86 lines
4.6 KiB
HTML
86 lines
4.6 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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<title>std::basic_ios<CharT,Traits>::narrow</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_ios_narrow skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_ios<CharT,Traits>::</span>narrow</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-io.html">io</a>‎ | <a href="cpp-io-basic_ios.html">basic ios</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span> narrow<span class="br0">(</span> char_type c, <span class="kw4">char</span> dfault <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<p>转换当前本地环境限定的字符 <code>c</code> 到其标准等价物。若需要则将结果从 <code>char_type</code> 转换到 <code>char</code> 。若不能进行转换，则函数返回 <code>dfault</code> 。</p>
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<p>等效地调用 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-locale-use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1"><</span> <a href="cpp-locale-ctype.html"><span class="kw1938">std::<span class="me2">ctype</span></span></a><span class="sy1"><</span>char_type<span class="sy1">></span> <span class="sy1">></span><span class="br0">(</span>getloc<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">narrow</span><span class="br0">(</span>c, dfault<span class="br0">)</span><span class="sy4">;</span></span></span> 。</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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<td>c</td>
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<td>-</td>
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<td>要转换的字符</td>
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</tr>
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<tr class="t-par">
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<td>dfault</td>
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<td>-</td>
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<td>若转化不成功则返回的字符</td>
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</tr>
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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>转换到标准等价物再到 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> 的字符。若转换失败则返回 <code>dfault</code> 。</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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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-basic_ios-widen.html"><span class="t-lines"><span>widen</span></span></a></div>
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</div>
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</td>
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<td>拓宽字符<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-ctype-narrow.html"><span class="t-lines"><span>narrow</span></span></a></div>
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</div>
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</td>
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<td>调用 <code>do_narrow</code><br />
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<span class="t-mark">(<code>std::ctype<CharT></code> 的公开成员函数)</span></td>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-multibyte-wctob.html"><span class="t-lines"><span>wctob</span></span></a></div>
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</div>
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</td>
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<td>若可能，则窄化宽字符为单字节窄字符<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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