108 lines
7.1 KiB
HTML
108 lines
7.1 KiB
HTML
<!DOCTYPE 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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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::towctrans</title>
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<link rel="stylesheet" href="ext.css" />
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_string_wide_towctrans 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"><span style="font-size:0.7em; line-height:130%">std::</span>towctrans</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-string.html">string</a>‎ | <a href="cpp-string-wide.html">wide</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tbody>
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<td>
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<div>定义于头文件 <code><a href="cpp-header-cwctype.html"><cwctype></a></code></div>
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</td>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">wint_t</span> towctrans<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">wint_t</span> wc, std<span class="sy4">::</span><span class="me2">wctrans_t</span> desc <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td class="t-dcl-nopad"></td>
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<td></td>
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<td></td>
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</tbody>
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<p>用 <code>desc</code> 所标识的当前 C 本地环境的 LC_TYPE 映射宽字符 <code>wc</code> 。</p>
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<p>若 <code>ch</code> 的值既不能表示为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">wchar_t</span></span></span> 又不等于宏 <span class="t-c"><span class="mw-geshi cpp source-cpp">WEOF</span></span> ，则行为未定义。</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>ch</td>
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<td>-</td>
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<td>要映射的宽字符</td>
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</tr>
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<tr class="t-par">
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<td>desc</td>
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<td>-</td>
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<td>从调用 <span class="t-lc"><a href="cpp-string-wide-wctrans.html">std::wctrans</a></span> 获得的 LC_CTYPE 映射</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><code>ch</code> 的被映射值，使用当前 C 本地环境的 LC_TYPE 中的 <code>desc</code> 标识的映射。</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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<p>下列代码演示片假名到平假名的字符映射</p>
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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="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <clocale></span>
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<span class="co2">#include <cwctype></span>
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<span class="co2">#include <iostream></span>
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<span class="co2">#include <algorithm></span>
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<a href="cpp-string-basic_string.html"><span class="kw1231">std::<span class="me2">wstring</span></span></a> tohira<span class="br0">(</span><a href="cpp-string-basic_string.html"><span class="kw1231">std::<span class="me2">wstring</span></span></a> str<span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-algorithm-transform.html"><span class="kw1588">std::<span class="me2">transform</span></span></a><span class="br0">(</span>str.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, str.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, str.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, <span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">wchar_t</span> c<span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">return</span> std<span class="sy4">::</span><span class="me2">towctrans</span><span class="br0">(</span>c, <a href="cpp-string-wide-wctrans.html"><span class="kw1196">std::<span class="me2">wctrans</span></span></a><span class="br0">(</span><span class="st0">"tojhira"</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">return</span> str<span class="sy4">;</span>
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<span class="br0">}</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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<a href="cpp-locale-setlocale.html"><span class="kw1989">std::<span class="me2">setlocale</span></span></a><span class="br0">(</span><a href="cpp-locale-LC_categories.html"><span class="kw1992">LC_ALL</span></a>, <span class="st0">"ja_JP.UTF-8"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-string-basic_string.html"><span class="kw1231">std::<span class="me2">wstring</span></span></a> kana <span class="sy1">=</span> L<span class="st0">"ヒラガナ"</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">wcout</span></span></a> <span class="sy1"><<</span> <span class="st0">"katakana characters "</span> <span class="sy1"><<</span> kana
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<span class="sy1"><<</span> <span class="st0">" are "</span> <span class="sy1"><<</span> tohira<span class="br0">(</span>kana<span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">" in hiragana<span class="es1">\n</span>"</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>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">katakana characters ヒラガナ are ひらがな in hiragana</pre></div>
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</div>
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</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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<table class="t-dsc-begin">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-wide-wctrans.html"><span class="t-lines"><span>wctrans</span></span></a></div>
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</div>
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</td>
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<td>在当前 C 本地环境中查找字符映射类别<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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</table>
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<div class="visualClear"></div>
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