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std::future<T>:: future

From cppreference.net
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std::future
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