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‎lang/cpp23.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="2024-07-07T01:48:19">
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2024年07月07日 01時48分19秒
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<span itemprop="datePublished" content="2024-08-05T09:00:59">
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2024年08月05日 09時00分59秒
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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">suomesta</span>
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<span itemprop="name">Akira Takahashi</span>
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</span>
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が更新
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</small></p>
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<ul>
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<li><code><a href="../reference/stack/stack.html">std::stack</a></code>と<code><a href="../reference/queue/queue.html">std::queue</a></code>に、イテレータのペアをとるコンストラクタを追加</li>
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<li><code>auto v = std::vector(v, alloc);</code>のようなアロケータ引数をともなう場合のクラステンプレートのテンプレート引数推論が動作しなかったため、各コンテナクラスのコンストラクタにおけるアロケータパラメータの型を<code>const Allocator&amp;</code>から<code>const <a href="../reference/type_traits/type_identity.html">std::type_identity_t</a>&lt;Allocator&gt;&amp;</code>に修正</li>
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<li>N要素のメモリアロケート時にアロケータが実際にどれくらいのメモリを確保したかを得られるインタフェースとして、<code><a href="../reference/memory/allocator.html">std::allocator</a></code>クラスに、<code><span href="https://cpprefjp.github.io/reference/memory/allocator/allocate_at_least.md.nolink">allocate_at_least()</span></code>メンバ関数を追加</li>
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<li>N要素のメモリアロケート時にアロケータが実際にどれくらいのメモリを確保したかを得られるインタフェースとして、<ul>
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<li><code><a href="../reference/memory/allocator.html">std::allocator</a></code>クラスに、<code><a href="../reference/memory/allocator/allocate_at_least.html">allocate_at_least()</a></code>メンバ関数を追加</li>
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<li><code><a href="../reference/memory/allocate_at_least.html">std::allocate_at_least()</a></code>関数を追加</li>
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</ul>
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</li>
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<li><code><a href="../reference/utility/pair.html">std::pair</a></code>の転送コンストラクタにデフォルトテンプレート引数を追加することで、<code>{}</code>のような型推論ができない引数を渡した場合でも完全転送が行われるよう修正</li>
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<li>順序付き連想コンテナの要素削除の処理について、一時オブジェクトのコストを抑える拡張が行われた<ul>
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<li><code><a href="../reference/map/map/erase.html">std::map::erase()</a></code></li>

‎reference/memory.html

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最終更新日時(UTC):
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<span itemprop="datePublished" content="2023-01-23T08:34:13">
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2023年01月23日 08時34分13秒
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<span itemprop="datePublished" content="2024-08-05T09:00:59">
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2024年08月05日 09時00分59秒
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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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<td>C++11</td>
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</tr>
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<tr>
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<td><code><a href="memory/allocation_result.html">allocation_result</a></code></td>
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<td><code><a href="memory/allocate_at_least.html">allocate_at_least()</a></code>関数の戻り値型</td>
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<td>C++23</td>
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</tr>
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<tr>
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<td><code><a href="memory/allocate_at_least.html">allocate_at_least</a></code></td>
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<td>指定した要素数以上のメモリを確保する</td>
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<td>C++23</td>
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</tr>
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<tr>
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<td><code><a href="memory/allocator_arg_t.html">allocator_arg_t</a></code></td>
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<td>アロケータを引数として渡す際の、オーバーロード解決のためのタグ(class)</td>
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<td>C++11</td>

‎reference/memory/allocate_at_least.html

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2024年08月05日 09時00分59秒
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<div class="identifier-type">function template</div><div class="header">&lt;memory&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">alloacte_at_least</span><span class="cpp cpp23" title="C++23で追加">(C++23)</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span> <span class="n">std</span> <span class="p">{</span>
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<span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span> <span class="nc">Allocator</span><span class="o">&gt;</span>
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<span class="p">[[</span><span class="n">nodiscard</span><span class="p">]</span> <span class="k">constexpr</span>
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<span class="n"><a href="allocation_result.html">allocation_result</a></span><span class="o">&lt;</span><span class="k">typename</span> <span class="n"><a href="allocator_traits.html">allocator_traits</a></span><span class="o">&lt;</span><span class="n">Allocator</span><span class="o">&gt;::</span><span class="n">pointer</span><span class="o">&gt;</span>
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<span class="n">allocate_at_least</span><span class="p">(</span><span class="n">Allocator</span><span class="o">&amp;</span> <span class="n">a</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">n</span><span class="p">);</span> <span class="c1">// (1) C++23</span>
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<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>指定した要素数以上のメモリを確保する。</p>
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<p>多くのメモリアロケータはメモリ確保時に指定されたサイズちょうどではなく、少し大きなサイズを確保する。この関数は、確保されたメモリへのポインタに加えて、実際に確保されたメモリサイズを取得できる。</p>
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<h2>戻り値</h2>
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<p>式<code>a.allocate_at_least(n)</code>が妥当である場合、それを呼び出して返す。そうでなければ、<code>{a.allocate(n), n}</code>を返す。</p>
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<h2>例</h2>
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<p><div class="yata" id="78a4ad210c9825fcac351e0cd0e5b4079d322e2f"><div class="codehilite"><pre><span></span><code><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="cp">#include</span> <span class="cpf"><a href="../memory.html">&lt;memory&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="n"><a href="allocator.html">std::allocator</a></span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span> <span class="n">alloc</span><span class="p">;</span>
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<span class="n"><a href="allocation_result.html">std::allocation_result</a></span><span class="o">&lt;</span><span class="kt">int</span><span class="o">*&gt;</span> <span class="n">r</span> <span class="o">=</span> <span class="n"><span style="color:#ff0000">std::allocate_at_least</span></span><span class="p">(</span><span class="n">alloc</span><span class="p">,</span> <span class="mi">3</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">"allocation count:"</span> <span class="o">&lt;&lt;</span> <span class="n">r</span><span class="p">.</span><span class="n">count</span>
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<span class="o">&lt;&lt;</span> <span class="s">" bytes:"</span> <span class="o">&lt;&lt;</span> <span class="k">sizeof</span><span class="p">(</span><span class="kt">int</span><span class="p">)</span> <span class="o">*</span> <span class="n">r</span><span class="p">.</span><span class="n">count</span>
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<span class="o">&lt;&lt;</span> <span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
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<span class="n"><a href="allocator/deallocate.html">alloc.deallocate</a></span><span class="p">(</span><span class="n">r</span><span class="p">.</span><span class="n">ptr</span><span class="p">,</span> <span class="n">r</span><span class="p">.</span><span class="n">count</span><span class="p">);</span>
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<span class="p">}</span>
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</code></pre></div>
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</div></p>
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<h3>出力例</h3>
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<p><pre><code>allocation count:4 bytes:16
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</code></pre></p>
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<h2>バージョン</h2>
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<h3>言語</h3>
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<ul>
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<li>C++23</li>
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</ul>
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<h3>処理系</h3>
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<ul>
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<li><a href="../../implementation.html#clang">Clang</a>: 19 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
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<li><a href="../../implementation.html#gcc">GCC</a>: 14 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
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<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2022 Update 10 <span aria-label="未実装" role="img" title="未実装">❌</span></li>
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</ul>
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<h2>関連項目</h2>
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<ul>
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<li><code><a href="allocation_result.html">std::allocation_result</a></code></li>
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<li><code><a href="allocator.html">std::allocator</a>::<a href="allocator/allocate_at_least.html">allocate_at_least()</a></code></li>
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</ul>
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<h2>参照</h2>
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<ul>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p0401r6.html" target="_blank">P0401R6 Providing size feedback in the Allocator interface</a></li>
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