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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		  2022.07.31		      std::relation(3)

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