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<title>&#26631;&#20934;&#24211;&#22836;&#25991;&#20214; &lt;limits&gt;</title>
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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;limits&gt;</h1>
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<p>&#27492;&#22836;&#25991;&#20214;&#26159;<a href="cpp-types.html">&#31867;&#22411;&#25903;&#25345;</a>&#24211;&#30340;&#19968;&#37096;&#20998;&#12290;</p>
<h3><span class="mw-headline" id=".E5.A3.B0.E6.98.8E">&#22768;&#26126;</span></h3>
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<div><a href="cpp-types-numeric_limits.html"><span class="t-lines"><span>numeric_limits</span></span></a></div>
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<td>&#25552;&#20379;&#26597;&#35810;&#25152;&#26377;&#22522;&#30784;&#25968;&#20540;&#31867;&#22411;&#30340;&#24615;&#36136;&#30340;&#25509;&#21475;&#12290;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
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<div><a href="cpp-types-numeric_limits-float_round_style.html"><span class="t-lines"><span>float_round_style</span></span></a></div>
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<td>&#25351;&#31034;&#28014;&#28857;&#33293;&#20837;&#27169;&#24335;<br />
<span class="t-mark">(&#26522;&#20030;)</span></td>
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<div><a href="cpp-types-numeric_limits-float_denorm_style.html"><span class="t-lines"><span>float_denorm_style</span></span></a></div>
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<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="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">class</span> numeric_limits<span class="sy4">;</span>
<span class="kw2">enum</span> float_round_style <span class="br0">{</span>
round_indeterminate <span class="sy1">=</span> <span class="sy2">-</span><span class="nu0">1</span>,
round_toward_zero <span class="sy1">=</span> <span class="nu0">0</span>,
round_to_nearest <span class="sy1">=</span> <span class="nu0">1</span>,
round_toward_infinity <span class="sy1">=</span> <span class="nu0">2</span>,
round_toward_neg_infinity <span class="sy1">=</span> <span class="nu0">3</span>,
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw2">enum</span> float_denorm_style <span class="br0">{</span>
denorm_indeterminate <span class="sy1">=</span> <span class="sy2">-</span><span class="nu0">1</span>,
denorm_absent <span class="sy1">=</span> <span class="nu0">0</span>,
denorm_present <span class="sy1">=</span> <span class="nu0">1</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">bool</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">signed</span> <span class="kw4">char</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">unsigned</span> <span class="kw4">char</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span>char8_t<span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">char16_t</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">char32_t</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">wchar_t</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">short</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">long</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">long</span> <span class="kw4">long</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">unsigned</span> <span class="kw4">short</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">unsigned</span> <span class="kw4">int</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">unsigned</span> <span class="kw4">long</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">float</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">long</span> <span class="kw4">double</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p><br /></p>
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::numeric_limits">&#31867;&#27169;&#26495; <span class="t-lc"><a href="cpp-types-numeric_limits.html">std::numeric_limits</a></span></span></h4>
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<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="kw1">class</span> numeric_limits <span class="br0">{</span>
<span class="kw1">public</span><span class="sy4">:</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_specialized <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> T min<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> T<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> T max<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> T<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> T lowest<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> T<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> digits <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> digits10 <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> max_digits10 <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_signed <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_integer <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_exact <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> radix <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> T epsilon<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> T<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> T round_error<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> T<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> min_exponent <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> min_exponent10 <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> max_exponent <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> max_exponent10 <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> has_infinity <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> has_quiet_NaN <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> has_signaling_NaN <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> float_denorm_style has_denorm <span class="sy1">=</span> denorm_absent<span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> has_denorm_loss <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> T infinity<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> T<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> T quiet_NaN<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> T<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> T signaling_NaN<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> T<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> T denorm_min<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> T<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_iec559 <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_bounded <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_modulo <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> traps <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> tinyness_before <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> float_round_style round_style <span class="sy1">=</span> round_toward_zero<span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span></pre></div>
</div>
<h4><span class="mw-headline" id="std::numeric_limits.3Cbool.3E_.E7.89.B9.E5.8C.96"><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-numeric_limits.html"><span class="kw344">std::<span class="me2">numeric_limits</span></span></a><span class="sy1">&lt;</span><span class="kw4">bool</span><span class="sy1">&gt;</span></span></span> &#29305;&#21270;</span></h4>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> numeric_limits<span class="sy1">&lt;</span><span class="kw4">bool</span><span class="sy1">&gt;</span> <span class="br0">{</span>
<span class="kw1">public</span><span class="sy4">:</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_specialized <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> min<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="kw2">false</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> max<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="kw2">true</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> lowest<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="kw2">false</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> digits <span class="sy1">=</span> <span class="nu0">1</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> digits10 <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> max_digits10 <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_signed <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_integer <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_exact <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> radix <span class="sy1">=</span> <span class="nu0">2</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> epsilon<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> round_error<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> min_exponent <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> min_exponent10 <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> max_exponent <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">int</span> max_exponent10 <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> has_infinity <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> has_quiet_NaN <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> has_signaling_NaN <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> float_denorm_style has_denorm <span class="sy1">=</span> denorm_absent<span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> has_denorm_loss <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> infinity<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> quiet_NaN<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> signaling_NaN<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> denorm_min<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_iec559 <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_bounded <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> is_modulo <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> traps <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> tinyness_before <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> float_round_style round_style <span class="sy1">=</span> round_toward_zero<span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span></pre></div>
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