mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-12-18 09:03:18 +00:00
60 lines
2.2 KiB
Rust
60 lines
2.2 KiB
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.
|
|
|
|
use std::iter::repeat;
|
|
#[allow(clippy::trivially_copy_pass_by_ref)]
|
|
fn square_is_lower_64(x: &u32) -> bool {
|
|
x * x < 64
|
|
}
|
|
|
|
#[allow(clippy::maybe_infinite_iter)]
|
|
#[deny(clippy::infinite_iter)]
|
|
fn infinite_iters() {
|
|
repeat(0_u8).collect::<Vec<_>>(); // infinite iter
|
|
(0..8_u32).take_while(square_is_lower_64).cycle().count(); // infinite iter
|
|
(0..8_u64).chain(0..).max(); // infinite iter
|
|
(0_usize..)
|
|
.chain([0usize, 1, 2].iter().cloned())
|
|
.skip_while(|x| *x != 42)
|
|
.min(); // infinite iter
|
|
(0..8_u32)
|
|
.rev()
|
|
.cycle()
|
|
.map(|x| x + 1_u32)
|
|
.for_each(|x| println!("{}", x)); // infinite iter
|
|
(0..3_u32).flat_map(|x| x..).sum::<u32>(); // infinite iter
|
|
(0_usize..).flat_map(|x| 0..x).product::<usize>(); // infinite iter
|
|
(0_u64..).filter(|x| x % 2 == 0).last(); // infinite iter
|
|
(0..42_u64).by_ref().last(); // not an infinite, because ranges are double-ended
|
|
(0..).next(); // iterator is not exhausted
|
|
}
|
|
|
|
#[deny(clippy::maybe_infinite_iter)]
|
|
fn potential_infinite_iters() {
|
|
(0..).zip((0..).take_while(square_is_lower_64)).count(); // maybe infinite iter
|
|
repeat(42).take_while(|x| *x == 42).chain(0..42).max(); // maybe infinite iter
|
|
(1..)
|
|
.scan(0, |state, x| {
|
|
*state += x;
|
|
Some(*state)
|
|
})
|
|
.min(); // maybe infinite iter
|
|
(0..).find(|x| *x == 24); // maybe infinite iter
|
|
(0..).position(|x| x == 24); // maybe infinite iter
|
|
(0..).any(|x| x == 24); // maybe infinite iter
|
|
(0..).all(|x| x == 24); // maybe infinite iter
|
|
|
|
(0..).zip(0..42).take_while(|&(x, _)| x != 42).count(); // not infinite
|
|
repeat(42).take_while(|x| *x == 42).next(); // iterator is not exhausted
|
|
}
|
|
|
|
fn main() {
|
|
infinite_iters();
|
|
potential_infinite_iters();
|
|
}
|