method i32.checked_sub

Checked subtraction: the difference, or none on overflow.

Example:

oxl✓ checked in CI

fn main() io {
  let max: i32 = 2147483647
  let min: i32 = -2147483648
  print("{min.checked_sub(1)}")
  print("{(min + 1).checked_sub(1)}")
}

Output

none
-2147483648

pub(api) fn checked_sub(o: i32) -> i32?

Complexity. O(1).

Since. 1.0.0-beta

Parameters

Name	Type
`o`	`i32`

i32?

none declared (pure unless the body says otherwise)

Defined in: std/core/numbers.oxl:384