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最終更新日時(UTC):
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2025年07月08日 15時33分39秒
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<div class="identifier-type">customization point object</div><div class="header"><ranges></div><h1 itemprop="name"><span class="namespace" title="namespace std::ranges::views">std::ranges::views::</span><span class="token">all</span><span class="cpp cpp20" title="C++20で追加">(C++20)</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">ranges</span><span class="o">::</span><span class="nn">views</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="cm">/*unspecified*/</span><span class="w"> </span><span class="n">all</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="cm">/*unspecified*/</span><span class="p">;</span><span class="w"> </span><span class="c1">// (1)</span>
<span class="w"> </span><span class="k">template</span><span class="o"><</span><span class="n"><a href="viewable_range.html">viewable_range</a></span><span class="w"> </span><span class="n">R</span><span class="o">></span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n"><a href="">all_t</a></span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">decltype</span><span class="p">(</span><span class="n">all</span><span class="p">(</span><span class="n"><a href="../utility/declval.html">declval</a></span><span class="o"><</span><span class="n">R</span><span class="o">></span><span class="p">()));</span><span class="w"> </span><span class="c1">// (2)</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<ul>
<li>(1): Rangeへの参照として振る舞う<code><a href="view.html">view</a></code>を生成するRangeアダプタクロージャオブジェクト</li>
<li>(2): <code>all</code>の<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>の型を得るエイリアステンプレート</li>
</ul>
<p><code>all</code>は、元のRange全体を表す<code><a href="view.html">view</a></code>。これは、<code><a href="view.html">view</a></code>ではないRangeを<code><a href="view.html">view</a></code>として扱うために利用できる。
Rangeアダプタオブジェクトでも暗黙的に使用され、それにより<code><a href="view.html">view</a></code>かどうかを気にせず使えるようになっている。</p>
<p><code>all</code>が生成する<code>view</code>をまとめて"all view"という。<code>all_t</code>を使えば、<code>all</code>の型を得ることができる。</p>
<h2>効果</h2>
<p>式<code>views::all(E)</code>の効果は次の通り</p>
<ul>
<li><code>E</code>の<code><a href="../type_traits/decay.html">decay</a></code>した型が<code><a href="view.html">view</a></code>のモデルであれば、<code><a href="../exposition-only/decay-copy.html">decay-copy</a>(E)</code>と等しい</li>
<li>それ以外のとき、<code><a href="ref_view.html">ref_view</a>{E}</code>が有効な式であれば、<code><a href="ref_view.html">ref_view</a>{E}</code>と等しい</li>
<li>それ以外のとき、<code><a href="owning_view.html">owning_view</a>{E}</code>と等しい</li>
</ul>
<h2>例</h2>
<p><div class="yata" id="6af100f6f144aec7363f3590da4afb58cbd5a966"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../ranges.html"><ranges></a></span>
<span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="k">namespace</span><span class="w"> </span><span class="nn">std</span><span class="p">;</span>
<span class="w"> </span><span class="kt">int</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="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="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="n">a</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n"><span style="color:#ff0000">views::all</span></span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </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>12345
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++20</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: 13.0.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#gcc">GCC</a>: 10.1.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#icc">ICC</a>: ?</li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2019 Update 10 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://timsong-cpp.github.io/cppwp/ranges" target="_blank">N4892 24 Ranges library</a></li>
<li><a href="https://techbookfest.org/product/5134506308665344" target="_blank">C++20 ranges</a></li>
<li><a href="https://zenn.dev/onihusube/articles/fd07528b68ae0c" target="_blank">［C++］ <code><ranges></code>のviewを見る19 - owning_view</a></li>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2415r2.html" target="_blank">P2415R2 What is a <code>view</code>?</a> (本提案文書はC++20に遡って適用されている)</li>
</ul></div>
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