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<div class="identifier-type">class template</div><div class="header"><mdspan></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">mdspan</span><span class="cpp cpp23" title="C++23で追加">(C++23)</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="k">template</span><span class="o"><</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">ElementType</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc"><a href="extents.html">Extents</a></span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc"><a href="LayoutMappingPolicy.html">LayoutPolicy</a></span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="layout_right.html">layout_right</a></span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc"><a href="AccessorPolicy.html">AccessorPolicy</a></span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="default_accessor.html">default_accessor</a></span><span class="o"><</span><span class="n">ElementType</span><span class="o">>></span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">mdspan</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>mdspan</code>は、任意のメモリブロックに対して多次元配列のようにアクセスする機能を提供するクラスである。
<code>mdspan</code>それ自体は参照先メモリブロックを所有せず、<a href="mdspan/op_at.html"><code>[]</code>演算子</a>を介して多次元配列のように見せかけるビュー(view)にすぎない。</p>
<p>クラスの名称<code>mdspan</code>は、1次元の範囲<code><a href="../span/span.html">std::span</a></code>に対する多次元(MultiDimensional)拡張に由来する。</p>
<p><code>mdspan</code>の特殊化<code>MDS</code>は<code><a href="../concepts/copyable.html">copyable</a></code>のモデルであり、かつ</p>
<ul>
<li><code><a href="../type_traits/is_nothrow_move_constructible.html">is_nothrow_move_constructible_v</a><MDS></code>が<code>true</code>、かつ</li>
<li><code><a href="../type_traits/is_nothrow_move_assignable.html">is_nothrow_move_assignable_v</a><MDS></code>が<code>true</code>、かつ</li>
<li><code><a href="../type_traits/is_nothrow_swappable.html">is_nothrow_swappable_v</a><MDS></code>が<code>true</code>となる。</li>
</ul>
<p>そのメンバ型<code>accessor_type</code>, <code>mapping_type</code>, <code>pointer</code>が<a href="../type_traits/is_trivially_copyable.html">トリビアルコピー可能</a>であるとき、<code>mdspan</code>の特殊化もトリビアルコピー可能である。</p>
<h3>テンプレートパラメータ</h3>
<p><code>mdspan</code>クラスでは、テンプレートパラメータを介して多次元配列ビューをカスタマイズできる。</p>
<ul>
<li><code>ElementType</code> : 多次元配列ビューの要素型</li>
<li><code>Extents</code> : 多次元配列の次元数(rank)と要素数(extent)</li>
<li><code>LayoutPolicy</code> : 多次元配列インデクスと要素位置の対応関係</li>
<li><code>AccessorPolicy</code> : 要素アクセス時の詳細挙動</li>
</ul>
<h3>説明専用メンバ変数</h3>
<p><code>mdspan</code>クラスは、下記の説明専用メンバ変数を保持する。</p>
<ul>
<li><code>acc_</code> : <code>accessor_type</code>型の<a href="AccessorPolicy.html">要素アクセサ</a></li>
<li><code>map_</code> : <code>mapping_type</code>型の<a href="LayoutMapping.html">レイアウトマッピング</a></li>
<li><code>ptr_</code> : <code>data_handle_type</code>型のメモリブロックへのハンドル（ポインタ）</li>
</ul>
<h2><a class="cpprefjp-defined-word" data-desc="関数等の意味論を構成する要素の1つ。Mandates。満たさなければプログラムが不適格となる要件。この要件は、オーバーロード解決によって選択された関数内での`static_assert`の定数条件式や、関数に対するdelete宣言などで表現できる">適格要件</a></h2>
<ul>
<li><code>ElementType</code>は抽象クラス型もしくは配列型のいずれでもない<a class="cpprefjp-defined-word" data-desc="型のサイズを決定できる型。不完全型ではない型">完全型</a>であり、かつ</li>
<li><code>Extents</code>は<code><a href="extents.html">extents</a></code>の特殊化であり、かつ</li>
<li><code><a href="../type_traits/is_same.html">is_same_v</a><ElementType, typename AccessorPolicy::element_type></code>が<code>true</code>であること。</li>
</ul>
<p><code>LayoutPolicy</code>は<a href="LayoutMappingPolicy.html">レイアウトマッピングポリシー要件</a>を満たし、かつ<code>AccessorPolicy</code>は<a href="AccessorPolicy.html">アクセサポリシー要件</a>を満たすこと。</p>
<h2>メンバ関数</h2>
<h3>構築・破棄</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="mdspan/op_constructor.html">(constructor)</a></code></td>
<td>コンストラクタ</td>
<td>C++23</td>
</tr>
<tr>
<td><code>(destructor)</code></td>
<td>デストラクタ</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="mdspan/op_assign.html">operator=</a></code></td>
<td>代入演算子</td>
<td>C++23</td>
</tr>
</tbody>
</table>
<h3>要素へのアクセス</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="mdspan/op_at.html">operator[]</a></code></td>
<td>多次元配列の要素アクセス</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="mdspan/at.html">at</a></code></td>
<td>多次元配列の要素アクセス</td>
<td>C++26</td>
</tr>
</tbody>
</table>
<h3>多次元配列サイズ</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="mdspan/rank.html">rank</a></code></td>
<td>多次元配列の次元数を取得する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="mdspan/rank_dynamic.html">rank_dynamic</a></code></td>
<td>多次元配列のうち動的要素数に指定された次元数を取得する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="mdspan/static_extent.html">static_extent</a></code></td>
<td>指定次元の静的要素数を取得する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="mdspan/extent.html">extent</a></code></td>
<td>指定次元の要素数を取得する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="mdspan/size.html">size</a></code></td>
<td>多次元インデクス空間のサイズを取得する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="mdspan/empty.html">empty</a></code></td>
<td>多次元インデクス空間がサイズ0か否かを取得する</td>
<td>C++23</td>
</tr>
</tbody>
</table>
<h3>メンバ変数アクセサ</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="mdspan/extents.html">extents</a></code></td>
<td>多次元配列のサイズを取得する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="mdspan/data_handle.html">data_handle</a></code></td>
<td>メモリブロックへのハンドル<code>ptr_</code>を取得する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="mdspan/mapping.html">mapping</a></code></td>
<td>レイアウトマッピング<code>map_</code>を取得する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="mdspan/accessor.html">accessor</a></code></td>
<td>要素アクセサ<code>acc_</code>を取得する</td>
<td>C++23</td>
</tr>
</tbody>
</table>
<h3>レイアウトマッピング</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>is_always_unique()</code></td>
<td><code><a href="LayoutMapping.html">mapping_type::is_always_unique()</a></code></td>
<td>C++23</td>
</tr>
<tr>
<td><code>is_always_exhaustive()</code></td>
<td><code><a href="LayoutMapping.html">mapping_type::is_always_exhaustive()</a></code></td>
<td>C++23</td>
</tr>
<tr>
<td><code>is_always_strided()</code></td>
<td><code><a href="LayoutMapping.html">mapping_type::is_always_strided()</a></code></td>
<td>C++23</td>
</tr>
<tr>
<td><code>is_unique()</code></td>
<td><code><a href="LayoutMapping.html">map_.is_unique()</a></code></td>
<td>C++23</td>
</tr>
<tr>
<td><code>is_exhaustive()</code></td>
<td><code><a href="LayoutMapping.html">map_.is_exhaustive()</a></code></td>
<td>C++23</td>
</tr>
<tr>
<td><code>is_strided()</code></td>
<td><code><a href="LayoutMapping.html">map_.is_strided()</a></code></td>
<td>C++23</td>
</tr>
<tr>
<td><code>stride(rank_type r)</code></td>
<td><code><a href="LayoutMapping.html">map_.stride(r)</a></code></td>
<td>C++23</td>
</tr>
</tbody>
</table>
<h2>メンバ型</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>extents_type</code></td>
<td>多次元配列サイズ型<code><a href="extents.html">Extents</a></code></td>
<td>C++23</td>
</tr>
<tr>
<td><code>layout_type</code></td>
<td><a href="LayoutMappingPolicy.html">レイアウトマッピングポリシー型<code>LayoutPolicy</code></a></td>
<td>C++23</td>
</tr>
<tr>
<td><code>accessor_type</code></td>
<td><a href="AccessorPolicy.html">アクセサポリシー型<code>AccessorPolicy</code></a></td>
<td>C++23</td>
</tr>
<tr>
<td><code>mapping_type</code></td>
<td><a href="LayoutMapping.html">レイアウトマッピング型<code>LayoutPolicy::mapping<Extents></code></a></td>
<td>C++23</td>
</tr>
<tr>
<td><code>element_type</code></td>
<td>要素型<code>ElementType</code></td>
<td>C++23</td>
</tr>
<tr>
<td><code>value_type</code></td>
<td>要素の値型<code><a href="../type_traits/remove_cv.html">remove_cv_t</a><ElementType></code></td>
<td>C++23</td>
</tr>
<tr>
<td><code>size_type</code></td>
<td><code><a href="extents.html">Extents::size_type</a></code></td>
<td>C++23</td>
</tr>
<tr>
<td><code>rank_type</code></td>
<td><code><a href="extents.html">Extents::rank_type</a></code></td>
<td>C++23</td>
</tr>
<tr>
<td><code>pointer</code></td>
<td><code><a href="AccessorPolicy.html">AccessorPolicy::pointer</a></code></td>
<td>C++23</td>
</tr>
<tr>
<td><code>reference</code></td>
<td><code><a href="AccessorPolicy.html">AccessorPolicy::reference</a></code></td>
<td>C++23</td>
</tr>
</tbody>
</table>
<h2>非メンバ（<em>Hidden friends</em>）関数</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="mdspan/swap_free.html">swap</a></code></td>
<td>2つのオブジェクトを入れ替える</td>
<td>C++23</td>
</tr>
</tbody>
</table>
<h2>推論補助</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="mdspan/op_deduction_guide.html">(deduction_guide)</a></code></td>
<td>クラステンプレートの推論補助</td>
<td>C++23</td>
</tr>
</tbody>
</table>
<h2>例</h2>
<p><div class="yata" id="484c9987ac5d4569e42b2653caf51537d67cc8fa"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../mdspan.html"><mdspan></a></span>
<span class="cp">#include <a href="../print.html"><print></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="kt">double</span><span class="w"> </span><span class="n">arr</span><span class="p">[]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="mi">5</span><span class="p">,</span><span class="w"> </span><span class="mi">6</span><span class="p">};</span>
<span class="w"> </span><span class="c1">// メモリブロックに対する2x3要素の2次元配列ビューを作成</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">Ext2x3</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="extents.html">std::extents</a></span><span class="o"><</span><span class="kt">size_t</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="o">></span><span class="p">;</span>
<span class="w"> </span><span class="n"><a href="">std::mdspan</a></span><span class="o"><</span><span class="kt">double</span><span class="p">,</span><span class="w"> </span><span class="n">Ext2x3</span><span class="o">></span><span class="w"> </span><span class="n">mat</span><span class="p">{</span><span class="n">arr</span><span class="p">};</span>
<span class="w"> </span><span class="c1">// 2次元配列の各要素を表示</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">size_t</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">mat</span><span class="p">.</span><span class="n"><a href="mdspan/extent.html">extent</a></span><span class="p">(</span><span class="mi">0</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="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">size_t</span><span class="w"> </span><span class="n">j</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">j</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="n">mat</span><span class="p">.</span><span class="n"><a href="mdspan/extent.html">extent</a></span><span class="p">(</span><span class="mi">1</span><span class="p">);</span><span class="w"> </span><span class="o">++</span><span class="n">j</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">mat</span><span class="p">[</span><span class="n">i</span><span class="p">,</span><span class="w"> </span><span class="n">j</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="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>1 2 3
4 5 6
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++23</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: ??</li>
<li><a href="../../implementation.html#gcc">GCC</a>: ??</li>
<li><a href="../../implementation.html#icc">ICC</a>: ??</li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: ??</li>
</ul>
<h2>関連項目</h2>
<ul>
<li><code><a href="extents.html">extents</a></code></li>
<li><a href="LayoutMappingPolicy.html">LayoutMappingPolicy</a></li>
<li><a href="AccessorPolicy.html">AccessorPolicy</a></li>
<li><a href="../../lang/cpp23/multidimensional_subscript_operator.html">C++23 添字演算子の多次元サポート</a></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p0009r18.html" target="_blank">P0009R18 MDSPAN</a></li>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2599r2.pdf" target="_blank">P2599R2 <code>index_type</code> & <code>size_type</code> in <code>mdspan</code></a></li>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2604r0.html" target="_blank">P2604R0 <code>mdspan</code>: rename <code>pointer</code> and <code>contiguous</code></a></li>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2613r1.html" target="_blank">P2613R1 Add the missing <code>empty</code> to <code>mdspan</code></a></li>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3383r3.html" target="_blank">P3383R3 mdspan.at()</a><ul>
<li>C++26で<code>at</code>メンバ関数を追加</li>
</ul>
</li>
</ul></div>
</div>
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