Rust Notes

# Rust Notes #.md

Safe conversion from u32 to i32:

use std::convert::TryFrom;

fn main() {
    let good: u32 = 50;
    let ok: i32 = i32::try_from(good).unwrap();
    println!("{} -> {}", good, ok);

    let bad: u32 = u32::MAX;
    let err: i32 = i32::try_from(bad).unwrap(); // PANIC
    println!("{} -> {}", bad, err);
}