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reference/algorithm/ranges_remove_copy.html

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@@ -68,7 +68,7 @@
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</head>
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<body>
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;algorithm&#34;], &#34;namespace&#34;: [&#34;std::ranges&#34;], &#34;id-type&#34;: [&#34;function template&#34;], &#34;cpp&#34;: [&#34;cpp20&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;766c4224ae1573936005c31ade6bcdda973dd836&#34;, &#34;source&#34;: &#34;#include &lt;algorithm&gt;\n#include &lt;iostream&gt;\n#include &lt;vector&gt;\n#include &lt;iterator&gt;\n\nint main() {\n std::vector&lt;int&gt; v = { 2,3,1,2,1 };\n\n // 1 \u3092\u9664\u53bb\u3057\u305f\u7d50\u679c\u3092\u51fa\u529b\u3059\u308b\n std::ranges::remove_copy(v, std::ostream_iterator&lt;int&gt;(std::cout, \&#34;,\&#34;), 1);\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;algorithm&#34;, &#34;ranges_remove_copy&#34;]}">
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;algorithm&#34;], &#34;namespace&#34;: [&#34;std::ranges&#34;], &#34;id-type&#34;: [&#34;function template&#34;], &#34;cpp&#34;: [&#34;cpp20&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;766c4224ae1573936005c31ade6bcdda973dd836&#34;, &#34;source&#34;: &#34;#include &lt;algorithm&gt;\n#include &lt;iostream&gt;\n#include &lt;vector&gt;\n#include &lt;iterator&gt;\n\nint main() {\n std::vector&lt;int&gt; v = { 2,3,1,2,1 };\n\n // 1 \u3092\u9664\u53bb\u3057\u305f\u7d50\u679c\u3092\u51fa\u529b\u3059\u308b\n std::ranges::remove_copy(v, std::ostream_iterator&lt;int&gt;(std::cout, \&#34;,\&#34;), 1);\n}\n&#34;}, {&#34;id&#34;: &#34;ca1eee6e847653c5f671afb6fee9f51e3908de4d&#34;, &#34;source&#34;: &#34;#include &lt;algorithm&gt;\n#include &lt;iostream&gt;\n#include &lt;vector&gt;\n#include &lt;iterator&gt;\n\nstruct Point {\n int x;\n int y;\n\n bool operator==(const Point&amp; other) const = default;\n};\n\nstd::ostream&amp; operator&lt;&lt;(std::ostream&amp; os, const Point&amp; p) {\n return os &lt;&lt; p.x &lt;&lt; \&#34;,\&#34; &lt;&lt; p.y;\n}\n\nint main() {\n std::vector&lt;Point&gt; v = {\n {1, 2},\n {3, 4},\n {5, 6},\n {1, 2},\n };\n\n // \u5024{1, 2}\u3092\u9664\u53bb\u3057\u305f\u7d50\u679c\u3092\u51fa\u529b\u3059\u308b\n std::ranges::remove_copy(\n v,\n std::ostream_iterator&lt;Point&gt;(std::cout, \&#34;\\n\&#34;),\n {1, 2}\n );\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;algorithm&#34;, &#34;ranges_remove_copy&#34;]}">
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<nav class="navbar navbar-default" role="navigation">
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<div class="container-fluid">
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<div class="navbar-header">
@@ -188,8 +188,8 @@
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<p class="text-right"><small>
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2024-06-11T13:45:38">
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2024年06月11日 13時45分38秒
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<span itemprop="datePublished" content="2025-05-27T05:13:34">
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2025年05月27日 05時13分34秒
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</span>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
@@ -231,6 +231,23 @@
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<span class="n">O</span> <span class="n">result</span><span class="p">,</span>
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<span class="k">const</span> <span class="n">T</span><span class="o">&amp;</span> <span class="n">value</span><span class="p">,</span>
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<span class="n">Proj</span> <span class="n">proj</span> <span class="o">=</span> <span class="p">{});</span> <span class="c1">// (1) C++20</span>
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<span class="k">template</span> <span class="o">&lt;</span><span class="n"><a href="../iterator/input_iterator.html">input_iterator</a></span> <span class="n">I</span><span class="p">,</span>
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<span class="n"><a href="../iterator/sentinel_for.html">sentinel_for</a></span><span class="o">&lt;</span><span class="n">I</span><span class="o">&gt;</span> <span class="n">S</span><span class="p">,</span>
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<span class="n"><a href="../iterator/weakly_incrementable.html">weakly_incrementable</a></span> <span class="n">O</span><span class="p">,</span>
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<span class="k">class</span> <span class="nc">Proj</span> <span class="o">=</span> <span class="n"><a href="../functional/identity.html">identity</a></span><span class="p">,</span>
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<span class="k">class</span> <span class="nc">T</span> <span class="o">=</span> <span class="n"><a href="../iterator/projected_value_t.html">projected_value_t</a></span><span class="o">&lt;</span><span class="n">I</span><span class="p">,</span> <span class="n">Proj</span><span class="o">&gt;&gt;</span>
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<span class="n">requires</span> <span class="n"><a href="../iterator/indirectly_copyable.html">indirectly_copyable</a></span><span class="o">&lt;</span><span class="n">I</span><span class="p">,</span> <span class="n">O</span><span class="o">&gt;</span> <span class="o">&amp;&amp;</span>
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<span class="n"><a href="../iterator/indirect_binary_predicate.html">indirect_binary_predicate</a></span><span class="o">&lt;</span>
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<span class="n"><a href="../functional/ranges_equal_to.html">ranges::equal_to</a></span><span class="p">,</span>
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<span class="n"><a href="../iterator/projected.html">projected</a></span><span class="o">&lt;</span><span class="n">I</span><span class="p">,</span> <span class="n">Proj</span><span class="o">&gt;</span><span class="p">,</span>
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<span class="k">const</span> <span class="n">T</span><span class="o">*</span>
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<span class="o">&gt;</span>
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<span class="k">constexpr</span> <span class="n"><a href="ranges_in_out_result.html">remove_copy_result</a></span><span class="o">&lt;</span><span class="n">I</span><span class="p">,</span> <span class="n">O</span><span class="o">&gt;</span>
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<span class="n">remove_copy</span><span class="p">(</span><span class="n">I</span> <span class="n">first</span><span class="p">,</span>
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<span class="n">S</span> <span class="n">last</span><span class="p">,</span>
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<span class="n">O</span> <span class="n">result</span><span class="p">,</span>
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<span class="k">const</span> <span class="n">T</span><span class="o">&amp;</span> <span class="n">value</span><span class="p">,</span>
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<span class="n">Proj</span> <span class="n">proj</span> <span class="o">=</span> <span class="p">{});</span> <span class="c1">// (1) C++26</span>
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<span class="k">template</span> <span class="o">&lt;</span><span class="n"><a href="../ranges/input_range.html">input_range</a></span> <span class="n">R</span><span class="p">,</span>
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<span class="n"><a href="../iterator/weakly_incrementable.html">weakly_incrementable</a></span> <span class="n">O</span><span class="p">,</span>
@@ -247,6 +264,21 @@
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<span class="n">O</span> <span class="n">result</span><span class="p">,</span>
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<span class="k">const</span> <span class="n">T</span><span class="o">&amp;</span> <span class="n">value</span><span class="p">,</span>
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<span class="n">Proj</span> <span class="n">proj</span> <span class="o">=</span> <span class="p">{});</span> <span class="c1">// (2) C++20</span>
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<span class="k">template</span> <span class="o">&lt;</span><span class="n"><a href="../ranges/input_range.html">input_range</a></span> <span class="n">R</span><span class="p">,</span>
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<span class="n"><a href="../iterator/weakly_incrementable.html">weakly_incrementable</a></span> <span class="n">O</span><span class="p">,</span>
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<span class="k">class</span> <span class="nc">Proj</span> <span class="o">=</span> <span class="n"><a href="../functional/identity.html">identity</a></span><span class="p">,</span>
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<span class="k">class</span> <span class="nc">T</span> <span class="o">=</span> <span class="n"><a href="../iterator/projected_value_t.html">projected_value_t</a></span><span class="o">&lt;</span><span class="n"><a href="../ranges/iterator_t.html">iterator_t</a></span><span class="o">&lt;</span><span class="n">R</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">Proj</span><span class="o">&gt;&gt;</span>
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<span class="n">requires</span> <span class="n"><a href="../iterator/indirectly_copyable.html">indirectly_copyable</a></span><span class="o">&lt;</span><span class="n"><a href="../ranges/iterator_t.html">iterator_t</a></span><span class="o">&lt;</span><span class="n">R</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">O</span><span class="o">&gt;</span> <span class="o">&amp;&amp;</span>
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<span class="n"><a href="../iterator/indirect_binary_predicate.html">indirect_binary_predicate</a></span><span class="o">&lt;</span>
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<span class="n"><a href="../functional/ranges_equal_to.html">ranges::equal_to</a></span><span class="p">,</span>
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<span class="n"><a href="../iterator/projected.html">projected</a></span><span class="o">&lt;</span><span class="n"><a href="../ranges/iterator_t.html">iterator_t</a></span><span class="o">&lt;</span><span class="n">R</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">Proj</span><span class="o">&gt;</span><span class="p">,</span>
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<span class="k">const</span> <span class="n">T</span><span class="o">*</span>
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<span class="o">&gt;</span>
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<span class="k">constexpr</span> <span class="n"><a href="ranges_in_out_result.html">remove_copy_result</a></span><span class="o">&lt;</span><span class="n"><a href="../ranges/borrowed_iterator_t.html">borrowed_iterator_t</a></span><span class="o">&lt;</span><span class="n">R</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">O</span><span class="o">&gt;</span>
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<span class="n">remove_copy</span><span class="p">(</span><span class="n">R</span><span class="o">&amp;&amp;</span> <span class="n">r</span><span class="p">,</span>
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<span class="n">O</span> <span class="n">result</span><span class="p">,</span>
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<span class="k">const</span> <span class="n">T</span><span class="o">&amp;</span> <span class="n">value</span><span class="p">,</span>
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<span class="n">Proj</span> <span class="n">proj</span> <span class="o">=</span> <span class="p">{});</span> <span class="c1">// (2) C++26</span>
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<span class="p">}</span>
251283
</code></pre></div>
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</p>
@@ -267,8 +299,20 @@ <h2><a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価
267299
<h2><a class="cpprefjp-defined-word" data-desc="関数等の意味論を構成する要素の1つ。Complexity。関数が使うアルゴリズムの空間計算量・時間計算量">計算量</a></h2>
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<p>正確に <code>last - first</code> 回の比較を行う</p>
269301
<h2>備考</h2>
270-
<p>安定。</p>
302+
<ul>
303+
<li>安定。</li>
304+
<li>(1), (2) :<ul>
305+
<li>C++26 : 引数として波カッコ初期化<code>{}</code>を受け付ける
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<br />
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<div class="codehilite"><pre><span></span><code><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span> <span class="n">v</span><span class="p">;</span>
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<span class="n">std</span><span class="o">::</span><span class="n">ranges</span><span class="o">::</span><span class="n">remove_copy</span><span class="p">(</span><span class="n">v</span><span class="p">,</span> <span class="n">result</span><span class="p">,</span> <span class="p">{</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">});</span>
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</code></pre></div>
310+
</li>
311+
</ul>
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</li>
313+
</ul>
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<h2></h2>
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<h3>基本的な使い方</h3>
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<p><div class="yata" id="766c4224ae1573936005c31ade6bcdda973dd836"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../algorithm.html">&lt;algorithm&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../iostream.html">&lt;iostream&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../vector.html">&lt;vector&gt;</a></span><span class="cp"></span>
@@ -282,9 +326,47 @@ <h2>例</h2>
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<span class="p">}</span>
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</code></pre></div>
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</div></p>
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<h3>出力</h3>
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<h4>出力</h4>
286330
<p><pre><code>2,3,2,
287331
</code></pre></p>
332+
<h3>波カッコ初期化を入力として使用する (C++26)</h3>
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<p><div class="yata" id="ca1eee6e847653c5f671afb6fee9f51e3908de4d"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../algorithm.html">&lt;algorithm&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../iostream.html">&lt;iostream&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../vector.html">&lt;vector&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../iterator.html">&lt;iterator&gt;</a></span><span class="cp"></span>
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<span class="k">struct</span> <span class="n">Point</span> <span class="p">{</span>
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<span class="kt">int</span> <span class="n">x</span><span class="p">;</span>
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<span class="kt">int</span> <span class="n">y</span><span class="p">;</span>
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<span class="kt">bool</span> <span class="k">operator</span><span class="o">==</span><span class="p">(</span><span class="k">const</span> <span class="n">Point</span><span class="o">&amp;</span> <span class="n">other</span><span class="p">)</span> <span class="k">const</span> <span class="o">=</span> <span class="k">default</span><span class="p">;</span>
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<span class="p">};</span>
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<span class="n">std</span><span class="o">::</span><span class="n">ostream</span><span class="o">&amp;</span> <span class="k">operator</span><span class="o">&lt;&lt;</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">ostream</span><span class="o">&amp;</span> <span class="n">os</span><span class="p">,</span> <span class="k">const</span> <span class="n">Point</span><span class="o">&amp;</span> <span class="n">p</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">return</span> <span class="n">os</span> <span class="o">&lt;&lt;</span> <span class="n">p</span><span class="p">.</span><span class="n">x</span> <span class="o">&lt;&lt;</span> <span class="s">","</span> <span class="o">&lt;&lt;</span> <span class="n">p</span><span class="p">.</span><span class="n">y</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="kt">int</span> <span class="n">main</span><span class="p">()</span> <span class="p">{</span>
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<span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o">&lt;</span><span class="n">Point</span><span class="o">&gt;</span> <span class="n">v</span> <span class="o">=</span> <span class="p">{</span>
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<span class="p">{</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">},</span>
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<span class="p">{</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">},</span>
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<span class="p">{</span><span class="mi">5</span><span class="p">,</span> <span class="mi">6</span><span class="p">},</span>
354+
<span class="p">{</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">},</span>
355+
<span class="p">};</span>
356+
357+
<span class="c1">// 値{1, 2}を除去した結果を出力する</span>
358+
<span class="n"><span style="color:#ff0000">std::ranges::remove_copy</span></span><span class="p">(</span>
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<span class="n">v</span><span class="p">,</span>
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<span class="n"><a href="../iterator/ostream_iterator.html">std::ostream_iterator</a></span><span class="o">&lt;</span><span class="n">Point</span><span class="o">&gt;</span><span class="p">(</span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="p">,</span> <span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">),</span>
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<span class="p">{</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">}</span>
362+
<span class="p">);</span>
363+
<span class="p">}</span>
364+
</code></pre></div>
365+
</div></p>
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<h4>出力</h4>
367+
<p><pre><code>3,4
368+
5,6
369+
</code></pre></p>
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<h2>バージョン</h2>
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<h3>言語</h3>
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<ul>
@@ -300,6 +382,10 @@ <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://timsong-cpp.github.io/cppwp/n4861/algorithms" target="_blank">N4861 25 Algorithms library</a></li>
385+
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2024/p2248r8.html" target="_blank">P2248R8 Enabling list-initialization for algorithms</a><ul>
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<li>C++26で波カッコ初期化 (リスト初期化) に対応した</li>
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</ul>
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</li>
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</ul></div>
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</div>

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