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std::shared_future<T>:: shared_future

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std::shared_future
shared_future ( ) noexcept ;
(1) (自 C++11 起)
(2)
shared_future ( const shared_future & other ) ;
(自 C++11 起)
(直至 C++17)
shared_future ( const shared_future & other ) noexcept ;
(自 C++17 起)
shared_future ( std:: future < T > && other ) noexcept ;
(3) (自 C++11 起)
shared_future ( shared_future && other ) noexcept ;
(4) (自 C++11 起)

构造一个新的 shared_future 。

1) 默认构造函数。构造一个空的 shared future，它不引用任何共享状态，即 valid ( ) == false 。
2) 构造一个共享 future，该 future 引用与 other 相同的共享状态（如果存在）。
3,4) 将 other 持有的共享状态转移给 * this 。构造完成后， other. valid ( ) == false ，且 this - > valid ( ) 的返回值与构造前 other. valid ( ) 的返回值相同。

参数

其他 - 用于初始化的另一个 future 对象