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‎reference/memory/assume_aligned.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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2024年06月11日 13時45分38秒
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<span itemprop="datePublished" content="2024-12-20T01:21:34">
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<span itemprop="name">Akira Takahashi</span>
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<span itemprop="name">yoh</span>
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<ul>
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<li><code><a href="../../lang/cpp11/alignas.html">alignas</a></code></li>
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<li><code><a href="../../lang/cpp11/alignof.html">alignof</a></code></li>
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<li><code><a href="is_sufficiently_aligned.html">is_sufficiently_aligned</a></code></li>
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<h2>参照</h2>
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<ul>

‎reference/memory/is_sufficiently_aligned.html‎

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最終更新日時(UTC):
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<span itemprop="datePublished" content="2024-12-20T01:21:34">
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2024年12月20日 01時21分34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">is_sufficiently_aligned</span><span class="cpp cpp26" title="C++26で追加">(C++26)</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">template</span><span class="o">&lt;</span><span class="kt">size_t</span> <span class="n">Alignment</span><span class="p">,</span> <span class="k">class</span> <span class="nc">T</span><span class="o">&gt;</span>
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<span class="kt">bool</span> <span class="n">is_sufficiently_aligned</span><span class="p">(</span><span class="n">T</span><span class="o">*</span> <span class="n">ptr</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>ポインタ値が指定したアライメントを満たすか否かを返す。</p>
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<h2>事前条件</h2>
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<p>ポインタ<code>p</code>が、<code>T</code>に類似(similar)した型のオブジェクト<code>X</code>を指すこと。</p>
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<h2>戻り値</h2>
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<p><code>X</code>が少なくとも<code>Alignment</code>でアライメントされるならば<code>true</code>。そうでなければ<code>false</code>。</p>
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<h2>例外</h2>
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<p>投げない</p>
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<h2>この機能が必要になった背景・経緯</h2>
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<p>この関数テンプレートは<code><a href="../mdspan.html">&lt;mdspan&gt;</a></code>ヘッダへの<code><span href="https://cpprefjp.github.io/reference/mdspan/aligned_accessor.md.nolink">aligned_accessor</span></code>導入に伴って必要とされた機能である。
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一方で、ポインタ値のアライメント要件を検査するユースケースは一般的と考えられたため、汎用ユーティリティとして<code>&lt;memory&gt;</code>ヘッダに対して機能追加された。</p>
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<h2>例</h2>
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<p><div class="yata" id="f59e08f2a992387e6c7508fb5e68d201bb373896"><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="../memory.html">&lt;memory&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf">&lt;news&gt;</span><span class="cp"></span>
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<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="kt">int</span> <span class="o">*</span><span class="n">ptr</span> <span class="o">=</span> <span class="k">new</span><span class="p">(</span><span class="n"><a href="../new/align_val_t.html">std::align_val_t</a></span><span class="p">{</span><span class="mi">32</span><span class="p">})</span> <span class="kt">int</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">std::is_sufficiently_aligned</span></span><span class="o">&lt;</span><span class="mi">32</span><span class="o">&gt;</span><span class="p">(</span><span class="n">ptr</span><span class="p">)</span> <span class="p">);</span>
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<span class="k">delete</span> <span class="n">ptr</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</h3>
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<p><pre><code></code></pre></p>
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<h2>実装例</h2>
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<p><div class="codehilite"><pre><span></span><code><span class="c1">// 提案文書P2897R7より引用</span>
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<span class="k">template</span><span class="o">&lt;</span><span class="kt">size_t</span> <span class="n">ByteAlignment</span><span class="p">,</span> <span class="k">class</span> <span class="nc">ElementType</span><span class="o">&gt;</span>
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<span class="kt">bool</span> <span class="n">is_sufficiently_aligned</span><span class="p">(</span><span class="n">ElementType</span><span class="o">*</span> <span class="n">p</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="k">return</span> <span class="n"><a href="../bit/bit_cast.html">bit_cast</a></span><span class="o">&lt;</span><span class="kt">uintptr_t</span><span class="o">&gt;</span><span class="p">(</span><span class="n">p</span><span class="p">)</span> <span class="o">%</span> <span class="n">ByteAlignment</span> <span class="o">==</span> <span class="mi">0</span><span class="p">;</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>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++26</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>: ??</li>
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<li><a href="../../implementation.html#gcc">GCC</a>: ??</li>
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<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: ??</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="assume_aligned.html">assume_aligned</a></code></li>
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<li><a href="../../lang/cpp17/dynamic_memory_allocation_for_over-aligned_data.html">アライメント指定されたデータの動的メモリ確保</a></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/2024/p2897r7.html" target="_blank">P2897R7 <code>aligned_accessor</code>: An mdspan accessor expressing pointer over-alignment</a></li>
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