method isize.checked_mul

Checked multiplication: the product, or none on overflow.

Example:

fn main() io {
  let max: isize = 9223372036854775807
  let min: isize = -9223372036854775808
  print("{max.checked_mul(2)}")
  print("{(10 as isize).checked_mul(2)}")
}

none
20

pub(api) fn checked_mul(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:1431