73 lines
6.1 KiB
HTML
73 lines
6.1 KiB
HTML
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<title>operator==, operator<=>(std::stacktrace_entry)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_utility_stacktrace_entry_operator_cmp skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading">operator==, operator<=><small>(std::stacktrace_entry)</small></h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-utility.html">utility</a>‎ | <a href="cpp-utility-stacktrace_entry.html">stacktrace entry</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span> <span class="kw4">const</span> stacktrace_entry<span class="sy3">&</span> lhs,<br />
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<span class="kw4">const</span> stacktrace_entry<span class="sy3">&</span> rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx23">(C++23 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">friend</span> <span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">strong_ordering</span><br />
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operator<span class="sy1"><=></span><span class="br0">(</span> <span class="kw4">const</span> stacktrace_entry<span class="sy3">&</span> lhs, <span class="kw4">const</span> stacktrace_entry<span class="sy3">&</span> rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx23">(C++23 起)</span></td>
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<td></td>
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<td></td>
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<td></td>
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<div class="t-li1"><span class="t-li">1)</span> 比较 <code>lhs</code> 与 <code>rhs</code> 的相等性。二个 <code>stacktrace_entry</code> 值相等当且仅当它们表示同一栈踪条目，或均为空。</div>
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<div class="t-li1"><span class="t-li">2)</span> 获取 <code>lhs</code> 与 <code>rhs</code> 在的所有 <code>stacktrace_entry</code> 值上的未指定的严格全序中的相对顺序，该序与 <code>operator==</code> 所建立的等价关系一致。</div>
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<p>这些函数对通常<a href="cpp-language-unqualified_lookup.html">无限定</a>或<a href="cpp-language-qualified_lookup.html">有限定查找</a>不可见，而只能在 <code>std::stacktrace_entry</code> 为参数的关联类时由<a href="cpp-language-adl.html">实参依赖查找</a>找到。</p>
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<p><code><</code>、 <code><=</code>、 <code>></code>、 <code>>=</code> 及 <code>!=</code> 运算符分别从 <code>operator<=></code> 与 <code>operator==</code> <a href="cpp-language-operators.html#.E5.85.B3.E7.B3.BB.E8.BF.90.E7.AE.97.E7.AC.A6">合成</a>。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>lhs, rhs</td>
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<td>-</td>
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<td>要比较的 <code>stacktrace_entry</code> 值</td>
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</tr>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<div class="t-li1"><span class="t-li">1)</span> 若 <code>lhs</code> 与 <code>rhs</code> 比较相等则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，否则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 若 <code>lhs</code> 与 <code>rhs</code> 比较相等则为 <span class="t-lc">std::strong_ordering::equal</span> 。</div>
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<div class="t-li1"><span class="t-li"></span> 否则，若 <code>lhs</code> 在严格全序中顺序先于 <code>rhs</code> 则为 <span class="t-lc">std::strong_ordering::less</span> 。</div>
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<div class="t-li1"><span class="t-li"></span> 否则为 <span class="t-lc">std::strong_ordering::greater</span> （该情况下 <code>rhs</code> 在严格全序中顺序先于 <code>lhs</code> ）。</div>
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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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