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

NAME
       std::indirect_result_t -	std::indirect_result_t

Synopsis
	  Defined in header <iterator>
	  template< class F, class... Is >

	  requires (std::indirectly_readable<Is> && ...) &&
	  std::invocable<F,			 std::iter_reference_t<Is>...>
       (since C++20)

	  using	indirect_result_t = std::invoke_result_t<F,
	  std::iter_reference_t<Is>...>;

	  The alias template indirect_result_t obtains the result type of  in-
       voking an
	  invocable  type F on the result of dereferencing indirectly_readable
       types Is....

Template parameters
	  F  - an invocable type
	  Is - indirectly readable types that are dereferenced to arguments

See also
	  result_of		    deduces the	 result	 type  of  invoking  a
       callable	object with
	  invoke_result		    a set of arguments
	  (C++11)(removed in C++20) (class template)
	  (C++17)

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

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