72 lines
6.2 KiB
HTML
72 lines
6.2 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<title>operator-(ranges::elements_view::sentinel)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_ranges_elements_view_sentinel_operator- skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading">operator-<small>(ranges::elements_view::<i>sentinel</i>)</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-ranges.html">ranges</a>‎ | <a href="cpp-ranges-elements_view.html">elements view</a>‎ | <a href="cpp-ranges-elements_view-sentinel.html">sentinel</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw4">bool</span> OtherConst <span class="sy1">></span><br /></span>
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<p> requires std<span class="sy4">::</span><span class="me2">sized_sentinel_for</span><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">sentinel_t</span><span class="sy1"><</span>Base<span class="sy1">></span>,<br />
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ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span><span class="coMULTI">/*maybe-const*/</span><span class="sy1"><</span>OtherConst, V<span class="sy1">>>></span><br />
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> ranges<span class="sy4">::</span><span class="me2">range_difference_t</span><span class="sy1"><</span><span class="coMULTI">/*maybe-const*/</span><span class="sy1"><</span>OtherConst, V<span class="sy1">>></span><br /></p>
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operator<span class="sy2">-</span><span class="br0">(</span> <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy1"><</span>OtherConst<span class="sy1">></span><span class="sy3">&</span> x, <span class="kw4">const</span> <span class="coMULTI">/*sentinel*/</span><span class="sy3">&</span> y <span class="br0">)</span><span class="sy4">;</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-cxx20">(C++20 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw4">bool</span> OtherConst <span class="sy1">></span><br /></span>
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<p> requires std<span class="sy4">::</span><span class="me2">sized_sentinel_for</span><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">sentinel_t</span><span class="sy1"><</span>Base<span class="sy1">></span>,<br />
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ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span><span class="coMULTI">/*maybe-const*/</span><span class="sy1"><</span>OtherConst, V<span class="sy1">>>></span><br />
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> ranges<span class="sy4">::</span><span class="me2">range_difference_t</span><span class="sy1"><</span><span class="coMULTI">/*maybe-const*/</span><span class="sy1"><</span>OtherConst, V<span class="sy1">>></span><br /></p>
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operator<span class="sy2">-</span><span class="br0">(</span> <span class="kw4">const</span> <span class="coMULTI">/*sentinel*/</span><span class="sy3">&</span> y, <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy1"><</span>OtherConst<span class="sy1">></span><span class="sy3">&</span> x <span class="br0">)</span><span class="sy4">;</span></div>
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</td>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<p>计算 <code>x</code> 的底层迭代器与 <code>y</code> 的底层哨位间的距离。</p>
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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>elements_view::<i>sentinel</i><Const></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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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>x</td>
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<td>-</td>
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<td><a href="cpp-ranges-elements_view-iterator.html">迭代器</a></td>
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</tr>
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<tr class="t-par">
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<td>y</td>
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<td>-</td>
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<td>哨位</td>
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</tr>
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</table>
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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> <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span> y.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span></span></span></div>
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<div class="t-li1"><span class="t-li">2)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">y.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span> x.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span></span></span></div>
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</div>
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</body>
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