std::future<T>::operator=

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

future& operator=( const future& other ) = delete;

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() before the assignment.

2) std::future is not CopyAssignable.

Parameters

Return value

*this.