mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-12-18 00:53:31 +00:00
32 lines
898 B
Rust
32 lines
898 B
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
#![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);
|
|
}
|