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<header data-kunai-mdinfo="{"meta": {"header": ["concepts"], "namespace": ["std"], "id-type": ["concept"], "cpp": ["cpp20"]}, "sources": [{"id": "5d495e716125ae3f6a9fcd46e5ce4e4ac139e930", "source": "#include <iostream>\n#include <concepts>\n\ntemplate<typename R, typename T, typename U>\nrequires std::relation<R, T, U>\nvoid f(const char* name, const char* tname, const char* uname) {\n std::cout << name << \" is relation between \" << tname << \" and \" << uname << std::endl;\n}\n\ntemplate<typename R, typename T, typename U>\nvoid f(const char* name, const char* tname, const char* uname) {\n std::cout << name << \" is not relation between \" << tname << \" and \" << uname << std::endl;\n}\n\n\nstruct S1 {\n int n = 0;\n};\n\nstruct S2 {\n short m = 0;\n};\n\n// S1\u3068S2\u306e\u9593\u306e\u540c\u5024\u95a2\u4fc2\nstruct relation_s1s2 {\n\n bool operator()(S1 lhs, S1 rhs) const {\n return lhs.n == rhs.n;\n }\n\n bool operator()(S2 lhs, S2 rhs ) const {\n return lhs.m == rhs.m;\n }\n\n bool operator()(S1 lhs, S2 rhs) const {\n return lhs.n == rhs.m;\n }\n\n bool operator()(S2 lhs, S1 rhs) const {\n return lhs.m == rhs.n;\n }\n};\n\n// \u5358\u306bS1\u3068S2\u306e\u9593\u306e\u8ff0\u8a9e\u3067\u3042\u308b\u3060\u3051\u3067\u306frelation\u3067\u306f\u306a\u3044\nstruct not_relation_s1s2 {\n\n bool operator()(S1 lhs, S2 rhs) const {\n return lhs.n == rhs.m;\n }\n\n bool operator()(S2 lhs, S1 rhs) const {\n return lhs.m == rhs.n;\n }\n};\n\nint main() {\n f<relation_s1s2, S1, S2>(\"relation_s1s2\", \"S1\", \"S2\");\n f<not_relation_s1s2, S1, S2>(\"not_relation_s1s2\", \"S1\", \"S2\");\n}\n"}], "page_id": ["reference", "concepts", "relation"]}">
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<div class="identifier-type">concept</div><div class="header"><concepts></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">relation</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">R</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">U</span><span class="o">></span>
<span class="w"> </span><span class="k">concept</span><span class="w"> </span><span class="nc">relation</span><span class="w"> </span><span class="o">=</span>
<span class="w"> </span><span class="n"><a href="predicate.html">predicate</a></span><span class="o"><</span><span class="n">R</span><span class="p">,</span><span class="w"> </span><span class="n">T</span><span class="p">,</span><span class="w"> </span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="o">&&</span><span class="w"> </span><span class="n"><a href="predicate.html">predicate</a></span><span class="o"><</span><span class="n">R</span><span class="p">,</span><span class="w"> </span><span class="n">U</span><span class="p">,</span><span class="w"> </span><span class="n">U</span><span class="o">></span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span><span class="n"><a href="predicate.html">predicate</a></span><span class="o"><</span><span class="n">R</span><span class="p">,</span><span class="w"> </span><span class="n">T</span><span class="p">,</span><span class="w"> </span><span class="n">U</span><span class="o">></span><span class="w"> </span><span class="o">&&</span><span class="w"> </span><span class="n"><a href="predicate.html">predicate</a></span><span class="o"><</span><span class="n">R</span><span class="p">,</span><span class="w"> </span><span class="n">U</span><span class="p">,</span><span class="w"> </span><span class="n">T</span><span class="o">></span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>relation</code>は、任意の<a href="predicate.html">述語</a><code>R</code>が型<code>T, U</code>の間の二項関係にあることを表すコンセプトである。</p>
<h2>例</h2>
<p><div class="yata" id="5d495e716125ae3f6a9fcd46e5ce4e4ac139e930"><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="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">T</span><span class="p">,</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">U</span><span class="o">></span>
<span class="k">requires</span><span class="w"> </span><span class="n"><span style="color:#ff0000">std::relation</span></span><span class="o"><</span><span class="n">R</span><span class="p">,</span><span class="w"> </span><span class="n">T</span><span class="p">,</span><span class="w"> </span><span class="n">U</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="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">tname</span><span class="p">,</span><span class="w"> </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">uname</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 relation between "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">tname</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">" and "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">uname</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">R</span><span class="p">,</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">T</span><span class="p">,</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">U</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="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">tname</span><span class="p">,</span><span class="w"> </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">uname</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 relation between "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">tname</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">" and "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">uname</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">struct</span><span class="w"> </span><span class="nc">S1</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="p">};</span>
<span class="k">struct</span><span class="w"> </span><span class="nc">S2</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kt">short</span><span class="w"> </span><span class="n">m</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="p">};</span>
<span class="c1">// S1とS2の間の同値関係</span>
<span class="k">struct</span><span class="w"> </span><span class="nc">relation_s1s2</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="nf">operator</span><span class="p">()(</span><span class="n">S1</span><span class="w"> </span><span class="n">lhs</span><span class="p">,</span><span class="w"> </span><span class="n">S1</span><span class="w"> </span><span class="n">rhs</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">lhs</span><span class="p">.</span><span class="n">n</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">rhs</span><span class="p">.</span><span class="n">n</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="nf">operator</span><span class="p">()(</span><span class="n">S2</span><span class="w"> </span><span class="n">lhs</span><span class="p">,</span><span class="w"> </span><span class="n">S2</span><span class="w"> </span><span class="n">rhs</span><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">lhs</span><span class="p">.</span><span class="n">m</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">rhs</span><span class="p">.</span><span class="n">m</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="nf">operator</span><span class="p">()(</span><span class="n">S1</span><span class="w"> </span><span class="n">lhs</span><span class="p">,</span><span class="w"> </span><span class="n">S2</span><span class="w"> </span><span class="n">rhs</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">lhs</span><span class="p">.</span><span class="n">n</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">rhs</span><span class="p">.</span><span class="n">m</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="nf">operator</span><span class="p">()(</span><span class="n">S2</span><span class="w"> </span><span class="n">lhs</span><span class="p">,</span><span class="w"> </span><span class="n">S1</span><span class="w"> </span><span class="n">rhs</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">lhs</span><span class="p">.</span><span class="n">m</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">rhs</span><span class="p">.</span><span class="n">n</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">};</span>
<span class="c1">// 単にS1とS2の間の述語であるだけではrelationではない</span>
<span class="k">struct</span><span class="w"> </span><span class="nc">not_relation_s1s2</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="nf">operator</span><span class="p">()(</span><span class="n">S1</span><span class="w"> </span><span class="n">lhs</span><span class="p">,</span><span class="w"> </span><span class="n">S2</span><span class="w"> </span><span class="n">rhs</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">lhs</span><span class="p">.</span><span class="n">n</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">rhs</span><span class="p">.</span><span class="n">m</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="nf">operator</span><span class="p">()(</span><span class="n">S2</span><span class="w"> </span><span class="n">lhs</span><span class="p">,</span><span class="w"> </span><span class="n">S1</span><span class="w"> </span><span class="n">rhs</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">lhs</span><span class="p">.</span><span class="n">m</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">rhs</span><span class="p">.</span><span class="n">n</span><span class="p">;</span>
<span class="w"> </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="n">f</span><span class="o"><</span><span class="n">relation_s1s2</span><span class="p">,</span><span class="w"> </span><span class="n">S1</span><span class="p">,</span><span class="w"> </span><span class="n">S2</span><span class="o">></span><span class="p">(</span><span class="s">"relation_s1s2"</span><span class="p">,</span><span class="w"> </span><span class="s">"S1"</span><span class="p">,</span><span class="w"> </span><span class="s">"S2"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="n">not_relation_s1s2</span><span class="p">,</span><span class="w"> </span><span class="n">S1</span><span class="p">,</span><span class="w"> </span><span class="n">S2</span><span class="o">></span><span class="p">(</span><span class="s">"not_relation_s1s2"</span><span class="p">,</span><span class="w"> </span><span class="s">"S1"</span><span class="p">,</span><span class="w"> </span><span class="s">"S2"</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>relation_s1s2 is relation between S1 and S2
not_relation_s1s2 is not relation between S1 and S2
</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>: ??</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 3 <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/p0898r3.pdf" target="_blank">P0898R3 Standard Library Concepts</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1754r1.pdf" target="_blank">P1754R1 Rename concepts to standard_case for C++20, while we still can</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1248r1.html" target="_blank">P1248R1 Remove <code>CommonReference</code> requirement from <code>StrictWeakOrdering</code> (a.k.a Fixing Relations)</a></li>
<li><a href="https://ja.wikipedia.org/wiki/二項関係" target="_blank">二項関係 - wikipedia</a></li>
</ul></div>
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