What is the best way to convert from `Vec` to `Vec`?

Question

In my case I am converting from Vec<u32> to Vec<usize>.

Currently doing:

let usize_vec:Vec<usize> = u32_vec.into_iter().map(|x|x as usize).collect();

Answer 1

That's the best way for your particular example, with u32 to usize. If you want to use unsafe features to transmute the contents of the vector instead, you can use std::slice::align_to/std::slice::align_to_mut.