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<div class="identifier-type">function template</div><div class="header"><exception></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">throw_with_nested</span><span class="cpp cpp11" title="C++11で追加">(C++11)</span></h1>
<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span><span class="w"> </span><span class="nn">std</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span>
<span class="w"> </span><span class="p">[[</span><span class="n">noreturn</span><span class="p">]]</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="n">throw_with_nested</span><span class="p">(</span><span class="n">T</span><span class="o">&&</span><span class="w"> </span><span class="n">t</span><span class="p">);</span><span class="w"> </span><span class="c1">// (1) C++11</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>現在処理中の<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>を入れ子にした<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>を送出する</p>
<h2><a class="cpprefjp-defined-word" data-desc="関数等の意味論を構成する要素の1つ。Preconditions。関数呼び出し時に満たされていると関数が想定する条件。満たさなければ未定義の動作。契約属性の`[[expects]]`に相当">事前条件</a></h2>
<p><code>U</code>を <code><a href="../type_traits/decay.html">decay_t</a><T></code> として、型<code>U</code>がコピー構築可能(<em>Cpp17CopyConstructible</em>)の要件を満たすこと。</p>
<h2><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></h2>
<p><code>U</code>を <code><a href="../type_traits/decay.html">decay_t</a><T></code> とする。</p>
<ul>
<li><code><a href="../type_traits/is_class.html">is_class_v</a><U> && !<a href="../type_traits/is_final.html">is_final_v</a><U> && !<a href="../type_traits/is_base_of.html">is_base_of_v</a><<a href="nested_exception.html">nested_exception</a>, U></code>が<code>true</code>である場合、<code>U</code>と<code><a href="nested_exception.html">nested_exception</a></code>の両方からpublic派生した<a class="cpprefjp-defined-word" data-desc="未規定の動作。事前の断りなく処理系によって異なる動作をする" href="../../implementation-compliance.html#dfn-unspecified-behavior">未規定</a>の型のオブジェクトを、<code>std::<a href="../utility/forward.html">forward</a><T>(t)</code>から構築して送出する。</li>
<li>そうでない場合、<code>std::<a href="../utility/forward.html">forward</a><T>(t)</code>を送出する。</li>
</ul>
<h2><a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価結果となるオブジェクト・値">戻り値</a></h2>
<p>この関数は決して返らない</p>
<h2>例</h2>
<p><div class="yata" id="9b81935de242a245f93c08b59a66d77202e90d7d"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../exception.html"><exception></a></span>
<span class="cp">#include <a href="../memory.html"><memory></a></span>
<span class="k">struct</span><span class="w"> </span><span class="nc">inner_error</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="n"><a href="exception.html">std::exception</a></span><span class="w"> </span><span class="p">{};</span>
<span class="k">struct</span><span class="w"> </span><span class="nc">outer_error</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="n"><a href="nested_exception.html">std::nested_exception</a></span><span class="w"> </span><span class="p">{};</span>
<span class="c1">// 現在の例外を取得</span>
<span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span>
<span class="n"><a href="../memory/shared_ptr.html">std::shared_ptr</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">get_exception</span><span class="p">(</span><span class="n"><a href="exception_ptr.html">std::exception_ptr</a></span><span class="w"> </span><span class="n">ep</span><span class="p">)</span>
<span class="p">{</span>
<span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">rethrow_exception</span><span class="p">(</span><span class="n">ep</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="o">&</span><span class="w"> </span><span class="n">e</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n"><a href="../memory/shared_ptr.html">std::shared_ptr</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">(</span><span class="k">new</span><span class="w"> </span><span class="n">T</span><span class="p">(</span><span class="n">e</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(...)</span><span class="w"> </span><span class="p">{}</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nb">nullptr</span><span class="p">;</span>
<span class="p">}</span>
<span class="c1">// 入れ子になってる例外を取得</span>
<span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span>
<span class="n"><a href="../memory/shared_ptr.html">std::shared_ptr</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">get_nested_exception</span><span class="p">(</span><span class="n"><a href="nested_exception.html">std::nested_exception</a></span><span class="o">&</span><span class="w"> </span><span class="n">ex</span><span class="p">)</span>
<span class="p">{</span>
<span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="rethrow_if_nested.html">std::rethrow_if_nested</a></span><span class="p">(</span><span class="n">ex</span><span class="p">);</span><span class="w"> </span><span class="c1">// 入れ子になってる例外を送出</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(</span><span class="n">T</span><span class="o">&</span><span class="w"> </span><span class="n">e</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n"><a href="../memory/shared_ptr.html">std::shared_ptr</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">(</span><span class="k">new</span><span class="w"> </span><span class="n">T</span><span class="p">(</span><span class="n">e</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(...)</span><span class="w"> </span><span class="p">{}</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nb">nullptr</span><span class="p">;</span>
<span class="p">}</span>
<span class="kt">int</span><span class="w"> </span><span class="n">main</span><span class="p">()</span>
<span class="p">{</span>
<span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">throw</span><span class="w"> </span><span class="n">inner_error</span><span class="p">();</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(...)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="c1">// inner_errorを入れ子にしてouter_errorを送出</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::throw_with_nested</span></span><span class="p">(</span><span class="n">outer_error</span><span class="p">());</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(...)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="c1">// 外側の例外を取得</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n"><a href="../memory/shared_ptr.html">std::shared_ptr</a></span><span class="o"><</span><span class="n">outer_error</span><span class="o">></span><span class="w"> </span><span class="n">outer</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">get_exception</span><span class="o"><</span><span class="n">outer_error</span><span class="o">></span><span class="p">(</span><span class="n"><a href="current_exception.html">std::current_exception()</a></span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"outer"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="c1">// 入れ子になった例外を取得</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n"><a href="../memory/shared_ptr.html">std::shared_ptr</a></span><span class="o"><</span><span class="n">inner_error</span><span class="o">></span><span class="w"> </span><span class="n">inner</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">get_nested_exception</span><span class="o"><</span><span class="n">inner_error</span><span class="o">></span><span class="p">(</span><span class="o">*</span><span class="n">outer</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"inner"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>outer
inner
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++11</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: 9.0.1 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#gcc">GCC</a>: 4.7.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2015 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
</ul>
<h2>関連項目</h2>
<ul>
<li><a href="../../lang/cpp26/allowing_exception_throwing_in_constant-evaluation.html">C++26 定数評価での例外送出を許可</a></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2026/p3842r2.pdf" target="_blank">P3842R2 A conservative fix for constexpr <code>uncaught_exceptions()</code> and <code>current_exception()</code></a><ul>
<li>C++26の策定中に<code>constexpr</code>が追加されたが、本提案文書により巻き戻された (C++29で再検討予定)</li>
</ul>
</li>
<li><a href="https://cplusplus.github.io/LWG/issue1066" target="_blank">LWG Issue 1066. Use <code>[[noreturn]]</code> attribute in the library</a><ul>
<li>C++11で、呼び出し元へ戻らない標準ライブラリ関数に<code>[[noreturn]]</code>属性が付加された</li>
</ul>
</li>
<li><a href="https://cplusplus.github.io/LWG/issue1370" target="_blank">LWG Issue 1370. <code>throw_with_nested</code> should not use perfect forwarding</a><ul>
<li>C++11で、要件と送出される<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>の型の判定が<code>T</code>ではなく<code><a href="../type_traits/remove_reference.html">remove_reference</a><T>::type</code>に対して行われるよう改められた。完全転送のために<code>T</code>が参照型となりうるため</li>
</ul>
</li>
<li><a href="https://cplusplus.github.io/LWG/issue2483" target="_blank">LWG Issue 2483. <code>throw_with_nested()</code> should use <code>is_final</code></a><ul>
<li>ラップするかどうかの判定に<code><a href="../type_traits/is_final.html">is_final</a></code>による条件が追加され、<code>final</code>指定されたクラスも引数に取れるようになった</li>
<li>この修正は欠陥報告(DR)であり、C++11以降に遡及して適用される。<code>final</code>指定されたクラスから派生した型を送出するという元の規定は実装不可能であり、処理系は当初から派生させずにそのまま送出していたため、これと異なる観測可能な挙動が出荷されていたわけではない</li>
</ul>
</li>
<li><a href="https://cplusplus.github.io/LWG/issue2855" target="_blank">LWG Issue 2855. <code>std::throw_with_nested("string_literal")</code></a><ul>
<li>判定に<code><a href="../type_traits/decay.html">decay_t</a><T></code>を用いるよう変更され、文字列リテラルや関数など(配列型・関数型)を渡せることが明確化された</li>
<li>この修正は欠陥報告(DR)であり、C++11以降に遡及して適用される。配列型・関数型を排除していた元の要件は文言上の欠陥であり、処理系は当初から<code>decay</code>後の型で動作していたため</li>
</ul>
</li>
</ul></div>
</div>
</div>
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