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<div class="identifier-type">function template</div><div class="header"><simd></div><h1 itemprop="name"><span class="namespace" title="namespace std::simd">std::simd::</span><span class="token">lgamma</span><span class="cpp cpp26" title="C++26で追加">(C++26)</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="o">::</span><span class="nn">simd</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">template</span><span class="o"><</span><span class="n"><a href="math-floating-point.html">math-floating-point</a></span><span class="w"> </span><span class="n">V</span><span class="o">></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n"><a href="deduced-vec-t.html">deduced-vec-t</a></span><span class="o"><</span><span class="n">V</span><span class="o">></span><span class="w"> </span><span class="n">lgamma</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">V</span><span class="o">&</span><span class="w"> </span><span class="n">x</span><span class="p">);</span><span class="w"> </span><span class="c1">// C++26</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>浮動小数点要素型の<code><a href="basic_vec.html">basic_vec</a></code>（またはスカラーの浮動小数点数）について、各要素に<code><a href="../cmath.html"><cmath></a></code>の<code><a href="../cmath/lgamma.html">lgamma</a></code>を適用し、各要素のガンマ関数の絶対値の自然対数を求める。</p>
<p>制約<code><a href="math-floating-point.html">math-floating-point</a></code>は、<code>V</code>が浮動小数点要素型の<code><a href="basic_vec.html">basic_vec</a></code>、またはスカラーの浮動小数点型であることを表す説明専用のコンセプトである。<code><a href="deduced-vec-t.html">deduced-vec-t<V></a></code>は、<code>V</code>に対応するデータ並列型（<code>V</code>がスカラーの場合は既定のABIをもつ<code><a href="basic_vec.html">basic_vec</a></code>）である。</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>各要素<code>i</code>（<code>0</code>以上<code>deduced-vec-t<V>::size()</code>未満）について、<code>x[i]</code>に<code><a href="../cmath.html"><cmath></a></code>の<code><a href="../cmath/lgamma.html">lgamma</a></code>を適用した結果で要素ごとに初期化された<code><a href="basic_vec.html">basic_vec</a></code>オブジェクトを返す。</p>
<p>ある要素<code>i</code>について定義域エラー・極エラー・値域エラーが発生する場合、その要素の値は<a class="cpprefjp-defined-word" data-desc="未規定の動作。事前の断りなく処理系によって異なる動作をする" href="../../implementation-compliance.html#dfn-unspecified-behavior">未規定</a>である。</p>
<h2>備考</h2>
<p><code><a href="../cerrno/errno.html">errno</a></code>にアクセスするか否かは<a class="cpprefjp-defined-word" data-desc="未規定の動作。事前の断りなく処理系によって異なる動作をする" href="../../implementation-compliance.html#dfn-unspecified-behavior">未規定</a>である。</p>
<h2>例</h2>
<p><div class="yata" id="82a931bd317d88e9086b4a236ac28ae0bacecbba"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../simd.html"><simd></a></span>
<span class="cp">#include <a href="../print.html"><print></a></span>
<span class="k">namespace</span><span class="w"> </span><span class="nn">simd</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nn">std</span><span class="o">::</span><span class="nn">simd</span><span class="p">;</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="n">simd</span><span class="o">::</span><span class="n">vec</span><span class="o"><</span><span class="kt">double</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="o">></span><span class="w"> </span><span class="n">v</span><span class="p">([](</span><span class="kt">int</span><span class="w"> </span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mf">1.0</span><span class="p">;</span><span class="w"> </span><span class="p">});</span><span class="w"> </span><span class="c1">// {1, 2, 3, 4}</span>
<span class="w"> </span><span class="c1">// 各要素のガンマ関数の絶対値の自然対数を求める</span>
<span class="w"> </span><span class="n">simd</span><span class="o">::</span><span class="n">vec</span><span class="o"><</span><span class="kt">double</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="o">></span><span class="w"> </span><span class="n">r</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><span style="color:#ff0000">simd::lgamma</span></span><span class="p">(</span><span class="n">v</span><span class="p">);</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n"><a href="../cstddef/size_t.html">std::size_t</a></span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="n">r</span><span class="p">.</span><span class="n">size</span><span class="p">();</span><span class="w"> </span><span class="o">++</span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../print/print.html">std::print</a></span><span class="p">(</span><span class="s">"{} "</span><span class="p">,</span><span class="w"> </span><span class="n">r</span><span class="p">[</span><span class="n">i</span><span class="p">]);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n"><a href="../print/println.html">std::println</a></span><span class="p">(</span><span class="s">""</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力例</h3>
<p><pre><code>0 0 0.6931471805599453 1.791759469228055
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++26</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: 22 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
<li><a href="../../implementation.html#gcc">GCC</a>: 16.1 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2026 Update 2 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
</ul>
<h2>関連項目</h2>
<ul>
<li><code><a href="tgamma.html">std::simd::tgamma</a></code></li>
<li><code><a href="../cmath/lgamma.html">std::lgamma</a></code></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2024/p1928r15.pdf" target="_blank">P1928R15 std::simd — merge data-parallel types from the Parallelism TS 2</a><ul>
<li>C++26で追加された</li>
</ul>
</li>
</ul></div>
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