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

NAME
       std::regular - std::regular

Synopsis
	  Defined in header <concepts>
	  template			    <class			    T>
       (since C++20)
	  concept  regular  =  std::semiregular<T>  &&	std::equality_compara-
       ble<T>;

	  The regular concept specifies	that a type is regular,	that is, it is
       copyable,
	  default  constructible,  and equality	comparable. It is satisfied by
       types that behave
	  similarly to built-in	types like int,	and that are  comparable  with
       ==.

Example
       // Run this code

	#include <concepts>
	#include <iostream>

	template<std::regular T>
	struct Single {
	    T value;
	    friend bool	operator==(const Single&, const	Single&) = default;
	};

	int main()
	{
	    Single<int>	myInt1{4};
	    Single<int>	myInt2;
	    myInt2 = myInt1;

	    if (myInt1 == myInt2)
		std::cout << "Equal\n";

	    std::cout << myInt1.value << ' ' <<	myInt2.value <<	'\n';
	}

Output:
	Equal
	4 4

See also
	  semiregular specifies	that an	object of a type can be	copied,	moved,
       swapped,	and
	  (C++20)     default constructed
		      (concept)

http://cppreference.com		  2022.07.31		       std::regular(3)

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