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2024年06月11日 13時45分38秒
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<div class="identifier-type">class template</div><div class="header"><tuple></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">common_type</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="n"><a href="../tuple-like.html">tuple-like</a></span><span class="w"> </span><span class="n">TTuple</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../tuple-like.html">tuple-like</a></span><span class="w"> </span><span class="n">UTuple</span><span class="o">></span>
<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc"><a href="../../type_traits/common_type.html">common_type</a></span><span class="o"><</span><span class="n">TTuple</span><span class="p">,</span><span class="w"> </span><span class="n">UTuple</span><span class="o">></span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code><a href="../tuple.html">tuple</a></code>と<code><a href="../tuple-like.html">tuple-like</a></code>なオブジェクについて、どちらからも変換可能な共通の型を取得できるようにする<code><a href="../../type_traits/common_type.html">common_type</a></code>の特殊化である。</p>
<h2>効果</h2>
<p><code><a href="../tuple.html">tuple</a><<a href="../../type_traits/common_type.html">common_type_t</a><TTypes, UTypes>...></code>によって得られた型をメンバ型<code>type</code>として定義する。</p>
<h2>備考</h2>
<ul>
<li><code>TTuple</code>か<code>UTuple</code>のどちらかが<code><a href="../tuple.html">tuple</a></code>の特殊化であること。</li>
<li><code>TTuple</code>と<code>UTuple</code>のそれぞれについて、（次の<code>T</code>を置き換える形で）<code><a href="../../type_traits/is_same.html">is_same_v</a><T, <a href="../../type_traits/decay.html">decay_t</a><T>></code>であること。<ul>
<li>実質的には<code>TTuple</code>と<code>Utuple</code>について、参照型ではなく、最上位の<code>const</code>/<code>volatile</code>修飾も持っていないこと要求する。</li>
</ul>
</li>
<li><code>TTuple</code>と<code>UTuple</code>の要素数が一致していること。<ul>
<li>具体的には、<code><a href="../tuple_size.html">tuple_size_v</a><TTuple> == <a href="../tuple_size.html">tuple_size_v</a><UTuple></code>であること。</li>
</ul>
</li>
<li><code><a href="../tuple.html">tuple</a><<a href="../../type_traits/common_type.html">common_type_t</a><TTypes, UTypes>...></code>が正しく型を表すこと。</li>
</ul>
<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>: 3.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../../implementation.html#gcc">GCC</a>: 4.6.1 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../../implementation.html#visual_cpp">Visual C++</a>: 2012 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
</ul>
<h2>関連項目</h2>
<ul>
<li><a href="../../type_traits/common_type.html">common_type</a></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2165r4.pdf" target="_blank">P2165R4 Compatibility between <code>tuple</code>, <code>pair</code> and <em>tuple-like</em> objects</a></li>
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