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‎reference/mdspan.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="2024-02-27T15:48:24">
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2024年02月27日 15時48分24秒
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<span itemprop="datePublished" content="2024-07-18T10:05:39">
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2024年07月18日 10時05分39秒
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</span>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
@@ -222,6 +222,11 @@ <h2>多次元配列サイズ</h2>
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<td>全次元が動的な多次元配列のサイズを表す値 (alias template)</td>
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<td>C++23</td>
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</tr>
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<tr>
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<td><code><a href="mdspan/extents.html">dims</a></code></td>
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<td>全次元が動的な多次元配列のサイズを表す値 (alias template)</td>
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<td>C++26</td>
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</tr>
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</tbody>
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</table>
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<h2>レイアウトマッピング</h2>

‎reference/mdspan/extents.html

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</head>
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<body>
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;mdspan&#34;], &#34;id-type&#34;: [&#34;class template&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;cpp&#34;: [&#34;cpp23&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;24f9c878ad4fdca1a18cc8019f06a1fe50eaa5d4&#34;, &#34;source&#34;: &#34;#include &lt;mdspan&gt;\n\nint main()\n{\n // \u56fa\u5b9a\u8981\u7d20\u6570 3x3 \u306e2\u6b21\u5143\u914d\u5217\u30b5\u30a4\u30ba\n std::extents&lt;size_t, 3, 3&gt; ext3x3;\n\n // \u52d5\u7684\u8981\u7d20\u6570\u304b\u3089\u306a\u308b2\u6b21\u5143\u914d\u5217\u30b5\u30a4\u30ba\u3092 4x2 \u3067\u521d\u671f\u5316\n std::dextents&lt;size_t, 2&gt; ext2d{4, 2};\n\n // 2\u500b\u306e\u52d5\u7684\u8981\u7d20\u6570(\u9ad8\u3055,\u5e45)\u3068\u9759\u7684\u8981\u7d20\u6570(RGBA=4)\u304b\u3089\u306a\u308b3\u6b21\u5143\u914d\u5217\u30b5\u30a4\u30ba\n using ColorImageExt = std::extents&lt;size_t, std::dynamic_extent, std::dynamic_extent, 4&gt;;\n ColorImageExt image_ext{128, 128};\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;mdspan&#34;, &#34;extents&#34;]}">
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;mdspan&#34;], &#34;id-type&#34;: [&#34;class template&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;cpp&#34;: [&#34;cpp23&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;72f1b6e9f8e52f61c117c8263d016ed1df87104e&#34;, &#34;source&#34;: &#34;#include &lt;mdspan&gt;\n\nint main()\n{\n // \u56fa\u5b9a\u8981\u7d20\u6570 3x3 \u306e2\u6b21\u5143\u914d\u5217\u30b5\u30a4\u30ba\n std::extents&lt;size_t, 3, 3&gt; ext3x3;\n\n#if 1\n // \u52d5\u7684\u8981\u7d20\u6570\u304b\u3089\u306a\u308b2\u6b21\u5143\u914d\u5217\u30b5\u30a4\u30ba\u3092 4x2 \u3067\u521d\u671f\u5316\n std::dextents&lt;size_t, 2&gt; ext2d{4, 2};\n#else\n // C++26: dims&lt;2&gt;\u306fdextents&lt;size_t, 2&gt;\u3068\u7b49\u4fa1\n std::dims&lt;2&gt; ext2d{4, 2};\n#endif\n\n // 2\u500b\u306e\u52d5\u7684\u8981\u7d20\u6570(\u9ad8\u3055,\u5e45)\u3068\u9759\u7684\u8981\u7d20\u6570(RGBA=4)\u304b\u3089\u306a\u308b3\u6b21\u5143\u914d\u5217\u30b5\u30a4\u30ba\n using ColorImageExt = std::extents&lt;size_t, std::dynamic_extent, std::dynamic_extent, 4&gt;;\n ColorImageExt image_ext{128, 128};\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;mdspan&#34;, &#34;extents&#34;]}">
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<nav class="navbar navbar-default" role="navigation">
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<div class="container-fluid">
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<div class="navbar-header">
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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="2024-01-08T13:35:12">
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2024年01月08日 13時35分12秒
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<span itemprop="datePublished" content="2024-07-18T10:05:39">
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2024年07月18日 10時05分39秒
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</span>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span class="k">template</span><span class="o">&lt;</span><span class="k">class</span> <span class="nc">IndexType</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">Rank</span><span class="o">&gt;</span>
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<span class="k">using</span> <span class="n">dextents</span> <span class="o">=</span> <span class="n"><i>see below</i></span><span class="p">;</span>
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<span class="k">template</span><span class="o">&lt;</span><span class="kt">size_t</span> <span class="n">Rank</span><span class="p">,</span> <span class="k">class</span> <span class="nc">IndexType</span> <span class="o">=</span> <span class="kt">size_t</span><span class="o">&gt;</span>
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<span class="k">using</span> <span class="n">dims</span> <span class="o">=</span> <span class="n"><i>see below</i></span><span class="p">;</span> <span class="c1">// C++26以降</span>
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<span class="p">}</span>
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</code></pre></div>
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</p>
@@ -242,6 +245,8 @@ <h3>要素数の動的／静的指定</h3>
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<h3>エイリアステンプレート</h3>
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<p>エイリアステンプレート<code>dextents</code>は、次元数<code>Rank</code>かつ全次元が動的要素数で指定される<code>extents</code>を生成する。
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例えば<code>dextents&lt;size_t, 2&gt;</code>は<code>extents&lt;size_t, dynamic_extent, dynamic_extent&gt;</code>の略記となる。</p>
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<p>C++26では、テンプレートパラメータ<code>IndexType</code>がデフォルト引数<code>size_t</code>をもつエイリアステンプレート<code>dims</code>が追加される。
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例えば<code>dims&lt;2&gt;</code>は<code>dextents&lt;size_t, 2&gt;</code>と等価であり、<code>extents&lt;size_t, dynamic_extent, dynamic_extent&gt;</code>の略記となる。</p>
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<h2><a class="cpprefjp-defined-word" data-desc="満たさなければプログラムが不適格となる要件。`static_assert`や関数のdelete宣言などに相当する">適格要件</a></h2>
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<ul>
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<li><code>IndexType</code>は符号付き整数型または符号無し整数型</li>
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</tbody>
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</table>
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<h2>例</h2>
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<p><div class="yata" id="24f9c878ad4fdca1a18cc8019f06a1fe50eaa5d4"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../mdspan.html">&lt;mdspan&gt;</a></span><span class="cp"></span>
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<p><div class="yata" id="72f1b6e9f8e52f61c117c8263d016ed1df87104e"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../mdspan.html">&lt;mdspan&gt;</a></span><span class="cp"></span>
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<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="c1">// 固定要素数 3x3 の2次元配列サイズ</span>
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<span class="n"><span style="color:#ff0000">std::extents</span></span><span class="o">&lt;</span><span class="kt">size_t</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">3</span><span class="o">&gt;</span> <span class="n">ext3x3</span><span class="p">;</span>
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<span class="cp">#if 1</span>
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<span class="c1">// 動的要素数からなる2次元配列サイズを 4x2 で初期化</span>
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<span class="n"><span style="color:#ff0000">std::dextents</span></span><span class="o">&lt;</span><span class="kt">size_t</span><span class="p">,</span> <span class="mi">2</span><span class="o">&gt;</span> <span class="n">ext2d</span><span class="p">{</span><span class="mi">4</span><span class="p">,</span> <span class="mi">2</span><span class="p">};</span>
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<span class="cp">#else</span>
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<span class="c1">// C++26: dims&lt;2&gt;はdextents&lt;size_t, 2&gt;と等価</span>
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<span class="n"><span style="color:#ff0000">std::dims</span></span><span class="o">&lt;</span><span class="mi">2</span><span class="o">&gt;</span> <span class="n">ext2d</span><span class="p">{</span><span class="mi">4</span><span class="p">,</span> <span class="mi">2</span><span class="p">};</span>
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<span class="cp">#endif</span>
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<span class="k">using</span> <span class="n">ColorImageExt</span> <span class="o">=</span> <span class="n"><span style="color:#ff0000">std::extents</span></span><span class="o">&lt;</span><span class="kt">size_t</span><span class="p">,</span> <span class="n"><a href="../span/dynamic_extent.html">std::dynamic_extent</a></span><span class="p">,</span> <span class="n"><a href="../span/dynamic_extent.html">std::dynamic_extent</a></span><span class="p">,</span> <span class="mi">4</span><span class="o">&gt;</span><span class="p">;</span>
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<ul>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p0009r18.html" target="_blank">P0009R18 MDSPAN</a></li>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2599r2.pdf" target="_blank">P2599R2 <code>index_type</code> &amp; <code>size_type</code> in <code>mdspan</code></a></li>
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<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2024/p2389r2.html" target="_blank">P2389R2 <code>dextents</code> Index Type Parameter</a><ul>
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<li>C++26から、エイリアステンプレート<code>dims</code>が追加される。</li>
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</ul>
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</li>
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</ul></div>
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</div>

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