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<div class="identifier-type">function</div><div class="header"><memory_resource></div><h1 itemprop="name"><span class="namespace" title="namespace std::pmr">std::pmr::</span><span class="token">set_default_resource</span><span class="cpp cpp17" title="C++17で追加">(C++17)</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="o">::</span><span class="nn">pmr</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">memory_resource</span><span class="o">*</span><span class="w"> </span><span class="nf">set_default_resource</span><span class="p">(</span><span class="n">memory_resource</span><span class="o">*</span><span class="w"> </span><span class="n">r</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code><a href="polymorphic_allocator.html">polymorphic_allocator</a></code>のコンストラクタ等で、<code>memory_resource</code>が指定されない場合に利用されるデフォルトの<code>memory_resource</code>を設定する。</p>
<h2>引数</h2>
<ul>
<li><code>r</code> -- 設定する<code>memory_resource</code>のポインタ</li>
</ul>
<h2>効果</h2>
<p><code>r</code>がnullでなければ、デフォルトの<code>memory_resource</code>のポインタを<code>r</code>に設定する。</p>
<p><code>r</code>がnullならば、デフォルトの<code>memory_resource</code>のポインタを<code><a href="new_delete_resource.html">new_delete_resource()</a></code>に設定する。</p>
<h2>スレッドセーフ</h2>
<p>この関数はスレッドセーフである。</p>
<p>この関数（<code>set_default_resource()</code>）の呼び出しと、後続のこの関数もしくは<code><a href="get_default_resource.html">get_default_resource()</a></code>の呼び出しは同期的に実行される。<br />
すなわち、この関数自身と<code><a href="get_default_resource.html">get_default_resource()</a></code>の呼び出しはデータ競合を起こさない。</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>以前に設定されていたデフォルトの<code>memory_resource</code>のポインタ。</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>投げない。</p>
<h2>備考</h2>
<p>この関数は受け取る<code>memory_resource</code>の所有権を保持しない。
そのため、設定する<code>memory_resource</code>オブジェクトの寿命には注意する必要がある。</p>
<h2>例</h2>
<p><div class="yata" id="1ad2b382c1e6525e96d520df81dbc5506eb3c874"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../memory_resource.html"><memory_resource></a></span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span>
<span class="p">{</span>
<span class="w"> </span><span class="k">auto</span><span class="o">*</span><span class="w"> </span><span class="n">mr</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">pmr</span><span class="o">::</span><span class="n"><a href="get_default_resource.html">get_default_resource</a></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"><a href="../ios/boolalpha.html">std::boolalpha</a></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="p">(</span><span class="n">mr</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">pmr</span><span class="o">::</span><span class="n"><a href="new_delete_resource.html">new_delete_resource</a></span><span class="p">())</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">//<a href="monotonic_buffer_resource.html">monotonic_buffer_resource</a>を設定</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">pmr</span><span class="o">::</span><span class="n"><a href="monotonic_buffer_resource.html">monotonic_buffer_resource</a></span><span class="w"> </span><span class="n">mono_mr</span><span class="p">{};</span>
<span class="w"> </span><span class="k">auto</span><span class="o">*</span><span class="w"> </span><span class="n">befor_mr</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">pmr</span><span class="o">::</span><span class="n"><span style="color:#ff0000">set_default_resource</span></span><span class="p">(</span><span class="o">&</span><span class="n">mono_mr</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="p">(</span><span class="n">mr</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">pmr</span><span class="o">::</span><span class="n"><a href="get_default_resource.html">get_default_resource</a></span><span class="p">())</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="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="p">(</span><span class="n">mr</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">befor_mr</span><span class="p">)</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>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>true
false
true
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++17</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>: 9.1 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2017 update 6 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
</ul>
<h2>関連項目</h2>
<ul>
<li><code><a href="memory_resource.html">memory_resource</a></code></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://wg21.cmeerw.net/lwg/issue2961" target="_blank">LWG Issue 2961. Bad postcondition for set_default_resource</a></li>
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