使用 as 进行类型转换

Rust 并没有为基本类型提供隐式的类型转换( coercion )，但是我们可以通过 as 来进行显式地转换。

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  1. 🌟🌟 默认情况下, 数值溢出会导致编译错误，但是我们可以通过添加一行全局注解的方式来避免编译错误(溢出还是会发生)
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  1. 🌟🌟 当将任何数值转换成无符号整型 T 时，如果当前的数值不在新类型的范围内，我们可以对当前数值进行加值或减值操作( 增加或减少 T::MAX + 1 )，直到最新的值在新类型的范围内，假设我们要将 300 转成 u8 类型，由于u8 最大值是 255，因此 300 不在新类型的范围内并且大于新类型的最大值，因此我们需要减去 T::MAX + 1，也就是 300 - 256 = 44。
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  1. 🌟🌟🌟 裸指针可以和代表内存地址的整数互相转换
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你可以在这里找到答案(在 solutions 路径下)