mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-09-20 22:51:58 +00:00
21 lines
405 B
Rust
21 lines
405 B
Rust
#![warn(clippy::copy_iterator)]
|
|
|
|
#[derive(Copy, Clone)]
|
|
struct Countdown(u8);
|
|
|
|
impl Iterator for Countdown {
|
|
type Item = u8;
|
|
|
|
fn next(&mut self) -> Option<u8> {
|
|
self.0.checked_sub(1).map(|c| {
|
|
self.0 = c;
|
|
c
|
|
})
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let my_iterator = Countdown(5);
|
|
assert_eq!(my_iterator.take(1).count(), 1);
|
|
assert_eq!(my_iterator.count(), 5);
|
|
}
|