107 lines
4.8 KiB
HTML
107 lines
4.8 KiB
HTML
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<title>std::polar(std::complex)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_numeric_complex_polar 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>polar<span style="font-size:0.7em; line-height:130%">(std::complex)</span></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-complex.html">complex</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-complex.html"><complex></a></code></div>
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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 <span class="sy1">></span><br />
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complex<span class="sy1"><</span>T<span class="sy1">></span> polar<span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&</span> r, <span class="kw4">const</span> T<span class="sy3">&</span> theta <span class="sy1">=</span> T<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>返回拥有绝对值 <code>r</code> 和辐角 <code>theta</code> 的复数。</p>
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<p>若 <code>r</code> 为负数或 NaN ，或若 <code>theta</code> 为无穷大，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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<td>r</td>
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<td>-</td>
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<td>模</td>
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<tr class="t-par">
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<td>theta</td>
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<td>-</td>
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<td>辐角</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>以 <code>r</code> 和 <code>theta</code> 确定的复数。</p>
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<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">缺陷报告</span></h3>
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<p>下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。</p>
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<table class="dsctable" style="font-size:0.8em">
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<th>DR</th>
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<th>应用于</th>
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<th>出版时的行为</th>
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<th>正确行为</th>
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<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue2459">LWG 2459</a></td>
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<td>C++98</td>
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<td>某些输入的行为不明</td>
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<td>使之为未定义</td>
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<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue2870">LWG 2870</a></td>
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<td>C++98</td>
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<td>参数 <span class="t-c"><span class="mw-geshi cpp source-cpp">theta</span></span> 的默认值不依赖于类型</td>
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<td>使之为依赖</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-numeric-complex-abs.html"><span class="t-lines"><span>abs<span class="t-dsc-small">(std::complex)</span></span></span></a></div>
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</td>
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<td>返回复数的模<br />
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<span class="t-mark">(函数模板)</span></td>
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<div><a href="cpp-numeric-complex-arg.html"><span class="t-lines"><span>arg</span></span></a></div>
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</td>
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<td>返回辐角<br />
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<span class="t-mark">(函数模板)</span></td>
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