Trait CheckedNeg

pub trait CheckedNeg: Sized {
    // Required method
    fn checked_neg(&self) -> Option<Self>;
}

Performs negation that returns None if the result can’t be represented.

Required Methods

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);

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl CheckedNeg for i8

fn checked_neg(&self) -> Option<i8>

impl CheckedNeg for i16

fn checked_neg(&self) -> Option<i16>

impl CheckedNeg for i32

fn checked_neg(&self) -> Option<i32>

impl CheckedNeg for i64

fn checked_neg(&self) -> Option<i64>

impl CheckedNeg for i128

fn checked_neg(&self) -> Option<i128>

impl CheckedNeg for isize

fn checked_neg(&self) -> Option<isize>

impl CheckedNeg for u8

fn checked_neg(&self) -> Option<u8>

impl CheckedNeg for u16

fn checked_neg(&self) -> Option<u16>

impl CheckedNeg for u32

fn checked_neg(&self) -> Option<u32>

impl CheckedNeg for u64

fn checked_neg(&self) -> Option<u64>

impl CheckedNeg for u128

fn checked_neg(&self) -> Option<u128>

impl CheckedNeg for usize

fn checked_neg(&self) -> Option<usize>

Implementors