Struct core::num::NonZeroU8

#[repr(transparent)]
pub struct NonZeroU8(_);

An integer that is known not to equal zero.

This enables some memory layout optimization. For example, Option<NonZeroU8> is the same size as u8:

use std::mem::size_of;
assert_eq!(size_of::<Option<core::num::NonZeroU8>>(), size_of::<u8>());

Implementations

impl NonZeroU8

pub const unsafe fn new_unchecked(n: u8) -> Self

Creates a non-zero without checking the value.

Safety

The value must not be zero.

pub const fn new(n: u8) -> Option<Self>

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

pub const fn get(self) -> u8

Returns the value as a primitive type.

impl NonZeroU8

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::NonZeroU8::new(u8::MAX).unwrap();

assert_eq!(n.leading_zeros(), 0);

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::NonZeroU8::new(0b0101000).unwrap();

assert_eq!(n.trailing_zeros(), 3);

impl NonZeroU8

pub const fn is_power_of_two(self) -> bool

🔬 This is a nightly-only experimental API. (nonzero_is_power_of_two #81106)

Returns true if and only if self == (1 << k) for some k.

On many architectures, this function can perform better than is_power_of_two() on the underlying integer type, as special handling of zero can be avoided.

Examples

Basic usage:

#![feature(nonzero_is_power_of_two)]

let eight = std::num::NonZeroU8::new(8).unwrap();
assert!(eight.is_power_of_two());
let ten = std::num::NonZeroU8::new(10).unwrap();
assert!(!ten.is_power_of_two());

Trait Implementations

impl Binary for NonZeroU8

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

Formats the value using the given formatter.

impl BitOr<NonZeroU8> for NonZeroU8

type Output = Self

The resulting type after applying the | operator.

fn bitor(self, rhs: Self) -> Self::Output

Performs the | operation.

impl BitOr<NonZeroU8> for u8

type Output = NonZeroU8

The resulting type after applying the | operator.

fn bitor(self, rhs: NonZeroU8) -> Self::Output

Performs the | operation.

impl BitOr<u8> for NonZeroU8

type Output = Self

The resulting type after applying the | operator.

fn bitor(self, rhs: u8) -> Self::Output

Performs the | operation.

impl BitOrAssign<NonZeroU8> for NonZeroU8

fn bitor_assign(&mut self, rhs: Self)

Performs the |= operation.

impl BitOrAssign<u8> for NonZeroU8

fn bitor_assign(&mut self, rhs: u8)

Performs the |= operation.

impl Clone for NonZeroU8

fn clone(&self) -> NonZeroU8

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for NonZeroU8

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

Formats the value using the given formatter.

impl Display for NonZeroU8

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

Formats the value using the given formatter.

impl Div<NonZeroU8> for u8

fn div(self, other: NonZeroU8) -> u8

This operation rounds towards zero, truncating any fractional part of the exact result, and cannot panic.

type Output = u8

The resulting type after applying the / operator.

impl From<NonZeroU8> for u8

fn from(nonzero: NonZeroU8) -> Self

Converts a NonZeroU8 into an u8

impl From<NonZeroU8> for NonZeroU16

fn from(small: NonZeroU8) -> Self

Converts NonZeroU8 to NonZeroU16 losslessly.

impl From<NonZeroU8> for NonZeroIsize

fn from(small: NonZeroU8) -> Self

Converts NonZeroU8 to NonZeroIsize losslessly.

impl From<NonZeroU8> for NonZeroU32

fn from(small: NonZeroU8) -> Self

Converts NonZeroU8 to NonZeroU32 losslessly.

impl From<NonZeroU8> for NonZeroU64

fn from(small: NonZeroU8) -> Self

Converts NonZeroU8 to NonZeroU64 losslessly.

impl From<NonZeroU8> for NonZeroU128

fn from(small: NonZeroU8) -> Self

Converts NonZeroU8 to NonZeroU128 losslessly.

impl From<NonZeroU8> for NonZeroUsize

fn from(small: NonZeroU8) -> Self

Converts NonZeroU8 to NonZeroUsize losslessly.

impl From<NonZeroU8> for NonZeroI16

fn from(small: NonZeroU8) -> Self

Converts NonZeroU8 to NonZeroI16 losslessly.

impl From<NonZeroU8> for NonZeroI32

fn from(small: NonZeroU8) -> Self

Converts NonZeroU8 to NonZeroI32 losslessly.

impl From<NonZeroU8> for NonZeroI64

fn from(small: NonZeroU8) -> Self

Converts NonZeroU8 to NonZeroI64 losslessly.

impl From<NonZeroU8> for NonZeroI128

fn from(small: NonZeroU8) -> Self

Converts NonZeroU8 to NonZeroI128 losslessly.

impl FromStr for NonZeroU8

type Err = ParseIntError

The associated error which can be returned from parsing.

fn from_str(src: &str) -> Result<Self, Self::Err>

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

impl Hash for NonZeroU8

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

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

impl LowerHex for NonZeroU8

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

Formats the value using the given formatter.

impl Octal for NonZeroU8

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

Formats the value using the given formatter.

impl Ord for NonZeroU8

fn cmp(&self, other: &NonZeroU8) -> Ordering

This method returns an Ordering between self and other.

#[must_use]

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

Compares and returns the maximum of two values.

#[must_use]

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

Compares and returns the minimum of two values.

#[must_use]

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

Restrict a value to a certain interval.

impl PartialEq<NonZeroU8> for NonZeroU8

fn eq(&self, other: &NonZeroU8) -> bool

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

fn ne(&self, other: &NonZeroU8) -> bool

This method tests for !=.

impl PartialOrd<NonZeroU8> for NonZeroU8

fn partial_cmp(&self, other: &NonZeroU8) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

#[must_use]

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

This method tests less than (for self and other) and is used by the < operator.

#[must_use]

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

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

#[must_use]

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

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

#[must_use]

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Rem<NonZeroU8> for u8

fn rem(self, other: NonZeroU8) -> u8

This operation satisfies n % d == n - (n / d) * d, and cannot panic.

type Output = u8

The resulting type after applying the % operator.

impl TryFrom<NonZeroI128> for NonZeroU8

fn try_from(value: NonZeroI128) -> Result<Self, Self::Error>

Attempts to convert NonZeroI128 to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI16> for NonZeroU8

fn try_from(value: NonZeroI16) -> Result<Self, Self::Error>

Attempts to convert NonZeroI16 to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI32> for NonZeroU8

fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>

Attempts to convert NonZeroI32 to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI64> for NonZeroU8

fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>

Attempts to convert NonZeroI64 to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI8> for NonZeroU8

fn try_from(value: NonZeroI8) -> Result<Self, Self::Error>

Attempts to convert NonZeroI8 to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroIsize> for NonZeroU8

fn try_from(value: NonZeroIsize) -> Result<Self, Self::Error>

Attempts to convert NonZeroIsize to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroU128> for NonZeroU8

fn try_from(value: NonZeroU128) -> Result<Self, Self::Error>

Attempts to convert NonZeroU128 to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroU16> for NonZeroU8

fn try_from(value: NonZeroU16) -> Result<Self, Self::Error>

Attempts to convert NonZeroU16 to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroU32> for NonZeroU8

fn try_from(value: NonZeroU32) -> Result<Self, Self::Error>

Attempts to convert NonZeroU32 to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroU64> for NonZeroU8

fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>

Attempts to convert NonZeroU64 to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroU8> for NonZeroI8

fn try_from(value: NonZeroU8) -> Result<Self, Self::Error>

Attempts to convert NonZeroU8 to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroUsize> for NonZeroU8

fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>

Attempts to convert NonZeroUsize to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<u8> for NonZeroU8

fn try_from(value: u8) -> Result<Self, Self::Error>

Attempts to convert u8 to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl UpperHex for NonZeroU8

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

Formats the value using the given formatter.

impl Copy for NonZeroU8

impl Eq for NonZeroU8

impl StructuralEq for NonZeroU8

impl StructuralPartialEq for NonZeroU8