method u128.checked_mul

Checked multiplication: the product, or none on overflow.

Example:

fn main() io {
  let max: u128 = 340282366920938463463374607431768211455
  let min: u128 = 0
  print("{max.checked_mul(2)}")
  print("{(10 as u128).checked_mul(2)}")
}

none
20

pub(api) fn checked_mul(o: u128) -> u128?

Complexity. O(1).

Since. 1.0.0-beta

Parameters

Returns

u128?

Effects

none declared (pure unless the body says otherwise)

Defined in: std/core/numbers.oxl:3667