`#[repr(transparent)]pub struct NonZeroI8(_);`

## Expand description

An integer that is known not to equal zero.

This enables some memory layout optimization.
For example, `Option<NonZeroI8>`

is the same size as `i8`

:

```
use std::mem::size_of;
assert_eq!(size_of::<Option<core::num::NonZeroI8>>(), size_of::<i8>());
```

Run## Implementations

source### impl NonZeroI8

### impl NonZeroI8

const: 1.34.0 · source#### pub const unsafe fn new_unchecked(n: i8) -> NonZeroI8

#### pub const unsafe fn new_unchecked(n: i8) -> NonZeroI8

Creates a non-zero without checking whether the value is non-zero. This results in undefined behaviour if the value is zero.

##### Safety

The value must not be zero.

source### impl NonZeroI8

### impl NonZeroI8

1.53.0 (const: 1.53.0) · source#### pub const fn leading_zeros(self) -> u32

#### pub const fn leading_zeros(self) -> u32

Returns the number of leading zeros in the binary representation of `self`

.

On many architectures, this function can perform better than `leading_zeros()`

on the underlying integer type, as special handling of zero can be avoided.

##### Examples

Basic usage:

```
let n = std::num::NonZeroI8::new(-1i8).unwrap();
assert_eq!(n.leading_zeros(), 0);
```

Run1.53.0 (const: 1.53.0) · source#### pub const fn trailing_zeros(self) -> u32

#### pub const fn trailing_zeros(self) -> u32

Returns the number of trailing zeros in the binary representation
of `self`

.

On many architectures, this function can perform better than `trailing_zeros()`

on the underlying integer type, as special handling of zero can be avoided.

##### Examples

Basic usage:

```
let n = std::num::NonZeroI8::new(0b0101000).unwrap();
assert_eq!(n.trailing_zeros(), 3);
```

Runsource### impl NonZeroI8

### impl NonZeroI8

source#### pub const fn checked_abs(self) -> Option<NonZeroI8>

#### pub const fn checked_abs(self) -> Option<NonZeroI8>

Checked absolute value.
Check for overflow and returns `None`

if
`self == i8::MIN`

.
The result cannot be zero.

##### Example

```
#![feature(nonzero_ops)]
let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;
let min = NonZeroI8::new(i8::MIN)?;
assert_eq!(Some(pos), neg.checked_abs());
assert_eq!(None, min.checked_abs());
```

Runsource#### pub const fn overflowing_abs(self) -> (NonZeroI8, bool)

#### pub const fn overflowing_abs(self) -> (NonZeroI8, bool)

Computes the absolute value of self,
with overflow information, see
`i8::overflowing_abs`

.

##### Example

```
#![feature(nonzero_ops)]
let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;
let min = NonZeroI8::new(i8::MIN)?;
assert_eq!((pos, false), pos.overflowing_abs());
assert_eq!((pos, false), neg.overflowing_abs());
assert_eq!((min, true), min.overflowing_abs());
```

Runsource#### pub const fn saturating_abs(self) -> NonZeroI8

#### pub const fn saturating_abs(self) -> NonZeroI8

Saturating absolute value, see
`i8::saturating_abs`

.

##### Example

```
#![feature(nonzero_ops)]
let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;
let min = NonZeroI8::new(i8::MIN)?;
let min_plus = NonZeroI8::new(i8::MIN + 1)?;
let max = NonZeroI8::new(i8::MAX)?;
assert_eq!(pos, pos.saturating_abs());
assert_eq!(pos, neg.saturating_abs());
assert_eq!(max, min.saturating_abs());
assert_eq!(max, min_plus.saturating_abs());
```

Runsource#### pub const fn wrapping_abs(self) -> NonZeroI8

#### pub const fn wrapping_abs(self) -> NonZeroI8

Wrapping absolute value, see
`i8::wrapping_abs`

.

##### Example

```
#![feature(nonzero_ops)]
let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;
let min = NonZeroI8::new(i8::MIN)?;
let max = NonZeroI8::new(i8::MAX)?;
assert_eq!(pos, pos.wrapping_abs());
assert_eq!(pos, neg.wrapping_abs());
assert_eq!(min, min.wrapping_abs());
```

Runsource#### pub const fn unsigned_abs(self) -> NonZeroU8

#### pub const fn unsigned_abs(self) -> NonZeroU8

Computes the absolute value of self without any wrapping or panicking.

##### Example

```
#![feature(nonzero_ops)]
let u_pos = NonZeroU8::new(1)?;
let i_pos = NonZeroI8::new(1)?;
let i_neg = NonZeroI8::new(-1)?;
let i_min = NonZeroI8::new(i8::MIN)?;
let u_max = NonZeroU8::new(u8::MAX / 2 + 1)?;
assert_eq!(u_pos, i_pos.unsigned_abs());
assert_eq!(u_pos, i_neg.unsigned_abs());
assert_eq!(u_max, i_min.unsigned_abs());
```

Runsource### impl NonZeroI8

### impl NonZeroI8

source#### pub const fn checked_mul(self, other: NonZeroI8) -> Option<NonZeroI8>

#### pub const fn checked_mul(self, other: NonZeroI8) -> Option<NonZeroI8>

Multiply two non-zero integers together.
Check for overflow and return `None`

on overflow.
As a consequence, the result cannot wrap to zero.

##### Examples

```
#![feature(nonzero_ops)]
let two = NonZeroI8::new(2)?;
let four = NonZeroI8::new(4)?;
let max = NonZeroI8::new(i8::MAX)?;
assert_eq!(Some(four), two.checked_mul(two));
assert_eq!(None, max.checked_mul(two));
```

Runsource#### pub const fn saturating_mul(self, other: NonZeroI8) -> NonZeroI8

#### pub const fn saturating_mul(self, other: NonZeroI8) -> NonZeroI8

source#### pub const unsafe fn unchecked_mul(self, other: NonZeroI8) -> NonZeroI8

#### pub const unsafe fn unchecked_mul(self, other: NonZeroI8) -> NonZeroI8

Multiply two non-zero integers together,
assuming overflow cannot occur.
Overflow is unchecked, and it is undefined behaviour to overflow
*even if the result would wrap to a non-zero value*.
The behaviour is undefined as soon as
`self * rhs > i8::MAX`

, or `self * rhs < i8::MIN`

.

##### Examples

```
#![feature(nonzero_ops)]
let two = NonZeroI8::new(2)?;
let four = NonZeroI8::new(4)?;
assert_eq!(four, unsafe { two.unchecked_mul(two) });
```

Runsource#### pub const fn checked_pow(self, other: u32) -> Option<NonZeroI8>

#### pub const fn checked_pow(self, other: u32) -> Option<NonZeroI8>

Raise non-zero value to an integer power.
Check for overflow and return `None`

on overflow.
As a consequence, the result cannot wrap to zero.

##### Examples

```
#![feature(nonzero_ops)]
let three = NonZeroI8::new(3)?;
let twenty_seven = NonZeroI8::new(27)?;
let half_max = NonZeroI8::new(i8::MAX / 2)?;
assert_eq!(Some(twenty_seven), three.checked_pow(3));
assert_eq!(None, half_max.checked_pow(3));
```

Runsource#### pub const fn saturating_pow(self, other: u32) -> NonZeroI8

#### pub const fn saturating_pow(self, other: u32) -> NonZeroI8

Raise non-zero value to an integer power.
Return `i8::MIN`

or `i8::MAX`

on overflow.

##### Examples

```
#![feature(nonzero_ops)]
let three = NonZeroI8::new(3)?;
let twenty_seven = NonZeroI8::new(27)?;
let max = NonZeroI8::new(i8::MAX)?;
assert_eq!(twenty_seven, three.saturating_pow(3));
assert_eq!(max, max.saturating_pow(3));
```

Runsource### impl NonZeroI8

### impl NonZeroI8

source#### pub const MIN: NonZeroI8 = Self::new(i8::MIN).unwrap()

#### pub const MIN: NonZeroI8 = Self::new(i8::MIN).unwrap()

The smallest value that can be represented by this non-zero
integer type,
equal to `i8::MIN`

.

Note: While most integer types are defined for every whole
number between `MIN`

and `MAX`

, signed non-zero integers are
a special case. They have a “gap” at 0.

##### Examples

```
#![feature(nonzero_min_max)]
assert_eq!(NonZeroI8::MIN.get(), i8::MIN);
```

Runsource#### pub const MAX: NonZeroI8 = Self::new(i8::MAX).unwrap()

#### pub const MAX: NonZeroI8 = Self::new(i8::MAX).unwrap()

The largest value that can be represented by this non-zero
integer type,
equal to `i8::MAX`

.

Note: While most integer types are defined for every whole
number between `MIN`

and `MAX`

, signed non-zero integers are
a special case. They have a “gap” at 0.

##### Examples

```
#![feature(nonzero_min_max)]
assert_eq!(NonZeroI8::MAX.get(), i8::MAX);
```

Run## Trait Implementations

1.45.0 (const: unstable) · source### impl BitOrAssign<NonZeroI8> for NonZeroI8

### impl BitOrAssign<NonZeroI8> for NonZeroI8

const: unstable · source#### fn bitor_assign(&mut self, rhs: NonZeroI8)

#### fn bitor_assign(&mut self, rhs: NonZeroI8)

Performs the `|=`

operation. Read more

1.45.0 (const: unstable) · source### impl BitOrAssign<i8> for NonZeroI8

### impl BitOrAssign<i8> for NonZeroI8

const: unstable · source#### fn bitor_assign(&mut self, rhs: i8)

#### fn bitor_assign(&mut self, rhs: i8)

Performs the `|=`

operation. Read more

1.41.0 (const: unstable) · source### impl From<NonZeroI8> for NonZeroI128

### impl From<NonZeroI8> for NonZeroI128

const: unstable · source#### fn from(small: NonZeroI8) -> NonZeroI128

#### fn from(small: NonZeroI8) -> NonZeroI128

Converts `NonZeroI8`

to `NonZeroI128`

losslessly.

1.41.0 (const: unstable) · source### impl From<NonZeroI8> for NonZeroI16

### impl From<NonZeroI8> for NonZeroI16

const: unstable · source#### fn from(small: NonZeroI8) -> NonZeroI16

#### fn from(small: NonZeroI8) -> NonZeroI16

Converts `NonZeroI8`

to `NonZeroI16`

losslessly.

1.41.0 (const: unstable) · source### impl From<NonZeroI8> for NonZeroI64

### impl From<NonZeroI8> for NonZeroI64

const: unstable · source#### fn from(small: NonZeroI8) -> NonZeroI64

#### fn from(small: NonZeroI8) -> NonZeroI64

Converts `NonZeroI8`

to `NonZeroI64`

losslessly.

1.41.0 (const: unstable) · source### impl From<NonZeroI8> for NonZeroI32

### impl From<NonZeroI8> for NonZeroI32

const: unstable · source#### fn from(small: NonZeroI8) -> NonZeroI32

#### fn from(small: NonZeroI8) -> NonZeroI32

Converts `NonZeroI8`

to `NonZeroI32`

losslessly.

1.41.0 (const: unstable) · source### impl From<NonZeroI8> for NonZeroIsize

### impl From<NonZeroI8> for NonZeroIsize

const: unstable · source#### fn from(small: NonZeroI8) -> NonZeroIsize

#### fn from(small: NonZeroI8) -> NonZeroIsize

Converts `NonZeroI8`

to `NonZeroIsize`

losslessly.

source### impl Ord for NonZeroI8

### impl Ord for NonZeroI8

source### impl PartialOrd<NonZeroI8> for NonZeroI8

### impl PartialOrd<NonZeroI8> for NonZeroI8

source#### fn partial_cmp(&self, other: &NonZeroI8) -> Option<Ordering>

#### fn partial_cmp(&self, other: &NonZeroI8) -> Option<Ordering>

This method returns an ordering between `self`

and `other`

values if one exists. Read more

1.0.0 · source#### fn lt(&self, other: &Rhs) -> bool

#### fn lt(&self, other: &Rhs) -> bool

This method tests less than (for `self`

and `other`

) and is used by the `<`

operator. Read more

1.0.0 · source#### fn le(&self, other: &Rhs) -> bool

#### fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for `self`

and `other`

) and is used by the `<=`

operator. Read more

1.49.0 · source### impl TryFrom<NonZeroI128> for NonZeroI8

### impl TryFrom<NonZeroI128> for NonZeroI8

source#### fn try_from(

value: NonZeroI128

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI128>>::Error>

#### fn try_from(

value: NonZeroI128

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI128>>::Error>

Attempts to convert `NonZeroI128`

to `NonZeroI8`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroI16> for NonZeroI8

### impl TryFrom<NonZeroI16> for NonZeroI8

source#### fn try_from(

value: NonZeroI16

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI16>>::Error>

#### fn try_from(

value: NonZeroI16

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI16>>::Error>

Attempts to convert `NonZeroI16`

to `NonZeroI8`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroI32> for NonZeroI8

### impl TryFrom<NonZeroI32> for NonZeroI8

source#### fn try_from(

value: NonZeroI32

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI32>>::Error>

#### fn try_from(

value: NonZeroI32

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI32>>::Error>

Attempts to convert `NonZeroI32`

to `NonZeroI8`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroI64> for NonZeroI8

### impl TryFrom<NonZeroI64> for NonZeroI8

source#### fn try_from(

value: NonZeroI64

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI64>>::Error>

#### fn try_from(

value: NonZeroI64

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI64>>::Error>

Attempts to convert `NonZeroI64`

to `NonZeroI8`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroI8> for NonZeroU128

### impl TryFrom<NonZeroI8> for NonZeroU128

source#### fn try_from(

value: NonZeroI8

) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI8>>::Error>

#### fn try_from(

value: NonZeroI8

) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI8>>::Error>

Attempts to convert `NonZeroI8`

to `NonZeroU128`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroI8> for NonZeroU32

### impl TryFrom<NonZeroI8> for NonZeroU32

source#### fn try_from(

value: NonZeroI8

) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI8>>::Error>

#### fn try_from(

value: NonZeroI8

) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI8>>::Error>

Attempts to convert `NonZeroI8`

to `NonZeroU32`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroI8> for NonZeroUsize

### impl TryFrom<NonZeroI8> for NonZeroUsize

source#### fn try_from(

value: NonZeroI8

) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI8>>::Error>

#### fn try_from(

value: NonZeroI8

) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI8>>::Error>

Attempts to convert `NonZeroI8`

to `NonZeroUsize`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroI8> for NonZeroU16

### impl TryFrom<NonZeroI8> for NonZeroU16

source#### fn try_from(

value: NonZeroI8

) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI8>>::Error>

#### fn try_from(

value: NonZeroI8

) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI8>>::Error>

Attempts to convert `NonZeroI8`

to `NonZeroU16`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroI8> for NonZeroU64

### impl TryFrom<NonZeroI8> for NonZeroU64

source#### fn try_from(

value: NonZeroI8

) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI8>>::Error>

#### fn try_from(

value: NonZeroI8

) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI8>>::Error>

Attempts to convert `NonZeroI8`

to `NonZeroU64`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroIsize> for NonZeroI8

### impl TryFrom<NonZeroIsize> for NonZeroI8

source#### fn try_from(

value: NonZeroIsize

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroIsize>>::Error>

#### fn try_from(

value: NonZeroIsize

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroIsize>>::Error>

Attempts to convert `NonZeroIsize`

to `NonZeroI8`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroU128> for NonZeroI8

### impl TryFrom<NonZeroU128> for NonZeroI8

source#### fn try_from(

value: NonZeroU128

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU128>>::Error>

#### fn try_from(

value: NonZeroU128

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU128>>::Error>

Attempts to convert `NonZeroU128`

to `NonZeroI8`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroU16> for NonZeroI8

### impl TryFrom<NonZeroU16> for NonZeroI8

source#### fn try_from(

value: NonZeroU16

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU16>>::Error>

#### fn try_from(

value: NonZeroU16

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU16>>::Error>

Attempts to convert `NonZeroU16`

to `NonZeroI8`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroU32> for NonZeroI8

### impl TryFrom<NonZeroU32> for NonZeroI8

source#### fn try_from(

value: NonZeroU32

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU32>>::Error>

#### fn try_from(

value: NonZeroU32

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU32>>::Error>

Attempts to convert `NonZeroU32`

to `NonZeroI8`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroU64> for NonZeroI8

### impl TryFrom<NonZeroU64> for NonZeroI8

source#### fn try_from(

value: NonZeroU64

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU64>>::Error>

#### fn try_from(

value: NonZeroU64

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU64>>::Error>

Attempts to convert `NonZeroU64`

to `NonZeroI8`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source### impl TryFrom<NonZeroUsize> for NonZeroI8

### impl TryFrom<NonZeroUsize> for NonZeroI8

source#### fn try_from(

value: NonZeroUsize

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroUsize>>::Error>

#### fn try_from(

value: NonZeroUsize

) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroUsize>>::Error>

Attempts to convert `NonZeroUsize`

to `NonZeroI8`

.

#### type Error = TryFromIntError

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

### impl Copy for NonZeroI8

### impl Eq for NonZeroI8

### impl StructuralEq for NonZeroI8

### impl StructuralPartialEq for NonZeroI8

## Auto Trait Implementations

### impl RefUnwindSafe for NonZeroI8

### impl Send for NonZeroI8

### impl Sync for NonZeroI8

### impl Unpin for NonZeroI8

### impl UnwindSafe for NonZeroI8

## Blanket Implementations

source### impl<T> BorrowMut<T> for T where

T: ?Sized,

### impl<T> BorrowMut<T> for T where

T: ?Sized,

const: unstable · source#### fn borrow_mut(&mut self) -> &mut T

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

source### impl<T> ToOwned for T where

T: Clone,

### impl<T> ToOwned for T where

T: Clone,

#### type Owned = T

#### type Owned = T

The resulting type after obtaining ownership.

source#### fn clone_into(&self, target: &mut T)

#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more