std::future<T>::operator=

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

Assigns the contents of another future object.

1) Releases any shared state and move-assigns the contents of other to *this. After the assignment, other.valid() == false and this->valid() will yield the same value as other.valid()

Parameters

other - a std::future that will transfer state to *this

Return value

*this