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<div class="identifier-type">class template</div><div class="header"><iterator></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">reverse_iterator</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">Iterator</span><span class="o">></span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">reverse_iterator</span>
<span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="n"><a href="iterator.html">iterator</a></span><span class="o"><</span><span class="k">typename</span><span class="w"> </span><span class="nc"><a href="iterator_traits.html">iterator_traits</a></span><span class="o"><</span><span class="n">Iterator</span><span class="o">>::</span><span class="n">iterator_category</span><span class="p">,</span>
<span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc"><a href="iterator_traits.html">iterator_traits</a></span><span class="o"><</span><span class="n">Iterator</span><span class="o">>::</span><span class="n">value_type</span><span class="p">,</span>
<span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc"><a href="iterator_traits.html">iterator_traits</a></span><span class="o"><</span><span class="n">Iterator</span><span class="o">>::</span><span class="n">difference_type</span><span class="p">,</span>
<span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc"><a href="iterator_traits.html">iterator_traits</a></span><span class="o"><</span><span class="n">Iterator</span><span class="o">>::</span><span class="n">pointer</span><span class="p">,</span>
<span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc"><a href="iterator_traits.html">iterator_traits</a></span><span class="o"><</span><span class="n">Iterator</span><span class="o">>::</span><span class="n">reference</span><span class="o">></span><span class="p">;</span>
<span class="w"> </span><span class="c1">// 距離を求められないイテレータペアについて、<a href="sized_sentinel_for.html">sized_sentinel_for</a>を無効化する（C++20）</span>
<span class="w"> </span><span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">Iterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Iterator2</span><span class="o">></span>
<span class="w"> </span><span class="k">requires</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="n"><a href="sized_sentinel_for.html">sized_sentinel_for</a></span><span class="o"><</span><span class="n">Iterator1</span><span class="p">,</span><span class="w"> </span><span class="n">Iterator2</span><span class="o">></span><span class="p">)</span>
<span class="w"> </span><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n"><a href="disable_sized_sentinel_for.html">disable_sized_sentinel_for</a></span><span class="o"><</span><span class="n">reverse_iterator</span><span class="o"><</span><span class="n">Iterator1</span><span class="o">></span><span class="p">,</span>
<span class="w"> </span><span class="n">reverse_iterator</span><span class="o"><</span><span class="n">Iterator2</span><span class="o">>></span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">true</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>reverse_iterator</code>は、イテレータを、逆方向に進むイテレータとしてラップするイテレータアダプタである。</p>
<p><code>end</code>イテレータを<code>reverse_iterator</code>でラップした場合、<code>end - 1</code> (つまり終端要素)を指し、<code>begin - 1</code>のイテレータを終端値としてみなす。</p>
<h2>要件</h2>
<ul>
<li>C++17まで : テンプレートパラメータ<code>Iterator</code>は、双方向イテレータの要件を満たすこと。ランダムアクセスイテレータであることを必要とする横断操作を使用する場合は、ランダムアクセスイテレータの要件を満たすこと。</li>
<li>C++20 : テンプレートパラメータ<code>Iterator</code>は、<code><a href="bidirectional_iterator.html">bidirectional_iterator</a></code>のモデルとなること。ランダムアクセスイテレータであることを必要とする横断操作を使用する場合は、<code><a href="random_access_iterator.html">random_access_iterator</a></code>のモデルとなること。</li>
</ul>
<h2>メンバ関数</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="reverse_iterator/op_constructor.html">(constructor)</a></code></td>
<td>コンストラクタ</td>
<td></td>
</tr>
<tr>
<td><code>~reverse_iterator() = default</code></td>
<td>デストラクタ</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_assign.html">operator=</a></code></td>
<td>代入演算子</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/base.html">base</a></code></td>
<td>元となったイテレータを取得する</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_deref.html">operator*</a></code></td>
<td>間接参照演算子</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_arrow.html">operator-></a></code></td>
<td>メンバアクセス演算子</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_increment.html">operator++</a></code></td>
<td>イテレータをインクリメントする</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_decrement.html">operator--</a></code></td>
<td>イテレータをデクリメントする</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_unary_plus.html">operator+</a></code></td>
<td>イテレータを進める</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_plus_assign.html">operator+=</a></code></td>
<td>イテレータ自身を進める</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_unary_minus.html">operator-</a></code></td>
<td>イテレータを逆に進める</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_minus_assign.html">operator-=</a></code></td>
<td>イテレータ自身を逆に進める</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_at.html">operator[]</a></code></td>
<td>任意の位置にランダムアクセスする</td>
<td></td>
</tr>
</tbody>
</table>
<h2>protectedメンバ変数</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>変数名</th>
<th>型</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>current</code></td>
<td><code>Iterator</code></td>
<td></td>
</tr>
</tbody>
</table>
<h2>メンバ型</h2>
<h3>C++17まで</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>iterator_type</code></td>
<td><code>Iterator</code></td>
<td></td>
</tr>
<tr>
<td><code>difference_type</code></td>
<td><code><a href="iterator_traits.html">iterator_traits</a><Iterator>::difference_type</code></td>
<td></td>
</tr>
<tr>
<td><code>pointer</code></td>
<td><code><a href="iterator_traits.html">iterator_traits</a><Iterator>::pointer</code></td>
<td></td>
</tr>
<tr>
<td><code>value_type</code></td>
<td><code><a href="iterator_traits.html">iterator_traits</a><Iterator>::value_type</code></td>
<td></td>
</tr>
<tr>
<td><code>iterator_category</code></td>
<td><code><a href="iterator_traits.html">iterator_traits</a><Iterator>::iterator_category</code></td>
<td></td>
</tr>
<tr>
<td><code>reference</code></td>
<td><code><a href="iterator_traits.html">iterator_traits</a><Iterator>::reference</code></td>
<td></td>
</tr>
</tbody>
</table>
<h3>C++20</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>iterator_type</code></td>
<td><code>Iterator</code></td>
<td></td>
</tr>
<tr>
<td><code>difference_type</code></td>
<td><code><a href="iter_difference_t.html">iter_difference_t</a><Iterator></code></td>
<td>C++20</td>
</tr>
<tr>
<td><code>pointer</code></td>
<td><code>Iterator</code></td>
<td></td>
</tr>
<tr>
<td><code>value_type</code></td>
<td><code><a href="iter_value_t.html">iter_value_t</a><Iterator></code></td>
<td>C++20</td>
</tr>
<tr>
<td><code>iterator_category</code></td>
<td><code><a href="iterator_traits.html">iterator_traits</a><Iterator>::iterator_category</code> <br /> ただし、<code><a href="iterator_tag.html">contiguous_iterator_tag</a></code>となるときは<code>random_access_iterator_tag</code></td>
<td>C++20</td>
</tr>
<tr>
<td><code>iterator_concept</code></td>
<td><code><a href="iterator_tag.html">bidirectional_iterator_tag</a></code> <br /> ただし、<code>Iterator</code>が<code><a href="random_access_iterator.html">random_access_iterator</a></code>のモデルとなるときは<code><a href="iterator_tag.html">random_access_iterator_tag</a></code></td>
<td>C++20</td>
</tr>
<tr>
<td><code>reference</code></td>
<td><code><a href="iter_reference_t.html">iter_reference_t</a><Iterator></code></td>
<td>C++20</td>
</tr>
</tbody>
</table>
<h2>非メンバ関数</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="reverse_iterator/op_equal.html">operator==</a></code></td>
<td>等値比較</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_not_equal.html">operator!=</a></code></td>
<td>非等値比較</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_less.html">operator<</a></code></td>
<td>左辺が右辺より小さいかの判定を行う</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_less_equal.html">operator<=</a></code></td>
<td>左辺が右辺以下かの判定を行う</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_greater.html">operator></a></code></td>
<td>左辺が右辺より大きいかの判定を行う</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_greater_equal.html">operator>=</a></code></td>
<td>左辺が右辺以上かの判定を行う</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_compare_3way.html">operator<=></a></code></td>
<td>三方比較を行う</td>
<td>C++20</td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_minus.html">operator-</a></code></td>
<td>2つの<code>reverse_iterator</code>の差を求める</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/op_plus.html">operator+</a></code></td>
<td>イテレータを進める</td>
<td></td>
</tr>
<tr>
<td><code><a href="reverse_iterator/iter_move.html">iter_move</a></code></td>
<td>イテレータの要素の移動</td>
<td>C++20</td>
</tr>
<tr>
<td><code><a href="reverse_iterator/iter_swap.html">iter_swap</a></code></td>
<td>イテレータの要素の交換</td>
<td>C++20</td>
</tr>
</tbody>
</table>
<h3>ヘルパ関数</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="make_reverse_iterator.html">make_reverse_iterator</a></code></td>
<td><code>reverse_iterator</code>オブジェクトを作るヘルパ関数</td>
<td>C++14</td>
</tr>
</tbody>
</table>
<h2>例</h2>
<p><div class="yata" id="aa4920d2d5d15281d86a5fb1c995731c066d34d1"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../vector.html"><vector></a></span>
<span class="cp">#include <a href="../iterator.html"><iterator></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="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="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="c1">// 逆順に走査する</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::reverse_iterator</span></span><span class="o"><</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="o">></span><span class="w"> </span><span class="n">first</span><span class="p">(</span><span class="n"><a href="../vector/vector/end.html">v.end()</a></span><span class="p">);</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::reverse_iterator</span></span><span class="o"><</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="o">></span><span class="w"> </span><span class="n">last</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"><a href="../algorithm/for_each.html">std::for_each</a></span><span class="p">(</span><span class="n">first</span><span class="p">,</span><span class="w"> </span><span class="n">last</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="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>5
4
3
2
1
</code></pre></p>
<h3>参照</h3>
<ul>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0896r4.pdf" target="_blank">P0896R4 The One Ranges Proposal (was Merging the Ranges TS)</a></li>
</ul></div>
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