Struct core::num::NonZeroUsize

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

[−] Expand description

An integer that is known not to equal zero.

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

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

Methods

impl NonZeroUsize[−]

pub const unsafe fn new_unchecked(n: usize) -> Self[−]

Creates a non-zero without checking the value.

Safety

The value must not be zero.

pub fn new(n: usize) -> Option<Self>[−]

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

pub const fn get(self) -> usize[−]

Returns the value as a primitive type.

Trait Implementations

impl Copy for NonZeroUsize

impl PartialEq<NonZeroUsize> for NonZeroUsize[+]

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fn eq(&self, other: &NonZeroUsize) -> bool[−]

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

fn ne(&self, other: &NonZeroUsize) -> bool[−]

This method tests for !=.

impl Eq for NonZeroUsize

impl Ord for NonZeroUsize[+]

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fn cmp(&self, other: &NonZeroUsize) -> Ordering[−]

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

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

🔬 This is a nightly-only experimental API. (clamp #44095)

Restrict a value to a certain interval.

impl PartialOrd<NonZeroUsize> for NonZeroUsize[+]

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fn partial_cmp(&self, other: &NonZeroUsize) -> Option<Ordering>[−]

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

fn lt(&self, other: &NonZeroUsize) -> bool[−]

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

fn le(&self, other: &NonZeroUsize) -> bool[−]

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

fn gt(&self, other: &NonZeroUsize) -> bool[−]

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

fn ge(&self, other: &NonZeroUsize) -> bool[−]

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

impl Clone for NonZeroUsize[+]

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fn clone(&self) -> NonZeroUsize[−]

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)[−]

Performs copy-assignment from source.

impl From<NonZeroUsize> for usize[+]

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fn from(nonzero: NonZeroUsize) -> Self[−]

Performs the conversion.

impl FromStr for NonZeroUsize[+]

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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 NonZeroUsize[+]

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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 Debug for NonZeroUsize[+]

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fn fmt(&self, f: &mut Formatter) -> Result[−]

Formats the value using the given formatter.

impl Display for NonZeroUsize[+]

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fn fmt(&self, f: &mut Formatter) -> Result[−]

Formats the value using the given formatter.

impl Octal for NonZeroUsize[+]

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fn fmt(&self, f: &mut Formatter) -> Result[−]

Formats the value using the given formatter.

impl Binary for NonZeroUsize[+]

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fn fmt(&self, f: &mut Formatter) -> Result[−]

Formats the value using the given formatter.

impl LowerHex for NonZeroUsize[+]

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fn fmt(&self, f: &mut Formatter) -> Result[−]

Formats the value using the given formatter.

impl UpperHex for NonZeroUsize[+]

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fn fmt(&self, f: &mut Formatter) -> Result[−]

Formats the value using the given formatter.