How do I handle errors in Rust's Rayon library?

How do I handle errors in Rust's Rayon library?

In Rust's Rayon library, you can handle errors by using the Result type. Each thread can return a Result, and you can collect these results to check for errors.

Can you show me a code example?

Sure! Here's a simple example:

use rayon::prelude::*;

fn main() {
    let results: Vec<Result<i32, &str>> = (0..10)
        .into_par_iter()
        .map(|x| if x % 2 == 0 { Ok(x) } else { Err("Odd number") })
        .collect();

    for result in results {
        match result {
            Ok(value) => println!("Value: {}", value),
            Err(e) => println!("Error: {}", e),
        }
    }
}

This code processes numbers in parallel and handles errors accordingly.

What happens if one of the threads fails?

If one of the threads returns an error, you can handle it in the main thread by checking the collected results. The example I provided shows how to print errors for each thread.

Is there a way to stop processing if an error occurs?

Yes, you can use the find method to stop processing as soon as an error is encountered. This way, you can exit early if needed.