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<h1 itemprop="name"><span class="token">サイズ付きデアロケーション [N3778]</span><span class="cpp cpp14" title="C++14で追加">(C++14)</span></h1>
<div itemprop="articleBody"><p></p>
<p>このページはC++14に採用された言語機能の変更を解説しています。</p>
<p>のちのC++規格でさらに変更される場合があるため<a href="#relative-page">関連項目</a>を参照してください。</p>
<p></p>
<h2>概要</h2>
<p>C++03ではクラス用の<code>delete</code>演算子として、サイズをとるバージョンを<a class="cpprefjp-defined-word" data-desc="同名の関数を異なる引数・テンプレート・制約などで複数定義すること。または同名の関数の集合">オーバーロード</a>できた。C++14では、それに対応するグローバルの<code>delete</code>演算子を定義できるようにする。</p>
<p>C++14では、<a class="cpprefjp-defined-word" data-desc="同名の関数を異なる引数・テンプレート・制約などで複数定義すること。または同名の関数の集合">オーバーロード</a>可能なグローバルの<code>new</code>演算子、<code>delete</code>演算子として、以下を許可する：</p>
<p><div class="codehilite"><pre><span></span><code><span class="k">operator</span><span class="w"> </span><span class="k">new</span><span class="p">(</span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="p">)</span>
<span class="k">operator</span><span class="w"> </span><span class="k">new</span><span class="p">(</span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../../reference/new/nothrow_t.html">std::nothrow_t</a></span><span class="o">&</span><span class="p">)</span>
<span class="k">operator</span><span class="w"> </span><span class="k">new</span><span class="p">[](</span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="p">)</span>
<span class="k">operator</span><span class="w"> </span><span class="k">new</span><span class="p">[](</span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../../reference/new/nothrow_t.html">std::nothrow_t</a></span><span class="o">&</span><span class="p">)</span>
<span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="p">)</span>
<span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../../reference/new/nothrow_t.html">std::nothrow_t</a></span><span class="o">&</span><span class="p">)</span>
<span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">[](</span><span class="kt">void</span><span class="o">*</span><span class="p">)</span>
<span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">[](</span><span class="kt">void</span><span class="o">*</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../../reference/new/nothrow_t.html">std::nothrow_t</a></span><span class="o">&</span><span class="p">)</span>
<span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="p">)</span><span class="w"> </span><span class="c1">// C++14から追加</span>
<span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../../reference/new/nothrow_t.html">std::nothrow_t</a></span><span class="o">&</span><span class="p">)</span><span class="w"> </span><span class="c1">// C++14から追加（ただし、備考を参照）</span>
<span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">[](</span><span class="kt">void</span><span class="o">*</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="p">)</span><span class="w"> </span><span class="c1">// C++14から追加</span>
<span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">[](</span><span class="kt">void</span><span class="o">*</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../../reference/new/nothrow_t.html">std::nothrow_t</a></span><span class="o">&</span><span class="p">)</span><span class="w"> </span><span class="c1">// C++14から追加（ただし、備考を参照）</span>
</code></pre></div>
</p>
<p>追加分の詳細なインタフェースは、以下のようになっている：</p>
<p><div class="codehilite"><pre><span></span><code><span class="kt">void</span><span class="w"> </span><span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="w"> </span><span class="n">ptr</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="w"> </span><span class="n">size</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="w"> </span><span class="n">ptr</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="w"> </span><span class="n">size</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../../reference/new/nothrow_t.html">std::nothrow_t</a></span><span class="o">&</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span><span class="w"> </span><span class="c1">// ただし、備考を参照</span>
<span class="kt">void</span><span class="w"> </span><span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">[](</span><span class="kt">void</span><span class="o">*</span><span class="w"> </span><span class="n">ptr</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="w"> </span><span class="n">size</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">[](</span><span class="kt">void</span><span class="o">*</span><span class="w"> </span><span class="n">ptr</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="w"> </span><span class="n">size</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../../reference/new/nothrow_t.html">std::nothrow_t</a></span><span class="o">&</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span><span class="w"> </span><span class="c1">// ただし、備考を参照</span>
</code></pre></div>
</p>
<p>この機能を有効活用することで、メモリアロケータのパフォーマンスを向上できる可能性がある。</p>
<h2>仕様</h2>
<ul>
<li>サイズをとる<code>delete</code>演算子に渡される<code>size</code>パラメータは、対応する<code>new</code>演算子に渡された<code>size</code>パラメータと等しい</li>
<li>型<code>T</code>が<a class="cpprefjp-defined-word" data-desc="型のサイズを決定できる型。不完全型ではない型">完全型</a>でかつ、<code>void*</code>をパラメータにとる<code>delete</code>演算子と<code>void*</code>と<code><a href="../../reference/cstddef/size_t.html">std::size_t</a></code>のパラメータにとる<code>delete</code>演算子の両方が定義されている場合、型<code>T</code>のポインタに対する<code>delete</code>演算子の呼び出しは<code><a href="../../reference/cstddef/size_t.html">std::size_t</a></code>をとるバージョンを呼び出す</li>
</ul>
<h2>例</h2>
<p><div class="yata" id="0388ae5e9126ca5d94849dce03358f3ef63e3a57"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../../reference/cstdio.html"><cstdio></a></span>
<span class="cp">#include <a href="../../reference/cstdlib.html"><cstdlib></a></span>
<span class="cp">#include <a href="../../reference/new.html"><new></a></span>
<span class="kt">void</span><span class="o">*</span><span class="w"> </span><span class="k">operator</span><span class="w"> </span><span class="k">new</span><span class="p">[](</span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="w"> </span><span class="n">size</span><span class="p">)</span>
<span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../../reference/cstdio/printf.html">std::printf</a></span><span class="p">(</span><span class="s">"new size:%zu</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">size</span><span class="p">);</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n"><a href="../../reference/cstdlib/malloc.html">std::malloc</a></span><span class="p">(</span><span class="n">size</span><span class="p">);</span>
<span class="p">}</span>
<span class="kt">void</span><span class="w"> </span><span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">[](</span><span class="kt">void</span><span class="o">*</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span>
<span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../../reference/cstdio/printf.html">std::printf</a></span><span class="p">(</span><span class="s">"delete</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span>
<span class="p">}</span>
<span class="kt">void</span><span class="w"> </span><span class="k">operator</span><span class="w"> </span><span class="k">delete</span><span class="p">[](</span><span class="kt">void</span><span class="o">*</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../../reference/cstddef/size_t.html">std::size_t</a></span><span class="w"> </span><span class="n">t</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span>
<span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../../reference/cstdio/printf.html">std::printf</a></span><span class="p">(</span><span class="s">"delete with two arguments, %zu</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">t</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">struct</span><span class="w"> </span><span class="nc">A</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="o">~</span><span class="n">A</span><span class="p">()</span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="c1">// デストラクタを明示的に定義しない場合、</span>
<span class="w"> </span><span class="c1">// delete演算子が呼び出されない可能性がある</span>
<span class="p">};</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">delete</span><span class="p">[]</span><span class="w"> </span><span class="p">(</span><span class="k">new</span><span class="w"> </span><span class="n">A</span><span class="p">[</span><span class="mi">5</span><span class="p">]);</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>new size:13
delete with two arguments, 13
</code></pre></p>
<h2>備考</h2>
<ul>
<li>C++14 で追加された関数のうち、最後の引数が <code>const std::nothrow_t&</code> である<a class="cpprefjp-defined-word" data-desc="同名の関数を異なる引数・テンプレート・制約などで複数定義すること。または同名の関数の集合">オーバーロード</a> 2 つは、次期規格では削除される予定である。<br />
これは、当該<a class="cpprefjp-defined-word" data-desc="同名の関数を異なる引数・テンプレート・制約などで複数定義すること。または同名の関数の集合">オーバーロード</a>が <code>new</code> 式、あるいは <code>delete</code> 式から暗黙で呼び出される事は無いためである。</li>
<li>Clangは3.7以降、サイズをとる<code>delete</code>演算子を使用する場合、<code>-fsized-deallocation</code>オプションを付ける必要がある。</li>
</ul>
<h2><a href="#relative-page" id="relative-page">関連項目</a></h2>
<ul>
<li><code><a href="../../reference/memory/allocator/deallocate.html">allocator::deallocate</a></code></li>
<li><code><a href="../../reference/new/op_delete.html">operator delete</a></code></li>
<li><code><a href="../../reference/new/op_delete[].html">operator delete[]</a></code></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3432.html" target="_blank">N3432 C++ Sized Deallocation</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3536.html" target="_blank">N3536 C++ Sized Deallocation</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3663.html" target="_blank">N3663 C++ Sized Deallocation</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3778.html" target="_blank">N3778 C++ Sized Deallocation</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2458" target="_blank">LWG Issue 2458. N3778 and new library deallocation signatures</a></li>
</ul></div>
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