167 lines
3.2 KiB
Rust
167 lines
3.2 KiB
Rust
// run-rustfix
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#![warn(clippy::all)]
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#![allow(
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clippy::disallowed_names,
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clippy::no_effect,
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clippy::redundant_clone,
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redundant_semicolons,
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dead_code,
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unused_assignments
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)]
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struct Foo(u32);
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#[derive(Clone)]
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struct Bar {
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a: u32,
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b: u32,
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}
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fn field() {
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let mut bar = Bar { a: 1, b: 2 };
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std::mem::swap(&mut bar.a, &mut bar.b);
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let mut baz = vec![bar.clone(), bar.clone()];
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let temp = baz[0].a;
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baz[0].a = baz[1].a;
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baz[1].a = temp;
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}
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fn array() {
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let mut foo = [1, 2];
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foo.swap(0, 1);
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foo.swap(0, 1);
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}
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fn slice() {
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let foo = &mut [1, 2];
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foo.swap(0, 1);
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foo.swap(0, 1);
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}
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fn unswappable_slice() {
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let foo = &mut [vec![1, 2], vec![3, 4]];
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let temp = foo[0][1];
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foo[0][1] = foo[1][0];
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foo[1][0] = temp;
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// swap(foo[0][1], foo[1][0]) would fail
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// this could use split_at_mut and mem::swap, but that is not much simpler.
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}
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fn vec() {
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let mut foo = vec![1, 2];
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foo.swap(0, 1);
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foo.swap(0, 1);
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}
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fn xor_swap_locals() {
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// This is an xor-based swap of local variables.
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let mut a = 0;
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let mut b = 1;
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std::mem::swap(&mut a, &mut b)
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}
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fn xor_field_swap() {
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// This is an xor-based swap of fields in a struct.
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let mut bar = Bar { a: 0, b: 1 };
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std::mem::swap(&mut bar.a, &mut bar.b)
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}
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fn xor_slice_swap() {
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// This is an xor-based swap of a slice
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let foo = &mut [1, 2];
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foo.swap(0, 1)
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}
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fn xor_no_swap() {
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// This is a sequence of xor-assignment statements that doesn't result in a swap.
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let mut a = 0;
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let mut b = 1;
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let mut c = 2;
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a ^= b;
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b ^= c;
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a ^= c;
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c ^= a;
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}
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fn xor_unswappable_slice() {
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let foo = &mut [vec![1, 2], vec![3, 4]];
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foo[0][1] ^= foo[1][0];
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foo[1][0] ^= foo[0][0];
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foo[0][1] ^= foo[1][0];
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// swap(foo[0][1], foo[1][0]) would fail
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// this could use split_at_mut and mem::swap, but that is not much simpler.
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}
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fn distinct_slice() {
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let foo = &mut [vec![1, 2], vec![3, 4]];
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let bar = &mut [vec![1, 2], vec![3, 4]];
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std::mem::swap(&mut foo[0][1], &mut bar[1][0]);
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}
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#[rustfmt::skip]
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fn main() {
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let mut a = 42;
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let mut b = 1337;
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std::mem::swap(&mut a, &mut b);
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; std::mem::swap(&mut a, &mut b);
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let mut c = Foo(42);
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std::mem::swap(&mut c.0, &mut a);
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; std::mem::swap(&mut c.0, &mut a);
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}
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fn issue_8154() {
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struct S1 {
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x: i32,
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y: i32,
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}
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struct S2(S1);
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struct S3<'a, 'b>(&'a mut &'b mut S1);
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impl std::ops::Deref for S2 {
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type Target = S1;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl std::ops::DerefMut for S2 {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.0
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}
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}
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// Don't lint. `s.0` is mutably borrowed by `s.x` and `s.y` via the deref impl.
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let mut s = S2(S1 { x: 0, y: 0 });
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let t = s.x;
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s.x = s.y;
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s.y = t;
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// Accessing through a mutable reference is fine
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let mut s = S1 { x: 0, y: 0 };
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let mut s = &mut s;
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let s = S3(&mut s);
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std::mem::swap(&mut s.0.x, &mut s.0.y);
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}
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const fn issue_9864(mut u: u32) -> u32 {
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let mut v = 10;
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let temp = u;
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u = v;
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v = temp;
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u + v
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}
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