# Struct std::num::NonZeroI8 1.34.0[−][src]

`#[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

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.

Creates a non-zero if the given value is not zero.

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);
```

RunReturns 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);
```

RunChecked 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());
```

RunComputes 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());
```

RunSaturating 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());
```

RunWrapping 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());
```

RunComputes 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());
```

RunMultiply 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));
```

RunMultiply 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) });
```

RunRaise 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));
```

RunRaise 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));
```

Run## Trait Implementations

Performs the `|=`

operation. Read more

Performs the `|=`

operation. Read more

Converts `NonZeroI8`

to `NonZeroI32`

losslessly.

Converts `NonZeroI8`

to `NonZeroI64`

losslessly.

Converts `NonZeroI8`

to `NonZeroI16`

losslessly.

Converts `NonZeroI8`

to `NonZeroI128`

losslessly.

Converts `NonZeroI8`

to `NonZeroIsize`

losslessly.

This method returns an ordering between `self`

and `other`

values if one exists. Read more

This method tests less than (for `self`

and `other`

) and is used by the `<`

operator. Read more

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

and `other`

) and is used by the `<=`

operator. Read more

This method tests greater than (for `self`

and `other`

) and is used by the `>`

operator. Read more

#### pub fn try_from(

value: NonZeroI128

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

#### pub 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.

#### pub fn try_from(

value: NonZeroI16

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

#### pub 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.

#### pub fn try_from(

value: NonZeroI32

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

#### pub 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.

#### pub fn try_from(

value: NonZeroI64

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

#### pub 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.

#### pub fn try_from(

value: NonZeroI8

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

#### pub 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.

#### pub fn try_from(

value: NonZeroI8

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

#### pub 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.

#### pub fn try_from(

value: NonZeroI8

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

#### pub 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.

#### pub fn try_from(

value: NonZeroI8

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

#### pub 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.

#### pub fn try_from(

value: NonZeroI8

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

#### pub 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.

#### pub fn try_from(

value: NonZeroIsize

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

#### pub 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.

#### pub fn try_from(

value: NonZeroU128

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

#### pub 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.

#### pub fn try_from(

value: NonZeroU16

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

#### pub 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.

#### pub fn try_from(

value: NonZeroU32

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

#### pub 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.

#### pub fn try_from(

value: NonZeroU64

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

#### pub 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.

#### pub fn try_from(

value: NonZeroUsize

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

#### pub 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.

## Auto Trait Implementations

### impl RefUnwindSafe for NonZeroI8

### impl UnwindSafe for NonZeroI8

## Blanket Implementations

Mutably borrows from an owned value. Read more