pub trait WrappingNeg: Sized {
    // Required method
    fn wrapping_neg(&self) -> Self;
}
Expand description

Performs a negation that does not panic.

Required Methods§

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fn wrapping_neg(&self) -> Self

Wrapping (modular) negation. Computes -self, wrapping around at the boundary of the type.

Since unsigned types do not have negative equivalents all applications of this function will wrap (except for -0). For values smaller than the corresponding signed type’s maximum the result is the same as casting the corresponding signed value. Any larger values are equivalent to MAX + 1 - (val - MAX - 1) where MAX is the corresponding signed type’s maximum.

use num_traits::WrappingNeg;

assert_eq!(100i8.wrapping_neg(), -100);
assert_eq!((-100i8).wrapping_neg(), 100);
assert_eq!((-128i8).wrapping_neg(), -128); // wrapped!

Implementations on Foreign Types§

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impl WrappingNeg for u64

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impl WrappingNeg for u128

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impl WrappingNeg for usize

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impl WrappingNeg for u32

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impl WrappingNeg for i8

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impl WrappingNeg for u16

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impl WrappingNeg for i64

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impl WrappingNeg for u8

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impl<T: WrappingNeg> WrappingNeg for Wrapping<T>where Wrapping<T>: Neg<Output = Wrapping<T>>,

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fn wrapping_neg(&self) -> Self

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impl WrappingNeg for i16

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impl WrappingNeg for isize

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impl WrappingNeg for i32

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impl WrappingNeg for i128

Implementors§