Catch panic on vec drain

user_8964160 0
Viewed 114

What is the best way to catch this panic?

fn main() {
    let mut v = vec![1, 2, 3, 4, 5];
    let u: Vec<_> = v.drain(.. 8).collect();
}

I know that I could do something like this

fn main() {
    let mut v = vec![1, 2, 3, 4, 5];
    if v.len() < 8 {
        // error here...
    }
    let u: Vec<_> = v.drain(.. 8).collect();
}

Is there a better way to do this? I'd like to catch "all" errors, not just if the index is greater than the length. I couldn't find anything in the documentation beyond.

Panics if the starting point is greater than the end point or if the end point is greater than the length of the vector.

rust
1 Answers

You could use slice::get():

fn main() {
    let mut v = vec![1, 2, 3, 4, 5];
    let range = 8..2;
    if v.get(range.clone()).is_some() {
      let u: Vec<_> = v.drain(range).collect();
    }
    else {
        // bad
    }
}
user_70761530
Related