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std::packag...:get_future(3)  C++ Standard Libary std::packag...:get_future(3)

NAME
       std::packaged_task::get_future -	std::packaged_task::get_future

Synopsis
	  std::future<R> get_future();	(since C++11)

	  Returns a future which shares	the same shared	state as *this.

	  get_future can be called only	once for each packaged_task.

Parameters
	  (none)

Return value
	  A future which shares	the same shared	state as *this.

Exceptions
	  std::future_error on the following error conditions:

	    *  The  shared  state  has	already	 been  retrieved via a call to
       get_future. The error
	      category is set to future_already_retrieved.
	    * *this has	 no  shared  state.  The  error	 category  is  set  to
       no_state.

http://cppreference.com		  2022.07.31	  std::packag...:get_future(3)

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