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std::shared_future<T>::operator= - cppreference.com

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(1)

shared_future& operator=( const shared_future& other );

 (since C++11)
(until C++17)

shared_future& operator=( const shared_future& other ) noexcept;

 (since C++17)

shared_future& operator=( shared_future&& other ) noexcept;

 (2) (since C++11)

Assigns the contents of another shared_future.

1) Releases any shared state and assigns the contents of other to *this. After the assignment, this->valid() == other.valid().

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

Parameters

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

Return value

*this