std::ops

Trait Neg

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pub trait Neg {
    type Output;

    // Required method
    fn neg(self) -> Self::Output;
}
Expand description

The unary negation operator -.

§Examples

An implementation of Neg for Sign, which allows the use of - to negate its value.

use std::ops::Neg;

#[derive(Debug, PartialEq)]
enum Sign {
    Negative,
    Zero,
    Positive,
}

impl Neg for Sign {
    type Output = Self;

    fn neg(self) -> Self::Output {
        match self {
            Sign::Negative => Sign::Positive,
            Sign::Zero => Sign::Zero,
            Sign::Positive => Sign::Negative,
        }
    }
}

// A negative positive is a negative.
assert_eq!(-Sign::Positive, Sign::Negative);
// A double negative is a positive.
assert_eq!(-Sign::Negative, Sign::Positive);
// Zero is its own negation.
assert_eq!(-Sign::Zero, Sign::Zero);

Required Associated Types§

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type Output

The resulting type after applying the - operator.

Required Methods§

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fn neg(self) -> Self::Output

Performs the unary - operation.

§Example
let x: i32 = 12;
assert_eq!(-x, -12);

Implementors§

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impl Neg for &f16

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impl Neg for &f32

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impl Neg for &f64

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impl Neg for &f128

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impl Neg for &i8

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impl Neg for &i16

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impl Neg for &i32

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impl Neg for &i64

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impl Neg for &i128

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impl Neg for &isize

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impl Neg for &NonZero<i8>

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impl Neg for &NonZero<i16>

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impl Neg for &NonZero<i32>

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impl Neg for &NonZero<i64>

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impl Neg for &NonZero<i128>

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impl Neg for &NonZero<isize>

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impl Neg for &Saturating<i8>

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impl Neg for &Saturating<i16>

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impl Neg for &Saturating<i32>

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impl Neg for &Saturating<i64>

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impl Neg for &Saturating<i128>

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impl Neg for &Saturating<isize>

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impl Neg for &Wrapping<i8>

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impl Neg for &Wrapping<i16>

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impl Neg for &Wrapping<i32>

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impl Neg for &Wrapping<i64>

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impl Neg for &Wrapping<i128>

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impl Neg for &Wrapping<isize>

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impl Neg for &Wrapping<u8>

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impl Neg for &Wrapping<u16>

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impl Neg for &Wrapping<u32>

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impl Neg for &Wrapping<u64>

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impl Neg for &Wrapping<u128>

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impl Neg for &Wrapping<usize>

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impl Neg for f16

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impl Neg for f32

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impl Neg for f64

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impl Neg for f128

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impl Neg for i8

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impl Neg for i16

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impl Neg for i32

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impl Neg for i64

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impl Neg for i128

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impl Neg for isize

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impl Neg for NonZero<i8>

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impl Neg for NonZero<i16>

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impl Neg for NonZero<i32>

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impl Neg for NonZero<i64>

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impl Neg for NonZero<i128>

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impl Neg for NonZero<isize>

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impl Neg for Saturating<i8>

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impl Neg for Saturating<i16>

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impl Neg for Saturating<i32>

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impl Neg for Saturating<i64>

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impl Neg for Saturating<i128>

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impl Neg for Saturating<isize>

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impl Neg for Wrapping<i8>

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impl Neg for Wrapping<i16>

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impl Neg for Wrapping<i32>

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impl Neg for Wrapping<i64>

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impl Neg for Wrapping<i128>

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impl Neg for Wrapping<isize>

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impl Neg for Wrapping<u8>

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impl Neg for Wrapping<u16>

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impl Neg for Wrapping<u32>

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impl Neg for Wrapping<u64>

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impl Neg for Wrapping<u128>

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impl Neg for Wrapping<usize>

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impl<const N: usize> Neg for Simd<f32, N>

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impl<const N: usize> Neg for Simd<f64, N>

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impl<const N: usize> Neg for Simd<i8, N>

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impl<const N: usize> Neg for Simd<i16, N>

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impl<const N: usize> Neg for Simd<i32, N>

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impl<const N: usize> Neg for Simd<i64, N>

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impl<const N: usize> Neg for Simd<isize, N>