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<div class="identifier-type">function template</div><div class="header"><iterator></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">next</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">ForwardIterator</span><span class="o">></span>
<span class="w"> </span><span class="n">ForwardIterator</span><span class="w"> </span><span class="n">next</span><span class="p">(</span><span class="n">ForwardIterator</span><span class="w"> </span><span class="n">x</span><span class="p">,</span>
<span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">std</span><span class="o">::</span><span class="n"><a href="iterator_traits.html">iterator_traits</a></span><span class="o"><</span><span class="n">ForwardIterator</span><span class="o">>::</span><span class="n">difference_type</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">1</span><span class="p">);</span><span class="w"> </span><span class="c1">// 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="o">></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n">InputIterator</span><span class="w"> </span><span class="n">next</span><span class="p">(</span><span class="n">InputIterator</span><span class="w"> </span><span class="n">x</span><span class="p">,</span>
<span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">std</span><span class="o">::</span><span class="n"><a href="iterator_traits.html">iterator_traits</a></span><span class="o"><</span><span class="n">InputIterator</span><span class="o">>::</span><span class="n">difference_type</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">1</span><span class="p">);</span><span class="w"> </span><span class="c1">// C++17</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>n</code>回前方に進めたイテレータを返す。</p>
<p><code><a href="advance.html">advance()</a></code>と違い、引数として渡されたイテレータへの参照を書き換えるのではなく、<code>n</code>回進んだイテレータのコピーを返す。</p>
<h2>効果</h2>
<p><div class="codehilite"><pre><span></span><code><span class="n"><a href="advance.html">advance</a></span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">n</span><span class="p">);</span>
<span class="k">return</span><span class="w"> </span><span class="n">x</span><span class="p">;</span>
</code></pre></div>
</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>引数として渡されたイテレータを<code>n</code>回前方に進めたイテレータのコピー</p>
<h2>例</h2>
<p><div class="yata" id="08c7eb43099d19d0e7dd4909bb19a74445d57a00"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../iterator.html"><iterator></a></span>
<span class="cp">#include <a href="../vector.html"><vector></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="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">3</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="mi">5</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">};</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">decltype</span><span class="p">(</span><span class="n">v</span><span class="p">)</span><span class="o">::</span><span class="n">iterator</span><span class="w"> </span><span class="n">it</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><span style="color:#ff0000">std::next</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="c1">// イテレータを1回進める</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="o">*</span><span class="n">it</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="p">{</span>
<span class="w"> </span><span class="k">decltype</span><span class="p">(</span><span class="n">v</span><span class="p">)</span><span class="o">::</span><span class="n">iterator</span><span class="w"> </span><span class="n">it</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><span style="color:#ff0000">std::next</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="mi">2</span><span class="p">);</span><span class="w"> </span><span class="c1">// イテレータを2回進める</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="o">*</span><span class="n">it</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="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>1
4
</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#clang">Clang</a>: 3.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#gcc">GCC</a>: 4.4.0 <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>関連項目</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="prev.html">prev()</a></code></td>
<td><code>n</code>回後方に進めたイテレータを返す</td>
</tr>
<tr>
<td><code><a href="advance.html">advance()</a></code></td>
<td><code>n</code>回イテレータを進める</td>
</tr>
</tbody>
</table>
<h2>参照</h2>
<ul>
<li><a href="http://www.boost.org/doc/libs/release/libs/utility/utility.htm#functions_next_prior" target="_blank">boost::next() - Boost Utility Library</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2246.html" target="_blank">N2246 2 of the least crazy ideas for the standard library in C++0x</a></li>
<li><a href="https://wg21.cmeerw.net/lwg/issue2353" target="_blank">LWG Issue 2353. <code>std::next</code> is over-constrained</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0031r0.html" target="_blank">P0031R0 A Proposal to Add Constexpr Modifiers to <code>reverse_iterator</code>, <code>move_iterator</code>, <code>array</code> and Range Access</a></li>
</ul></div>
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