129 lines
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129 lines
10 KiB
HTML
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<title>std::ranges::iota_view<W, Bound>::sentinel</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ranges::</span><span style="font-size:0.7em; line-height:130%">iota_view<W, Bound>::</span><i>sentinel</i></h1>
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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-iota_view.html">iota view</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">struct</span> <span class="coMULTI">/*sentinel*/</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p><a href="cpp-ranges-iota_view.html"><tt>iota_view::end</tt></a> 的返回类型，在 <code>iota_view</code> 有界（即 <code>Bound</code> 不是 <span class="t-lc">std::unreachable_sentinel_t</span> ）且 <code>Bound</code> 与 <code>W</code> 不是同一类型时使用。</p>
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<p>此类的名字（此处示作 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*sentinel*/</span></span></span>）是未指定的。</p>
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<p>典型实现保有一个 <code>Bound</code> 类型的数据成员（此处示作 <span class="t-c"><span class="mw-geshi cpp source-cpp">bound_</span></span>），对于有界 <code>iota_view</code> 常为数。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<h2><span class="mw-headline" id="std::ranges::iota_view::sentinel::sentinel"><span style="font-size:0.7em; line-height:130%">std::ranges::iota_view::<i>sentinel</i>::</span><i>sentinel</i></span></h2>
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<div><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*sentinel*/</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span></span></div>
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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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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw1">explicit</span> <span class="coMULTI">/*sentinel*/</span><span class="br0">(</span> Bound bound <span class="br0">)</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-cxx20">(C++20 起)</span></td>
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<div class="t-li1"><span class="t-li">1)</span> 通过其默认成员初始化器（ <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy1">=</span> Bound<span class="br0">(</span><span class="br0">)</span></span></span> ）值初始化 <span class="t-c"><span class="mw-geshi cpp source-cpp">bound_</span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 以 <span class="t-c"><span class="mw-geshi cpp source-cpp">bound</span></span> 初始化仅用于阐释的数据成员 <span class="t-c"><span class="mw-geshi cpp source-cpp">bound_</span></span> 。</div>
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<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">非成员函数</span></h3>
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<p>在下列描述中， <code><i>value_</i></code> 是 <a href="cpp-ranges-iota_view-iterator.html"><code><i>iterator</i></code></a> 的仅用于阐释的数据成员，其 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy2">*</span></span></span> 从该成员复制。</p>
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<h2><span class="mw-headline" id="operator.3D.3D.28std::ranges::iota_view::iterator.2C_std::ranges::iota_view::sentinel.29">operator==<small>(std::ranges::iota_view::<i>iterator</i>, std::ranges::iota_view::<i>sentinel</i>)</small></span></h2>
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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> <span class="coMULTI">/*iterator*/</span><span class="sy3">&</span> x,<br />
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<span class="kw4">const</span> <span class="coMULTI">/*sentinel*/</span><span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> x.<span class="me1">value_</span> <span class="sy1">==</span> y.<span class="me1">bound_</span><span class="sy4">;</span></span></span> 。</p>
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<p><code>!=</code> 运算符从 <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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<p>此函数对通常<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><i>sentinel</i></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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<h2><span class="mw-headline" id="operator-.28std::ranges::iota_view::iterator.2C_std::ranges::iota_view::sentinel.29">operator-<small>(std::ranges::iota_view::<i>iterator</i>, std::ranges::iota_view::<i>sentinel</i>)</small></span></h2>
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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">iter_difference_t</span><span class="sy1"><</span>W<span class="sy1">></span><br /></span>
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<p> operator<span class="sy2">-</span><span class="br0">(</span><span class="kw4">const</span> <span class="coMULTI">/*iterator*/</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><br /></p>
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requires std<span class="sy4">::</span><span class="me2">sized_sentinel_for</span><span class="sy1"><</span>Bound, W<span class="sy1">></span><span class="sy4">;</span></div>
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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">iter_difference_t</span><span class="sy1"><</span>W<span class="sy1">></span><br /></span>
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<p> operator<span class="sy2">-</span><span class="br0">(</span><span class="kw4">const</span> <span class="coMULTI">/*sentinel*/</span><span class="sy3">&</span> x, <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&</span> y<span class="br0">)</span><br /></p>
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requires std<span class="sy4">::</span><span class="me2">sized_sentinel_for</span><span class="sy1"><</span>Bound, W<span class="sy1">></span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div class="t-li1"><span class="t-li">1)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> x.<span class="me1">value_</span> <span class="sy2">-</span> y.<span class="me1">bound_</span><span class="sy4">;</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> <span class="sy2">-</span><span class="br0">(</span>y.<span class="me1">value_</span> <span class="sy2">-</span> x.<span class="me1">bound_</span><span class="br0">)</span><span class="sy4">;</span></span></span> 。</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><i>sentinel</i></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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