How to get the byte offset between `&str`

Question

I have two &str pointing to the same string, and I need to know the byte offset between them:

fn main() {
    let foo = \"  bar\";
         


        

Answer 1

This is of course kind of unsafe, but if you want arithmetic, you can just cast the pointers to usize with as and subtract that.

(Note: it's not so unsafe that the compiler will actually complain.)