macro_rules! const_assert_eq { ($x:expr, $($y:expr),+ $(,)?) => { ... }; }
Expand description
Asserts that constants are equal in value.
Use const_assert_eq_usize!
for better
error messages when asserting
usize
equality.
Examples
This works as a shorthand for const_assert!(a == b)
:
const TWO: i32 = 2;
const_assert_eq!(TWO * TWO, TWO + TWO);
Just because 2 × 2 = 2 + 2 doesn’t mean it holds true for other numbers:
ⓘ
const_assert_eq!(4 + 4, 4 * 4);