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std::relation(3)	      C++ Standard Libary	      std::relation(3)

NAME
       std::relation - std::relation

Synopsis
	  Defined in header <concepts>
	  template< class R, class T, class U >

	  concept relation =					    (1)	(since
       C++20)
	      std::predicate<R,	T, T> && std::predicate<R, U, U> &&

	      std::predicate<R,	T, U> && std::predicate<R, U, T>;

	  The  concept relation<R, T, U> specifies that	R defines a binary re-
       lation over the
	  set of expressions whose type	and value category are	those  encoded
       by either T or U.

http://cppreference.com		  2024.06.10		      std::relation(3)

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