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std::future...future_error(3) C++ Standard Libarystd::future...future_error(3)

NAME
       std::future_error::future_error - std::future_error::future_error

Synopsis
	  future_error(	 const	future_error&  other  )	 noexcept;  (1)	(since
       C++11)
	  explicit  future_error(  std::future_errc  ec	 );	   (2)	(since
       C++17)

	  1)  Copy constructor.	Initializes the	contents of the	new future_er-
       ror object with
	  those	of other. If *this and other both have dynamic	type  std::fu-
       ture_error then
	  std::strcmp(what(), other.what()) == 0.
	  2) Constructs	a new future_error object containing the error code
	  std::make_error_code(ec).

Parameters
	  other	- another future_error object to copy
	  ec	- error	code

Notes
	  There	 is  no	standard-compliant way for the user to construct a fu-
       ture_error other
	  than copying from another future_error prior	to  C++17.  C++11  and
       C++14 depict an
	  exposition-only  public  constructor	taking	a std::error_code, and
       some
	  implementations provide such a constructor.

http://cppreference.com		  2022.07.31	 std::future...future_error(3)

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