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‎lang/cpp29/feature_test_macros.html‎

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<p class="text-right"><small>
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最終更新日時:
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<time itemprop="datePublished" class="js-local-time"
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datetime="2026-09-08T15:10:34+09:00">
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2026年09月08日 15時10分34秒 (JST)
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2026年09月14日 13時07分06秒 (JST)
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</thead>
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<tr>
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<td><code>__cpp_lib_bitops</code></td>
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<td><code>202606L</code></td>
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<td><code><a href="../../reference/bit.html">&lt;bit&gt;</a></code>に、シフト量が負であってもビット幅以上であっても<a class="cpprefjp-defined-word" data-desc="未定義の動作。処理系は予期せぬ動作をする可能性がある。要するに動作保証対象外。undefined behavior (UB)。" href="../../implementation-compliance.html#dfn-undefined-behavior">未定義動作</a>にならないシフト<code><a href="../../reference/bit/shl.html">std::shl()</a></code>・<code><a href="../../reference/bit/shr.html">std::shr()</a></code>関数を追加</td>
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<td><code><a href="../../reference/bit.html">&lt;bit&gt;</a></code></td>
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</tr>
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<tr>
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<td><code>__cpp_lib_expected</code></td>
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<td><code>202606L</code></td>
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<td><code><a href="../../reference/expected/expected.html">std::expected</a></code>に、エラー値を保持しているかを判定する<code><a href="../../reference/expected/expected/has_error.html">has_error()</a></code>メンバ関数を追加</td>
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</ul>
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</li>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2026/p3793r2.html" target="_blank">P3793R2 Better shifting</a><ul>
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<li>C++29で<code>__cpp_lib_bitops</code>が<code>202606L</code>に更新された</li>
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<li>C++29で<code>__cpp_lib_simd_bitops</code>が追加された</li>
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</ul>
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‎reference/bit/shl.html‎

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2026年07月31日 23時18分35秒 (JST)
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2026年09月14日 13時07分06秒 (JST)
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<h3>処理系</h3>
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<ul>
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<li><a href="../../implementation.html#clang">Clang</a>: 22 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
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<li><a href="../../implementation.html#gcc">GCC</a>: 16.1 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
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<li><a href="../../implementation.html#gcc">GCC</a>: 17 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
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<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>
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</ul>
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<h2>関連項目</h2>
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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://www.open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3793r1.html" target="_blank">P3793R1 Better shifting</a><ul>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2026/p3793r2.html" target="_blank">P3793R2 Better shifting</a><ul>
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<li>C++29で追加された</li>
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</ul>
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‎reference/bit/shr.html‎

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2026年07月31日 23時18分35秒 (JST)
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2026年09月14日 13時07分06秒 (JST)
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<h3>処理系</h3>
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<ul>
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<li><a href="../../implementation.html#clang">Clang</a>: 22 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
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<li><a href="../../implementation.html#gcc">GCC</a>: 16.1 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
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<li><a href="../../implementation.html#gcc">GCC</a>: 17 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
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<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>
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<h2>関連項目</h2>
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<h2>参照</h2>
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<ul>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3793r1.html" target="_blank">P3793R1 Better shifting</a><ul>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2026/p3793r2.html" target="_blank">P3793R2 Better shifting</a><ul>
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<li>C++29で追加された</li>
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‎reference/chrono/make24.html‎

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<span class="w"> </span><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="w"> </span><span class="nb">false</span><span class="p">)</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n"><a href="duration/op_h.html">0h</a></span><span class="p">);</span>
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<span class="w"> </span><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="w"> </span><span class="nb">true</span><span class="p">)</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n"><a href="duration/op_h.html">12h</a></span><span class="p">);</span>
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<span class="w"> </span><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="w"> </span><span class="nb">true</span><span class="p">)</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mf">1f</span><span class="n">cGOTDYszTiHbZcwwazKXsSnaLvsvhpw</span><span class="p">);</span>
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<span class="w"> </span><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="w"> </span><span class="nb">true</span><span class="p">)</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">1</span><span class="n"><a href="duration/op_h.html">3h</a></span><span class="p">);</span>
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<span class="w"> </span><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="w"> </span><span class="nb">true</span><span class="p">)</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n"><a href="duration/op_h.html">15h</a></span><span class="p">);</span>
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<span class="w"> </span><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="w"> </span><span class="nb">true</span><span class="p">)</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n"><a href="duration/op_h.html">23h</a></span><span class="p">);</span>
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‎reference/simd/shl.html‎

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<h2>参照</h2>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2026/p3793r2.html" target="_blank">P3793R2 Better shifting</a><ul>
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<li>C++29で<code>&lt;bit&gt;</code>ヘッダにスカラー版、<code>&lt;simd&gt;</code>ヘッダに<code>std::simd</code>版の<code>shl</code>が追加された</li>
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‎reference/simd/shr.html‎

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2026年09月14日 13時07分06秒 (JST)
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2026/p3793r2.html" target="_blank">P3793R2 Better shifting</a><ul>
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<li>C++29で<code>&lt;bit&gt;</code>ヘッダにスカラー版、<code>&lt;simd&gt;</code>ヘッダに<code>std::simd</code>版の<code>shr</code>が追加された</li>
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