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<div class="identifier-type">function</div><div class="header"><cfenv></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">fetestexcept</span><span class="cpp cpp11" title="C++11で追加">(C++11)</span></h1>
<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span><span class="w"> </span><span class="nn">std</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="nf">fetestexcept</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">excepts</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>指定された<a class="cpprefjp-defined-word" data-desc="floating-point exception。ゼロ除算やオーバーフロー等の算術的な問題が発生した際に、浮動小数点環境に設定される状態フラグのこと。C++言語機能の例外機構（try-catch）とは異なる。" href="../cfenv.html">浮動小数点例外</a>が設定されるかを判定する。</p>
<p>この関数は、現在発生している<a class="cpprefjp-defined-word" data-desc="floating-point exception。ゼロ除算やオーバーフロー等の算術的な問題が発生した際に、浮動小数点環境に設定される状態フラグのこと。C++言語機能の例外機構（try-catch）とは異なる。" href="../cfenv.html">浮動小数点例外</a>のうち、指定された<a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a>の集合のみを抽出して返す。</p>
<h2><a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価結果となるオブジェクト・値">戻り値</a></h2>
<p>ビット演算のORで複数指定された<a class="cpprefjp-defined-word" data-desc="floating-point exception。ゼロ除算やオーバーフロー等の算術的な問題が発生した際に、浮動小数点環境に設定される状態フラグのこと。C++言語機能の例外機構（try-catch）とは異なる。" href="../cfenv.html">浮動小数点例外</a>の種類<code>excepts</code>の、<a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a>発生状態を返す。</p>
<h2>例</h2>
<p><div class="yata" id="3016ba88509fe5fbccc60c0f0f97cff44d19d441"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../cmath.html"><cmath></a></span>
<span class="cp">#include <a href="../cfenv.html"><cfenv></a></span>
<span class="cp">#include <a href="../limits.html"><limits></a></span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span>
<span class="p">{</span>
<span class="w"> </span><span class="c1">// ひとつの浮動小数点例外が発生しているかを確認する。</span>
<span class="w"> </span><span class="c1">// ここでは、<a href="fe_divbyzero.html">FE_DIVBYZERO</a> (ゼロ除算)の状態のみを取得している。</span>
<span class="w"> </span><span class="c1">// 指定した浮動小数点例外がひとつであれば、戻り値が0でないことが例外発生中と判断できる</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">result</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">1.0f</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="mf">0.0f</span><span class="p">;</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n"><span style="color:#ff0000">std::fetestexcept</span></span><span class="p">(</span><span class="n"><a href="fe_divbyzero.html">FE_DIVBYZERO</a></span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="c1">// 浮動小数点数に対してゼロ除算が行われた</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"zero divided"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n"><a href="feclearexcept.html">std::feclearexcept</a></span><span class="p">(</span><span class="n"><a href="fe_all_except.html">FE_ALL_EXCEPT</a></span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"====="</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="c1">// 複数の浮動小数点例外が発生しているかを確認する。</span>
<span class="w"> </span><span class="c1">// ここでは、浮動小数点例外の全種類がビットORでつながれた<a href="fe_all_except.html">FE_ALL_EXCEPT</a>を指定している。</span>
<span class="w"> </span><span class="c1">// これによって、全ての浮動小数点例外の状態を取得している。</span>
<span class="w"> </span><span class="c1">// fetestexcept(<a href="fe_inexact.html">FE_INEXACT</a> | <a href="fe_overflow.html">FE_OVERFLOW</a>)のようにして、</span>
<span class="w"> </span><span class="c1">// 明示的にORで複数の浮動小数点例外を指定してもよい。</span>
<span class="w"> </span><span class="c1">//</span>
<span class="w"> </span><span class="c1">// 複数の浮動小数点例外の状態を取得した場合は、ビットANDを使用して、</span>
<span class="w"> </span><span class="c1">// 特定の浮動小数点例外が発生しているかを確認する。</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">result</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../limits/numeric_limits.html">std::numeric_limits</a></span><span class="o"><</span><span class="kt">double</span><span class="o">>::</span><span class="n"><a href="../limits/numeric_limits/max.html">max()</a></span><span class="p">;</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">excepts</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><span style="color:#ff0000">std::fetestexcept</span></span><span class="p">(</span><span class="n"><a href="fe_all_except.html">FE_ALL_EXCEPT</a></span><span class="p">);</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">excepts</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="n"><a href="fe_inexact.html">FE_INEXACT</a></span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"inexact"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">excepts</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="n"><a href="fe_invalid.html">FE_INVALID</a></span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"invalid"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">excepts</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="n"><a href="fe_overflow.html">FE_OVERFLOW</a></span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"overflow"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">excepts</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="n"><a href="fe_underflow.html">FE_UNDERFLOW</a></span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"underflow"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力例</h3>
<p><pre><code>zero divided
=====
inexact
overflow
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++11</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: 3.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#gcc">GCC</a>: 4.3.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#icc">ICC</a>: ??</li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2013 <span aria-label="検証済" role="img" title="検証済">✅</span>, 2015 <span aria-label="検証済" role="img" title="検証済">✅</span><ul>
<li>コンパイルオプション<code>/fp:strict</code>または<code>#pragma fenv_access (on)</code>が必要。さもなくば、正しく動作しないおそれがある。</li>
</ul>
</li>
</ul></div>
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