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<div class="identifier-type">class template</div><div class="header"><compare></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">type_order</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="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">U</span><span class="o">></span>
<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">type_order</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">static</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n"><a href="strong_ordering.html">strong_ordering</a></span><span class="w"> </span><span class="n">value</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">TYPE</span><span class="o">-</span><span class="n">ORDER</span><span class="p">(</span><span class="n">T</span><span class="p">,</span><span class="w"> </span><span class="n">U</span><span class="p">);</span><span class="w"> </span><span class="c1">// 説明専用</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">value_type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="strong_ordering.html">strong_ordering</a></span><span class="p">;</span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">operator</span><span class="w"> </span><span class="n">value_type</span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">noexcept</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">value</span><span class="p">;</span><span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n">value_type</span><span class="w"> </span><span class="k">operator</span><span class="p">()()</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">noexcept</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">value</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="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">U</span><span class="o">></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n"><a href="strong_ordering.html">strong_ordering</a></span><span class="w"> </span><span class="n">type_order_v</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">type_order</span><span class="o"><</span><span class="n">T</span><span class="p">,</span><span class="w"> </span><span class="n">U</span><span class="o">>::</span><span class="n">value</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>2つの型<code>T</code>と<code>U</code>の間の、コンパイル時の全順序を取得する。</p>
<p>これを使用することにより、型リストの正規化（例えば<code>typeset<A, B></code>と<code>typeset<B, A></code>を同じ型として扱う）や、複数の翻訳単位にわたって型の順序を一貫させることができる。</p>
<h2>効果</h2>
<p><code>TYPE-ORDER(T, U)</code>は<a class="cpprefjp-defined-word" data-desc="処理系定義の動作。処理系によって事前に定めた動作をする" href="../../implementation-compliance.html#dfn-implementation-defined-behavior">実装定義</a>であり、すべての型に対する全順序を表す。以下の保証がある：</p>
<ul>
<li>反射律: <code>type_order_v<T, T></code>は<code><a href="strong_ordering.html">strong_ordering::equal</a></code></li>
<li>反対称律: <code>type_order_v<T, U></code>が<code>less</code>であれば、<code>type_order_v<U, T></code>は<code>greater</code></li>
<li>推移律: 通常の推移性</li>
<li><a class="cpprefjp-defined-word" data-desc="型をconstおよび・もしくはvolatileで修飾すること">CV修飾</a>や参照修飾の異なる型は別個の型として区別される（例: <code>int</code>、<code>const int</code>、<code>int&</code>は順序として<code>equal</code>ではない）</li>
</ul>
<p>実装は、型の同名異シグニチャ化に使用される既存のABIマングリング基盤を利用することが想定される。実装は推奨事項として、テンプレートの第i引数のみが異なる場合に、<code>X<...,T,...></code>と<code>X<...,U,...></code>の順序が<code>T</code>と<code>U</code>の順序と一致するように再帰的な一貫性を提供することができる。</p>
<h2>備考</h2>
<ul>
<li>C++26より前は、型の全順序を得るためには<code>__PRETTY_FUNCTION__</code>等の処理系固有の機能を使うか、<code>typeid</code>を実行時に比較する必要があった。<code>type_order</code>は、コンパイル時に取得できる、<a class="cpprefjp-defined-word" data-desc="処理系定義の動作。処理系によって事前に定めた動作をする" href="../../implementation-compliance.html#dfn-implementation-defined-behavior">実装定義</a>であるが安定した型の全順序を提供する</li>
<li>このクラスは<a class="cpprefjp-defined-word" data-desc="型のサイズを決定できない、完全には定義されていない型。例えば先行宣言のみのクラス型、要素数不明の配列型、`void`など。クラス定義内部ではそのクラス自身は不完全型">不完全型</a>に対しても動作する</li>
<li><a class="cpprefjp-defined-word" data-desc="処理系定義の動作。処理系によって事前に定めた動作をする" href="../../implementation-compliance.html#dfn-implementation-defined-behavior">実装定義</a>の全順序の具体的な順番には依存すべきではないが、同じ実装のなかでは翻訳単位の境界をまたいでも安定する</li>
<li><code>type_order</code>をユーザーが明示的に特殊化・部分特殊化することは禁止されている。そのような宣言を行った場合、プログラムは<a class="cpprefjp-defined-word" data-desc="プログラムが適格でないこと。コンパイルエラーなどになる" href="../../implementation-compliance.html#dfn-ill-formed">不適格</a>となる</li>
</ul>
<h2>例</h2>
<p><div class="yata" id="4351170e38401383b45125ca5f81d47fcb1d43a3"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../compare.html"><compare></a></span>
<span class="cp">#include <a href="../type_traits.html"><type_traits></a></span>
<span class="k">struct</span><span class="w"> </span><span class="nc">A</span><span class="w"> </span><span class="p">{};</span>
<span class="k">struct</span><span class="w"> </span><span class="nc">B</span><span class="w"> </span><span class="p">{};</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="c1">// 同じ型同士の比較はequal</span>
<span class="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">type_order_v</span><span class="o"><</span><span class="kt">int</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n"><a href="strong_ordering.html">strong_ordering</a></span><span class="o">::</span><span class="n">equal</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// 異なる型同士の順序は実装定義だが、反対称性は保証される</span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">ord_ab</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">type_order_v</span><span class="o"><</span><span class="n">A</span><span class="p">,</span><span class="w"> </span><span class="n">B</span><span class="o">></span><span class="p">;</span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">ord_ba</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">type_order_v</span><span class="o"><</span><span class="n">B</span><span class="p">,</span><span class="w"> </span><span class="n">A</span><span class="o">></span><span class="p">;</span>
<span class="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n">ord_ab</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n"><a href="strong_ordering.html">strong_ordering</a></span><span class="o">::</span><span class="n">equal</span><span class="p">);</span>
<span class="w"> </span><span class="k">static_assert</span><span class="p">((</span><span class="n">ord_ab</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="o">==</span><span class="w"> </span><span class="p">(</span><span class="n">ord_ba</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="k">static_assert</span><span class="p">((</span><span class="n">ord_ab</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="o">==</span><span class="w"> </span><span class="p">(</span><span class="n">ord_ba</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="c1">// CV修飾の違いも区別される</span>
<span class="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">type_order_v</span><span class="o"><</span><span class="kt">int</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n"><a href="strong_ordering.html">strong_ordering</a></span><span class="o">::</span><span class="n">equal</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code></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>: 22 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
<li><a href="../../implementation.html#gcc">GCC</a>: 16 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2026 Update 2 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
</ul>
<h2>関連項目</h2>
<ul>
<li><code><a href="strong_ordering.html">strong_ordering</a></code></li>
<li><code><a href="../meta/type_order.html">std::meta::type_order</a></code></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p2830r10.html" target="_blank">P2830R10 Constexpr Type Ordering</a></li>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3778r0.html" target="_blank">P3778R0 Fix for <code>type_order</code> template definition</a></li>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2026/p4140r0.html" target="_blank">P4140R0 Proposed resolution for US70-126: allow incomplete types in <code>type_order</code></a></li>
<li><a href="https://cplusplus.github.io/LWG/issue4305" target="_blank">LWG Issue 4305. Missing user requirements on <code>type_order</code> template</a><ul>
<li>C++26で、ユーザーが<code>type_order</code>の明示的特殊化・部分特殊化を宣言するとプログラムが<a class="cpprefjp-defined-word" data-desc="プログラムが適格でないこと。コンパイルエラーなどになる" href="../../implementation-compliance.html#dfn-ill-formed">不適格</a>となることが規定された</li>
</ul>
</li>
</ul></div>
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