Trait sp_runtime::traits::CheckedSub [−][src]
pub trait CheckedSub: Sub<Self, Output = Self> { fn checked_sub(&self, v: &Self) -> Option<Self>; }
Expand description
Performs subtraction that returns None
instead of wrapping around on underflow.
Required methods
fn checked_sub(&self, v: &Self) -> Option<Self>
fn checked_sub(&self, v: &Self) -> Option<Self>
Subtracts two numbers, checking for underflow. If underflow happens,
None
is returned.