117 lines
5.8 KiB
HTML
117 lines
5.8 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>std::char_traits<CharT>::assign</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_string_char_traits_assign 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::char_traits<CharT>::</span>assign</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-char_traits.html">char traits</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></tbody>
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<tbody class="t-dcl-rev t-dcl-rev-num">
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<td></td>
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<td rowspan="142">(1)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">static</span> <span class="kw4">void</span> assign<span class="br0">(</span> char_type<span class="sy3">&</span> r, <span class="kw4">const</span> char_type<span class="sy3">&</span> a <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td>
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<tr class="t-dcl t-since-cxx11 t-until-cxx17">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">static</span> <span class="kw4">void</span> assign<span class="br0">(</span> char_type<span class="sy3">&</span> r, <span class="kw4">const</span> char_type<span class="sy3">&</span> a <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span><br />
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<span class="t-mark-rev t-until-cxx17">(C++17 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">void</span> assign<span class="br0">(</span> char_type<span class="sy3">&</span> r, <span class="kw4">const</span> char_type<span class="sy3">&</span> a <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<td rowspan="142">(2)</td>
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<tr class="t-dcl t-until-cxx20">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">static</span> char_type<span class="sy2">*</span> assign<span class="br0">(</span> char_type<span class="sy2">*</span> p, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> count, char_type a <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><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">static</span> <span class="kw4">constexpr</span> char_type<span class="sy2">*</span> assign<span class="br0">(</span> char_type<span class="sy2">*</span> p,<br />
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<a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> count, char_type a <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><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>赋值一个字符。</p>
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<div class="t-li1"><span class="t-li">1)</span> 赋值字符 <code>a</code> 给字符 <code>r</code> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 赋值字符 <code>a</code> 给 <code>p</code> 所指的字符序列中的 <code>count</code> 个字符的每一个。</div>
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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>a</td>
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<td>-</td>
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<td>要赋值的字符值</td>
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</tr>
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<tr class="t-par">
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<td>r</td>
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<td>-</td>
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<td>被赋值的字符</td>
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<tr class="t-par">
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<td>p</td>
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<td>-</td>
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<td>指向被赋值字符序列的指针</td>
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</tr>
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<tr class="t-par">
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<td>count</td>
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<td>-</td>
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<td>字符序列的长度</td>
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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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<div class="t-li1"><span class="t-li">1)</span> （无）</div>
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<div class="t-li1"><span class="t-li">2)</span> <code>p</code></div>
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<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">复杂度</span></h3>
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<div class="t-li1"><span class="t-li">1)</span> 常数。</div>
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<div class="t-li1"><span class="t-li">2)</span> 与 <code>count</code> 成线性</div>
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</div>
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