1
0
Fork 0
mirror of https://github.com/notohh/rustlings.git synced 2024-12-20 23:48:09 -05:00
rustlings/solutions/13_error_handling/errors4.rs
2024-08-22 14:42:17 +02:00

42 lines
939 B
Rust

use std::cmp::Ordering;
#[derive(PartialEq, Debug)]
enum CreationError {
Negative,
Zero,
}
#[derive(PartialEq, Debug)]
struct PositiveNonzeroInteger(u64);
impl PositiveNonzeroInteger {
fn new(value: i64) -> Result<Self, CreationError> {
match value.cmp(&0) {
Ordering::Less => Err(CreationError::Negative),
Ordering::Equal => Err(CreationError::Zero),
Ordering::Greater => Ok(Self(value as u64)),
}
}
}
fn main() {
// You can optionally experiment here.
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_creation() {
assert_eq!(
PositiveNonzeroInteger::new(10),
Ok(PositiveNonzeroInteger(10)),
);
assert_eq!(
PositiveNonzeroInteger::new(-10),
Err(CreationError::Negative),
);
assert_eq!(PositiveNonzeroInteger::new(0), Err(CreationError::Zero));
}
}