std::experimental::future<T>::operator=

std::experimental::future<T>& operator=( std::experimental::future<T>&& other ) noexcept;	(1)
std::experimental::future<T>& operator=( const std::experimental::future<T>& other ) = delete;	(2)

赋值另一 future 对象的内容。

1) 释放任何共享状态并移动赋值 other 给 *this 。赋值后 other.valid() == false 而 this->valid() 将生成与 other.valid() 在赋值前相同的值。

2) std::experimental::future 不可复制赋值 (CopyAssignable) 。

other - 将传递状态给 *this 的 std::experimental::future

*this

std::future 扩展
experimental::future
experimental::shared_future
experimental::when_all
experimental::when_any
experimental::make_ready_future
experimental::make_exceptional_future
闩和屏障
experimental::latch
experimental::barrier
experimental::flex_barrier
原子智能指针
experimental::atomic_shared_ptr
experimental::atomic_weak_ptr