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‎implementation-status.html

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<p class="text-right"><small>
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2024-08-25T22:00:59">
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2024年08月25日 22時00分59秒
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<span itemprop="datePublished" content="2024-09-12T03:40:36">
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2024年09月12日 03時40分36秒
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<td>P0609R3: <span href="https://cpprefjp.github.io/lang/cpp26/attributes_for_structured_bindings.md.nolink">構造化束縛への属性を許可</span></td>
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<td><code>auto [a, [[maybe_unused]] b, c] = f();</code>のように構造化束縛の要素に対して属性を付加できるようにする</td>
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<td>P0609R3: <a href="lang/cpp26/attributes_for_structured_bindings.html">構造化束縛への属性を許可</a></td>
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<td><code>auto [a, b [[maybe_unused]], c] = f();</code>のように構造化束縛の要素に対して属性を付加できるようにする</td>
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‎lang/cpp11/attributes.html

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最終更新日時(UTC):
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<span itemprop="datePublished" content="2024-07-16T09:43:27">
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2024年07月16日 09時43分27秒
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<span itemprop="datePublished" content="2024-09-12T03:40:36">
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span itemprop="name">raclamusi</span>
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<span itemprop="name">Akira Takahashi</span>
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が更新
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</small></p>
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<li><a href="../cpp20/likely_and_unlikely_attributes.html">C++20 <code>[[likely]]</code>, <code>[[unlikely]]</code>属性</a></li>
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<li><a href="../cpp20/reserving_attribute_namespaces_for_future_use.html">C++20 属性の名前空間を予約</a></li>
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<li><a href="../cpp23/attributes_on_lambda_expressions.html">C++23 ラムダ式に対する属性</a></li>
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<li><a href="../cpp26/attributes_for_structured_bindings.html">C++26 構造化束縛への属性を許可</a></li>
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‎lang/cpp17/structured_bindings.html

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<li><a href="../cpp20/relaxing_the_structured_bindings_customization_point_finding_rules.html">C++20 構造化束縛がカスタマイゼーションポイントを見つけるルールを緩和</a></li>
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<li><a href="../cpp20/extending_structured_bindings_to_be_more_like_variable_declarations.html">C++20 構造化束縛を拡張して通常の変数宣言のように使用できるようにする</a></li>
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<li><a href="../cpp20/reference_capture_of_structured_bindings.html">C++20 構造化束縛した変数の参照キャプチャを許可</a></li>
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<li><a href="../cpp26/attributes_for_structured_bindings.html">C++26 構造化束縛への属性を許可</a></li>
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‎lang/cpp26.html

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<td>構文として<a class="cpprefjp-defined-word" data-desc="プログラムが文法規則・診断対象の意味規則・単一定義規則を満たすこと" href="../implementation-compliance.html#dfn-well-formed">適格</a>な属性のみを無視できるようにし、そうでない属性の使用を<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>とする</td>
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<td><span href="https://cpprefjp.github.io/lang/cpp26/attributes_for_structured_bindings.md.nolink">構造化束縛への属性を許可</span></td>
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<td><code>auto [a, [[maybe_unused]] b, c] = f();</code>のように構造化束縛の要素に対して属性を付加できるようにする</td>
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<td><a href="cpp26/attributes_for_structured_bindings.html">構造化束縛への属性を許可</a></td>
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<td><code>auto [a, b [[maybe_unused]], c] = f();</code>のように構造化束縛の要素に対して属性を付加できるようにする</td>
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‎lang/cpp26/attributes_for_structured_bindings.html

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<span itemprop="name">構造化束縛への属性を許可 [P0609R3]</span>
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2024-09-12T03:40:36">
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2024年09月12日 03時40分36秒
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</span>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span itemprop="name">Akira Takahashi</span>
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が更新
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</small></p>
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<a class="history" target="_blank" href="https://github.com/cpprefjp/site/commits/master/lang/cpp26/attributes_for_structured_bindings.md">
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<span class="fa fa-fw fa-clock-o fa-flip-horizontal"></span>履歴
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<a class="edit" target="_blank" href="https://github.com/cpprefjp/site/edit/master/lang/cpp26/attributes_for_structured_bindings.md">
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<span class="fa fa-fw fa-pencil"></span>編集
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<h1 itemprop="name"><span class="token">構造化束縛への属性を許可 [P0609R3]</span><span class="cpp cpp26" title="C++26で追加">(C++26)</span></h1>
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<div itemprop="articleBody"><p></p>
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<p>このページはC++26に採用される見込みの言語機能の変更を解説しています。</p>
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<p>のちのC++規格でさらに変更される場合があるため<a href="#relative-page">関連項目</a>を参照してください。</p>
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<p></p>
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<h2>概要</h2>
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<p>C++26では、構造化束縛の各要素に対して属性を指定できるようになる。</p>
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<p><div class="codehilite"><pre><span></span><code><span class="c1">// 構造化束縛した変数bは使わない</span>
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<span class="k">auto</span> <span class="p">[</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span> <span class="p">[[</span><span class="n">maybe_unused</span><span class="p">]],</span> <span class="n">c</span><span class="p">]</span> <span class="o">=</span> <span class="n">f</span><span class="p">();</span>
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</code></pre></div>
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</p>
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<p>構文としては、構造化束縛の要素となる変数名の後ろに属性を指定する。</p>
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<h2><a href="#relative-page" id="relative-page">関連項目</a></h2>
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<ul>
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<li><a href="../cpp11/attributes.html">C++11 属性構文</a></li>
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<li><a href="../cpp17/structured_bindings.html">C++17 構造化束縛</a></li>
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</ul>
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<h2>参照</h2>
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<ul>
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<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2024/p0609r3.pdf" target="_blank">P0609R3 Attributes for Structured Bindings</a></li>
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‎reference/chrono/make24.html

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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">12h</a></span><span class="p">,</span> <span class="nb">false</span><span class="p">)</span> <span class="o">==</span> <span class="n"><a href="duration/op_h.html">0h</a></span><span class="p">);</span>
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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">12h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="n"><a href="duration/op_h.html">12h</a></span><span class="p">);</span>
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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">1h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="n"><a href="duration/op_h.html">3h</a></span><span class="p">);</span>
242+
<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">1h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1u</span><span class="n">TqSFlfSSPapLrvFszILJIAtKtfawzlb</span><span class="p">);</span>
243243
<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">3h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="n"><a href="duration/op_h.html">15h</a></span><span class="p">);</span>
244244
<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">11h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="n"><a href="duration/op_h.html">23h</a></span><span class="p">);</span>
245245
<span class="p">}</span>

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