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<header data-kunai-mdinfo="{"meta": {"header": ["iterator"], "namespace": ["std"], "id-type": ["type-alias"], "cpp": ["cpp23"]}, "sources": [{"id": "197c7f3ff092fe8fcac763a0ac321f9bddf7884a", "source": "#include <iterator>\n#include <tuple>\n\n// indirectly_readable\u3068\u306a\u308b\u6700\u4f4e\u9650\u306e\u578b\n// R\u304c\u53c2\u7167\u578b\u3001V\u304c\u5024\u578b\u3068\u306a\u308b\ntemplate<typename R, typename V>\nstruct test_indirectly_readable {\n using value_type = V;\n using difference = std::ptrdiff_t;\n\n auto operator*() const -> R;\n};\n\nint main() {\n static_assert(std::same_as<std::iter_const_reference_t<test_indirectly_readable<int& , int>>, const int&>);\n static_assert(std::same_as<std::iter_const_reference_t<test_indirectly_readable<int&& , int>>, const int&&>);\n static_assert(std::same_as<std::iter_const_reference_t<test_indirectly_readable<const int& , int>>, const int&>);\n static_assert(std::same_as<std::iter_const_reference_t<test_indirectly_readable<const int&&, int>>, const int&&>);\n static_assert(std::same_as<std::iter_const_reference_t<test_indirectly_readable<int , int>>, int>);\n static_assert(std::same_as<std::iter_const_reference_t<test_indirectly_readable<const int , int>>, int>);\n\n static_assert(std::same_as<std::iter_const_reference_t<test_indirectly_readable<std::tuple<int, double> , std::tuple<int, double>>>, std::tuple<int, double>>);\n static_assert(std::same_as<std::iter_const_reference_t<test_indirectly_readable<std::tuple<int&, double&>, std::tuple<int, double>>>, std::tuple<const int&, const double&>>);\n static_assert(std::same_as<std::iter_const_reference_t<test_indirectly_readable<std::tuple<int, double>& , std::tuple<int, double>>>, const std::tuple<int, double>&>);\n}\n"}], "page_id": ["reference", "iterator", "iter_const_reference_t"]}">
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最終更新日時(UTC):
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2025年07月08日 15時33分39秒
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<div class="identifier-type">type-alias</div><div class="header"><iterator></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">iter_const_reference_t</span><span class="cpp cpp23" title="C++23で追加">(C++23)</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="n"><a href="indirectly_readable.html">indirectly_readable</a></span><span class="w"> </span><span class="n">It</span><span class="o">></span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">iter_const_reference_t</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../type_traits/common_reference.html">common_reference_t</a></span><span class="o"><</span><span class="k">const</span><span class="w"> </span><span class="n"><a href="iter_value_t.html">iter_value_t</a></span><span class="o"><</span><span class="n">It</span><span class="o">>&&</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="iter_reference_t.html">iter_reference_t</a></span><span class="o"><</span><span class="n">It</span><span class="o">>></span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>任意のイテレータ型<code>It</code>から、そのイテレータの要素への<code>const</code>参照型を取得する。</p>
<h2>型の決定</h2>
<p><code>iter_value_t<It></code>が非参照型であり<code>iter_reference_t<It></code>から修飾を除いた型であるとすると、<code>iter_reference_t<It></code>に対して<code>iter_const_reference_t<It></code>は基本的には次のようになる（<code>T</code>を任意の修飾なしの型とする）</p>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th><code>iter_reference_t<It></code></th>
<th><code>iter_const_reference_t<It></code></th>
</tr>
</thead>
<tbody>
<tr>
<td><code>T&</code></td>
<td><code>const T&</code></td>
</tr>
<tr>
<td><code>T&&</code></td>
<td><code>const T&&</code></td>
</tr>
<tr>
<td><code>const T&</code></td>
<td><code>const T&</code></td>
</tr>
<tr>
<td><code>const T&&</code></td>
<td><code>const T&&</code></td>
</tr>
<tr>
<td><code>T</code></td>
<td><code>T</code></td>
</tr>
<tr>
<td><code>const T</code></td>
<td><code>T</code></td>
</tr>
</tbody>
</table>
<p><code>iter_value_t<It></code>に対して<code>iter_reference_t<It></code>が修飾以外も異なる型となる場合や、<code>It</code>に対して<code>iterator_traits</code>の特殊化が存在する場合、<code>const iter_value_t<It>&&</code>と<code>iter_reference_t<It></code>について<code>common_reference</code>が特殊化されている場合などはこれと異なる結果となりうる。標準ライブラリにあるそのようなイテレータ型を持つものについて一部例を示すと、次のようになる</p>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th><code>It</code>の取得元の範囲</th>
<th><code>iter_value_t<It></code></th>
<th><code>iter_reference_t<It></code></th>
<th><code>iter_const_reference_t<It></code></th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="../vector/vector.html">std::vector<bool></a></code></td>
<td><code>bool</code></td>
<td><code>std::vector<bool>::reference</code></td>
<td><code>bool</code></td>
</tr>
<tr>
<td><code>const std::vector<bool></code></td>
<td><code>bool</code></td>
<td><code>bool</code></td>
<td><code>bool</code></td>
</tr>
<tr>
<td><code><a href="../ranges/zip_view.html">views::zip</a></code></td>
<td><code>std::tuple<T, U></code></td>
<td><code>std::tuple<T&, U&></code></td>
<td><code>std::tuple<const T&, const D&></code></td>
</tr>
<tr>
<td><code><a href="../ranges/enumerate_view.html">views::enumerate</a></code></td>
<td><code>std::tuple<D, T></code></td>
<td><code>std::tuple<D, T&></code></td>
<td><code>std::tuple<D, const T&></code></td>
</tr>
</tbody>
</table>
<p>表中の<code>T, U</code>はそれそれの<code>view</code>に入力された範囲の値型、<code>D</code>は<code>views::enumerate</code>の入力範囲の<code>iter_difference_t</code>とする。</p>
<h2>例</h2>
<p><div class="yata" id="197c7f3ff092fe8fcac763a0ac321f9bddf7884a"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iterator.html"><iterator></a></span>
<span class="cp">#include <a href="../tuple.html"><tuple></a></span>
<span class="c1">// indirectly_readableとなる最低限の型</span>
<span class="c1">// Rが参照型、Vが値型となる</span>
<span class="k">template</span><span class="o"><</span><span class="k">typename</span><span class="w"> </span><span class="nc">R</span><span class="p">,</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">V</span><span class="o">></span>
<span class="k">struct</span><span class="w"> </span><span class="nc">test_indirectly_readable</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">value_type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">V</span><span class="p">;</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">difference</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="kt">ptrdiff_t</span><span class="p">;</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="k">operator</span><span class="o">*</span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">R</span><span class="p">;</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="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n"><a href="../concepts/same_as.html">same_as</a></span><span class="o"><</span><span class="n"><span style="color:#ff0000">std::iter_const_reference_t</span></span><span class="o"><</span><span class="n">test_indirectly_readable</span><span class="o"><</span><span class="kt">int</span><span class="o">&</span><span class="w"> </span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">>></span><span class="p">,</span><span class="w"> </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="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n"><a href="../concepts/same_as.html">same_as</a></span><span class="o"><</span><span class="n"><span style="color:#ff0000">std::iter_const_reference_t</span></span><span class="o"><</span><span class="n">test_indirectly_readable</span><span class="o"><</span><span class="kt">int</span><span class="o">&&</span><span class="w"> </span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">>></span><span class="p">,</span><span class="w"> </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="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n"><a href="../concepts/same_as.html">same_as</a></span><span class="o"><</span><span class="n"><span style="color:#ff0000">std::iter_const_reference_t</span></span><span class="o"><</span><span class="n">test_indirectly_readable</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="w"> </span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">>></span><span class="p">,</span><span class="w"> </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="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n"><a href="../concepts/same_as.html">same_as</a></span><span class="o"><</span><span class="n"><span style="color:#ff0000">std::iter_const_reference_t</span></span><span class="o"><</span><span class="n">test_indirectly_readable</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="w"> </span><span class="kt">int</span><span class="o">>></span><span class="p">,</span><span class="w"> </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="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n"><a href="../concepts/same_as.html">same_as</a></span><span class="o"><</span><span class="n"><span style="color:#ff0000">std::iter_const_reference_t</span></span><span class="o"><</span><span class="n">test_indirectly_readable</span><span class="o"><</span><span class="kt">int</span><span class="w"> </span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">>></span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">></span><span class="p">);</span>
<span class="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n"><a href="../concepts/same_as.html">same_as</a></span><span class="o"><</span><span class="n"><span style="color:#ff0000">std::iter_const_reference_t</span></span><span class="o"><</span><span class="n">test_indirectly_readable</span><span class="o"><</span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">>></span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">></span><span class="p">);</span>
<span class="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n"><a href="../concepts/same_as.html">same_as</a></span><span class="o"><</span><span class="n"><span style="color:#ff0000">std::iter_const_reference_t</span></span><span class="o"><</span><span class="n">test_indirectly_readable</span><span class="o"><</span><span class="n"><a href="../tuple/tuple.html">std::tuple</a></span><span class="o"><</span><span class="kt">int</span><span class="p">,</span><span class="w"> </span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../tuple/tuple.html">std::tuple</a></span><span class="o"><</span><span class="kt">int</span><span class="p">,</span><span class="w"> </span><span class="kt">double</span><span class="o">>>></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../tuple/tuple.html">std::tuple</a></span><span class="o"><</span><span class="kt">int</span><span class="p">,</span><span class="w"> </span><span class="kt">double</span><span class="o">>></span><span class="p">);</span>
<span class="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n"><a href="../concepts/same_as.html">same_as</a></span><span class="o"><</span><span class="n"><span style="color:#ff0000">std::iter_const_reference_t</span></span><span class="o"><</span><span class="n">test_indirectly_readable</span><span class="o"><</span><span class="n"><a href="../tuple/tuple.html">std::tuple</a></span><span class="o"><</span><span class="kt">int</span><span class="o">&</span><span class="p">,</span><span class="w"> </span><span class="kt">double</span><span class="o">&></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../tuple/tuple.html">std::tuple</a></span><span class="o"><</span><span class="kt">int</span><span class="p">,</span><span class="w"> </span><span class="kt">double</span><span class="o">>>></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../tuple/tuple.html">std::tuple</a></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="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">double</span><span class="o">&>></span><span class="p">);</span>
<span class="w"> </span><span class="k">static_assert</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n"><a href="../concepts/same_as.html">same_as</a></span><span class="o"><</span><span class="n"><span style="color:#ff0000">std::iter_const_reference_t</span></span><span class="o"><</span><span class="n">test_indirectly_readable</span><span class="o"><</span><span class="n"><a href="../tuple/tuple.html">std::tuple</a></span><span class="o"><</span><span class="kt">int</span><span class="p">,</span><span class="w"> </span><span class="kt">double</span><span class="o">>&</span><span class="w"> </span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../tuple/tuple.html">std::tuple</a></span><span class="o"><</span><span class="kt">int</span><span class="p">,</span><span class="w"> </span><span class="kt">double</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="../tuple/tuple.html">std::tuple</a></span><span class="o"><</span><span class="kt">int</span><span class="p">,</span><span class="w"> </span><span class="kt">double</span><span class="o">>&></span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code></code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++23</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: ??</li>
<li><a href="../../implementation.html#gcc">GCC</a>: 13.1 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2022 Update 6 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2278r4.html" target="_blank">P2278R4 <code>cbegin</code> should always return a constant iterator</a></li>
</ul></div>
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