src/tools/clippy/tests/ui/swap.rs

   1 // run-rustfix
   2
   3 #![warn(clippy::all)]
   4 #![allow(
   5     clippy::blacklisted_name,
   6     clippy::no_effect,
   7     clippy::redundant_clone,
   8     redundant_semicolons,
   9     unused_assignments
  10 )]
  11
  12 struct Foo(u32);
  13
  14 #[derive(Clone)]
  15 struct Bar {
  16     a: u32,
  17     b: u32,
  18 }
  19
  20 fn field() {
  21     let mut bar = Bar { a: 1, b: 2 };
  22
  23     let temp = bar.a;
  24     bar.a = bar.b;
  25     bar.b = temp;
  26
  27     let mut baz = vec![bar.clone(), bar.clone()];
  28     let temp = baz[0].a;
  29     baz[0].a = baz[1].a;
  30     baz[1].a = temp;
  31 }
  32
  33 fn array() {
  34     let mut foo = [1, 2];
  35     let temp = foo[0];
  36     foo[0] = foo[1];
  37     foo[1] = temp;
  38
  39     foo.swap(0, 1);
  40 }
  41
  42 fn slice() {
  43     let foo = &mut [1, 2];
  44     let temp = foo[0];
  45     foo[0] = foo[1];
  46     foo[1] = temp;
  47
  48     foo.swap(0, 1);
  49 }
  50
  51 fn unswappable_slice() {
  52     let foo = &mut [vec![1, 2], vec![3, 4]];
  53     let temp = foo[0][1];
  54     foo[0][1] = foo[1][0];
  55     foo[1][0] = temp;
  56
  57     // swap(foo[0][1], foo[1][0]) would fail
  58 }
  59
  60 fn vec() {
  61     let mut foo = vec![1, 2];
  62     let temp = foo[0];
  63     foo[0] = foo[1];
  64     foo[1] = temp;
  65
  66     foo.swap(0, 1);
  67 }
  68
  69 #[rustfmt::skip]
  70 fn main() {
  71     field();
  72     array();
  73     slice();
  74     unswappable_slice();
  75     vec();
  76
  77     let mut a = 42;
  78     let mut b = 1337;
  79
  80     a = b;
  81     b = a;
  82
  83     ; let t = a;
  84     a = b;
  85     b = t;
  86
  87     let mut c = Foo(42);
  88
  89     c.0 = a;
  90     a = c.0;
  91
  92     ; let t = c.0;
  93     c.0 = a;
  94     a = t;
  95 }