# 1.0.0[−][src]Trait std::ops::Neg

    #[lang = "neg"]
    pub trait Neg {
        type Output;
    #[must_use]
        fn neg(self) -> Self::Output;
    }

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 = Sign;

        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);

Run

## Associated Types

### `type Output`

The resulting type after applying the `-` operator.

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## Required methods

### `#[must_use] fn neg(self) -> Self::Output`

Performs the unary `-` operation.

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## Implementors

### `impl Neg for f32`[src]

#### `type Output = f32`

#### `fn neg(self) -> f32`[src]

### `impl Neg for f64`[src]

#### `type Output = f64`

#### `fn neg(self) -> f64`[src]

### `impl Neg for i128`[src]

#### `type Output = i128`

#### `fn neg(self) -> i128`[src]

### `impl Neg for i16`[src]

#### `type Output = i16`

#### `fn neg(self) -> i16`[src]

### `impl Neg for i32`[src]

#### `type Output = i32`

#### `fn neg(self) -> i32`[src]

### `impl Neg for i64`[src]

#### `type Output = i64`

#### `fn neg(self) -> i64`[src]

### `impl Neg for i8`[src]

#### `type Output = i8`

#### `fn neg(self) -> i8`[src]

### `impl Neg for isize`[src]

#### `type Output = isize`

#### `fn neg(self) -> isize`[src]

### `impl Neg for Wrapping<i128>`[src]

#### `type Output = Wrapping<i128>`

#### `fn neg(self) -> Wrapping<i128>`[src]

### `impl Neg for Wrapping<i16>`[src]

#### `type Output = Wrapping<i16>`

#### `fn neg(self) -> Wrapping<i16>`[src]

### `impl Neg for Wrapping<i32>`[src]

#### `type Output = Wrapping<i32>`

#### `fn neg(self) -> Wrapping<i32>`[src]

### `impl Neg for Wrapping<i64>`[src]

#### `type Output = Wrapping<i64>`

#### `fn neg(self) -> Wrapping<i64>`[src]

### `impl Neg for Wrapping<i8>`[src]

#### `type Output = Wrapping<i8>`

#### `fn neg(self) -> Wrapping<i8>`[src]

### `impl Neg for Wrapping<isize>`[src]

#### `type Output = Wrapping<isize>`

#### `fn neg(self) -> Wrapping<isize>`[src]

### `impl Neg for Wrapping<u128>`[src]

#### `type Output = Wrapping<u128>`

#### `fn neg(self) -> Wrapping<u128>`[src]

### `impl Neg for Wrapping<u16>`[src]

#### `type Output = Wrapping<u16>`

#### `fn neg(self) -> Wrapping<u16>`[src]

### `impl Neg for Wrapping<u32>`[src]

#### `type Output = Wrapping<u32>`

#### `fn neg(self) -> Wrapping<u32>`[src]

### `impl Neg for Wrapping<u64>`[src]

#### `type Output = Wrapping<u64>`

#### `fn neg(self) -> Wrapping<u64>`[src]

### `impl Neg for Wrapping<u8>`[src]

#### `type Output = Wrapping<u8>`

#### `fn neg(self) -> Wrapping<u8>`[src]

### `impl Neg for Wrapping<usize>`[src]

#### `type Output = Wrapping<usize>`

#### `fn neg(self) -> Wrapping<usize>`[src]

### `impl<'_> Neg for &'_ f32`[src]

#### `type Output = <f32 as Neg>::Output`

#### `fn neg(self) -> <f32 as Neg>::Output`[src]

### `impl<'_> Neg for &'_ f64`[src]

#### `type Output = <f64 as Neg>::Output`

#### `fn neg(self) -> <f64 as Neg>::Output`[src]

### `impl<'_> Neg for &'_ i128`[src]

#### `type Output = <i128 as Neg>::Output`

#### `fn neg(self) -> <i128 as Neg>::Output`[src]

### `impl<'_> Neg for &'_ i16`[src]

#### `type Output = <i16 as Neg>::Output`

#### `fn neg(self) -> <i16 as Neg>::Output`[src]

### `impl<'_> Neg for &'_ i32`[src]

#### `type Output = <i32 as Neg>::Output`

#### `fn neg(self) -> <i32 as Neg>::Output`[src]

### `impl<'_> Neg for &'_ i64`[src]

#### `type Output = <i64 as Neg>::Output`

#### `fn neg(self) -> <i64 as Neg>::Output`[src]

### `impl<'_> Neg for &'_ i8`[src]

#### `type Output = <i8 as Neg>::Output`

#### `fn neg(self) -> <i8 as Neg>::Output`[src]

### `impl<'_> Neg for &'_ isize`[src]

#### `type Output = <isize as Neg>::Output`

#### `fn neg(self) -> <isize as Neg>::Output`[src]

### `impl<'_> Neg for &'_ Wrapping<i128>`[src]

#### `type Output = <Wrapping<i128> as Neg>::Output`

#### `fn neg(self) -> <Wrapping<i128> as Neg>::Output`[src]

### `impl<'_> Neg for &'_ Wrapping<i16>`[src]

#### `type Output = <Wrapping<i16> as Neg>::Output`

#### `fn neg(self) -> <Wrapping<i16> as Neg>::Output`[src]

### `impl<'_> Neg for &'_ Wrapping<i32>`[src]

#### `type Output = <Wrapping<i32> as Neg>::Output`

#### `fn neg(self) -> <Wrapping<i32> as Neg>::Output`[src]

### `impl<'_> Neg for &'_ Wrapping<i64>`[src]

#### `type Output = <Wrapping<i64> as Neg>::Output`

#### `fn neg(self) -> <Wrapping<i64> as Neg>::Output`[src]

### `impl<'_> Neg for &'_ Wrapping<i8>`[src]

#### `type Output = <Wrapping<i8> as Neg>::Output`

#### `fn neg(self) -> <Wrapping<i8> as Neg>::Output`[src]

### `impl<'_> Neg for &'_ Wrapping<isize>`[src]

#### `type Output = <Wrapping<isize> as Neg>::Output`

#### `fn neg(self) -> <Wrapping<isize> as Neg>::Output`[src]

### `impl<'_> Neg for &'_ Wrapping<u128>`[src]

#### `type Output = <Wrapping<u128> as Neg>::Output`

#### `fn neg(self) -> <Wrapping<u128> as Neg>::Output`[src]

### `impl<'_> Neg for &'_ Wrapping<u16>`[src]

#### `type Output = <Wrapping<u16> as Neg>::Output`

#### `fn neg(self) -> <Wrapping<u16> as Neg>::Output`[src]

### `impl<'_> Neg for &'_ Wrapping<u32>`[src]

#### `type Output = <Wrapping<u32> as Neg>::Output`

#### `fn neg(self) -> <Wrapping<u32> as Neg>::Output`[src]

### `impl<'_> Neg for &'_ Wrapping<u64>`[src]

#### `type Output = <Wrapping<u64> as Neg>::Output`

#### `fn neg(self) -> <Wrapping<u64> as Neg>::Output`[src]

### `impl<'_> Neg for &'_ Wrapping<u8>`[src]

#### `type Output = <Wrapping<u8> as Neg>::Output`

#### `fn neg(self) -> <Wrapping<u8> as Neg>::Output`[src]

### `impl<'_> Neg for &'_ Wrapping<usize>`[src]

#### `type Output = <Wrapping<usize> as Neg>::Output`

#### `fn neg(self) -> <Wrapping<usize> as Neg>::Output`[src]

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