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‎lang/cpp17/constexpr_lambda.html‎

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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>
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<span itemprop="name">Akira Takahashi</span>
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<span itemprop="name">Raclamusi</span>
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</span>
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</small></p>
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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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<p><pre><code>0
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</code></pre></p>
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<p><pre><code></code></pre></p>
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<h2>この機能が必要になった背景・経緯</h2>
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<p>C++14まではラムダ式をconstexprの文脈で使うことが出来なかった。</p>
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<p>つまり、以下のようなコードが動かなかった。</p>

‎reference/memory/no-throw-forward-iterator.html‎

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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;memory&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;id-type&#34;: [&#34;concept&#34;], &#34;cpp&#34;: [&#34;cpp20&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;6e3483db1078518be108cc1a6fda0df857ae4375&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;concepts&gt;\n#include &lt;iterator&gt;\n#include &lt;memory&gt;\n#include &lt;vector&gt;\n#include &lt;forward_list&gt;\n#include &lt;list&gt;\n\ntemplate &lt;class I&gt;\nconcept no_throw_input_iterator =\n std::input_iterator&lt;I&gt; &amp;&amp;\n std::is_lvalue_reference_v&lt;std::iter_reference_t&lt;I&gt;&gt; &amp;&amp;\n std::same_as&lt;std::remove_cvref_t&lt;std::iter_reference_t&lt;I&gt;&gt;, std::iter_value_t&lt;I&gt;&gt;;\n\ntemplate&lt;class S, class I&gt;\nconcept no_throw_sentinel = std::sentinel_for&lt;S, I&gt;;\n\ntemplate&lt;class I&gt;\nconcept no_throw_forward_iterator =\n no_throw_input_iterator &lt;I&gt; &amp;&amp;\n std::forward_iterator&lt;I&gt; &amp;&amp;\n no_throw_sentinel&lt;I, I&gt;;\n\ntemplate &lt;no_throw_forward_iterator I&gt;\nvoid f(const char* name) {\n std::cout &lt;&lt; name &lt;&lt; \&#34; is no-throw-forward-iterator\&#34; &lt;&lt; std::endl;\n}\n\ntemplate&lt;typename I&gt;\nvoid f(const char* name) {\n std::cout &lt;&lt; name &lt;&lt; \&#34; is not no-throw-forward-iterator\&#34; &lt;&lt; std::endl;\n}\n\nint main() {\n f&lt;int*&gt;(\&#34;int*\&#34;);\n f&lt;const int*&gt;(\&#34;const int*\&#34;);\n f&lt;std::forward_list&lt;int&gt;::iterator&gt;(\&#34;std::forward_list&lt;int&gt;::iterator\&#34;);\n f&lt;std::list&lt;int&gt;::iterator&gt;(\&#34;std::list&lt;int&gt;::iterator\&#34;);\n f&lt;std::vector&lt;int&gt;::iterator&gt;(\&#34;std::vector&lt;int&gt;::iterator\&#34;);\n f&lt;std::vector&lt;bool&gt;::iterator&gt;(\&#34;std::vector&lt;bool&gt;::iterator\&#34;);\n\n std::cout &lt;&lt; \&#34;\\n\&#34;;\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;memory&#34;, &#34;no-throw-forward-iterator&#34;]}">
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;memory&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;id-type&#34;: [&#34;concept&#34;], &#34;cpp&#34;: [&#34;cpp20&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;01a88f7dabe361fe1d22834eea4da59f1b5ba5e7&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;concepts&gt;\n#include &lt;iterator&gt;\n#include &lt;memory&gt;\n#include &lt;vector&gt;\n#include &lt;forward_list&gt;\n#include &lt;list&gt;\n\ntemplate &lt;class I&gt;\nconcept no_throw_input_iterator =\n std::input_iterator&lt;I&gt; &amp;&amp;\n std::is_lvalue_reference_v&lt;std::iter_reference_t&lt;I&gt;&gt; &amp;&amp;\n std::same_as&lt;std::remove_cvref_t&lt;std::iter_reference_t&lt;I&gt;&gt;, std::iter_value_t&lt;I&gt;&gt;;\n\ntemplate&lt;class S, class I&gt;\nconcept no_throw_sentinel = std::sentinel_for&lt;S, I&gt;;\n\ntemplate&lt;class I&gt;\nconcept no_throw_forward_iterator =\n no_throw_input_iterator &lt;I&gt; &amp;&amp;\n std::forward_iterator&lt;I&gt; &amp;&amp;\n no_throw_sentinel&lt;I, I&gt;;\n\ntemplate &lt;no_throw_forward_iterator I&gt;\nvoid f(const char* name) {\n std::cout &lt;&lt; name &lt;&lt; \&#34; is no-throw-forward-iterator\&#34; &lt;&lt; std::endl;\n}\n\ntemplate&lt;typename I&gt;\nvoid f(const char* name) {\n std::cout &lt;&lt; name &lt;&lt; \&#34; is not no-throw-forward-iterator\&#34; &lt;&lt; std::endl;\n}\n\nint main() {\n f&lt;int*&gt;(\&#34;int*\&#34;);\n f&lt;const int*&gt;(\&#34;const int*\&#34;);\n f&lt;std::forward_list&lt;int&gt;::iterator&gt;(\&#34;std::forward_list&lt;int&gt;::iterator\&#34;);\n f&lt;std::list&lt;int&gt;::iterator&gt;(\&#34;std::list&lt;int&gt;::iterator\&#34;);\n f&lt;std::vector&lt;int&gt;::iterator&gt;(\&#34;std::vector&lt;int&gt;::iterator\&#34;);\n f&lt;std::vector&lt;bool&gt;::iterator&gt;(\&#34;std::vector&lt;bool&gt;::iterator\&#34;);\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;memory&#34;, &#34;no-throw-forward-iterator&#34;]}">
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最終更新日時(UTC):
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<span itemprop="name">Akira Takahashi</span>
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@@ -238,7 +238,7 @@ <h2>備考</h2>
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<li>このコンセプトは、<code><a href="../vector/vector.html">std::vector</a>&lt;bool&gt;</code>のイテレータのような、プロキシオブジェクトを指すイテレータを除外する</li>
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</ul>
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<h2>例</h2>
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<p><div class="yata" id="6e3483db1078518be108cc1a6fda0df857ae4375"><div class="codehilite"><pre><span></span><code><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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<p><div class="yata" id="01a88f7dabe361fe1d22834eea4da59f1b5ba5e7"><div class="codehilite"><pre><span></span><code><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="../concepts.html">&lt;concepts&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="cp">#include</span> <span class="cpf"><a href="../memory.html">&lt;memory&gt;</a></span><span class="cp"></span>
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<span class="n">f</span><span class="o">&lt;</span><span class="n"><a href="../list/list.html">std::list</a></span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;::</span><span class="n">iterator</span><span class="o">&gt;</span><span class="p">(</span><span class="s">"<a href="../list/list.html">std::list</a>&lt;int&gt;::iterator"</span><span class="p">);</span>
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<span class="n">f</span><span class="o">&lt;</span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;::</span><span class="n">iterator</span><span class="o">&gt;</span><span class="p">(</span><span class="s">"<a href="../vector/vector.html">std::vector</a>&lt;int&gt;::iterator"</span><span class="p">);</span>
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<span class="n">f</span><span class="o">&lt;</span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o">&lt;</span><span class="kt">bool</span><span class="o">&gt;::</span><span class="n">iterator</span><span class="o">&gt;</span><span class="p">(</span><span class="s">"<a href="../vector/vector.html">std::vector</a>&lt;bool&gt;::iterator"</span><span class="p">);</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
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‎reference/memory/no-throw-input-iterator.html‎

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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;memory&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;id-type&#34;: [&#34;concept&#34;], &#34;cpp&#34;: [&#34;cpp20&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;927ae4ed5c40880dc67964b4f9c7bfb4333277b8&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;concepts&gt;\n#include &lt;iterator&gt;\n#include &lt;memory&gt;\n#include &lt;vector&gt;\n#include &lt;forward_list&gt;\n#include &lt;list&gt;\n\ntemplate &lt;class I&gt;\nconcept no_throw_input_iterator =\n std::input_iterator&lt;I&gt; &amp;&amp;\n std::is_lvalue_reference_v&lt;std::iter_reference_t&lt;I&gt;&gt; &amp;&amp;\n std::same_as&lt;std::remove_cvref_t&lt;std::iter_reference_t&lt;I&gt;&gt;, std::iter_value_t&lt;I&gt;&gt;;\n\ntemplate &lt;no_throw_input_iterator I&gt;\nvoid f(const char* name) {\n std::cout &lt;&lt; name &lt;&lt; \&#34; is no-throw-input-iterator\&#34; &lt;&lt; std::endl;\n}\n\ntemplate&lt;typename I&gt;\nvoid f(const char* name) {\n std::cout &lt;&lt; name &lt;&lt; \&#34; is not no-throw-input-iterator\&#34; &lt;&lt; std::endl;\n}\n\nint main() {\n f&lt;int*&gt;(\&#34;int*\&#34;);\n f&lt;const int*&gt;(\&#34;const int*\&#34;);\n f&lt;std::forward_list&lt;int&gt;::iterator&gt;(\&#34;std::forward_list&lt;int&gt;::iterator\&#34;);\n f&lt;std::list&lt;int&gt;::iterator&gt;(\&#34;std::list&lt;int&gt;::iterator\&#34;);\n f&lt;std::vector&lt;int&gt;::iterator&gt;(\&#34;std::vector&lt;int&gt;::iterator\&#34;);\n f&lt;std::vector&lt;bool&gt;::iterator&gt;(\&#34;std::vector&lt;bool&gt;::iterator\&#34;);\n\n std::cout &lt;&lt; \&#34;\\n\&#34;;\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;memory&#34;, &#34;no-throw-input-iterator&#34;]}">
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<header data-kunai-mdinfo="{&#34;meta&#34;: {&#34;header&#34;: [&#34;memory&#34;], &#34;namespace&#34;: [&#34;std&#34;], &#34;id-type&#34;: [&#34;concept&#34;], &#34;cpp&#34;: [&#34;cpp20&#34;]}, &#34;sources&#34;: [{&#34;id&#34;: &#34;5790e81659f370aea6fc8dbcd49ff6577b0057c5&#34;, &#34;source&#34;: &#34;#include &lt;iostream&gt;\n#include &lt;concepts&gt;\n#include &lt;iterator&gt;\n#include &lt;memory&gt;\n#include &lt;vector&gt;\n#include &lt;forward_list&gt;\n#include &lt;list&gt;\n\ntemplate &lt;class I&gt;\nconcept no_throw_input_iterator =\n std::input_iterator&lt;I&gt; &amp;&amp;\n std::is_lvalue_reference_v&lt;std::iter_reference_t&lt;I&gt;&gt; &amp;&amp;\n std::same_as&lt;std::remove_cvref_t&lt;std::iter_reference_t&lt;I&gt;&gt;, std::iter_value_t&lt;I&gt;&gt;;\n\ntemplate &lt;no_throw_input_iterator I&gt;\nvoid f(const char* name) {\n std::cout &lt;&lt; name &lt;&lt; \&#34; is no-throw-input-iterator\&#34; &lt;&lt; std::endl;\n}\n\ntemplate&lt;typename I&gt;\nvoid f(const char* name) {\n std::cout &lt;&lt; name &lt;&lt; \&#34; is not no-throw-input-iterator\&#34; &lt;&lt; std::endl;\n}\n\nint main() {\n f&lt;int*&gt;(\&#34;int*\&#34;);\n f&lt;const int*&gt;(\&#34;const int*\&#34;);\n f&lt;std::forward_list&lt;int&gt;::iterator&gt;(\&#34;std::forward_list&lt;int&gt;::iterator\&#34;);\n f&lt;std::list&lt;int&gt;::iterator&gt;(\&#34;std::list&lt;int&gt;::iterator\&#34;);\n f&lt;std::vector&lt;int&gt;::iterator&gt;(\&#34;std::vector&lt;int&gt;::iterator\&#34;);\n f&lt;std::vector&lt;bool&gt;::iterator&gt;(\&#34;std::vector&lt;bool&gt;::iterator\&#34;);\n}\n&#34;}], &#34;page_id&#34;: [&#34;reference&#34;, &#34;memory&#34;, &#34;no-throw-input-iterator&#34;]}">
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<h2>例</h2>
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<p><div class="yata" id="5790e81659f370aea6fc8dbcd49ff6577b0057c5"><div class="codehilite"><pre><span></span><code><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="n">f</span><span class="o">&lt;</span><span class="n"><a href="../list/list.html">std::list</a></span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;::</span><span class="n">iterator</span><span class="o">&gt;</span><span class="p">(</span><span class="s">"<a href="../list/list.html">std::list</a>&lt;int&gt;::iterator"</span><span class="p">);</span>
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<span class="n">f</span><span class="o">&lt;</span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o">&lt;</span><span class="kt">bool</span><span class="o">&gt;::</span><span class="n">iterator</span><span class="o">&gt;</span><span class="p">(</span><span class="s">"<a href="../vector/vector.html">std::vector</a>&lt;bool&gt;::iterator"</span><span class="p">);</span>
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‎reference/ranges/cartesian_product_view.html‎

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‎reference/ranges/elements_view.html‎

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<p><pre><code>1
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‎reference/ranges/filter_view/pred.html‎

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