diff options
Diffstat (limited to 'src/docs/float_cmp_const.txt')
| -rw-r--r-- | src/docs/float_cmp_const.txt | 26 |
1 files changed, 0 insertions, 26 deletions
diff --git a/src/docs/float_cmp_const.txt b/src/docs/float_cmp_const.txt deleted file mode 100644 index 9208feaacd8..00000000000 --- a/src/docs/float_cmp_const.txt +++ /dev/null @@ -1,26 +0,0 @@ -### What it does -Checks for (in-)equality comparisons on floating-point -value and constant, except in functions called `*eq*` (which probably -implement equality for a type involving floats). - -### Why is this bad? -Floating point calculations are usually imprecise, so -asking if two values are *exactly* equal is asking for trouble. For a good -guide on what to do, see [the floating point -guide](http://www.floating-point-gui.de/errors/comparison). - -### Example -``` -let x: f64 = 1.0; -const ONE: f64 = 1.00; - -if x == ONE { } // where both are floats -``` - -Use instead: -``` -let error_margin = f64::EPSILON; // Use an epsilon for comparison -// Or, if Rust <= 1.42, use `std::f64::EPSILON` constant instead. -// let error_margin = std::f64::EPSILON; -if (x - ONE).abs() < error_margin { } -``` \ No newline at end of file |