Struct std::num::NonZeroU64

[+] Show declaration

pub struct NonZeroU64(_);

[−] Expand description

An integer that is known not to equal zero.

This enables some memory layout optimization. For example, Option<NonZeroU32> is the same size as u32:

use std::mem::size_of;
assert_eq!(size_of::<Option<std::num::NonZeroU32>>(), size_of::<u32>());

Methods

impl NonZeroU64

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pub const unsafe fn new_unchecked(n: u64) -> NonZeroU64

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Create a non-zero without checking the value.

Safety

The value must not be zero.

pub fn new(n: u64) -> Option<NonZeroU64>

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

pub fn get(self) -> u64

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Returns the value as a primitive type.

Trait Implementations

impl Binary for NonZeroU64

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

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Formats the value using the given formatter.

impl Debug for NonZeroU64

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

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Formats the value using the given formatter.

impl Copy for NonZeroU64

impl UpperHex for NonZeroU64

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

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Formats the value using the given formatter.

impl Octal for NonZeroU64

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

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Formats the value using the given formatter.

impl Clone for NonZeroU64

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fn clone(&self) -> NonZeroU64

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Returns a copy of the value.

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

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Performs copy-assignment from source.

impl PartialOrd<NonZeroU64> for NonZeroU64

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fn partial_cmp(&self, other: &NonZeroU64) -> Option<Ordering>

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

fn lt(&self, other: &NonZeroU64) -> bool

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

fn le(&self, other: &NonZeroU64) -> bool

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

fn gt(&self, other: &NonZeroU64) -> bool

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

fn ge(&self, other: &NonZeroU64) -> bool

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

impl Ord for NonZeroU64

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fn cmp(&self, other: &NonZeroU64) -> Ordering

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This method returns an Ordering between self and other.

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

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Compares and returns the maximum of two values.

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

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Compares and returns the minimum of two values.

impl Eq for NonZeroU64

impl PartialEq<NonZeroU64> for NonZeroU64

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fn eq(&self, other: &NonZeroU64) -> bool

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

fn ne(&self, other: &NonZeroU64) -> bool

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This method tests for !=.

impl LowerHex for NonZeroU64

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

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Formats the value using the given formatter.

impl Display for NonZeroU64

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

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Formats the value using the given formatter.

impl Hash for NonZeroU64

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

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Feeds this value into the given [Hasher].

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

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Feeds a slice of this type into the given [Hasher].