mirror of
https://github.com/rust-lang/rustlings.git
synced 2024-12-27 15:56:28 +00:00
37 lines
795 B
Rust
37 lines
795 B
Rust
#[derive(PartialEq, Debug)]
|
|
enum CreationError {
|
|
Negative,
|
|
Zero,
|
|
}
|
|
|
|
#[derive(PartialEq, Debug)]
|
|
struct PositiveNonzeroInteger(u64);
|
|
|
|
impl PositiveNonzeroInteger {
|
|
fn new(value: i64) -> Result<Self, CreationError> {
|
|
// TODO: This function shouldn't always return an `Ok`.
|
|
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));
|
|
}
|
|
}
|