num::traits

Trait num::traits::CheckedSub [-] [+] [src]

pub trait CheckedSub: Sub<Self, Output=Self> {
    fn checked_sub(&self, v: &Self) -> Option<Self>;
}

Performs subtraction that returns None instead of wrapping around on underflow.

Required Methods

fn checked_sub(&self, v: &Self) -> Option<Self>

Subtracts two numbers, checking for underflow. If underflow happens, None is returned.

Implementors