mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-09-20 14:41:58 +00:00
101 lines
3.1 KiB
Rust
101 lines
3.1 KiB
Rust
#![allow(clippy::stable_sort_primitive, clippy::useless_vec)]
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use std::cell::Ref;
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fn unnecessary_sort_by() {
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fn id(x: isize) -> isize {
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x
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}
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let mut vec: Vec<isize> = vec![3, 6, 1, 2, 5];
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// Forward examples
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vec.sort_by(|a, b| a.cmp(b));
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vec.sort_unstable_by(|a, b| a.cmp(b));
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vec.sort_by(|a, b| (a + 5).abs().cmp(&(b + 5).abs()));
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vec.sort_unstable_by(|a, b| id(-a).cmp(&id(-b)));
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// Reverse examples
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vec.sort_by(|a, b| b.cmp(a)); // not linted to avoid suggesting `Reverse(b)` which would borrow
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vec.sort_by(|a, b| (b + 5).abs().cmp(&(a + 5).abs()));
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vec.sort_unstable_by(|a, b| id(-b).cmp(&id(-a)));
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// Negative examples (shouldn't be changed)
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let c = &7;
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vec.sort_by(|a, b| (b - a).cmp(&(a - b)));
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vec.sort_by(|_, b| b.cmp(&5));
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vec.sort_by(|_, b| b.cmp(c));
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vec.sort_unstable_by(|a, _| a.cmp(c));
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// Vectors of references are fine as long as the resulting key does not borrow
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let mut vec: Vec<&&&isize> = vec![&&&3, &&&6, &&&1, &&&2, &&&5];
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vec.sort_by(|a, b| (***a).abs().cmp(&(***b).abs()));
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vec.sort_unstable_by(|a, b| (***a).abs().cmp(&(***b).abs()));
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// `Reverse(b)` would borrow in the following cases, don't lint
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vec.sort_by(|a, b| b.cmp(a));
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vec.sort_unstable_by(|a, b| b.cmp(a));
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// No warning if element does not implement `Ord`
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let mut vec: Vec<Ref<usize>> = Vec::new();
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vec.sort_unstable_by(|a, b| a.cmp(b));
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}
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// Do not suggest returning a reference to the closure parameter of `Vec::sort_by_key`
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mod issue_5754 {
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#[derive(Clone, Copy)]
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struct Test(usize);
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#[derive(PartialOrd, Ord, PartialEq, Eq)]
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struct Wrapper<'a>(&'a usize);
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impl Test {
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fn name(&self) -> &usize {
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&self.0
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}
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fn wrapped(&self) -> Wrapper<'_> {
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Wrapper(&self.0)
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}
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}
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pub fn test() {
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let mut args: Vec<Test> = vec![];
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// Forward
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args.sort_by(|a, b| a.name().cmp(b.name()));
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args.sort_by(|a, b| a.wrapped().cmp(&b.wrapped()));
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args.sort_unstable_by(|a, b| a.name().cmp(b.name()));
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args.sort_unstable_by(|a, b| a.wrapped().cmp(&b.wrapped()));
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// Reverse
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args.sort_by(|a, b| b.name().cmp(a.name()));
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args.sort_by(|a, b| b.wrapped().cmp(&a.wrapped()));
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args.sort_unstable_by(|a, b| b.name().cmp(a.name()));
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args.sort_unstable_by(|a, b| b.wrapped().cmp(&a.wrapped()));
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}
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}
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// The closure parameter is not dereferenced anymore, so non-Copy types can be linted
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mod issue_6001 {
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struct Test(String);
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impl Test {
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// Return an owned type so that we don't hit the fix for 5754
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fn name(&self) -> String {
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self.0.clone()
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}
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}
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pub fn test() {
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let mut args: Vec<Test> = vec![];
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// Forward
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args.sort_by(|a, b| a.name().cmp(&b.name()));
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args.sort_unstable_by(|a, b| a.name().cmp(&b.name()));
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// Reverse
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args.sort_by(|a, b| b.name().cmp(&a.name()));
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args.sort_unstable_by(|a, b| b.name().cmp(&a.name()));
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}
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}
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fn main() {
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unnecessary_sort_by();
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issue_5754::test();
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issue_6001::test();
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}
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