59 lines
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59 lines
5.0 KiB
HTML
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::ranges::</span>projected</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-ranges.html">ranges</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-experimental-ranges-iterator.html"><experimental/ranges/iterator></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span><a href="cpp-experimental-ranges-iterator-Readable.html"><span class="kw2562">ranges::<span class="me2">Readable</span></span></a> I, <a href="cpp-experimental-ranges-iterator-IndirectUnaryInvocable.html"><span class="kw2575">ranges::<span class="me2">IndirectRegularUnaryInvocable</span></span></a><span class="sy1"><</span>I<span class="sy1">></span> Proj<span class="sy1">></span><br /></span>
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<p><span class="kw1">struct</span> projected <span class="br0">{</span><br />
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<span class="kw1">using</span> value_type <span class="sy1">=</span><br />
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<a href="cpp-types-remove_cv.html"><span class="kw597">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1"><</span><br />
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<a href="cpp-types-remove_reference.html"><span class="kw607">std::<span class="me2">remove_reference_t</span></span></a><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">indirect_result_of_t</span><span class="sy1"><</span>Proj<span class="sy3">&</span><span class="br0">(</span>I<span class="br0">)</span><span class="sy1">>></span><br />
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<span class="sy1">></span><span class="sy4">;</span><br />
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ranges<span class="sy4">::</span><span class="me2">indirect_result_of_t</span><span class="sy1"><</span>Proj<span class="sy3">&</span><span class="br0">(</span>I<span class="br0">)</span><span class="sy1">></span> operator<span class="sy2">*</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span><br />
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<span class="br0">}</span><span class="sy4">;</span><br />
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<span class="kw1">template</span> <span class="sy1"><</span><a href="cpp-experimental-ranges-iterator-WeaklyIncrementable.html"><span class="kw2564">ranges::<span class="me2">WeaklyIncrementable</span></span></a> I, <span class="kw1">class</span> Proj<span class="sy1">></span><br />
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<span class="kw1">struct</span> difference_type<span class="sy1"><</span>projected<span class="sy1"><</span>I, Proj<span class="sy1">>></span> <span class="br0">{</span><br />
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<span class="kw1">using</span> type <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">difference_type_t</span><span class="sy1"><</span>I<span class="sy1">></span><span class="sy4">;</span><br /></p>
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<span class="br0">}</span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-ranges-ts t-mark-ts">(范围 TS)</span></td>
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<p>类模板 <code>projected</code> 把 <a href="cpp-experimental-ranges-iterator-Readable.html"><code>Readable</code></a>类型 <code>I</code> 和函数 <code>Proj</code> 打包成新的可读 (<code>Readable</code>) 类型，其 <code>reference</code> 为应用 <code>Proj</code> 到 <code>I</code> 的 <code>reference</code> 类型的结果。它单独为简化制约规定而存在，故而其 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy2">*</span><span class="br0">(</span><span class="br0">)</span></span></span> 可以不实际定义。</p>
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