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‎reference/linalg.html

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<p class="text-right"><small>
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2024-06-18T05:47:07">
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2024年06月18日 05時47分07秒
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<span itemprop="datePublished" content="2024-06-19T10:39:43">
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2024年06月19日 10時39分43秒
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<td>C++26</td>
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<tr>
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<td><code>vector_abs_sum</code></td>
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<td><code><a href="linalg/vector_abs_sum.html">vector_abs_sum</a></code></td>
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<td>xASUM: ベクトル要素の絶対値和を求める (function template)</td>
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<td>C++26</td>
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‎reference/linalg/abs-if-needed.html

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<p>そうでない場合、式<code>abs(E)</code>が下記宣言を含むコンテキストにおいてオーバーロード解決を行った結果が妥当であるとき、<code>abs(E)</code>
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<div class="codehilite"><pre><span></span><code><span class="k">template</span><span class="o">&lt;</span><span class="k">class</span> <span class="nc">T</span><span class="o">&gt;</span> <span class="n">T</span> <span class="n">conj</span><span class="p">(</span><span class="k">const</span> <span class="n">T</span><span class="o">&amp;</span><span class="p">)</span> <span class="o">=</span> <span class="k">delete</span><span class="p">;</span>
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<div class="codehilite"><pre><span></span><code><span class="k">template</span><span class="o">&lt;</span><span class="k">class</span> <span class="nc">T</span><span class="o">&gt;</span>
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<span class="n">T</span> <span class="n">abs</span><span class="p">(</span><span class="k">const</span> <span class="n">T</span><span class="o">&amp;</span><span class="p">)</span> <span class="o">=</span> <span class="k">delete</span><span class="p">;</span>
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‎reference/linalg/imag-if-needed.html

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2024年06月19日 10時39分43秒
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<div class="identifier-type">function</div><div class="header">&lt;linalg&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std::linalg">std::linalg::</span><span class="token">imag-if-needed</span><span class="cpp cpp26" title="C++26で追加">(C++26)</span></h1>
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<div itemprop="articleBody"><h2>概要</h2>
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<p><code>imag-if-needed</code>は、必要に応じて複素数の虚部を返す、説明専用の関数オブジェクトである。</p>
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<p>型<code>T</code>の式<code>E</code>に対して、式<code>imag-if-needed(E)</code>は次と等価である。</p>
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<ol>
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<li><code>T</code>が算術型でなく、式<code>imag(E)</code>が下記宣言を含むコンテキストにおいてオーバーロード解決を行った結果が妥当であるとき、<code>imag(E)</code>
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<br />
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<div class="codehilite"><pre><span></span><code><span class="k">template</span><span class="o">&lt;</span><span class="k">class</span> <span class="nc">T</span><span class="o">&gt;</span>
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<span class="n">T</span> <span class="n">imag</span><span class="p">(</span><span class="k">const</span> <span class="n">T</span><span class="o">&amp;</span><span class="p">)</span> <span class="o">=</span> <span class="k">delete</span><span class="p">;</span>
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</code></pre></div>
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</li>
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</ol>
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<h2>備考</h2>
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<p>オーバーロード解決により選択された関数が入力された複素数の実部を返さないとき、プログラムは<a class="cpprefjp-defined-word" data-desc="プログラムが適格でないこと。コンパイルエラーなどになる" href="../../implementation-compliance.html#dfn-ill-formed">不適格</a>となる。</p>
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<h2>バージョン</h2>
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<h3>言語</h3>
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<ul>
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<li>C++26</li>
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<h2>参照</h2>
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<ul>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p1673r13.html" target="_blank">P1673R13 A free function linear algebra interface based on the BLAS</a></li>
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