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最終更新日時(UTC):
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<span itemprop="datePublished" content="2026-01-11T02:45:58">
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2026年01月11日 02時45分58秒
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<span itemprop="name">KaiTomotake</span>
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が更新
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<span class="fa fa-fw fa-clock-o fa-flip-horizontal"></span>履歴
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</a>
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<a class="edit" target="_blank" href="https://github.com/cpprefjp/site/edit/master/reference/stdexcept/invalid_argument.md">
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<span class="fa fa-fw fa-pencil"></span>編集
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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">invalid_argument</span></h1>
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<h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">例</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">invalid_argument</span> <span class="o">:</span> <span class="k">public</span> <span class="n">logic_error</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>関数などにおいて、引数に渡した値が不正であることを示す<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>およびその基底クラスである。
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この<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>は、<code>std::bitset::bitset</code>および<code>std::stoi</code>や<code>std::stof</code>系の関数によってスローされる。</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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<tr>
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<td><code><span href="https://cpprefjp.github.io/reference/stdexcept/invalid_argument/op_constructor.md.nolink">(constructor)</span></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><span href="https://cpprefjp.github.io/reference/stdexcept/invalid_argument/op_destructor.md.nolink">(destructor)</span></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><span href="https://cpprefjp.github.io/reference/stdexcept/invalid_argument/op_assign.md.nolink">operator=</span></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><span href="https://cpprefjp.github.io/reference/stdexcept/exception/what.md.nolink">what</span></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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<p><div class="yata" id="54f62931608ee888f0835e32d98a2d70afe85bd1"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../string.html">&lt;string&gt;</a></span><span class="cp"></span>
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<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">parse_positive_integer</span><span class="p">(</span><span class="k">const</span> <span class="n"><a href="../string/basic_string.html">std::string</a></span><span class="o">&amp;</span> <span class="n">s</span><span class="p">)</span> <span class="p">{</span>
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<span class="kt">int</span> <span class="n">value</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">stoi</span><span class="p">(</span><span class="n">s</span><span class="p">);</span>
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<span class="k">if</span> <span class="p">(</span><span class="n">value</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">"value must be positive"</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">value</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">parse_positive_integer</span><span class="p">(</span><span class="s">"-10"</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">invalid_argument</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="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（標準エラー出力）</h3>
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<p><pre><code>value must be positive
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</code></pre></p></div>
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