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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">&#26631;&#20934;&#24211;&#22836;&#25991;&#20214;</span> &lt;numbers&gt;</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-header.html">header</a></span></div>
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<p>&#27492;&#22836;&#25991;&#20214;&#26159;<a href="cpp-numeric.html">&#25968;&#20540;</a>&#24211;&#30340;&#19968;&#37096;&#20998;&#12290;</p>
<h3><span class="mw-headline" id=".E6.95.B0.E5.AD.A6.E5.B8.B8.E6.95.B0_.28C.2B.2B20_.E8.B5.B7.29"><a href="cpp-numeric-constants.html">&#25968;&#23398;&#24120;&#25968;</a> <span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></span></h3>
<p>&#22836;&#25991;&#20214; <strong class="selflink"><tt>&lt;numbers&gt;</tt></strong> &#25552;&#20379;&#25968;&#20010;&#25968;&#23398;&#24120;&#25968;&#65292;&#20363;&#22914; <span class="t-lc">std::numbers::pi</span> &#25110; <span class="t-lc">std::numbers::sqrt2</span> &#12290;</p>
<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">&#27010;&#35201;</span></h3>
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<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">numbers</span> <span class="br0">{</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T e_v <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T log2e_v <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T log10e_v <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T pi_v <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T inv_pi_v <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T inv_sqrtpi_v <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T ln2_v <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T ln10_v <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T sqrt2_v <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T sqrt3_v <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T inv_sqrt3_v <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T egamma_v <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T phi_v <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>floating_point T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T e_v<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>floating_point T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T log2e_v<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>floating_point T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T log10e_v<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>floating_point T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T pi_v<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>floating_point T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T inv_pi_v<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>floating_point T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T inv_sqrtpi_v<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>floating_point T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T ln2_v<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>floating_point T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T ln10_v<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>floating_point T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T sqrt2_v<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>floating_point T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T sqrt3_v<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>floating_point T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T inv_sqrt3_v<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>floating_point T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T egamma_v<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>floating_point T<span class="sy1">&gt;</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> T phi_v<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">double</span> e <span class="sy1">=</span> e_v<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">double</span> log2e <span class="sy1">=</span> log2e_v<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">double</span> log10e <span class="sy1">=</span> log10e_v<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">double</span> pi <span class="sy1">=</span> pi_v<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">double</span> inv_pi <span class="sy1">=</span> inv_pi_v<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">double</span> inv_sqrtpi <span class="sy1">=</span> inv_sqrtpi_v<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">double</span> ln2 <span class="sy1">=</span> ln2_v<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">double</span> ln10 <span class="sy1">=</span> ln10_v<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">double</span> sqrt2 <span class="sy1">=</span> sqrt2_v<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">double</span> sqrt3 <span class="sy1">=</span> sqrt3_v<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">double</span> inv_sqrt3 <span class="sy1">=</span> inv_sqrt3_v<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">double</span> egamma <span class="sy1">=</span> egamma_v<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">double</span> phi <span class="sy1">=</span> phi_v<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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