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最終更新日時(UTC):
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2024年06月11日 13時45分38秒
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<div class="identifier-type">function</div><div class="header"><stacktrace></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="class" title="class stacktrace_entry">stacktrace_entry::</span><span class="token">source_line</span><span class="cpp cpp23" title="C++23で追加">(C++23)</span></h1>
<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="n"><a href="../../cstdint/uint_least32_t.html">uint_least32_t</a></span><span class="w"> </span><span class="nf">source_line</span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="p">;</span><span class="w"> </span><span class="c1">// (1) C++23</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>行番号を取得する。</p>
<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><code>*this</code>で表される評価に字句的に関連する<code>0</code>または<code>1</code>ベースの行番号を返す。</p>
<p><code><a href="source_file.html">source_file()</a></code>が推定のソースファイル名を返す場合は推定の行番号を返し、<code><a href="source_file.html">source_file</a></code>が実際のソースファイル名を返す場合は実際の行番号を返す。</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>内部のデータ構造のメモリ確保ができない場合、<code><a href="../../new/bad_alloc.html">std::bad_alloc</a></code><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>備考</h2>
<ul>
<li>この関数はメモリ確保以外のエラーを「利用可能な情報がない」ものとして扱い、その場合は<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>を送出しない</li>
</ul>
<h2>例</h2>
<p><div class="yata" id="50733374c66e5c84f027ca133de8ac8902b00481"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../../stacktrace.html"><stacktrace></a></span>
<span class="kt">void</span><span class="w"> </span><span class="nf">g</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../basic_stacktrace.html">std::stacktrace</a></span><span class="w"> </span><span class="n">st</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../basic_stacktrace.html">std::stacktrace</a></span><span class="o">::</span><span class="n"><a href="../basic_stacktrace/current.html">current</a></span><span class="p">();</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">stacktrace_entry</span><span class="w"> </span><span class="n">entry</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">st</span><span class="p">[</span><span class="mi">0</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="n"><span style="color:#ff0000">entry.source_line()</span></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="p">}</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">f</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">g</span><span class="p">();</span>
<span class="p">}</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">f</span><span class="p">();</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力例 (GCC)</h3>
<p><pre><code>5
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++23</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../../implementation.html#clang">Clang</a>: ??</li>
<li><a href="../../../implementation.html#gcc">GCC</a>: 12 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../../implementation.html#visual_cpp">Visual C++</a>: ??</li>
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