method isize.checked_sub

Checked subtraction: the difference, or none on overflow.

Example:

fn main() io {
  let max: isize = 9223372036854775807
  let min: isize = -9223372036854775808
  print("{min.checked_sub(1)}")
  print("{(min + 1).checked_sub(1)}")
}

none
-9223372036854775808

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

Complexity. O(1).

Since. 1.0.0-beta

Parameters

Returns

isize?

Effects

none declared (pure unless the body says otherwise)

Defined in: std/core/numbers.oxl:1413