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‎reference/mutex/try_lock.html‎

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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;mutex&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;id-type&#34;: [&#34;function template&#34;], &#34;cpp&#34;: [&#34;cpp11&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;d919e77fd7cd8e4a0c5a6c85363cd38fe6c65b5a&#34;, &#34;source&#34;: &#34;#include &lt;cassert&gt;\n#include &lt;mutex&gt;\n\nint main()\n{\n std::mutex mtx1;\n std::recursive_mutex mtx2;\n\n // \u8907\u6570\u306e\u30df\u30e5\u30fc\u30c6\u30c3\u30af\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066try_lock()\u3092\u547c\u3073\u51fa\u3059\n {\n int result = std::try_lock(mtx1, mtx2);\n\n assert(result == -1); // \u5168\u3066\u306etry_lock()\u547c\u3073\u51fa\u3057\u304c\u6210\u529f\n\n mtx1.unlock();\n mtx2.unlock();\n }\n\n // unique_lock\u306b\u5bfe\u3057\u3066try_lock()\u3092\u547c\u3073\u51fa\u3059\n {\n std::unique_lock&lt;std::mutex&gt; lk1(mtx1, std::defer_lock);\n std::unique_lock&lt;std::recursive_mutex&gt; lk2(mtx2, std::defer_lock);\n\n int result = std::try_lock(lk1, lk2);\n\n assert(result == -1); // \u5168\u3066\u306etry_lock()\u547c\u3073\u51fa\u3057\u304c\u6210\u529f\n }\n\n // \u4e00\u90e8\u306etry_lock()\u304c\u5931\u6557\u3059\u308b\u5834\u5408\n {\n // mtx2\u3092\u30ed\u30c3\u30af\u3057\u3066\u304a\u304f\u3002\n std::lock_guard&lt;std::recursive_mutex&gt; lk2_main_thread(mtx2);\n\n std::thread th([&amp;]\n {\n std::unique_lock&lt;std::mutex&gt; lk1(mtx1, std::defer_lock);\n std::unique_lock&lt;std::recursive_mutex&gt; lk2(mtx2, std::defer_lock);\n\n // \u4ed6\u306e\u30b9\u30ec\u30c3\u30c9\u3067mtx2\u3092\u30ed\u30c3\u30af\u3057\u3066\u3044\u308b\u305f\u3081\u3001lk2\u306e\u30ed\u30c3\u30af\u306b\u5931\u6557\u3059\u308b\u3002\n int result = std::try_lock(lk1, lk2);\n\n // lk2\u304c\u5931\u6557\u3057\u305f\u306e\u3067\u7b2c2\u5f15\u6570\u3092\u793a\u30591\u304c\u8fd4\u308b(0\u59cb\u307e\u308a)\n assert(result == 1);\n\n // lk2\u304c\u5931\u6557\u3057\u305f\u306e\u3067\u3001std::try_lock()\u5185\u3067lk2\u3088\u308a\u524d\u306btry_lock()\u304c\n // \u6210\u529f\u3057\u305f\u5168\u3066\u306e\u30df\u30e5\u30fc\u30c6\u30c3\u30af\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cunlock()\u3055\u308c\u308b\n assert(!lk1.owns_lock());\n });\n th.join();\n }\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;mutex&#34;, &#34;try_lock&#34;]}">
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;mutex&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;id-type&#34;: [&#34;function template&#34;], &#34;cpp&#34;: [&#34;cpp11&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;ce239b3c538ab7de7738cebf8b6780a36152eae0&#34;, &#34;source&#34;: &#34;#include &lt;cassert&gt;\n#include &lt;thread&gt;\n#include &lt;mutex&gt;\n\nint main()\n{\n std::mutex mtx1;\n std::recursive_mutex mtx2;\n\n // \u8907\u6570\u306e\u30df\u30e5\u30fc\u30c6\u30c3\u30af\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066try_lock()\u3092\u547c\u3073\u51fa\u3059\n {\n int result = std::try_lock(mtx1, mtx2);\n\n assert(result == -1); // \u5168\u3066\u306etry_lock()\u547c\u3073\u51fa\u3057\u304c\u6210\u529f\n\n mtx1.unlock();\n mtx2.unlock();\n }\n\n // unique_lock\u306b\u5bfe\u3057\u3066try_lock()\u3092\u547c\u3073\u51fa\u3059\n {\n std::unique_lock&lt;std::mutex&gt; lk1(mtx1, std::defer_lock);\n std::unique_lock&lt;std::recursive_mutex&gt; lk2(mtx2, std::defer_lock);\n\n int result = std::try_lock(lk1, lk2);\n\n assert(result == -1); // \u5168\u3066\u306etry_lock()\u547c\u3073\u51fa\u3057\u304c\u6210\u529f\n }\n\n // \u4e00\u90e8\u306etry_lock()\u304c\u5931\u6557\u3059\u308b\u5834\u5408\n {\n // mtx2\u3092\u30ed\u30c3\u30af\u3057\u3066\u304a\u304f\u3002\n std::lock_guard&lt;std::recursive_mutex&gt; lk2_main_thread(mtx2);\n\n std::thread th([&amp;]\n {\n std::unique_lock&lt;std::mutex&gt; lk1(mtx1, std::defer_lock);\n std::unique_lock&lt;std::recursive_mutex&gt; lk2(mtx2, std::defer_lock);\n\n // \u4ed6\u306e\u30b9\u30ec\u30c3\u30c9\u3067mtx2\u3092\u30ed\u30c3\u30af\u3057\u3066\u3044\u308b\u305f\u3081\u3001lk2\u306e\u30ed\u30c3\u30af\u306b\u5931\u6557\u3059\u308b\u3002\n int result = std::try_lock(lk1, lk2);\n\n // lk2\u304c\u5931\u6557\u3057\u305f\u306e\u3067\u7b2c2\u5f15\u6570\u3092\u793a\u30591\u304c\u8fd4\u308b(0\u59cb\u307e\u308a)\n assert(result == 1);\n\n // lk2\u304c\u5931\u6557\u3057\u305f\u306e\u3067\u3001std::try_lock()\u5185\u3067lk2\u3088\u308a\u524d\u306btry_lock()\u304c\n // \u6210\u529f\u3057\u305f\u5168\u3066\u306e\u30df\u30e5\u30fc\u30c6\u30c3\u30af\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cunlock()\u3055\u308c\u308b\n assert(!lk1.owns_lock());\n });\n th.join();\n }\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;mutex&#34;, &#34;try_lock&#34;]}">
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<div class="navbar-header">
@@ -188,12 +188,12 @@
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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="2024-06-11T13:45:38">
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2024年06月11日 13時45分38秒
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<span itemprop="datePublished" content="2025-03-02T06:55:40">
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2025年03月02日 06時55分40秒
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</span>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span itemprop="name">Akira Takahashi</span>
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<span itemprop="name">komori-n</span>
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</span>
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が更新
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</small></p>
@@ -230,7 +230,8 @@ <h2><a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価
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<p>全てのミューテックスオブジェクトへの<code>try_lock()</code>が成功した場合、<code>-1</code>を返す。</p>
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<p>いずれかの<code>try_lock()</code>が失敗して終了した場合、失敗した最初のミューテックスオブジェクトへの<code>0</code>から始まるインデックスを返す。</p>
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<h2>例</h2>
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<p><div class="yata" id="d919e77fd7cd8e4a0c5a6c85363cd38fe6c65b5a"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../cassert.html">&lt;cassert&gt;</a></span><span class="cp"></span>
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<p><div class="yata" id="ce239b3c538ab7de7738cebf8b6780a36152eae0"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../cassert.html">&lt;cassert&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../thread.html">&lt;thread&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../mutex.html">&lt;mutex&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>

‎rss.xml‎

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<updated>2025-03-01T14:40:41.187204</updated>
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<entry>
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<title>try_lock -- try_lockのコード例のコンパイルが通らない問題を修正</title>
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<link href="https://cpprefjp.github.io/reference/mutex/try_lock.html"/>
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<id>c312d2fd51e6cc719dd305ada29e704f66a40647:reference/mutex/try_lock.md</id>
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<summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/mutex/try_lock.md b/reference/mutex/try_lock.md
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index 09155577f..35801efd9 100644
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--- a/reference/mutex/try_lock.md
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+++ b/reference/mutex/try_lock.md
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@@ -34,6 +34,7 @@ namespace std {
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## 例
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```cpp example
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#include &amp;lt;cassert&amp;gt;
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+#include &amp;lt;thread&amp;gt;
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#include &amp;lt;mutex&amp;gt;
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int main()
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&lt;/code&gt;&lt;/pre&gt;</summary>
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<author>
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<name>komori-n</name>
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<email>[email protected]</email>
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</author>
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<entry>
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<title>コンストラクタ -- リンクを修正</title>
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<link href="https://cpprefjp.github.io/reference/chrono/year_month_day/op_constructor.html"/>
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</author>
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</entry>
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<entry>
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<title>contains -- fix sample in flat_multiset</title>
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<link href="https://cpprefjp.github.io/reference/flat_set/flat_multiset/contains.html"/>
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<id>816853121ff41b05699b3edb3ec38c95cce82db5:reference/flat_set/flat_multiset/contains.md</id>
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<updated>2025-02-18T20:11:13+09:00</updated>
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<summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/flat_set/flat_multiset/contains.md b/reference/flat_set/flat_multiset/contains.md
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index 48e2daa1a..3bc429600 100644
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--- a/reference/flat_set/flat_multiset/contains.md
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+++ b/reference/flat_set/flat_multiset/contains.md
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int main()
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{
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// キー3の要素が含まれているか
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if (fs.contains(3)) {
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&lt;/code&gt;&lt;/pre&gt;</summary>
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<author>
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<name>suomesta</name>
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<email>[email protected]</email>
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