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book: typo fix #202

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Aug 6, 2021
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book: typo fix #202

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2 changes: 1 addition & 1 deletion book/zh-cn/03-runtime.md
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Expand Up @@ -544,7 +544,7 @@ constexpr _Tp&& forward(typename std::remove_reference<_Tp>::type&& __t) noexcep
而 `std::is_lvalue_reference` 用于检查类型推导是否正确，在 `std::forward` 的第二个实现中
检查了接收到的值确实是一个左值，进而体现了坍缩规则。

当 `std::forward` 接受左值时，`_Tp` 被推导为左值，而所以返回值为左值；而当其接受右值时，
当 `std::forward` 接受左值时，`_Tp` 被推导为左值，所以返回值为左值；而当其接受右值时，
`_Tp` 被推导为 右值引用，则基于坍缩规则，返回值便成为了 `&& + &&` 的右值。
可见 `std::forward` 的原理在于巧妙的利用了模板类型推导中产生的差异。

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