202 lines
24 KiB
HTML
202 lines
24 KiB
HTML
<!DOCTYPE html>
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<title>std::to_array</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_container_array_to_array 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::</span>to_array</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-container.html">container</a>‎ | <a href="cpp-container-array.html">array</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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<div>定义于头文件 <code><a href="cpp-header-array.html"><array></a></code></div>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> N<span class="sy1">></span><br />
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<span class="kw4">constexpr</span> <a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1"><</span><a href="cpp-types-remove_cv.html"><span class="kw597">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1"><</span>T<span class="sy1">></span>, N<span class="sy1">></span> to_array<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&</span>a<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> N<span class="sy1">></span><br />
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<span class="kw4">constexpr</span> <a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1"><</span><a href="cpp-types-remove_cv.html"><span class="kw597">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1"><</span>T<span class="sy1">></span>, N<span class="sy1">></span> to_array<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&&</span>a<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<p>从一维内建数组 <code>a</code> 创建 <span class="t-lc"><a href="cpp-container-array.html">std::array</a></span> 。从 <code>a</code> 的对应元素复制初始化 <code>std::array</code> 的元素。不支持复制或移动多维内建数组。</p>
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<div class="t-li1"><span class="t-li">1)</span> 对 <code>0, ..., N - 1</code> 中的每个 <code>i</code> ，以 <span class="t-c"><span class="mw-geshi cpp source-cpp">a<span class="br0">[</span>i<span class="br0">]</span></span></span> 复制初始化结果的对应元素。若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_constructible.html"><span class="kw521">std::<span class="me2">is_constructible_v</span></span></a><span class="sy1"><</span>T, T<span class="sy3">&</span><span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 则此重载为谬构。</div>
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<div class="t-li1"><span class="t-li">2)</span> 对 <code>0, ..., N - 1</code> 中的每个 <code>i</code> ，以 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>a<span class="br0">[</span>i<span class="br0">]</span><span class="br0">)</span></span></span> 复制初始化结果的对应元素。若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_move_constructible.html"><span class="kw539">std::<span class="me2">is_move_constructible_v</span></span></a><span class="sy1"><</span>T<span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 则此重载为谬构。</div>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_array.html"><span class="kw461">std::<span class="me2">is_array_v</span></span></a><span class="sy1"><</span>T<span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 时两个重载均为谬构。</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>a</td>
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<td>-</td>
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<td>要转换成 <span class="t-lc"><a href="cpp-container-array.html">std::array</a></span> 的内建数组</td>
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<tr class="t-par-hitem">
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<td colspan="3">类型要求</td>
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<tr class="t-par-req">
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<td colspan="3">-
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<div class="spacer"></div>
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为使用重载 (1) ， <code>T</code> 必须满足<a href="cpp-named_req-CopyConstructible.html"><span style="font-style:italic">可复制构造</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyConstructible)</span></a> 的要求。</td>
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<tr class="t-par-req">
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<td colspan="3">-
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<div class="spacer"></div>
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为使用重载 (2) ， <code>T</code> 必须满足<a href="cpp-named_req-MoveConstructible.html"><span style="font-style:italic">可移动构造</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(MoveConstructible)</span></a> 的要求。</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> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1"><</span><a href="cpp-types-remove_cv.html"><span class="kw597">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1"><</span>T<span class="sy1">></span>, N<span class="sy1">></span><span class="br0">{</span> a<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span>, ..., a<span class="br0">[</span>N <span class="sy2">-</span> <span class="nu0">1</span><span class="br0">]</span> <span class="br0">}</span></span></span></div>
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<div class="t-li1"><span class="t-li">2)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1"><</span><a href="cpp-types-remove_cv.html"><span class="kw597">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1"><</span>T<span class="sy1">></span>, N<span class="sy1">></span><span class="br0">{</span> std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>a<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span><span class="br0">)</span>, ..., std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>a<span class="br0">[</span>N <span class="sy2">-</span> <span class="nu0">1</span><span class="br0">]</span><span class="br0">)</span> <span class="br0">}</span></span></span></div>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
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<p>有一些不能使用 <span class="t-lc"><a href="cpp-container-array.html">std::array</a></span> 的<a href="cpp-language-class_template_argument_deduction.html">类模板实参推导</a>而 <code>to_array</code> 可用的情况：</p>
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<ul>
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<li><code>to_array</code> 能在手工指定 <code>std::array</code> 的元素类型并推导长度时指定，这在想要隐式转换时会更好。</li>
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<li><code>to_array</code> 能复制字符串字面量，而类模板实参推导构造单个指向其首字符的 <code>std::array</code> 。</li>
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</ul>
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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">std<span class="sy4">::</span><span class="me2">to_array</span><span class="sy1"><</span><span class="kw4">long</span><span class="sy1">></span><span class="br0">(</span><span class="br0">{</span><span class="nu0">3</span>, <span class="nu0">4</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// OK ：隐式转换</span>
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<span class="co1">// std::array<long>{3, 4}; // 错误：模板参数太少</span>
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std<span class="sy4">::</span><span class="me2">to_array</span><span class="br0">(</span><span class="st0">"foo"</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 创建 std::array<char, 4>{ 'f', 'o', 'o', '\0' }</span>
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<a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="br0">{</span><span class="st0">"foo"</span><span class="br0">}</span><span class="sy4">;</span> <span class="co1">// 创建 std::array<const char*, 1>{ +"foo" }</span></pre></div>
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<h3><span class="mw-headline" id=".E5.8F.AF.E8.83.BD.E7.9A.84.E5.AE.9E.E7.8E.B0">可能的实现</span></h3>
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<table class="eq-fun-cpp-table">
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<tr>
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<th>版本一</th>
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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="kw1">namespace</span> detail <span class="br0">{</span>
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<span class="kw1">template</span> <span class="sy1"><</span><span class="kw1">class</span> T, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> N, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a>... <span class="me1">I</span><span class="sy1">></span>
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<span class="kw4">constexpr</span> <a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1"><</span><a href="cpp-types-remove_cv.html"><span class="kw597">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1"><</span>T<span class="sy1">></span>, N<span class="sy1">></span>
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to_array_impl<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&</span>a<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span>, <a href="cpp-utility-integer_sequence.html"><span class="kw1108">std::<span class="me2">index_sequence</span></span></a><span class="sy1"><</span>I...<span class="sy1">></span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw1">return</span> <span class="br0">{</span> <span class="br0">{</span>a<span class="br0">[</span>I<span class="br0">]</span>...<span class="br0">}</span> <span class="br0">}</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span>
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<span class="kw1">template</span> <span class="sy1"><</span><span class="kw1">class</span> T, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> N<span class="sy1">></span>
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<span class="kw4">constexpr</span> <a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1"><</span><a href="cpp-types-remove_cv.html"><span class="kw597">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1"><</span>T<span class="sy1">></span>, N<span class="sy1">></span> to_array<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&</span>a<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw1">return</span> detail<span class="sy4">::</span><span class="me2">to_array_impl</span><span class="br0">(</span>a, <a href="cpp-utility-integer_sequence.html"><span class="kw1110">std::<span class="me2">make_index_sequence</span></span></a><span class="sy1"><</span>N<span class="sy1">></span><span class="br0">{</span><span class="br0">}</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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</td>
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</tr>
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<tr>
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<th>版本二</th>
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</tr>
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<tr>
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<td>
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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="kw1">namespace</span> detail <span class="br0">{</span>
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<span class="kw1">template</span> <span class="sy1"><</span><span class="kw1">class</span> T, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> N, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a>... <span class="me1">I</span><span class="sy1">></span>
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<span class="kw4">constexpr</span> <a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1"><</span><a href="cpp-types-remove_cv.html"><span class="kw597">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1"><</span>T<span class="sy1">></span>, N<span class="sy1">></span>
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to_array_impl<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&&</span>a<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span>, <a href="cpp-utility-integer_sequence.html"><span class="kw1108">std::<span class="me2">index_sequence</span></span></a><span class="sy1"><</span>I...<span class="sy1">></span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw1">return</span> <span class="br0">{</span> <span class="br0">{</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>a<span class="br0">[</span>I<span class="br0">]</span><span class="br0">)</span>...<span class="br0">}</span> <span class="br0">}</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span>
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<span class="kw1">template</span> <span class="sy1"><</span><span class="kw1">class</span> T, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> N<span class="sy1">></span>
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<span class="kw4">constexpr</span> <a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1"><</span><a href="cpp-types-remove_cv.html"><span class="kw597">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1"><</span>T<span class="sy1">></span>, N<span class="sy1">></span> to_array<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&&</span>a<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw1">return</span> detail<span class="sy4">::</span><span class="me2">to_array_impl</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>a<span class="br0">)</span>, <a href="cpp-utility-integer_sequence.html"><span class="kw1110">std::<span class="me2">make_index_sequence</span></span></a><span class="sy1"><</span>N<span class="sy1">></span><span class="br0">{</span><span class="br0">}</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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</table>
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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="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <type_traits></span>
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<span class="co2">#include <utility></span>
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<span class="co2">#include <array></span>
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<span class="co2">#include <memory></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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<span class="co1">// 复制字符串字面量</span>
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<span class="kw4">auto</span> a1 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_array</span><span class="br0">(</span><span class="st0">"foo"</span><span class="br0">)</span><span class="sy4">;</span>
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static_assert<span class="br0">(</span>a1.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">4</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="co1">// 推导元素类型和长度</span>
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<span class="kw4">auto</span> a2 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_array</span><span class="br0">(</span><span class="br0">{</span> <span class="nu0">0</span>, <span class="nu0">2</span>, <span class="nu0">1</span>, <span class="nu0">3</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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static_assert<span class="br0">(</span><a href="cpp-types-is_same.html"><span class="kw589">std::<span class="me2">is_same_v</span></span></a><span class="sy1"><</span>decltype<span class="br0">(</span>a2<span class="br0">)</span>, <a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1"><</span><span class="kw4">int</span>, <span class="nu0">4</span><span class="sy1">>></span><span class="br0">)</span><span class="sy4">;</span>
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<span class="co1">// 推导长度而元素类型指定</span>
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<span class="co1">// 发生隐式转换</span>
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<span class="kw4">auto</span> a3 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_array</span><span class="sy1"><</span><span class="kw4">long</span><span class="sy1">></span><span class="br0">(</span><span class="br0">{</span> <span class="nu0">0</span>, <span class="nu0">1</span>, <span class="nu0">3</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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static_assert<span class="br0">(</span><a href="cpp-types-is_same.html"><span class="kw589">std::<span class="me2">is_same_v</span></span></a><span class="sy1"><</span>decltype<span class="br0">(</span>a3<span class="br0">)</span>, <a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1"><</span><span class="kw4">long</span>, <span class="nu0">3</span><span class="sy1">>></span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">auto</span> a4 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_array</span><span class="sy1"><</span><a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1"><</span><span class="kw4">int</span>, <span class="kw4">float</span><span class="sy1">>></span><span class="br0">(</span>
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<span class="br0">{</span> <span class="br0">{</span> <span class="nu0">3</span>, <span class="nu17">.0f</span> <span class="br0">}</span>, <span class="br0">{</span> <span class="nu0">4</span>, <span class="nu17">.1f</span> <span class="br0">}</span>, <span class="br0">{</span> <span class="nu0">4</span>, .1e23f <span class="br0">}</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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static_assert<span class="br0">(</span>a4.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">3</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="co1">// 创建不可复制的 std::array</span>
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<span class="kw4">auto</span> a5 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_array</span><span class="br0">(</span><span class="br0">{</span> <a href="cpp-memory-unique_ptr-make_unique.html"><span class="kw735">std::<span class="me2">make_unique</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span><span class="br0">(</span><span class="nu0">3</span><span class="br0">)</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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static_assert<span class="br0">(</span>a5.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="co1">// 错误：不支持复制多维数组</span>
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<span class="co1">// char s[2][6] = { "nice", "thing" };</span>
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<span class="co1">// auto a6 = std::to_array(s);</span>
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<span class="br0">}</span></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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<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-experimental-make_array.html"><span class="t-lines"><span>make_array</span></span></a></div>
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</div>
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</td>
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<td>创建 <span class="t-lc"><a href="cpp-container-array.html">std::array</a></span> 对象，从参数推导出其大小和可选的元素类型<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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