104 lines
3.0 KiB
Rust
104 lines
3.0 KiB
Rust
//@run-rustfix
|
|
|
|
#![allow(clippy::stable_sort_primitive)]
|
|
|
|
use std::cell::Ref;
|
|
|
|
fn unnecessary_sort_by() {
|
|
fn id(x: isize) -> isize {
|
|
x
|
|
}
|
|
|
|
let mut vec: Vec<isize> = vec![3, 6, 1, 2, 5];
|
|
// Forward examples
|
|
vec.sort();
|
|
vec.sort_unstable();
|
|
vec.sort_by_key(|a| (a + 5).abs());
|
|
vec.sort_unstable_by_key(|a| id(-a));
|
|
// Reverse examples
|
|
vec.sort_by(|a, b| b.cmp(a)); // not linted to avoid suggesting `Reverse(b)` which would borrow
|
|
vec.sort_by_key(|b| std::cmp::Reverse((b + 5).abs()));
|
|
vec.sort_unstable_by_key(|b| std::cmp::Reverse(id(-b)));
|
|
// Negative examples (shouldn't be changed)
|
|
let c = &7;
|
|
vec.sort_by(|a, b| (b - a).cmp(&(a - b)));
|
|
vec.sort_by(|_, b| b.cmp(&5));
|
|
vec.sort_by(|_, b| b.cmp(c));
|
|
vec.sort_unstable_by(|a, _| a.cmp(c));
|
|
|
|
// Vectors of references are fine as long as the resulting key does not borrow
|
|
let mut vec: Vec<&&&isize> = vec![&&&3, &&&6, &&&1, &&&2, &&&5];
|
|
vec.sort_by_key(|a| (***a).abs());
|
|
vec.sort_unstable_by_key(|a| (***a).abs());
|
|
// `Reverse(b)` would borrow in the following cases, don't lint
|
|
vec.sort_by(|a, b| b.cmp(a));
|
|
vec.sort_unstable_by(|a, b| b.cmp(a));
|
|
|
|
// No warning if element does not implement `Ord`
|
|
let mut vec: Vec<Ref<usize>> = Vec::new();
|
|
vec.sort_unstable_by(|a, b| a.cmp(b));
|
|
}
|
|
|
|
// Do not suggest returning a reference to the closure parameter of `Vec::sort_by_key`
|
|
mod issue_5754 {
|
|
#[derive(Clone, Copy)]
|
|
struct Test(usize);
|
|
|
|
#[derive(PartialOrd, Ord, PartialEq, Eq)]
|
|
struct Wrapper<'a>(&'a usize);
|
|
|
|
impl Test {
|
|
fn name(&self) -> &usize {
|
|
&self.0
|
|
}
|
|
|
|
fn wrapped(&self) -> Wrapper<'_> {
|
|
Wrapper(&self.0)
|
|
}
|
|
}
|
|
|
|
pub fn test() {
|
|
let mut args: Vec<Test> = vec![];
|
|
|
|
// Forward
|
|
args.sort_by(|a, b| a.name().cmp(b.name()));
|
|
args.sort_by(|a, b| a.wrapped().cmp(&b.wrapped()));
|
|
args.sort_unstable_by(|a, b| a.name().cmp(b.name()));
|
|
args.sort_unstable_by(|a, b| a.wrapped().cmp(&b.wrapped()));
|
|
// Reverse
|
|
args.sort_by(|a, b| b.name().cmp(a.name()));
|
|
args.sort_by(|a, b| b.wrapped().cmp(&a.wrapped()));
|
|
args.sort_unstable_by(|a, b| b.name().cmp(a.name()));
|
|
args.sort_unstable_by(|a, b| b.wrapped().cmp(&a.wrapped()));
|
|
}
|
|
}
|
|
|
|
// The closure parameter is not dereferenced anymore, so non-Copy types can be linted
|
|
mod issue_6001 {
|
|
struct Test(String);
|
|
|
|
impl Test {
|
|
// Return an owned type so that we don't hit the fix for 5754
|
|
fn name(&self) -> String {
|
|
self.0.clone()
|
|
}
|
|
}
|
|
|
|
pub fn test() {
|
|
let mut args: Vec<Test> = vec![];
|
|
|
|
// Forward
|
|
args.sort_by_key(|a| a.name());
|
|
args.sort_unstable_by_key(|a| a.name());
|
|
// Reverse
|
|
args.sort_by_key(|b| std::cmp::Reverse(b.name()));
|
|
args.sort_unstable_by_key(|b| std::cmp::Reverse(b.name()));
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
unnecessary_sort_by();
|
|
issue_5754::test();
|
|
issue_6001::test();
|
|
}
|