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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">llrint</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="n"><a href="rebind.html">rebind_t</a></span><span class="o"><</span><span class="kt">long</span><span class="w"> </span><span class="kt">long</span><span class="p">,</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">llrint</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><code><a href="basic_vec.html">basic_vec</a></code>の各要素について、現在の丸めモードに従って最も近い整数値に丸め、<code>long long</code>を要素型とする<code><a href="basic_vec.html">basic_vec</a></code>として返す。<code><a href="llround.html">llround</a></code>とは異なり丸めモードに従い、結果が元の値と異なる場合に<code>FE_INEXACT</code><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>を送出しうる。</p>
<p>制約<code><a href="math-floating-point.html">math-floating-point</a></code>は、<code>V</code>が浮動小数点要素の<code><a href="basic_vec.html">basic_vec</a></code>、またはそこから<code><a href="basic_vec.html">basic_vec</a></code>を導出可能なスカラー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<code><a href="basic_vec.html">basic_vec</a></code>型を表す。<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>の型は、要素数はそのままに要素型を<code>long long</code>とした<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>について、<code>x</code>の対応する要素に<code><a href="../cmath.html"><cmath></a></code>の<code><a href="../cmath/llrint.html">llrint</a></code>を適用した結果で初期化された<code>rebind_t<long long, deduced-vec-t<V>></code>型の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="34ebfce7151dc6f00eeccd0ada31c9370c031fed"><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"><a href="basic_vec.html">simd::vec</a></span><span class="o"><</span><span class="kt">float</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">constexpr</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">a</span><span class="p">[]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mf">0.5f</span><span class="p">,</span><span class="w"> </span><span class="mf">1.5f</span><span class="p">,</span><span class="w"> </span><span class="mf">2.5f</span><span class="p">,</span><span class="w"> </span><span class="mf">3.5f</span><span class="p">};</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">a</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="c1">// 既定の丸めモード（最近接偶数への丸め）で最も近い整数（long long）に丸める</span>
<span class="w"> </span><span class="n"><a href="rebind.html">simd::rebind_t</a></span><span class="o"><</span><span class="kt">long</span><span class="w"> </span><span class="kt">long</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="basic_vec.html">simd::vec</a></span><span class="o"><</span><span class="kt">float</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::llrint</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="kt">int</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="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="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</h3>
<p><pre><code>0 2 2 4
</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="lrint.html">std::simd::lrint</a></code></li>
<li><code><a href="rint.html">std::simd::rint</a></code></li>
<li><code><a href="llround.html">std::simd::llround</a></code></li>
<li><code><a href="../cmath/llrint.html">std::llrint</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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