76 lines
4.0 KiB
HTML
76 lines
4.0 KiB
HTML
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<title>std::char_traits<CharT>::copy</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_string_char_traits_copy 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::char_traits<CharT>::</span>copy</h1>
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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><span class="mw-geshi cpp source-cpp"><span class="kw4">static</span> char_type<span class="sy2">*</span> copy<span class="br0">(</span> char_type<span class="sy2">*</span> dest, <span class="kw4">const</span> char_type<span class="sy2">*</span> src, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> count <span class="br0">)</span><span class="sy4">;</span></span></div>
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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> copy<span class="br0">(</span> char_type<span class="sy2">*</span> dest, <span class="kw4">const</span> char_type<span class="sy2">*</span> src, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> count <span class="br0">)</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>从 <code>src</code> 所指的字符串复制 <code>count</code> 个字符到 <code>dest</code> 所指向的字符序列。</p>
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<p>正式而言，对 <code>[0, count)</code> 中每个 <code>i</code> 进行 <span class="t-lc">assign(src[i], dest[i])</span> 。</p>
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<p>若复制的字符范围重叠，即 <code>src</code> 在 [<code>dest</code>, <code>dest + count</code>) 之中，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>dest</td>
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<td>-</td>
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<td>指向要复制的字符串的指针</td>
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</tr>
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<tr class="t-par">
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<td>src</td>
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<td>-</td>
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<td>指向复制来源的字符串的指针</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>要复制的字符数</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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<p><code>dest</code></p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>不抛出。</p>
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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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<p>线性。</p>
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