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<div class="identifier-type">concept</div><div class="header"><iterator></div><h1 class="exposition-only" itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">dereferenceable</span><span class="cpp cpp20" title="C++20で追加">(C++20)</span><span class="cpp exposition-only" title="説明専用"></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="c1">// 参照修飾を付加する</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">T</span><span class="o">></span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">with</span><span class="o">-</span><span class="n">reference</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">T</span><span class="o">&</span><span class="p">;</span>
<span class="w"> </span><span class="c1">// 参照修飾可能（例えばvoidはこれを満たさない）</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">T</span><span class="o">></span>
<span class="w"> </span><span class="k">concept</span><span class="w"> </span><span class="nc">can</span><span class="o">-</span><span class="n">reference</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">requires</span><span class="w"> </span><span class="p">{</span><span class="w"> </span>
<span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">with</span><span class="o">-</span><span class="n">reference</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">;</span>
<span class="w"> </span><span class="p">};</span>
<span class="w"> </span><span class="c1">// 間接参照可能であり、何らかの結果を返す</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">T</span><span class="o">></span>
<span class="w"> </span><span class="k">concept</span><span class="w"> </span><span class="nc">dereferenceable</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">requires</span><span class="p">(</span><span class="n">T</span><span class="o">&</span><span class="w"> </span><span class="n">t</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="o">*</span><span class="n">t</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">can</span><span class="o">-</span><span class="n">reference</span><span class="p">;</span><span class="w"> </span><span class="c1">// 等しさを保持することを要求しない</span>
<span class="w"> </span><span class="p">};</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>これらの説明専用エンティティは、任意の型が<code>operator*</code>による間接参照が可能であり、何かしらの結果を返すことを表すための最低限のコンセプトとそのためのエイリアステンプレートである。</p>
<p>これらのものは<code><iterator></code>ヘッダ内の他のクラスやコンセプトの定義および説明に使用されるものであり、実際に使用可能ではない。</p>
<h2>参照</h2>
<ul>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0896r4.pdf" target="_blank">P0896R4 The One Ranges Proposal (was Merging the Ranges TS)</a></li>
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