158 lines
17 KiB
HTML
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<title>std::equal_to, not_equal_to, less, greater, less_equal, greater_equal(std::experimental::propagate_const)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>equal_to, not_equal_to, less, greater, less_equal, greater_equal<small>(std::experimental::propagate_const)</small></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a>‎ | <a href="cpp-experimental-propagate_const.html">propagate const</a></span></div>
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<div>定义于头文件 <code><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/header/experimental/propagate_const&action=edit&redlink=1" class="new" title="cpp/header/experimental/propagate const（页面不存在）"><experimental/propagate_const></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span> <span class="kw1">struct</span> equal_to<span class="sy1"><</span><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span> <span class="kw1">struct</span> not_equal_to<span class="sy1"><</span><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span> <span class="kw1">struct</span> less<span class="sy1"><</span><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span> <span class="kw1">struct</span> greater<span class="sy1"><</span><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span> <span class="kw1">struct</span> less_equal<span class="sy1"><</span><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span> <span class="kw1">struct</span> greater_equal<span class="sy1"><</span><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span></td>
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<p>为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">></span></span></span> 部分特化标准比较函数对象。</p>
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<p>令 <span class="t-c"><span class="mw-geshi cpp source-cpp">p.<span class="me1">t_</span></span></span> 代表 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">></span> p</span></span> 所包装的仿指针对象，则给定 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">></span></span></span> 类型的指针 <code>p</code> 和 <code>q</code> ，下列应当成立：</p>
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<ul>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-equal_to.html"><span class="kw1035">std::<span class="me2">equal_to</span></span></a><span class="sy1"><</span><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p, q<span class="br0">)</span> <span class="sy1">==</span> <a href="cpp-utility-functional-equal_to.html"><span class="kw1035">std::<span class="me2">equal_to</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p.<span class="me1">t_</span>, q.<span class="me1">t_</span><span class="br0">)</span></span></span></li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-not_equal_to.html"><span class="kw1036">std::<span class="me2">not_equal_to</span></span></a><span class="sy1"><</span><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p, q<span class="br0">)</span> <span class="sy1">==</span> <a href="cpp-utility-functional-not_equal_to.html"><span class="kw1036">std::<span class="me2">not_equal_to</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p.<span class="me1">t_</span>, q.<span class="me1">t_</span><span class="br0">)</span></span></span></li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-less.html"><span class="kw1039">std::<span class="me2">less</span></span></a><span class="sy1"><</span><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p, q<span class="br0">)</span> <span class="sy1">==</span> <a href="cpp-utility-functional-less.html"><span class="kw1039">std::<span class="me2">less</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p.<span class="me1">t_</span>, q.<span class="me1">t_</span><span class="br0">)</span></span></span></li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-greater.html"><span class="kw1037">std::<span class="me2">greater</span></span></a><span class="sy1"><</span><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p, q<span class="br0">)</span> <span class="sy1">==</span> <a href="cpp-utility-functional-greater.html"><span class="kw1037">std::<span class="me2">greater</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p.<span class="me1">t_</span>, q.<span class="me1">t_</span><span class="br0">)</span></span></span></li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-less_equal.html"><span class="kw1040">std::<span class="me2">less_equal</span></span></a><span class="sy1"><</span><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p, q<span class="br0">)</span> <span class="sy1">==</span> <a href="cpp-utility-functional-less_equal.html"><span class="kw1040">std::<span class="me2">less_equal</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p.<span class="me1">t_</span>, q.<span class="me1">t_</span><span class="br0">)</span></span></span></li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-greater_equal.html"><span class="kw1038">std::<span class="me2">greater_equal</span></span></a><span class="sy1"><</span><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p, q<span class="br0">)</span> <span class="sy1">==</span> <a href="cpp-utility-functional-greater_equal.html"><span class="kw1038">std::<span class="me2">greater_equal</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p.<span class="me1">t_</span>, q.<span class="me1">t_</span><span class="br0">)</span></span></span></li>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>这些特化确保 <code>T</code> 为指针类型时，这些类模板对 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-experimental-propagate_const.html"><span class="kw2423">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span></span></a><span class="sy1"><</span>T<span class="sy1">></span></span></span> 的特化产出全序，即使对应的内建运算符不如此。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-utility-functional-equal_to.html"><span class="t-lines"><span>equal_to</span></span></a></div>
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<td>实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1">==</span> y</span></span> 的函数对象<br />
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<span class="t-mark">(类模板)</span></td>
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<div><a href="cpp-utility-functional-not_equal_to.html"><span class="t-lines"><span>not_equal_to</span></span></a></div>
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<td>实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy3">!</span><span class="sy1">=</span> y</span></span> 的函数对象<br />
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<span class="t-mark">(类模板)</span></td>
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<div><a href="cpp-utility-functional-less.html"><span class="t-lines"><span>less</span></span></a></div>
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<td>实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1"><</span> y</span></span> 的函数对象<br />
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<div><a href="cpp-utility-functional-greater.html"><span class="t-lines"><span>greater</span></span></a></div>
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<td>实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1">></span> y</span></span> 的函数对象<br />
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<span class="t-mark">(类模板)</span></td>
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<div><a href="cpp-utility-functional-less_equal.html"><span class="t-lines"><span>less_equal</span></span></a></div>
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<td>实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1"><=</span> y</span></span> 的函数对象<br />
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<span class="t-mark">(类模板)</span></td>
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<div><a href="cpp-utility-functional-greater_equal.html"><span class="t-lines"><span>greater_equal</span></span></a></div>
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<td>实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1">>=</span> y</span></span> 的函数对象<br />
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<span class="t-mark">(类模板)</span></td>
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