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lang/cpp20/deprecate_array_comparisons.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="2025-04-24T05:11:38">
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2025年04月24日 05時11分38秒
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<span itemprop="datePublished" content="2025-09-03T15:04:45">
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2025年09月03日 15時04分45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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<span itemprop="name">ACUVE</span>
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</span>
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が更新
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</small></p>
@@ -222,7 +222,7 @@ <h2>概要</h2>
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<p>組み込み配列同士の三方比較は<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>である。</p>
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<p><div class="codehilite"><pre><span></span><code><span class="kt">int</span> <span class="n">arr1</span><span class="p">[</span><span class="mi">5</span><span class="p">];</span>
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<span class="kt">int</span> <span class="n">arr2</span><span class="p">[</span><span class="mi">5</span><span class="p">];</span>
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<span class="kt">bool</span> <span class="n">same</span> <span class="o">=</span> <span class="n">arr1</span> <span class="o">==</span> <span class="n">arr2</span><span class="p">;</span> <span class="c1">// C++20で非推奨。&amp;arr[0] == &amp;arr[1]と同じ。</span>
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<span class="kt">bool</span> <span class="n">same</span> <span class="o">=</span> <span class="n">arr1</span> <span class="o">==</span> <span class="n">arr2</span><span class="p">;</span> <span class="c1">// C++20で非推奨。&amp;arr1[0] == &amp;arr2[0]と同じ。</span>
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<span class="c1">// 配列の要素は比較されない</span>
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<span class="k">auto</span> <span class="n">cmp</span> <span class="o">=</span> <span class="n">arr1</span> <span class="o">&lt;=&gt;</span> <span class="n">arr2</span><span class="p">;</span> <span class="c1">// エラー!</span>
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</code></pre></div>

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