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Update 6.4 Future-tutorial.md #8

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2 changes: 1 addition & 1 deletion zh/chapter6-Future/6.4 Future-tutorial.md
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Expand Up @@ -160,7 +160,7 @@

检查当前的 `std::future` 对象是否有效，即释放与某个共享状态相关联。

一个有效的 `std::future` 对象只能通过 `std::async()`, `std::future::get_future` 或者 `std::packaged_task::get_future` 来初始化。
一个有效的 `std::future` 对象只能通过 `std::async()`, `std::promise::get_future` 或者 `std::packaged_task::get_future` 来初始化。

另外由 `std::future` 默认构造函数创建的 `std::future` 对象是无效(`invalid`)的，当然通过 `std::future` 的 `move` 赋值后该 `std::future` 对象也可以变为 `valid`。

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