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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>real<span style="font-size:0.7em; line-height:130%">(std::complex)</span></h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-numeric.html">numeric</a>&lrm; | <a href="cpp-numeric-complex.html">complex</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-complex.html">&lt;complex&gt;</a></code></div>
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<td rowspan="142">(1)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T <span class="sy1">&gt;</span><br />
T real<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-numeric-complex.html"><span class="kw1472">std::<span class="me2">complex</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy3">&amp;</span> z <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx14">(C++14 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T <span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> T real<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-numeric-complex.html"><span class="kw1472">std::<span class="me2">complex</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy3">&amp;</span> z <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span></td>
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<td rowspan="142">(2)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">float</span> real<span class="br0">(</span> <span class="kw4">float</span> z <span class="br0">)</span><span class="sy4">;</span><br /></span>
<p><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> DoubleOrInteger <span class="sy1">&gt;</span><br />
<span class="kw4">double</span> real<span class="br0">(</span> DoubleOrInteger z <span class="br0">)</span><span class="sy4">;</span><br /></p>
<span class="kw4">long</span> <span class="kw4">double</span> real<span class="br0">(</span> <span class="kw4">long</span> <span class="kw4">double</span> z <span class="br0">)</span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx14">(C++14 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">float</span> real<span class="br0">(</span> <span class="kw4">float</span> z <span class="br0">)</span><span class="sy4">;</span><br /></span>
<p><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> DoubleOrInteger <span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> <span class="kw4">double</span> real<span class="br0">(</span> DoubleOrInteger z <span class="br0">)</span><span class="sy4">;</span><br /></p>
<span class="kw4">constexpr</span> <span class="kw4">long</span> <span class="kw4">double</span> real<span class="br0">(</span> <span class="kw4">long</span> <span class="kw4">double</span> z <span class="br0">)</span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span></td>
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<div class="t-li1"><span class="t-li">1)</span> &#36820;&#22238;&#22797;&#25968; <code>z</code> &#30340;&#23454;&#37096;&#65292;&#21363; <span class="t-c"><span class="mw-geshi cpp source-cpp">z.<span class="me1">real</span><span class="br0">(</span><span class="br0">)</span></span></span> &#12290;</div>
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<div class="t-li1"><span class="t-li">2)</span> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">float</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">double</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">double</span></span></span> &#21644;&#25152;&#26377;&#25972;&#25968;&#31867;&#22411;&#25552;&#20379;&#39069;&#22806;&#37325;&#36733;&#65292;&#23427;&#20204;&#34987;&#22788;&#29702;&#20026;&#25317;&#26377;&#38646;&#34394;&#37096;&#30340;&#22797;&#25968;&#12290;</div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>z</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p><code>z</code> &#30340;&#23454;&#37096;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-numeric-complex-real.html"><span class="t-lines"><span>real</span></span></a></div>
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<td>&#35775;&#38382;&#22797;&#25968;&#30340;&#23454;&#37096;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-numeric-complex-imag2.html"><span class="t-lines"><span>imag</span></span></a></div>
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<td>&#36820;&#22238;&#34394;&#37096;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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