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std::shared_future::valid

STD：：共享[医]未来：：有效

bool valid() const;​(since C++11)

检查未来是否指共享状态。

这种情况只适用于那些没有违约或被转移的期货。不像std::future，，，std::shared_future%27s共享状态不会在下列情况下失效get()叫做。

如果除析构函数、复制赋值运算符、移动赋值运算符以外的任何成员函数，或valid调用shared_future这不引用共享状态%28，尽管鼓励实现抛出std::future_error指示no_state在本例中%29。从共享文件中移动或复制是有效的。[医]未来对象valid()是false...

参数

%280%29

返回值

true如果%2A这指的是共享状态，否则为false...

例外

noexcept规格：

noexcept

例

另见

waitwaits for the result to become available (public member function)

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