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

NAME
       std::future::future - std::future::future

Synopsis
	  future() noexcept;			  (1) (since C++11)
	  future( future&& other ) noexcept;	  (2) (since C++11)
	  future( const	future&	other )	= delete; (3) (since C++11)

	  Constructs a std::future object.

	  1)  Default  constructor.  Constructs	 a  std::future	with no	shared
       state. After
	  construction,	valid()	== false.
	  2) Move constructor. Constructs a std::future	with the shared	 state
       of other	using
	  move semantics. After	construction, other.valid() == false.
	  3) std::future is not	CopyConstructible.

Parameters
	  other	- another std::future to acquire shared	state from

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

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