87 lines
6.6 KiB
HTML
87 lines
6.6 KiB
HTML
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<title>std::experimental::reflect::ObjectSequence</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_reflect_ObjectSequence skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::reflect::</span>ObjectSequence</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-reflect.html">reflect</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-experimental-reflect.html"><experimental/reflect></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> T <span class="sy1">></span><br />
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concept <span class="kw4">bool</span> ObjectSequence <span class="sy1">=</span> Object<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span> <span class="coMULTI">/* see below */</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-reflection-ts t-mark-ts">(反射 TS)</span></td>
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<p><code>ObjectSequence</code> 概念为元对象序列类型所满足。</p>
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<p>元对象序列类型是从生成序列的元对象操作，如 <a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/experimental/reflect/get_data_members&action=edit&redlink=1" class="new" title="cpp/experimental/reflect/get data members（页面不存在）"><code>get_data_members</code></a> 获得的元对象类型。元对象序列类型中的每个元素均为元对象类型。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include<type_traits></span>
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<span class="co2">#include<tuple></span>
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<span class="co2">#include<cmath></span>
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<span class="co2">#include<experimental/reflect></span>
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<span class="kw1">using</span> reflect <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">experimental</span><span class="sy4">::</span><span class="me2">reflect</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span>reflect<span class="sy4">::</span><span class="me2">Typed</span>... <span class="me1">Ms</span><span class="sy1">></span>
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<span class="kw1">using</span> tuple_from_seq_t <span class="sy1">=</span> <a href="cpp-utility-tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1"><</span>reflect<span class="sy4">::</span><span class="me2">get_reflected_type_t</span><span class="sy1"><</span>
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reflect<span class="sy4">::</span><span class="me2">get_type_t</span><span class="sy1"><</span>Ms<span class="sy1">>></span>...<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span>reflect<span class="sy4">::</span><span class="me2">Record</span> T<span class="sy1">></span>
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<span class="kw1">using</span> collect_tuple <span class="sy1">=</span> reflect<span class="sy4">::</span><span class="me2">unpack_sequence_t</span><span class="sy1"><</span>
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tuple_from_seq_t,
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reflect<span class="sy4">::</span><span class="me2">get_data_members</span><span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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static_assert<span class="br0">(</span>reflect<span class="sy4">::</span><span class="me2">ObjectSequence</span><span class="sy1"><</span>
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reflect<span class="sy4">::</span><span class="me2">get_data_members</span><span class="sy1"><</span>reflexpr<span class="br0">(</span><a href="cpp-numeric-math-div.html"><span class="kw1307">std::<span class="me2">div_t</span></span></a><span class="br0">)</span><span class="sy1">>></span>, <span class="st0">""</span><span class="br0">)</span><span class="sy4">;</span>
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static_assert<span class="br0">(</span><a href="cpp-types-is_same.html"><span class="kw588">std::<span class="me2">is_same</span></span></a><span class="sy1"><</span>collect_tuple<span class="sy1"><</span>reflexpr<span class="br0">(</span><a href="cpp-numeric-math-div.html"><span class="kw1307">std::<span class="me2">div_t</span></span></a><span class="br0">)</span><span class="sy1">></span>,
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<a href="cpp-utility-tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1"><</span><span class="kw4">int</span>, <span class="kw4">int</span><span class="sy1">>></span><span class="sy4">::</span><span class="me2">value</span>, <span class="st0">""</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<td class="mbox-text" style="">本节未完成<br />
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原因：模板化</td>
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