# Struct core::num::NonZeroUsize 1.28.0[−][src]

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

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>());Run

## Methods

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`impl NonZeroUsize`

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

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Create a non-zero without checking the value.

# Safety

The value must not be zero.

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`pub fn new(n: usize) -> Option<Self>`

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

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`pub fn get(self) -> usize`

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Returns the value as a primitive type.

## Trait Implementations

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`impl Copy for NonZeroUsize`

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`impl Clone for NonZeroUsize`

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`fn clone(&self) -> NonZeroUsize`

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Returns a copy of the value. Read more

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

1.0.0
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Performs copy-assignment from `source`. Read more

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`impl Eq for NonZeroUsize`

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`impl PartialEq for NonZeroUsize`

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

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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: &NonZeroUsize) -> bool`

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This method tests for `!=`.

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`impl Ord for NonZeroUsize`

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

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

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

1.21.0
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Compares and returns the maximum of two values. Read more

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

1.21.0
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Compares and returns the minimum of two values. Read more

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`impl PartialOrd for NonZeroUsize`

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

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

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

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

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

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

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

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

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

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

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`impl Hash for NonZeroUsize`

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

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Feeds this value into the given [`Hasher`]. Read more

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

1.3.0
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Feeds a slice of this type into the given [`Hasher`]. Read more

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`impl Debug for NonZeroUsize`

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

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Formats the value using the given formatter. Read more

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`impl Display for NonZeroUsize`

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

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Formats the value using the given formatter. Read more

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`impl Binary for NonZeroUsize`

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

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Formats the value using the given formatter.

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`impl Octal for NonZeroUsize`

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

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Formats the value using the given formatter.

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`impl LowerHex for NonZeroUsize`

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

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Formats the value using the given formatter.

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`impl UpperHex for NonZeroUsize`

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

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Formats the value using the given formatter.

## Auto Trait Implementations

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`impl Send for NonZeroUsize`

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`impl Sync for NonZeroUsize`

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