176 lines
9.5 KiB
HTML
176 lines
9.5 KiB
HTML
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<title>std::valarray<T>::valarray</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_numeric_valarray_valarray 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::valarray<T>::</span>valarray</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-numeric.html">numeric</a>‎ | <a href="cpp-numeric-valarray.html">valarray</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">valarray<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> valarray<span class="br0">(</span> <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>(2)</td>
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<div><span class="mw-geshi cpp source-cpp">valarray<span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&</span> val, <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>(3)</td>
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<div><span class="mw-geshi cpp source-cpp">valarray<span class="br0">(</span> <span class="kw4">const</span> T<span class="sy2">*</span> vals, <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>(4)</td>
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<div><span class="mw-geshi cpp source-cpp">valarray<span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy3">&</span> other <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(5)</td>
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<div><span class="mw-geshi cpp source-cpp">valarray<span class="br0">(</span> valarray<span class="sy3">&&</span> other <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(6)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">valarray<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-numeric-valarray-slice_array.html"><span class="kw1476">std::<span class="me2">slice_array</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&</span> sa <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(7)</td>
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<div><span class="mw-geshi cpp source-cpp">valarray<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-numeric-valarray-gslice_array.html"><span class="kw1477">std::<span class="me2">gslice_array</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&</span> gsa <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(8)</td>
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<div><span class="mw-geshi cpp source-cpp">valarray<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-numeric-valarray-mask_array.html"><span class="kw1478">std::<span class="me2">mask_array</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&</span> ma <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(9)</td>
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<div><span class="mw-geshi cpp source-cpp">valarray<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-numeric-valarray-indirect_array.html"><span class="kw1479">std::<span class="me2">indirect_array</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&</span> ia <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(10)</td>
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<div><span class="mw-geshi cpp source-cpp">valarray<span class="br0">(</span> <a href="cpp-utility-initializer_list.html"><span class="kw960">std::<span class="me2">initializer_list</span></span></a><span class="sy1"><</span>T<span class="sy1">></span> il <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(11)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<td></td>
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<td></td>
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<p>从各种源构造数值数组。</p>
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<div class="t-li1"><span class="t-li">1)</span> 默认构造函数。构造空数值数组。</div>
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<div class="t-li1"><span class="t-li">2)</span> 以 <code>count</code> 个值初始化的元素副本构造数值数组。</div>
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<div class="t-li1"><span class="t-li">3)</span> 以 <code>count</code> 个 <code>val</code> 副本构造数值数组。</div>
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<div class="t-li1"><span class="t-li">4)</span> 构造拥有从来自 <code>vals</code> 所指向的数组的 <code>count</code> 个值的副本的数值数组。若此数组含少于 <code>count</code> 个值，则行为未定义。</div>
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<div class="t-li1"><span class="t-li">5)</span> 复制构造函数。构造有 <code>other</code> 内容副本的数值数组。</div>
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<div class="t-li1"><span class="t-li">6)</span> 移动构造函数。用移动语义构造有 <code>other</code> 内容的数值数组。</div>
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<div class="t-li1"><span class="t-li">7-10)</span> <a href="cpp-language-converting_constructor.html">转换构造函数</a>。转换对应数据结构为 <code>valarray</code> 。</div>
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<div class="t-li1"><span class="t-li">11)</span> 构造拥有 initializer_list <code>il</code> 内容的数值数组。</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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<td>count</td>
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<td>-</td>
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<td>要构造的元素数</td>
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<td>val</td>
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<td>-</td>
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<td>用以初始化元素的值</td>
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<tr class="t-par">
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<td>vals</td>
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<td>-</td>
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<td>指向用作初始化内容的数组的指针</td>
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</tr>
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<tr class="t-par">
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<td>other</td>
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<td>-</td>
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<td>用作源初始化内容的另一数值数组</td>
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</tr>
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<tr class="t-par">
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<td>sa</td>
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<td>-</td>
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<td>用以初始化元素的切片数组</td>
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</tr>
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<tr class="t-par">
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<td>gsa</td>
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<td>-</td>
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<td>用以初始化元素的通用切片数组</td>
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</tr>
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<tr class="t-par">
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<td>ma</td>
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<td>-</td>
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<td>用以初始化元素的掩码数组</td>
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<td>ia</td>
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<td>-</td>
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<td>用以初始化元素的间接数组</td>
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<td>il</td>
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<td>-</td>
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<td>用以初始化元素的 initializer_list</td>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<div class="t-li1"><span class="t-li">1-5, 7-11)</span> 可能抛出实现定义的异常。</div>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
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<td class="mbox-empty-cell"></td>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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</div>
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<div class="visualClear"></div>
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