100 lines
9.6 KiB
HTML
100 lines
9.6 KiB
HTML
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<title>operator==,<,>,<=,>=,<=>(ranges::transform_view::iterator)</title>
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<h1 id="firstHeading" class="firstHeading">operator==,<,>,<=,>=,<=><span style="font-size:0.7em; line-height:130%">(ranges::transform_view::<i>iterator</i>)</span></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-transform_view.html">transform view</a>‎ | <a href="cpp-ranges-transform_view-iterator.html">iterator</a></span></div>
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<table class="t-dcl-begin">
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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, <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&</span> y <span class="br0">)</span><br />
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requires std<span class="sy4">::</span><span class="me2">equality_comparable</span><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span>Base<span class="sy1">>></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-cxx20">(C++20 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> <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, <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&</span> y <span class="br0">)</span><br />
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requires ranges<span class="sy4">::</span><span class="me2">random_access_range</span><span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span></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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<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, <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&</span> y <span class="br0">)</span><br />
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requires ranges<span class="sy4">::</span><span class="me2">random_access_range</span><span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<tr class="t-dcl t-since-cxx20">
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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, <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&</span> y <span class="br0">)</span><br />
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requires ranges<span class="sy4">::</span><span class="me2">random_access_range</span><span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span></span></div>
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</td>
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<td>(4)</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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<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, <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&</span> y <span class="br0">)</span><br />
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requires ranges<span class="sy4">::</span><span class="me2">random_access_range</span><span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span></span></div>
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</td>
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<td>(5)</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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">auto</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, <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&</span> y <span class="br0">)</span><br /></span>
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<p> requires ranges<span class="sy4">::</span><span class="me2">random_access_range</span><span class="sy1"><</span>Base<span class="sy1">></span> <span class="sy3">&&</span><br /></p>
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std<span class="sy4">::</span><span class="me2">three_way_comparable</span><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span></div>
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</td>
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<td>(6)</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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<td></td>
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<td></td>
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<td></td>
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</tbody>
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<p>比较底层迭代器。</p>
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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">current_</span> <span class="sy1">==</span> y.<span class="me1">current_</span><span class="sy4">;</span></span></span> ，其中 <code>current_</code> 是底层迭代器。</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> x.<span class="me1">current_</span> <span class="sy1"><</span> y.<span class="me1">current_</span><span class="sy4">;</span></span></span> ，其中 <code>current_</code> 是底层迭代器。</div>
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<div class="t-li1"><span class="t-li">3)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> y <span class="sy1"><</span> x<span class="sy4">;</span></span></span></div>
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<div class="t-li1"><span class="t-li">4)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> <span class="sy3">!</span><span class="br0">(</span>y <span class="sy1"><</span> x<span class="br0">)</span><span class="sy4">;</span></span></span></div>
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<div class="t-li1"><span class="t-li">5)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> <span class="sy3">!</span><span class="br0">(</span>x <span class="sy1"><</span> y<span class="br0">)</span><span class="sy4">;</span></span></span></div>
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<div class="t-li1"><span class="t-li">6)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> x.<span class="me1">current_</span> <span class="sy1"><=></span> y.<span class="me1">current_</span><span class="sy4">;</span></span></span> ，其中 <code>current_</code> 是底层迭代器。</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::ranges::transform_view::<i>iterator</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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<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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<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, y</td>
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<td>-</td>
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<td>要比较的迭代器</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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<p>比较结果</p>
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</div>
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<div class="visualClear"></div>
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