Trait num_traits::ops::checked::CheckedNeg [−][src]
pub trait CheckedNeg: Sized {
fn checked_neg(&self) -> Option<Self>;
}Expand description
Performs negation that returns None if the result can’t be represented.
Required methods
fn checked_neg(&self) -> Option<Self>
fn checked_neg(&self) -> Option<Self>
Negates a number, returning None for results that can’t be represented, like signed MIN
values that can’t be positive, or non-zero unsigned values that can’t be negative.
Examples
use num_traits::CheckedNeg;
use std::i32::MIN;
assert_eq!(CheckedNeg::checked_neg(&1_i32), Some(-1));
assert_eq!(CheckedNeg::checked_neg(&-1_i32), Some(1));
assert_eq!(CheckedNeg::checked_neg(&MIN), None);
assert_eq!(CheckedNeg::checked_neg(&0_u32), Some(0));
assert_eq!(CheckedNeg::checked_neg(&1_u32), None);