mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-09-21 07:01:54 +00:00
23 lines
467 B
Rust
23 lines
467 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);
|
|
let a: Vec<_> = my_iterator.take(1).collect();
|
|
assert_eq!(a.len(), 1);
|
|
let b: Vec<_> = my_iterator.collect();
|
|
assert_eq!(b.len(), 5);
|
|
}
|