如何在没有显式强制转换的情况下使用整数类型（除usize之外）索引向量？ [英] How to index vectors with integer types (besides usize), without explicit cast?

问题描述

有时索引需要紧密包装（例如，网格几何），将索引存储为 u32 而不是 usize很有用。

有没有一种方法可以在Rust中索引向量，而不必显式转换为 usize 每次？例如：

  vector [some_u32 asize]; 
  

在单个实例中进行铸造不是问题，只是在经常需要时乏味。

有没有一种方法可以避免不必在此处投射？

解决方案

否。

如果它是您自己的类型，则可以实现 Index< u32> ，但事实并非如此，您可以

如果您真的在病理学上反对强制转换索引，则可以编写一个执行强制转换的适配器类型，但这有点愚蠢。 / p>

There are times when indices need to be tightly packed (mesh geometry for example), where its useful to store indices as u32 instead of usize.

Is there a way to index a vector in Rust without having to explicitly cast to usize every time? eg:

vector[some_u32 as usize];

Casting in single instances isn't a problem, its just tedious when needed frequently.

Is there a way to avoid having to cast here?

解决方案

No.

If it were your own type, you could implement Index<u32>, but it isn't and you can't.

If you're really, pathologically opposed to casting the index, you could write an adaptor type that does the cast, but that's getting a bit silly.

这篇关于如何在没有显式强制转换的情况下使用整数类型（除usize之外）索引向量？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！