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<div class="identifier-type">concept</div><div class="header"><iterator></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">contiguous_iterator</span><span class="cpp cpp20" title="C++20で追加">(C++20)</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="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">I</span><span class="o">></span>
<span class="w"> </span><span class="k">concept</span><span class="w"> </span><span class="nc"><a href="">contiguous_iterator</a></span><span class="w"> </span><span class="o">=</span>
<span class="w"> </span><span class="n"><a href="random_access_iterator.html">random_access_iterator</a></span><span class="o"><</span><span class="n">I</span><span class="o">></span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span><span class="n"><a href="../concepts/derived_from.html">derived_from</a></span><span class="o"><</span><span class="n"><a href="input_iterator.html#iter_concept">ITER_CONCEPT</a></span><span class="p">(</span><span class="n">I</span><span class="p">),</span><span class="w"> </span><span class="n"><a href="iterator_tag.html">contiguous_iterator_tag</a></span><span class="o">></span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span><span class="n"><a href="../type_traits/is_lvalue_reference.html">is_lvalue_reference_v</a></span><span class="o"><</span><span class="n"><a href="iter_reference_t.html">iter_reference_t</a></span><span class="o"><</span><span class="n">I</span><span class="o">>></span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span><span class="n"><a href="../concepts/same_as.html">same_as</a></span><span class="o"><</span><span class="n"><a href="iter_value_t.html">iter_value_t</a></span><span class="o"><</span><span class="n">I</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../type_traits/remove_cvref.html">remove_cvref_t</a></span><span class="o"><</span><span class="n"><a href="iter_reference_t.html">iter_reference_t</a></span><span class="o"><</span><span class="n">I</span><span class="o">>>></span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span><span class="k">requires</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">I</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="p">{</span><span class="w"> </span><span class="n"><a href="../memory/to_address.html">to_address</a></span><span class="p">(</span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n"><a href="../concepts/same_as.html">same_as</a></span><span class="o"><</span><span class="n"><a href="../type_traits/add_pointer.html">add_pointer_t</a></span><span class="o"><</span><span class="n"><a href="iter_reference_t.html">iter_reference_t</a></span><span class="o"><</span><span class="n">I</span><span class="o">>>></span><span class="p">;</span>
<span class="w"> </span><span class="p">};</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>contiguous_iterator</code>は、イテレータ型<code>I</code>が隣接イテレータであることを表すコンセプトである。</p>
<p><code>contiguous_iterator</code>となるイテレータは、<a href="random_access_iterator.html">ランダムアクセスイテレータ</a>であり、参照する要素列がメモリ上で連続していることが保証される。</p>
<p>C++20で導入された<code>contiguous_iterator</code>は、要素がメモリー上で連続していることを保証しているが、C++23の標準ライブラリ実装では
得られたポインタに対してさらなるポインタ演算を行う演算は許可されていなかった。</p>
<p>しかし、C++26からは、この制限が緩和され、<code>std::to_address</code>関数を使用して得られたポインタに対してさらなるポインタ演算を行うことができるようになった。</p>
<h2>モデル</h2>
<p><code>a, b</code>を間接参照可能なイテレータ、<code>c</code>を間接参照不可能なイテレータとし、<code>b</code>は<code>a</code>から、<code>c</code>は<code>b</code>からそれぞれ到達可能であるとする。そのような型<code>I</code>のイテレータ<code>a, b, c</code>と<code><a href="iter_difference_t.html">iter_difference_t<I></a></code>の示す型<code>D</code>について次の条件を満たす場合に限って、型<code>I</code>は<code>contiguous_iterator</code>のモデルである。</p>
<h2>要件</h2>
<ul>
<li><code><a href="iter_move.html">ranges::iter_move</a>(a)</code>は、<code>std::move(*a)</code>と同じ型・値カテゴリ・効果を持つ</li>
<li><code><a href="iter_swap.html">ranges::iter_swap</a>(a, b)</code>が<a class="cpprefjp-defined-word" data-desc="プログラムが文法規則・診断対象の意味規則・単一定義規則を満たすこと" href="../../implementation-compliance.html#dfn-well-formed">適格</a>である場合、その効果は<code><a href="../concepts/swap.html">ranges::swap</a>(*a, *b)</code>と等価である</li>
<li>C++26: このイテレータの範囲<code>[i, s)</code>はポインタ範囲<code>[to_address(i), to_address(i + ranges::distance(i, s)))</code>に置き換えて使用することが実装に許可される<ul>
<li>注:このイテレータをアルゴリズム適用した場合、イテレータのインクリメントが一回しか起こらない可能性があり、個々のインクリメントに対して副作用を起こすことを期待してはならない</li>
<li>備考:連続イテレータの範囲に対する操作として、<code>std::copy()</code>の実装が<code><a href="../cstring/memmove.html">std::memmove()</a></code>の呼び出しで完了するなど、イテレータを一つずつ進めるのではなくメモリ操作で高速実装されることを許可するものである</li>
</ul>
</li>
</ul>
<h2>例</h2>
<p><div class="yata" id="2516e7bc3757fab165bcd4a6a32afed19c8caf76"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../concepts.html"><concepts></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="cp">#include <a href="../forward_list.html"><forward_list></a></span>
<span class="cp">#include <a href="../list.html"><list></a></span>
<span class="cp">#include <a href="../deque.html"><deque></a></span>
<span class="k">template</span><span class="o"><</span><span class="n"><span style="color:#ff0000">std::contiguous_iterator</span></span><span class="w"> </span><span class="n">I</span><span class="o">></span>
<span class="kt">void</span><span class="w"> </span><span class="n">f</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">name</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">name</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">" is <a href="">contiguous_iterator</a>"</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="p">}</span>
<span class="k">template</span><span class="o"><</span><span class="k">typename</span><span class="w"> </span><span class="nc">I</span><span class="o">></span>
<span class="kt">void</span><span class="w"> </span><span class="n">f</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">name</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">name</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">" is not <a href="">contiguous_iterator</a>"</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="p">}</span>
<span class="kt">int</span><span class="w"> </span><span class="n">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="kt">int</span><span class="o">*></span><span class="p">(</span><span class="s">"int*"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="o">*></span><span class="p">(</span><span class="s">"const int*"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</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="n">iterator</span><span class="o">></span><span class="p">(</span><span class="s">"<a href="../vector/vector.html">std::vector</a><int>::iterator"</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="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="kt">int</span><span class="o">*</span><span class="w"> </span><span class="k">const</span><span class="o">></span><span class="p">(</span><span class="s">"int* const"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="n"><a href="../forward_list/forward_list.html">std::forward_list</a></span><span class="o"><</span><span class="kt">int</span><span class="o">>::</span><span class="n">iterator</span><span class="o">></span><span class="p">(</span><span class="s">"<a href="../forward_list/forward_list.html">std::forward_list</a><int>::iterator"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="n"><a href="../list/list.html">std::list</a></span><span class="o"><</span><span class="kt">int</span><span class="o">>::</span><span class="n">iterator</span><span class="o">></span><span class="p">(</span><span class="s">"<a href="../list/list.html">std::list</a><int>::iterator"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="n"><a href="../deque/deque.html">std::deque</a></span><span class="o"><</span><span class="kt">int</span><span class="o">>::</span><span class="n">iterator</span><span class="o">></span><span class="p">(</span><span class="s">"<a href="../deque/deque.html">std::deque</a><int>::iterator"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="n">std</span><span class="o">::</span><span class="n">istream_iterator</span><span class="o"><</span><span class="kt">double</span><span class="o">>></span><span class="p">(</span><span class="s">"std::istream_iterator<double>"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="n"><a href="ostream_iterator.html">std::ostream_iterator</a></span><span class="o"><</span><span class="kt">double</span><span class="o">>></span><span class="p">(</span><span class="s">"<a href="ostream_iterator.html">std::ostream_iterator</a><double>"</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>int* is <a href="">contiguous_iterator</a>
const int* is <a href="">contiguous_iterator</a>
<a href="../vector/vector.html">std::vector</a><int>::iterator is <a href="">contiguous_iterator</a>
int* const is not <a href="">contiguous_iterator</a>
<a href="../forward_list/forward_list.html">std::forward_list</a><int>::iterator is not <a href="">contiguous_iterator</a>
<a href="../list/list.html">std::list</a><int>::iterator is not <a href="">contiguous_iterator</a>
<a href="../deque/deque.html">std::deque</a><int>::iterator is not <a href="">contiguous_iterator</a>
std::istream_iterator<double> is not <a href="">contiguous_iterator</a>
<a href="ostream_iterator.html">std::ostream_iterator</a><double> is not <a href="">contiguous_iterator</a>
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++20</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: 13.0.1 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#gcc">GCC</a>: 10.1 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2019 Update 6 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
</ul>
<h2>関連項目</h2>
<ul>
<li><a href="../../lang/cpp20/concepts.html">C++20 コンセプト</a></li>
</ul>
<h2>参照</h2>
<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>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1474r1.pdf" target="_blank">P1474R1 Helpful pointers for <code>ContiguousIterator</code></a></li>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3349r1.html" target="_blank">P3349R1 Converting contiguous iterators to pointers</a></li>
<li><a href="https://cplusplus.github.io/LWG/issue3607" target="_blank">LWG Issue 3607. <code>contiguous_iterator</code> should not be allowed to have custom <code>iter_move</code> and <code>iter_swap</code> behavior</a><ul>
<li>C++23で、<code>ranges::iter_move</code>・<code>ranges::iter_swap</code>がデフォルトの挙動と一致することがモデル要件に追加された</li>
</ul>
</li>
<li><a href="https://cplusplus.github.io/LWG/issue4170" target="_blank">LWG Issue 4170. <code>contiguous_iterator</code> should require <code>to_address(I{})</code></a><ul>
<li>C++26で、<code>to_address</code>を要求する<code>requires</code>式の対象が<code>const I&</code>であることが整理された(cpprefjpの記述はもともとこの形と一致している)</li>
</ul>
</li>
</ul></div>
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