method i8.checked_sub

Checked subtraction: the difference, or none on overflow.

Example:

oxl✓ checked in CI

fn main() io {
  let max: i8 = 127
  let min: i8 = -128
  print("{min.checked_sub(1)}")
  print("{(min + 1).checked_sub(1)}")
}

Output

none
-128

pub(api) fn checked_sub(o: i8) -> i8?

Complexity. O(1).

Since. 1.0.0-beta

Parameters

Name	Type
`o`	`i8`

i8?

none declared (pure unless the body says otherwise)

Defined in: std/core/numbers.oxl:1070