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‎reference/chrono/make24.html

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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">12h</a></span><span class="p">,</span> <span class="nb">false</span><span class="p">)</span> <span class="o">==</span> <span class="n"><a href="duration/op_h.html">0h</a></span><span class="p">);</span>
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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">12h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="n"><a href="duration/op_h.html">12h</a></span><span class="p">);</span>
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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">1h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1l</span><span class="n">iQQQXVQTEZmhmbHllbuktlwNdBqDiBs</span><span class="p">);</span>
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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">1h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="n"><a href="duration/op_h.html">3h</a></span><span class="p">);</span>
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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">3h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="n"><a href="duration/op_h.html">15h</a></span><span class="p">);</span>
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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">11h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="n"><a href="duration/op_h.html">23h</a></span><span class="p">);</span>
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<span class="p">}</span>

‎reference/cstdio.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="2025-07-05T06:59:15">
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2025年07月05日 06時59分15秒
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<span itemprop="datePublished" content="2025-07-05T07:11:33">
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2025年07月05日 07時11分33秒
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</span>
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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/cstdio/tempname.md.nolink">tempname</span></code></td>
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<td><code><a href="cstdio/tmpnam.html">tmpnam</a></code></td>
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<td>一時ファイル名を生成する</td>
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<td></td>
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</tr>

‎reference/cstdio/tmpnam.html

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最終更新日時(UTC):
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2025年07月05日 07時11分33秒
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<span itemprop="name">rotarymars</span>
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<span class="fa fa-fw fa-clock-o fa-flip-horizontal"></span>履歴
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<a class="edit" target="_blank" href="https://github.com/cpprefjp/site/edit/master/reference/cstdio/tmpnam.md">
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<span class="fa fa-fw fa-pencil"></span>編集
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<div class="identifier-type">function</div><div class="header">&lt;cstdio&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">tmpnam</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="kt">char</span><span class="o">*</span> <span class="nf">tmpnam</span><span class="p">(</span> <span class="kt">char</span><span class="o">*</span> <span class="n">filename</span> <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>一時ファイル名を生成する。</p>
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<p>渡した引数の中にファイル名が格納される。</p>
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<p>この関数はスレッドセーフではないため、マルチスレッド環境での使用は推奨されない。</p>
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<p>また、生成された名前が他のファイル名とかぶらないことは保証されていない（保証する必要があるならば<code><a href="tmpfile.html">tmpfile</a></code>を使用する）。</p>
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<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>
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<p>成功した場合</p>
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<ul>
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<li>渡した引数のポインタを返す。</li>
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<li>渡した引数が<code>NULL</code>であった場合、内部にある静的なバッファへのポインタが返される。</li>
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</ul>
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<p>失敗した場合、<code>NULL</code>を返す。</p>
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<h2>例</h2>
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<p><div class="yata" id="6ef226ce938b6ee93f604437a18faeb8b2a7905a"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../cstdio.html">&lt;cstdio&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">main</span><span class="p">()</span> <span class="p">{</span>
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<span class="kt">char</span> <span class="n">filename</span><span class="p">[</span><span class="mi">1000</span><span class="p">];</span>
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<span class="k">if</span> <span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">tmpnam</span><span class="p">(</span><span class="n">filename</span><span class="p">))</span> <span class="p">{</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">"Generated filename: "</span> <span class="o">&lt;&lt;</span> <span class="n">filename</span> <span class="o">&lt;&lt;</span> <span class="sc">'\n'</span><span class="p">;</span>
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<span class="c1">// ここで fopen(filename, "w") とかして使う（が、あまり推奨されない）</span>
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<span class="p">}</span> <span class="k">else</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">"Failed to generate temp name</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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<h2>処理系</h2>
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<ul>
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<li><a href="../../implementation.html#clang">Clang</a>: ??</li>
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<li><a href="../../implementation.html#gcc">GCC</a>: ??</li>
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