Struct std::num::NonZeroI8

1.34.0 · source ·

#[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>());

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Implementations

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impl NonZeroI8

const: 1.34.0 · source

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.

const: 1.47.0 · source

pub const fn new(n: i8) -> Option<NonZeroI8>

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

const: 1.34.0 · source

pub const fn get(self) -> i8

Returns the value as a primitive type.

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impl NonZeroI8

1.53.0 (const: 1.53.0) · source

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);

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1.53.0 (const: 1.53.0) · source

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);

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impl NonZeroI8

1.64.0 (const: 1.64.0) · source

pub const fn abs(self) -> NonZeroI8

Computes the absolute value of self. See i8::abs for documentation on overflow behaviour.

Example

let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;
assert_eq!(pos, pos.abs());
assert_eq!(pos, neg.abs());

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1.64.0 (const: 1.64.0) · source

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

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());

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1.64.0 (const: 1.64.0) · source

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

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

Example

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());

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1.64.0 (const: 1.64.0) · source

pub const fn saturating_abs(self) -> NonZeroI8

Saturating absolute value, see i8::saturating_abs.

Example

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());

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1.64.0 (const: 1.64.0) · source

pub const fn wrapping_abs(self) -> NonZeroI8

Wrapping absolute value, see i8::wrapping_abs.

Example

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());

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1.64.0 (const: 1.64.0) · source

pub const fn unsigned_abs(self) -> NonZeroU8

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

Example

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());

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impl NonZeroI8

1.64.0 (const: 1.64.0) · source

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

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));

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1.64.0 (const: 1.64.0) · source

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

Multiply two non-zero integers together. Return i8::MAX on overflow.

Examples

let two = NonZeroI8::new(2)?;
let four = NonZeroI8::new(4)?;
let max = NonZeroI8::new(i8::MAX)?;
assert_eq!(four, two.saturating_mul(two));
assert_eq!(max, four.saturating_mul(max));

Run

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

🔬 This is a nightly-only experimental API. (nonzero_ops #84186)

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) });

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1.64.0 (const: 1.64.0) · source

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

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));

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1.64.0 (const: 1.64.0) · source

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

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));

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impl NonZeroI8

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

🔬 This is a nightly-only experimental API. (nonzero_min_max #89065)

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);

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

🔬 This is a nightly-only experimental API. (nonzero_min_max #89065)

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);

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impl NonZeroI8

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pub const BITS: u32 = 8u32

🔬 This is a nightly-only experimental API. (nonzero_bits #94881)

The size of this non-zero integer type in bits.

This value is equal to i8::BITS.

Examples

#![feature(nonzero_bits)]
assert_eq!(NonZeroI8::BITS, i8::BITS);

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Trait Implementations

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impl Binary for NonZeroI8

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

1.45.0 (const: unstable) · source

impl BitOr<NonZeroI8> for NonZeroI8

type Output = NonZeroI8

The resulting type after applying the | operator.

const: unstable · source

fn bitor(self, rhs: NonZeroI8) -> <NonZeroI8 as BitOr<NonZeroI8>>::Output

Performs the | operation. Read more

1.45.0 (const: unstable) · source

impl BitOr<NonZeroI8> for i8

type Output = NonZeroI8

The resulting type after applying the | operator.

const: unstable · source

fn bitor(self, rhs: NonZeroI8) -> <i8 as BitOr<NonZeroI8>>::Output

Performs the | operation. Read more

1.45.0 (const: unstable) · source

impl BitOr<i8> for NonZeroI8

type Output = NonZeroI8

The resulting type after applying the | operator.

const: unstable · source

fn bitor(self, rhs: i8) -> <NonZeroI8 as BitOr<i8>>::Output

Performs the | operation. Read more

1.45.0 (const: unstable) · source

impl BitOrAssign<NonZeroI8> for NonZeroI8

const: unstable · source

fn bitor_assign(&mut self, rhs: NonZeroI8)

Performs the |= operation. Read more

1.45.0 (const: unstable) · source

impl BitOrAssign<i8> for NonZeroI8

const: unstable · source

fn bitor_assign(&mut self, rhs: i8)

Performs the |= operation. Read more

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impl Clone for NonZeroI8

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fn clone(&self) -> NonZeroI8

Returns a copy of the value. Read more

1.0.0 · source

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl Debug for NonZeroI8

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more

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impl Display for NonZeroI8

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more

1.41.0 (const: unstable) · source

impl From<NonZeroI8> for NonZeroI128

const: unstable · source

fn from(small: NonZeroI8) -> NonZeroI128

Converts NonZeroI8 to NonZeroI128 losslessly.

1.41.0 (const: unstable) · source

impl From<NonZeroI8> for NonZeroI16

const: unstable · source

fn from(small: NonZeroI8) -> NonZeroI16

Converts NonZeroI8 to NonZeroI16 losslessly.

1.41.0 (const: unstable) · source

impl From<NonZeroI8> for NonZeroI32

const: unstable · source

fn from(small: NonZeroI8) -> NonZeroI32

Converts NonZeroI8 to NonZeroI32 losslessly.

1.41.0 (const: unstable) · source

impl From<NonZeroI8> for NonZeroI64

const: unstable · source

fn from(small: NonZeroI8) -> NonZeroI64

Converts NonZeroI8 to NonZeroI64 losslessly.

1.41.0 (const: unstable) · source

impl From<NonZeroI8> for NonZeroIsize

const: unstable · source

fn from(small: NonZeroI8) -> NonZeroIsize

Converts NonZeroI8 to NonZeroIsize losslessly.

1.31.0 (const: unstable) · source

impl From<NonZeroI8> for i8

const: unstable · source

fn from(nonzero: NonZeroI8) -> i8

Converts a NonZeroI8 into an i8

1.35.0 · source

impl FromStr for NonZeroI8

type Err = ParseIntError

The associated error which can be returned from parsing.

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fn from_str(src: &str) -> Result<NonZeroI8, <NonZeroI8 as FromStr>::Err>

Parses a string s to return a value of this type. Read more

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impl Hash for NonZeroI8

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fn hash<__H>(&self, state: &mut __H) where
__H: Hasher,

Feeds this value into the given Hasher. Read more

1.3.0 · source

fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,

Feeds a slice of this type into the given Hasher. Read more

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impl LowerHex for NonZeroI8

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

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impl Octal for NonZeroI8

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

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impl Ord for NonZeroI8

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fn cmp(&self, other: &NonZeroI8) -> Ordering

This method returns an Ordering between self and other. Read more

1.21.0 · source

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values. Read more

1.21.0 · source

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values. Read more

1.50.0 · source

fn clamp(self, min: Self, max: Self) -> Self where
Self: PartialOrd<Self>,

Restrict a value to a certain interval. Read more

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impl PartialEq<NonZeroI8> for NonZeroI8

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fn eq(&self, other: &NonZeroI8) -> bool

This method tests for self and other values to be equal, and is used by ==. Read more

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fn ne(&self, other: &NonZeroI8) -> bool

This method tests for !=.

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impl PartialOrd<NonZeroI8> for NonZeroI8

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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

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

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

1.0.0 · source

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

This method tests greater than (for self and other) and is used by the > operator. Read more

1.0.0 · source

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

This method tests greater 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

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fn try_from(
value: NonZeroI128
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI128>>::Error>

Attempts to convert NonZeroI128 to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroI16> for NonZeroI8

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fn try_from(
value: NonZeroI16
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI16>>::Error>

Attempts to convert NonZeroI16 to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroI32> for NonZeroI8

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fn try_from(
value: NonZeroI32
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI32>>::Error>

Attempts to convert NonZeroI32 to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroI64> for NonZeroI8

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fn try_from(
value: NonZeroI64
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI64>>::Error>

Attempts to convert NonZeroI64 to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroI8> for NonZeroU128

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fn try_from(
value: NonZeroI8
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI8>>::Error>

Attempts to convert NonZeroI8 to NonZeroU128.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroI8> for NonZeroU16

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fn try_from(
value: NonZeroI8
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI8>>::Error>

Attempts to convert NonZeroI8 to NonZeroU16.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroI8> for NonZeroU32

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fn try_from(
value: NonZeroI8
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI8>>::Error>

Attempts to convert NonZeroI8 to NonZeroU32.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroI8> for NonZeroU64

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fn try_from(
value: NonZeroI8
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI8>>::Error>

Attempts to convert NonZeroI8 to NonZeroU64.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroI8> for NonZeroU8

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fn try_from(
value: NonZeroI8
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI8>>::Error>

Attempts to convert NonZeroI8 to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroI8> for NonZeroUsize

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fn try_from(
value: NonZeroI8
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI8>>::Error>

Attempts to convert NonZeroI8 to NonZeroUsize.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroIsize> for NonZeroI8

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fn try_from(
value: NonZeroIsize
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroIsize>>::Error>

Attempts to convert NonZeroIsize to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroU128> for NonZeroI8

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fn try_from(
value: NonZeroU128
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU128>>::Error>

Attempts to convert NonZeroU128 to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroU16> for NonZeroI8

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fn try_from(
value: NonZeroU16
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU16>>::Error>

Attempts to convert NonZeroU16 to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroU32> for NonZeroI8

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fn try_from(
value: NonZeroU32
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU32>>::Error>

Attempts to convert NonZeroU32 to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroU64> for NonZeroI8

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fn try_from(
value: NonZeroU64
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU64>>::Error>

Attempts to convert NonZeroU64 to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroU8> for NonZeroI8

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fn try_from(
value: NonZeroU8
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU8>>::Error>

Attempts to convert NonZeroU8 to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

impl TryFrom<NonZeroUsize> for NonZeroI8

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fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroUsize>>::Error>

Attempts to convert NonZeroUsize to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

1.46.0 · source

impl TryFrom<i8> for NonZeroI8

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fn try_from(value: i8) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<i8>>::Error>

Attempts to convert i8 to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

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impl UpperHex for NonZeroI8

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

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impl Copy for NonZeroI8

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impl Eq for NonZeroI8

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impl StructuralEq for NonZeroI8

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impl StructuralPartialEq for NonZeroI8