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

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

Required Methods§

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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);

Implementations on Foreign Types§

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impl CheckedNeg for u16

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impl CheckedNeg for i16

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impl CheckedNeg for u32

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impl CheckedNeg for u64

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impl CheckedNeg for u128

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impl CheckedNeg for i8

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impl CheckedNeg for usize

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impl CheckedNeg for u8

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impl CheckedNeg for i128

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impl CheckedNeg for i64

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impl CheckedNeg for i32

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impl CheckedNeg for isize

Implementors§