121 lines
6.3 KiB
HTML
121 lines
6.3 KiB
HTML
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<title>char32_t</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_string_multibyte_char32_t skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading">char32_t</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="c.html">c</a>‎ | <a href="c-string.html">string</a>‎ | <a href="c-string-multibyte.html">multibyte</a></span></div>
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<div>定义于头文件 <code><uchar.h></code></div>
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<div><span class="mw-geshi c source-c"><span class="kw1">typedef</span> <a href="c-types-integer.html"><span class="kw130">uint_least32_t</span></a> char32_t<span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-c11">(C11 起)</span></td>
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<div>定义于头文件 <code><stdint.h></code></div>
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<div><span class="mw-geshi c source-c"><span class="kw1">typedef</span> <span class="coMULTI">/*implementation-defined*/</span> <a href="c-types-integer.html"><span class="kw130">uint_least32_t</span></a><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-c99">(C99 起)</span></td>
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<p><span class="t-c"><span class="mw-geshi c source-c">char32_t</span></span> 是用于 32 位宽字符的无符号整数类型，与 <span class="t-c"><span class="mw-geshi c source-c"><a href="c-types-integer.html"><span class="kw130">uint_least32_t</span></a></span></span> 为同一类型。</p>
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<p><span class="t-c"><span class="mw-geshi c source-c"><a href="c-types-integer.html"><span class="kw130">uint_least32_t</span></a></span></span> 是至少拥有 32 位的最小无符号整数类型。</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>任何给定平台上，类型 <span class="t-c"><span class="mw-geshi c source-c">char32_t</span></span> 的宽度可能大于 32 位，但存储于 <span class="t-c"><span class="mw-geshi c source-c">char32_t</span></span> 类型对象中的实际值将始终拥有 32 位宽度。</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="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="c source-c">
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<pre class="de1"><span class="co2">#include <uchar.h></span>
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<span class="co2">#include <stdio.h></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
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<span class="br0">{</span>
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char32_t wc<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> U<span class="st0">"zß水🍌"</span><span class="sy4">;</span> <span class="co1">// 或 "z\u00df\u6c34\U0001f34c"</span>
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<a href="c-types-size_t.html"><span class="kw100">size_t</span></a> wc_sz <span class="sy1">=</span> <span class="kw4">sizeof</span> wc <span class="sy2">/</span> <span class="kw4">sizeof</span> <span class="sy2">*</span>wc<span class="sy4">;</span>
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<a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"%zu UTF-32 code units: [ "</span>, wc_sz<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><a href="c-types-size_t.html"><span class="kw100">size_t</span></a> n <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> n <span class="sy1"><</span> wc_sz<span class="sy4">;</span> <span class="sy2">++</span>n<span class="br0">)</span> <a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"%#x "</span>, wc<span class="br0">[</span>n<span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"]<span class="es1">\n</span>"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>可能的输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">5 UTF-32 code units: [ 0x7a 0xdf 0x6c34 0x1f34c 0 ]</pre></div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">引用</span></h3>
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<div class="t-ref-std-11">
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<ul>
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<li>C11 标准（ISO/IEC 9899:2011）：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>7.28 Unicode utilities <uchar.h> (p: 398)</li>
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</ul>
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</dd>
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</dl>
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<dl>
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<dd>
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<ul>
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<li>7.20.1.2 Minimum-width integer types (p: 290)</li>
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</ul>
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</dd>
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</dl>
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<div class="t-ref-std-c99">
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<ul>
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<li>C99 标准（ISO/IEC 9899:1999）：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>7.18.1.2 Minimum-width integer types (p: 256)</li>
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</ul>
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</dd>
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</dl>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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