Trait num::traits::CheckedNeg[−][src]

pub trait CheckedNeg {
    pub fn checked_neg(&self) -> Option<Self>;
}

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

Required methods

`pub fn checked_neg(&self) -> Option<Self>`[src]

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);

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Implementations on Foreign Types

`impl CheckedNeg for i32`[src]

`pub fn checked_neg(&self) -> Option<i32>`[src]

`impl CheckedNeg for u16`[src]

`pub fn checked_neg(&self) -> Option<u16>`[src]

`impl CheckedNeg for i64`[src]

`pub fn checked_neg(&self) -> Option<i64>`[src]

`impl CheckedNeg for i8`[src]

`pub fn checked_neg(&self) -> Option<i8>`[src]

`impl CheckedNeg for i128`[src]

`pub fn checked_neg(&self) -> Option<i128>`[src]

`impl CheckedNeg for u32`[src]

`pub fn checked_neg(&self) -> Option<u32>`[src]

`impl CheckedNeg for u8`[src]

`pub fn checked_neg(&self) -> Option<u8>`[src]

`impl CheckedNeg for u64`[src]

`pub fn checked_neg(&self) -> Option<u64>`[src]

`impl CheckedNeg for isize`[src]

`pub fn checked_neg(&self) -> Option<isize>`[src]

`impl CheckedNeg for u128`[src]

`pub fn checked_neg(&self) -> Option<u128>`[src]

`impl CheckedNeg for i16`[src]

`pub fn checked_neg(&self) -> Option<i16>`[src]

`impl CheckedNeg for usize`[src]

`pub fn checked_neg(&self) -> Option<usize>`[src]

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Implementors

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