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‎reference/expected/expected/op_constructor.html‎

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<p class="text-right"><small>
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最終更新日時:
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<time itemprop="datePublished" class="js-local-time"
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datetime="2026-08-08T22:56:00+09:00">
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2026年08月08日 22時56分00秒 (JST)
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2026年08月17日 00時07分22秒 (JST)
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span itemprop="name">rotarymars</span>
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<span itemprop="name">Akira Takahashi</span>
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</span>
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が更新
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</small></p>
@@ -328,6 +328,7 @@ <h2><a class="cpprefjp-defined-word" data-desc="関数等の意味論を構成
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<li>(6) : 次の制約を全て満たすこと<ul>
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<li><code><a href="../../type_traits/is_same.html">is_same_v</a>&lt;<a href="../../type_traits/remove_cvref.html">remove_cvref_t</a>&lt;U&gt;, <a href="../../utility/in_place_t.html">in_place_t</a>&gt; == false</code></li>
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<li><code><a href="../../type_traits/is_same.html">is_same_v</a>&lt;expected, <a href="../../type_traits/remove_cvref.html">remove_cvref_t</a>&lt;U&gt;&gt; == false</code></li>
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<li><code><a href="../../type_traits/is_same.html">is_same_v</a>&lt;<a href="../../type_traits/remove_cvref.html">remove_cvref_t</a>&lt;U&gt;, <a href="../unexpect_t.html">unexpect_t</a>&gt; == false</code></li>
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<li><code><a href="../../type_traits/remove_cvref.html">remove_cvref_t</a>&lt;U&gt;</code>は<code><a href="../unexpected.html">unexpected</a></code>の特殊化でない</li>
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<li><code><a href="../../type_traits/is_constructible.html">is_constructible_v</a>&lt;T, U&gt; == true</code></li>
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</ul>
@@ -552,6 +553,10 @@ <h3>処理系</h3>
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<h2>参照</h2>
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<ul>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p0323r12.html" target="_blank">P0323R12 std::expected</a></li>
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<li><a href="https://cplusplus.github.io/LWG/issue4222" target="_blank">LWG Issue 4222. <code>expected</code> constructor from a single value missing a constraint</a><ul>
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<li>C++26で、(6)の制約に<code><a href="../../type_traits/remove_cvref.html">remove_cvref_t</a>&lt;U&gt;</code>が<code><a href="../unexpect_t.html">unexpect_t</a></code>でないことが追加された</li>
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</ul>
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</li>
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</ul></div>
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‎reference/flat_map/flat_map/try_emplace.html‎

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<p class="text-right"><small>
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2026年08月08日 23時08分00秒 (JST)
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2026年08月17日 01時25分47秒 (JST)
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</time>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span itemprop="name">rotarymars</span>
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<span itemprop="name">Akira Takahashi</span>
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</span>
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が更新
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<li>
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<p>(5), (6) :
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<br />
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<div class="codehilite"><pre><span></span><code><span class="k">auto</span><span class="w"> </span><span class="n">key_it</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../../algorithm/ranges_upper_bound.html">ranges::upper_bound</a></span><span class="p">(</span><span class="n"><a href="containers.html">c.keys</a></span><span class="p">,</span><span class="w"> </span><span class="n">k</span><span class="p">,</span><span class="w"> </span><span class="n">compare</span><span class="p">);</span>
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<div class="codehilite"><pre><span></span><code><span class="k">auto</span><span class="w"> </span><span class="n">key_it</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../../algorithm/upper_bound.html">upper_bound</a></span><span class="p">(</span><span class="n"><a href="containers.html">c.keys</a></span><span class="p">.</span><span class="n"><a href="../../vector/vector/begin.html">begin()</a></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="containers.html">c.keys</a></span><span class="p">.</span><span class="n">end</span><span class="p">(),</span><span class="w"> </span><span class="n">k</span><span class="p">,</span><span class="w"> </span><span class="n">compare</span><span class="p">);</span>
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<span class="k">auto</span><span class="w"> </span><span class="n">value_it</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="containers.html">c.values</a></span><span class="p">.</span><span class="n"><a href="../../vector/vector/begin.html">begin()</a></span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n"><a href="../../iterator/distance.html">distance</a></span><span class="p">(</span><span class="n"><a href="containers.html">c.keys</a></span><span class="p">.</span><span class="n"><a href="../../vector/vector/begin.html">begin()</a></span><span class="p">,</span><span class="w"> </span><span class="n">key_it</span><span class="p">);</span>
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<span class="n"><a href="containers.html">c.keys</a></span><span class="p">.</span><span class="n"><a href="../../vector/vector/emplace.html">emplace</a></span><span class="p">(</span><span class="n">key_it</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../../utility/forward.html">std::forward</a></span><span class="o">&lt;</span><span class="n">K</span><span class="o">&gt;</span><span class="p">(</span><span class="n">k</span><span class="p">));</span>
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<span class="n"><a href="containers.html">c.values</a></span><span class="p">.</span><span class="n"><a href="../../vector/vector/emplace.html">emplace</a></span><span class="p">(</span><span class="n">value_it</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../../utility/forward.html">std::forward</a></span><span class="o">&lt;</span><span class="n">Args</span><span class="o">&gt;</span><span class="p">(</span><span class="n">args</span><span class="p">)...);</span>
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<h2>参照</h2>
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<ul>
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<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html" target="_blank">P3372R3 constexpr containers and adaptors</a></li>
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<li><a href="https://cplusplus.github.io/LWG/issue4239" target="_blank">LWG Issue 4239. <code>flat_map</code>'s transparent comparator no longer works for string literals</a><ul>
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<li>C++26で、(5), (6)の効果で範囲版<code><a href="../../algorithm/ranges_upper_bound.html">ranges::upper_bound</a></code>からイテレータ版<code><a href="../../algorithm/upper_bound.html">upper_bound</a></code>に変更された（文字列リテラルをキーとする透過的比較が機能しなくなる問題を修正）</li>
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</ul>
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</li>
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‎reference/hive/hive/erase_free.html‎

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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<li>C++26で<code>hive</code>が追加された</li>
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</ul>
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</li>
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<li><a href="https://cplusplus.github.io/LWG/issue4233" target="_blank">LWG Issue 4233. The helper lambda of <code>std::erase</code> for <code>hive</code> should specify return type as <code>bool</code></a><ul>
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<li>C++26で、テンプレートパラメータ<code>U</code>にデフォルト引数<code>= T</code>が追加され、効果のラムダに<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>型<code>-&gt; bool</code>が明示された</li>
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</ul>
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</li>
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‎reference/iterator/counted_iterator/op_equal.html‎

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<p class="text-right"><small>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">template</span><span class="o">&lt;</span><span class="n"><a href="../../concepts/common_with.html">common_with</a></span><span class="o">&lt;</span><span class="n">I</span><span class="o">&gt;</span><span class="w"> </span><span class="n">I2</span><span class="o">&gt;</span>
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<span class="k">friend</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="k">operator</span><span class="o">==</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&amp;</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&lt;</span><span class="n">I2</span><span class="o">&gt;&amp;</span><span class="w"> </span><span class="n">y</span><span class="p">);</span><span class="w"> </span><span class="c1">// (1)</span>
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<span class="k">friend</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="k">operator</span><span class="o">==</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&amp;</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../default_sentinel_t.html">default_sentinel_t</a></span><span class="p">);</span><span class="w"> </span><span class="c1">// (2)</span>
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<span class="k">friend</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="k">operator</span><span class="o">==</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&amp;</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../default_sentinel_t.html">default_sentinel_t</a></span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span><span class="w"> </span><span class="c1">// (2)</span>
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</code></pre></div>
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<h2>概要</h2>
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<p><div class="codehilite"><pre><span></span><code><span class="k">template</span><span class="o">&lt;</span><span class="n"><a href="../../concepts/common_with.html">common_with</a></span><span class="o">&lt;</span><span class="n">I</span><span class="o">&gt;</span><span class="w"> </span><span class="n">I2</span><span class="o">&gt;</span>
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<span class="k">friend</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="k">operator</span><span class="o">==</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&lt;</span><span class="n">I2</span><span class="o">&gt;&amp;</span><span class="w"> </span><span class="n">y</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&amp;</span><span class="w"> </span><span class="n">x</span><span class="p">);</span>
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<span class="k">friend</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="k">operator</span><span class="o">==</span><span class="p">(</span><span class="n"><a href="../default_sentinel_t.html">default_sentinel_t</a></span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&amp;</span><span class="w"> </span><span class="n">x</span><span class="p">);</span>
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<span class="k">friend</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="k">operator</span><span class="o">==</span><span class="p">(</span><span class="n"><a href="../default_sentinel_t.html">default_sentinel_t</a></span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&amp;</span><span class="w"> </span><span class="n">x</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
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<span class="k">template</span><span class="o">&lt;</span><span class="n"><a href="../../concepts/common_with.html">common_with</a></span><span class="o">&lt;</span><span class="n">I</span><span class="o">&gt;</span><span class="w"> </span><span class="n">I2</span><span class="o">&gt;</span>
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<span class="k">friend</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="k">operator</span><span class="o">!=</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&amp;</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&lt;</span><span class="n">I2</span><span class="o">&gt;&amp;</span><span class="w"> </span><span class="n">y</span><span class="p">);</span>
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<span class="k">friend</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="k">operator</span><span class="o">!=</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&amp;</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../default_sentinel_t.html">default_sentinel_t</a></span><span class="p">);</span><span class="w"> </span>
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<span class="k">friend</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="k">operator</span><span class="o">!=</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&amp;</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../default_sentinel_t.html">default_sentinel_t</a></span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
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<span class="k">template</span><span class="o">&lt;</span><span class="n"><a href="../../concepts/common_with.html">common_with</a></span><span class="o">&lt;</span><span class="n">I</span><span class="o">&gt;</span><span class="w"> </span><span class="n">I2</span><span class="o">&gt;</span>
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<span class="k">friend</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="k">operator</span><span class="o">!=</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&lt;</span><span class="n">I2</span><span class="o">&gt;&amp;</span><span class="w"> </span><span class="n">y</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&amp;</span><span class="w"> </span><span class="n">x</span><span class="p">);</span>
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<span class="k">friend</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="k">operator</span><span class="o">!=</span><span class="p">(</span><span class="n"><a href="../default_sentinel_t.html">default_sentinel_t</a></span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&amp;</span><span class="w"> </span><span class="n">x</span><span class="p">);</span>
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<span class="k">friend</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="k">operator</span><span class="o">!=</span><span class="p">(</span><span class="n"><a href="../default_sentinel_t.html">default_sentinel_t</a></span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">counted_iterator</span><span class="o">&amp;</span><span class="w"> </span><span class="n">x</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
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</code></pre></div>
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</p>
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<p>また、これらの演算子は全て<a href="../../../article/lib/hidden_friends.html"><em>Hidden friends</em></a>として定義される。</p>
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<h2>参照</h2>
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<ul>
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<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>
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<li><a href="https://cplusplus.github.io/LWG/issue4245" target="_blank">LWG Issue 4245. Operators that interact with <code>counted_iterator</code> and <code>default_sentinel_t</code> should be <code>noexcept</code></a><ul>
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<li>C++26で、(2)（および<code>default_sentinel_t</code>と相互作用する派生演算子）に<code>noexcept</code>が追加された</li>
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</ul>
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</li>
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</ul></div>
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