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最終更新日時(UTC):
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2026年01月06日 03時47分59秒
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
<span itemprop="name">Koichi Murase</span>
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<div class="identifier-type">function template</div><div class="header"><memory></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">uninitialized_copy_n</span><span class="cpp cpp11" title="C++11で追加">(C++11)</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="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Size</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">ForwardIterator</span><span class="o">></span>
<span class="w"> </span><span class="n">ForwardIterator</span>
<span class="w"> </span><span class="n">uninitialized_copy_n</span><span class="p">(</span><span class="n">InputIterator</span><span class="w"> </span><span class="n">first</span><span class="p">,</span>
<span class="w"> </span><span class="n">Size</span><span class="w"> </span><span class="n">n</span><span class="p">,</span>
<span class="w"> </span><span class="n">ForwardIterator</span><span class="w"> </span><span class="n">result</span><span class="p">);</span><span class="w"> </span><span class="c1">// (1) C++11</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Size</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">ForwardIterator</span><span class="o">></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n">ForwardIterator</span>
<span class="w"> </span><span class="n">uninitialized_copy_n</span><span class="p">(</span><span class="n">InputIterator</span><span class="w"> </span><span class="n">first</span><span class="p">,</span>
<span class="w"> </span><span class="n">Size</span><span class="w"> </span><span class="n">n</span><span class="p">,</span>
<span class="w"> </span><span class="n">ForwardIterator</span><span class="w"> </span><span class="n">result</span><span class="p">);</span><span class="w"> </span><span class="c1">// (1) C++26</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc"><a href="../execution/execution/execution_policy.html">ExecutionPolicy</a></span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Size</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">ForwardIterator</span><span class="o">></span>
<span class="w"> </span><span class="n">ForwardIterator</span>
<span class="w"> </span><span class="n">uninitialized_copy_n</span><span class="p">(</span><span class="n"><a href="../execution/execution/execution_policy.html">ExecutionPolicy</a></span><span class="o">&&</span><span class="w"> </span><span class="n">exec</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator</span><span class="w"> </span><span class="n">first</span><span class="p">,</span>
<span class="w"> </span><span class="n">Size</span><span class="w"> </span><span class="n">n</span><span class="p">,</span>
<span class="w"> </span><span class="n">ForwardIterator</span><span class="w"> </span><span class="n">result</span><span class="p">);</span><span class="w"> </span><span class="c1">// (2) C++17</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>未初期化領域の範囲のうち、先頭<code>N</code>個の要素を配置<code>new</code>で初期化してコピー出力する。</p>
<p>入力<a class="cpprefjp-defined-word" data-desc="2つのイテレータで表現される半開区間を表す。C++20からイテレータと番兵で異なる型であっても指定可能になる">イテレータ範囲</a><code>[first, first + n)</code>のコピーを未初期化出力<a class="cpprefjp-defined-word" data-desc="2つのイテレータで表現される半開区間を表す。C++20からイテレータと番兵で異なる型であっても指定可能になる">イテレータ範囲</a><code>[result, result + n)</code>に書き込む。</p>
<h2><a class="cpprefjp-defined-word" data-desc="関数等の意味論を構成する要素の1つ。Preconditions。関数呼び出し時に満たされていると関数が想定する条件。満たさなければ未定義の動作。契約属性の`[[expects]]`に相当">事前条件</a></h2>
<ul>
<li><a class="cpprefjp-defined-word" data-desc="2つのイテレータで表現される半開区間を表す。C++20からイテレータと番兵で異なる型であっても指定可能になる">イテレータ範囲</a><code>[result, result + n)</code>が<code>[first, first + n)</code>と重ならないこと</li>
</ul>
<h2>効果</h2>
<ul>
<li>
<p>C++11 : 以下と等価
<br />
<div class="codehilite"><pre><span></span><code><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="o">></span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="o">++</span><span class="n">result</span><span class="p">,</span><span class="w"> </span><span class="o">++</span><span class="n">first</span><span class="p">,</span><span class="w"> </span><span class="o">--</span><span class="n">n</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="o">::</span><span class="k">new</span><span class="w"> </span><span class="p">(</span><span class="k">static_cast</span><span class="o"><</span><span class="kt">void</span><span class="o">*></span><span class="p">(</span><span class="o">&*</span><span class="n">result</span><span class="p">))</span>
<span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc"><a href="../iterator/iterator_traits.html">iterator_traits</a></span><span class="o"><</span><span class="n">ForwardIterator</span><span class="o">>::</span><span class="n">value_type</span><span class="p">(</span><span class="o">*</span><span class="n">first</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</p>
</li>
<li>
<p>C++17 : 以下と等価
<br />
<div class="codehilite"><pre><span></span><code><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="o">></span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="o">++</span><span class="n">result</span><span class="p">,</span><span class="w"> </span><span class="o">++</span><span class="n">first</span><span class="p">,</span><span class="w"> </span><span class="o">--</span><span class="n">n</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="o">::</span><span class="k">new</span><span class="w"> </span><span class="p">(</span><span class="k">static_cast</span><span class="o"><</span><span class="kt">void</span><span class="o">*></span><span class="p">(</span><span class="n"><a href="addressof.html">addressof</a></span><span class="p">(</span><span class="o">*</span><span class="n">result</span><span class="p">)))</span>
<span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc"><a href="../iterator/iterator_traits.html">iterator_traits</a></span><span class="o"><</span><span class="n">ForwardIterator</span><span class="o">>::</span><span class="n">value_type</span><span class="p">(</span><span class="o">*</span><span class="n">first</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</p>
</li>
</ul>
<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><code>result</code></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>呼び出すコンストラクタなどから<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>が送出された場合、その<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>がこの関数の外側に伝播される前に、その時点で構築済のオブジェクトは全て<a class="cpprefjp-defined-word" data-desc="未規定の動作。事前の断りなく処理系によって異なる動作をする" href="../../implementation-compliance.html#dfn-unspecified-behavior">未規定</a>の順序で破棄される。すなわち、<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>が送出された場合は初期化対象領域は未初期化のままとなる。</p>
<h3>例</h3>
<p><div class="yata" id="091ffe3938e270307b5607893959dd32842484dd"><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.html"><memory></a></span>
<span class="cp">#include <a href="../vector.html"><vector></a></span>
<span class="cp">#include <a href="../algorithm.html"><algorithm></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">const</span><span class="w"> </span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">v</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">};</span>
<span class="w"> </span><span class="n"><a href="allocator.html">std::allocator</a></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">alloc</span><span class="p">;</span>
<span class="w"> </span><span class="c1">// メモリ確保。</span>
<span class="w"> </span><span class="c1">// この段階では、[p, p + size)の領域は未初期化</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../cstddef/size_t.html">std::size_t</a></span><span class="w"> </span><span class="n">size</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">3</span><span class="p">;</span>
<span class="w"> </span><span class="kt">int</span><span class="o">*</span><span class="w"> </span><span class="n">p</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="allocator/allocate.html">alloc.allocate</a></span><span class="p">(</span><span class="n">size</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// 未初期化領域pを初期化しつつ範囲vから要素をコピー</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::uninitialized_copy_n</span></span><span class="p">(</span><span class="n"><a href="../vector/vector/begin.html">v.begin()</a></span><span class="p">,</span><span class="w"> </span><span class="n">size</span><span class="p">,</span><span class="w"> </span><span class="n">p</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// pの領域が初期化され、かつvからpに要素がコピーされているか確認</span>
<span class="w"> </span><span class="n"><a href="../algorithm/for_each.html">std::for_each</a></span><span class="p">(</span><span class="n">p</span><span class="p">,</span><span class="w"> </span><span class="n">p</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">size</span><span class="p">,</span><span class="w"> </span><span class="p">[](</span><span class="kt">int</span><span class="w"> </span><span class="n">x</span><span class="p">)</span><span class="w"> </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">x</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="p">});</span>
<span class="w"> </span><span class="c1">// 要素を破棄</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n"><a href="../cstddef/size_t.html">std::size_t</a></span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="n">size</span><span class="p">;</span><span class="w"> </span><span class="o">++</span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="allocator/destroy.html">alloc.destroy</a></span><span class="p">(</span><span class="n">p</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">i</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="c1">// メモリ解放</span>
<span class="w"> </span><span class="n"><a href="allocator/deallocate.html">alloc.deallocate</a></span><span class="p">(</span><span class="n">p</span><span class="p">,</span><span class="w"> </span><span class="n">size</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>1
2
3
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++11</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#gcc">GCC</a>: 4.4.7 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#clang">Clang</a>: 3.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#icc">ICC</a>: ?</li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: ?</li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2569.pdf" target="_blank">N2569 More STL algorithms</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2666.pdf" target="_blank">N2666 More STL algorithms (revision 2)</a></li>
<li><a href="https://wg21.cmeerw.net/lwg/issue2433" target="_blank">LWG Issue 2433 <code>uninitialized_copy()</code>/etc. should tolerate overloaded <code>operator&</code></a></li>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2024/p3508r0.html" target="_blank">P3508R0 Wording for "constexpr for specialized memory algorithms"</a><ul>
<li>C++26から<code>constexpr</code>がついた</li>
</ul>
</li>
</ul></div>
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