nuit_core/utils/
approx_eq.rs

1/// A trait for approximate equality.
2pub trait ApproxEq<Rhs = Self> {
3    /// Whether the value is within the tolerance of the other one.
4    fn approx_eq(&self, other: &Rhs, tolerance: f64) -> bool;
5}
6
7macro_rules! impl_primitive_approx_eq {
8    ($($tys:ty),*) => {
9        $(impl ApproxEq for $tys {
10            fn approx_eq(&self, other: &Self, tolerance: f64) -> bool {
11                ((self - other) as f64).abs() <= tolerance
12            }
13        })*
14    };
15}
16
17#[macro_export]
18macro_rules! assert_approx_eq {
19    ($e1:expr, $e2:expr, $tolerance:expr) => {
20        assert!($crate::ApproxEq::approx_eq(&$e1, &$e2, $tolerance), "Assertion failed: Not approximately equal\n  Left:  {:?}\n  Right: {:?}",  $e1, $e2);
21    };
22    ($e1:expr, $e2:expr) => {
23        assert_approx_eq!($e1, $e2, 0.00000001);
24    };
25}
26
27impl_primitive_approx_eq!(
28    u8, u16, u32, u64, u128, usize,
29    i8, i16, i32, i64, i128, isize,
30    f32, f64
31);
nuit_core/utils/approx_eq.rs

nuit_core/utils/
approx_eq.rs
