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

NAME
       std::predicate -	std::predicate

Synopsis
	  Defined in header <concepts>
	  template< class F, class... Args >

	  concept   predicate	=					(since
       C++20)
	      std::regular_invocable<F,	Args...> &&

	      boolean-testable<std::invoke_result_t<F, Args...>>;

	  The concept std::predicate<F,	Args...> specifies that	F is a	predi-
       cate that accepts
	  arguments  whose  types and value categories are encoded by Args...,
       i.e., it	can be
	  invoked with these arguments to produce a boolean-testable result.

	  Note that regular_invocable requires the invocation  to  not	modify
       either the
	  callable object or the arguments and be equality-preserving.

	  Equality preservation

	  Expressions declared in requires expressions of the standard library
       concepts	are
	  required to be equality-preserving (except where stated otherwise).

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

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