73 lines
4.2 KiB
HTML
73 lines
4.2 KiB
HTML
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<title>std::signed_integral</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_concepts_signed_integral 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::</span>signed_integral</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-concepts.html">concepts</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-concepts.html"><concepts></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 signed_integral <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">integral</span><span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span> <a href="cpp-types-is_signed.html"><span class="kw517">std::<span class="me2">is_signed_v</span></span></a><span class="sy1"><</span>T<span class="sy1">></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>概念 <code>signed_integral<T></code> 若且唯若 <code>T</code> 为整数类型且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_signed.html"><span class="kw517">std::<span class="me2">is_signed_v</span></span></a><span class="sy1"><</span>T<span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 才得到满足。.</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p><code>signed_integral<T></code> 可以为不是<a href="cpp-language-type.html#.E7.B1.BB.E5.9E.8B.E7.9A.84.E5.88.86.E7.B1.BB">有符号整数类型</a>，如 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> 的类型所满足（在 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> 为有符号的系统上）。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-types-is_integral.html"><span class="t-lines"><span>is_integral</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</td>
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<td>检查类型是否为整型<br />
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<span class="t-mark">(类模板)</span></td>
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<tr class="t-dsc">
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<div><a href="cpp-types-is_signed.html"><span class="t-lines"><span>is_signed</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>检查类型是否为有符号算术类型<br />
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<span class="t-mark">(类模板)</span></td>
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