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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">strided_slice</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="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">OffsetType</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">ExtentType</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">StrideType</span><span class="o">></span>
<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">strided_slice</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">offset_type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">OffsetType</span><span class="p">;</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">extent_type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ExtentType</span><span class="p">;</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">stride_type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">StrideType</span><span class="p">;</span>
<span class="w"> </span><span class="p">[[</span><span class="n"><a href="../../lang/cpp20/language_support_for_empty_objects.html">no_unique_address</a></span><span class="p">]]</span><span class="w"> </span><span class="n">offset_type</span><span class="w"> </span><span class="n">offset</span><span class="p">{};</span>
<span class="w"> </span><span class="p">[[</span><span class="n"><a href="../../lang/cpp20/language_support_for_empty_objects.html">no_unique_address</a></span><span class="p">]]</span><span class="w"> </span><span class="n">extent_type</span><span class="w"> </span><span class="n">extent</span><span class="p">{};</span>
<span class="w"> </span><span class="p">[[</span><span class="n"><a href="../../lang/cpp20/language_support_for_empty_objects.html">no_unique_address</a></span><span class="p">]]</span><span class="w"> </span><span class="n">stride_type</span><span class="w"> </span><span class="n">stride</span><span class="p">{};</span>
<span class="w"> </span><span class="p">};</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>strided_slice</code>は、多次元配列の特定次元に対してストライド幅を指定した要素取り出しを指示する集成体クラステンプレートである。</p>
<p>初期化時にメンバ変数名を明記する<a href="../../lang/cpp20/designated_initialization.html">指示付き初期化</a>をサポートし、テンプレートパラメータは<a href="../../lang/cpp20/class_template_argument_deduction_for_aggregates.html">テンプレート引数推論</a>の利用を想定した設計となっている。</p>
<ul>
<li><code>offset</code> : 元の多次元配列におけるオフセット</li>
<li><code>extent</code> : 元の多次元配列における要素数</li>
<li><code>stride</code> : 要素取り出しストライド幅</li>
</ul>
<p><div class="codehilite"><pre><span></span><code><span class="c1">// オフセット=1, 要素数=10, ストライド幅=3</span>
<span class="n">std</span><span class="o">::</span><span class="n">strided_slice</span><span class="p">{.</span><span class="n">offset</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="p">.</span><span class="n">extent</span><span class="o">=</span><span class="mi">10</span><span class="p">,</span><span class="w"> </span><span class="p">.</span><span class="n">stride</span><span class="o">=</span><span class="mi">3</span><span class="p">}</span>
</code></pre></div>
</p>
<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>
<p><code>OffsetType</code>, <code>ExtentType</code>, <code>StrideType</code>は符号付き整数型または符号無し整数型、もしくは<code><a href="../span/integral-constant-like.html">integral-constant-like</a></code>のモデルであること。</p>
<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>offset_type</code></td>
<td><code>offset</code>の型</td>
<td>C++26</td>
</tr>
<tr>
<td><code>extent_type</code></td>
<td><code>extent</code>の型</td>
<td>C++26</td>
</tr>
<tr>
<td><code>stride_type</code></td>
<td><code>stride</code>の型</td>
<td>C++26</td>
</tr>
</tbody>
</table>
<h2>例</h2>
<p><div class="yata" id="21d68cf67f4e76aae4bc074f1b2337f726befa4a"><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="cp">#include <a href="../numeric.html"><numeric></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="c1">// 12要素の1次元配列ビュー</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">arr</span><span class="p">[</span><span class="mi">12</span><span class="p">];</span>
<span class="w"> </span><span class="n"><a href="../numeric/ranges_iota.html">std::ranges::iota</a></span><span class="p">(</span><span class="n">arr</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="mdspan.html">std::mdspan</a></span><span class="w"> </span><span class="n">vec0</span><span class="p">{</span><span class="n">arr</span><span class="p">};</span>
<span class="w"> </span><span class="c1">// オフセット位置1から10要素の範囲よりストライド幅3で要素抽出</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">vec1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="submdspan.html">std::submdspan</a></span><span class="p">(</span><span class="n">vec0</span><span class="p">,</span><span class="w"> </span><span class="n"><span style="color:#ff0000">std::strided_slice</span></span><span class="p">{</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">10</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">});</span>
<span class="w"> </span><span class="c1">// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11</span>
<span class="w"> </span><span class="c1">// ^ . . ^ . . ^ . . ^</span>
<span class="w"> </span><span class="n"><a href="../print/println.html">std::println</a></span><span class="p">(</span><span class="s">"vec1:"</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">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">vec1</span><span class="p">.</span><span class="n">extent</span><span class="p">(</span><span class="mi">0</span><span class="p">);</span><span class="w"> </span><span class="n">i</span><span class="o">++</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">vec1</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">// オフセット位置0から12要素の範囲よりストライド幅4で要素抽出（指示付き初期化を利用）</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">vec2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="submdspan.html">std::submdspan</a></span><span class="p">(</span><span class="n">vec0</span><span class="p">,</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::strided_slice</span></span><span class="p">{.</span><span class="n">offset</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="p">.</span><span class="n">extent</span><span class="o">=</span><span class="mi">12</span><span class="p">,</span><span class="w"> </span><span class="p">.</span><span class="n">stride</span><span class="o">=</span><span class="mi">4</span><span class="p">});</span>
<span class="w"> </span><span class="c1">// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11</span>
<span class="w"> </span><span class="c1">// ^ . . . ^ . . . ^ . . .</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="se">\n</span><span class="s">vec2:"</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">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">vec2</span><span class="p">.</span><span class="n">extent</span><span class="p">(</span><span class="mi">0</span><span class="p">);</span><span class="w"> </span><span class="n">i</span><span class="o">++</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">vec2</span><span class="p">[</span><span class="n">i</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>vec1:
1 4 7 10
vec2:
0 4 8
</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>: ??</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="submdspan.html">submdspan</a></code></li>
<li><a href="../../lang/cpp20/designated_initialization.html">C++20 指示付き初期化</a></li>
<li><a href="../../lang/cpp20/class_template_argument_deduction_for_aggregates.html">C++20 集成体クラステンプレートのテンプレート引数推論</a></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2630r4.html" target="_blank">P2630R4 Submdspan</a></li>
</ul></div>
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