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

   1
   2
   3
   4 #![warn(float_cmp)]
   5 #![allow(unused, no_effect, unnecessary_operation, cast_lossless)]
   6
   7 use std::ops::Add;
   8
   9 const ZERO : f32 = 0.0;
  10 const ONE : f32 = ZERO + 1.0;
  11
  12 fn twice<T>(x : T) -> T where T : Add<T, Output = T>, T : Copy {
  13     x + x
  14 }
  15
  16 fn eq_fl(x: f32, y: f32) -> bool {
  17     if x.is_nan() { y.is_nan() } else { x == y } // no error, inside "eq" fn
  18 }
  19
  20 fn fl_eq(x: f32, y: f32) -> bool {
  21     if x.is_nan() { y.is_nan() } else { x == y } // no error, inside "eq" fn
  22 }
  23
  24 struct X { val: f32 }
  25
  26 impl PartialEq for X {
  27     fn eq(&self, o: &X) -> bool {
  28         if self.val.is_nan() {
  29             o.val.is_nan()
  30         } else {
  31             self.val == o.val // no error, inside "eq" fn
  32         }
  33     }
  34 }
  35
  36 fn main() {
  37     ZERO == 0f32; //no error, comparison with zero is ok
  38     1.0f32 != ::std::f32::INFINITY; // also comparison with infinity
  39     1.0f32 != ::std::f32::NEG_INFINITY; // and negative infinity
  40     ZERO == 0.0; //no error, comparison with zero is ok
  41     ZERO + ZERO != 1.0; //no error, comparison with zero is ok
  42
  43     ONE == 1f32;
  44     ONE == 1.0 + 0.0;
  45     ONE + ONE == ZERO + ONE + ONE;
  46     ONE != 2.0;
  47     ONE != 0.0; // no error, comparison with zero is ok
  48     twice(ONE) != ONE;
  49     ONE as f64 != 2.0;
  50     ONE as f64 != 0.0; // no error, comparison with zero is ok
  51
  52     let x : f64 = 1.0;
  53
  54     x == 1.0;
  55     x != 0f64; // no error, comparison with zero is ok
  56
  57     twice(x) != twice(ONE as f64);
  58
  59     x < 0.0; // no errors, lower or greater comparisons need no fuzzyness
  60     x > 0.0;
  61     x <= 0.0;
  62     x >= 0.0;
  63
  64     let xs : [f32; 1] = [0.0];
  65     let a: *const f32 = xs.as_ptr();
  66     let b: *const f32 = xs.as_ptr();
  67
  68     assert_eq!(a, b); // no errors
  69 }