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‎reference/stdexcept.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="2025-07-29T05:44:02">
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2025年07月29日 05時44分02秒
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<span itemprop="datePublished" content="2026-01-05T02:22:56">
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2026年01月05日 02時22分56秒
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<span itemprop="name">Raclamusi</span>
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<span itemprop="name">KaiTomotake</span>
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が更新
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</small></p>
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</thead>
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<tbody>
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<td><code>logic_error</code></td>
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<td><code><a href="stdexcept/logic_error.html">logic_error</a></code></td>
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<td>プログラムの実行前に検出可能なエラー（論理エラー）を示す</td>
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<td></td>
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<p><a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a>クラスには継承関係があり、以下の箇条書きの階層構造で示す。</p>
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<ul>
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<li><code><a href="exception/exception.html">exception</a></code><ul>
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<li><code>logic_error</code><ul>
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<li><code><a href="stdexcept/logic_error.html">logic_error</a></code><ul>
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<li><code>domain_error</code></li>
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<li><code>invalid_argument</code></li>
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<li><code>length_error</code></li>

‎reference/stdexcept/logic_error.html‎

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<div class="identifier-type">class</div><div class="header">&lt;stdexcept&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">logic_error</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span> <span class="n">std</span> <span class="p">{</span>
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<span class="k">class</span> <span class="nc">logic_error</span> <span class="o">:</span> <span class="k">public</span> <span class="n">exception</span><span class="p">;</span>
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<span class="p">}</span>
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</code></pre></div>
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</p>
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<h2>概要</h2>
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<p><code>logic_error</code>クラスはプログラムの実行前に検出可能なエラー（論理エラー）を通知するためにスローされる<a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a>クラス全般に対する基底クラスである。</p>
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<h2>メンバ関数</h2>
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<table border="1" bordercolor="#888" style="border-collapse:collapse">
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<thead>
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<tr>
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<th>名前</th>
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<th>説明</th>
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<th>対応バージョン</th>
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</tr>
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</thead>
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<tbody>
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<td><code>(constructor)</code></td>
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<td>コンストラクタ</td>
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<td></td>
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</tr>
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<tr>
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<td><code>(destructor)</code></td>
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<td>デストラクタ</td>
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<td></td>
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</tr>
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<tr>
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<td><code>operator=</code></td>
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<td>代入演算子</td>
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<td></td>
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</tr>
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<tr>
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<td><code>what</code></td>
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<td>エラー理由を取得する</td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<h2>例</h2>
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<p><div class="yata" id="b260cab350b5b8bbbb7a9484821f0ab05030f66e"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../stdexcept.html">&lt;stdexcept&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../iostream.html">&lt;iostream&gt;</a></span><span class="cp"></span>
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<span class="kt">int</span> <span class="nf">square_root</span><span class="p">(</span><span class="kt">int</span> <span class="n">num</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">if</span> <span class="p">(</span><span class="n">num</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">throw</span> <span class="n">std</span><span class="o">::</span><span class="n">invalid_argument</span><span class="p">(</span><span class="s">"Cannot perform calculations with negative numbers!"</span><span class="p">)</span>
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<span class="p">}</span>
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<span class="k">return</span> <span class="n">num</span> <span class="o">*</span> <span class="n">num</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
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<span class="k">try</span> <span class="p">{</span>
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<span class="n">square_root</span><span class="p">(</span><span class="o">-</span><span class="mi">5</span><span class="p">);</span>
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<span class="p">}</span> <span class="k">catch</span> <span class="p">(</span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">logic_error</span><span class="o">&amp;</span> <span class="n">e</span><span class="p">)</span> <span class="p">{</span>
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<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">"Error: "</span> <span class="o">&lt;&lt;</span> <span class="n">e</span><span class="p">.</span><span class="n">what</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="p">}</span>
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</code></pre></div>
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</div></p>
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<h3>出力</h3>
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<p><pre><code></code></pre></p></div>
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