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std::future<T>:: operator=

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std::future
future & operator = ( future && other ) noexcept ;
(1) (自 C++11 起)
future & operator = ( const future & other ) = delete ;
(2) (自 C++11 起)

将另一个 future 对象的内容进行赋值。

1) 释放所有共享状态，并将 other 的内容移动赋值给 * this 。赋值操作后， other. valid ( ) == false ，且 this - > valid ( ) 将返回与赋值前 other. valid ( ) 相同的值。
2) std::future 不满足 CopyAssignable 要求。

参数

其他 - 一个将状态转移给 * this 的 std::future

返回值

* this