# Struct core::num::NonZeroU64

1.28.0 · source · [−]

    #[repr(transparent)]pub struct NonZeroU64(_);

Expand description

An integer that is known not to equal zero.

This enables some memory layout optimization. For example, `Option<NonZeroU64>` is the same size as `u64`:

    use std::mem::size_of;
    assert_eq!(size_of::<Option<core::num::NonZeroU64>>(), size_of::<u64>());

Run

## Implementations

source

### impl NonZeroU64

const: 1.28.0 · source

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

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: u64) -> Option<Self>

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

const: 1.34.0 · source

#### pub const fn get(self) -> u64

Returns the value as a primitive type.

source

### impl NonZeroU64

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::NonZeroU64::new(u64::MAX).unwrap();

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

Run
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::NonZeroU64::new(0b0101000).unwrap();

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

Run
source

### impl NonZeroU64

source

#### pub const fn checked_add(self, other: u64) -> Option<NonZeroU64>

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

Add an unsigned integer to a non-zero value. Check for overflow and return `None` on overflow As a consequence, the result cannot wrap to zero.

##### Examples

    #![feature(nonzero_ops)]

    let one = NonZeroU64::new(1)?;
    let two = NonZeroU64::new(2)?;
    let max = NonZeroU64::new(u64::MAX)?;

    assert_eq!(Some(two), one.checked_add(1));
    assert_eq!(None, max.checked_add(1));

Run
source

#### pub const fn saturating_add(self, other: u64) -> NonZeroU64

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

Add an unsigned integer to a non-zero value. Return `u64::MAX` on overflow.

##### Examples

    #![feature(nonzero_ops)]

    let one = NonZeroU64::new(1)?;
    let two = NonZeroU64::new(2)?;
    let max = NonZeroU64::new(u64::MAX)?;

    assert_eq!(two, one.saturating_add(1));
    assert_eq!(max, max.saturating_add(1));

Run
source

#### pub const unsafe fn unchecked_add(self, other: u64) -> NonZeroU64

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

Add an unsigned integer to a non-zero value, 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 > u64::MAX`.

##### Examples

    #![feature(nonzero_ops)]

    let one = NonZeroU64::new(1)?;
    let two = NonZeroU64::new(2)?;

    assert_eq!(two, unsafe { one.unchecked_add(1) });

Run
source

#### pub const fn checked_next_power_of_two(self) -> Option<NonZeroU64>

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

Returns the smallest power of two greater than or equal to n. Check for overflow and return `None` if the next power of two is greater than the type’s maximum value. As a consequence, the result cannot wrap to zero.

##### Examples

    #![feature(nonzero_ops)]

    let two = NonZeroU64::new(2)?;
    let three = NonZeroU64::new(3)?;
    let four = NonZeroU64::new(4)?;
    let max = NonZeroU64::new(u64::MAX)?;

    assert_eq!(Some(two), two.checked_next_power_of_two() );
    assert_eq!(Some(four), three.checked_next_power_of_two() );
    assert_eq!(None, max.checked_next_power_of_two() );

Run
source

#### pub const fn log2(self) -> u32

🔬 This is a nightly-only experimental API. (`int_log` #70887)

Returns the base 2 logarithm of the number, rounded down.

This is the same operation as `u64::log2`, except that it has no failure cases to worry about since this value can never be zero.

##### Examples

    #![feature(int_log)]

    assert_eq!(NonZeroU64::new(7).unwrap().log2(), 2);
    assert_eq!(NonZeroU64::new(8).unwrap().log2(), 3);
    assert_eq!(NonZeroU64::new(9).unwrap().log2(), 3);

Run
source

#### pub const fn log10(self) -> u32

🔬 This is a nightly-only experimental API. (`int_log` #70887)

Returns the base 10 logarithm of the number, rounded down.

This is the same operation as `u64::log10`, except that it has no failure cases to worry about since this value can never be zero.

##### Examples

    #![feature(int_log)]

    assert_eq!(NonZeroU64::new(99).unwrap().log10(), 1);
    assert_eq!(NonZeroU64::new(100).unwrap().log10(), 2);
    assert_eq!(NonZeroU64::new(101).unwrap().log10(), 2);

Run
source

### impl NonZeroU64

source

#### pub const fn checked_mul(self, other: NonZeroU64) -> Option<NonZeroU64>

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

Multiply two non-zero integers together. Check for overflow and return `None` on overflow. As a consequence, the result cannot wrap to zero.

##### Examples

    #![feature(nonzero_ops)]

    let two = NonZeroU64::new(2)?;
    let four = NonZeroU64::new(4)?;
    let max = NonZeroU64::new(u64::MAX)?;

    assert_eq!(Some(four), two.checked_mul(two));
    assert_eq!(None, max.checked_mul(two));

Run
source

#### pub const fn saturating_mul(self, other: NonZeroU64) -> NonZeroU64

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

Multiply two non-zero integers together. Return `u64::MAX` on overflow.

##### Examples

    #![feature(nonzero_ops)]

    let two = NonZeroU64::new(2)?;
    let four = NonZeroU64::new(4)?;
    let max = NonZeroU64::new(u64::MAX)?;

    assert_eq!(four, two.saturating_mul(two));
    assert_eq!(max, four.saturating_mul(max));

Run
source

#### pub const unsafe fn unchecked_mul(self, other: NonZeroU64) -> NonZeroU64

🔬 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 > u64::MAX`.

##### Examples

    #![feature(nonzero_ops)]

    let two = NonZeroU64::new(2)?;
    let four = NonZeroU64::new(4)?;

    assert_eq!(four, unsafe { two.unchecked_mul(two) });

Run
source

#### pub const fn checked_pow(self, other: u32) -> Option<NonZeroU64>

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

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

    #![feature(nonzero_ops)]

    let three = NonZeroU64::new(3)?;
    let twenty_seven = NonZeroU64::new(27)?;
    let half_max = NonZeroU64::new(u64::MAX / 2)?;

    assert_eq!(Some(twenty_seven), three.checked_pow(3));
    assert_eq!(None, half_max.checked_pow(3));

Run
source

#### pub const fn saturating_pow(self, other: u32) -> NonZeroU64

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

Raise non-zero value to an integer power. Return `u64::MAX` on overflow.

##### Examples

    #![feature(nonzero_ops)]

    let three = NonZeroU64::new(3)?;
    let twenty_seven = NonZeroU64::new(27)?;
    let max = NonZeroU64::new(u64::MAX)?;

    assert_eq!(twenty_seven, three.saturating_pow(3));
    assert_eq!(max, max.saturating_pow(3));

Run
source

### impl NonZeroU64

1.59.0 (const: 1.59.0) · source

#### pub const fn is_power_of_two(self) -> bool

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:

    let eight = std::num::NonZeroU64::new(8).unwrap();
    assert!(eight.is_power_of_two());
    let ten = std::num::NonZeroU64::new(10).unwrap();
    assert!(!ten.is_power_of_two());

Run
source

### impl NonZeroU64

source

#### pub const MIN: Self

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

The smallest value that can be represented by this non-zero integer type, 1.

##### Examples

    #![feature(nonzero_min_max)]

    assert_eq!(NonZeroU64::MIN.get(), 1u64);

Run
source

#### pub const MAX: Self

🔬 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 `u64::MAX`.

##### Examples

    #![feature(nonzero_min_max)]

    assert_eq!(NonZeroU64::MAX.get(), u64::MAX);

Run
source

### impl NonZeroU64

source

#### pub const BITS: u32

🔬 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 `u64::BITS`.

##### Examples

    #![feature(nonzero_bits)]

    assert_eq!(NonZeroU64::BITS, u64::BITS);

Run

## Trait Implementations

source

### impl Binary for NonZeroU64

source

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

Formats the value using the given formatter.

1.45.0 (const: unstable) · source

### impl BitOr<NonZeroU64> for NonZeroU64

#### type Output = Self

The resulting type after applying the `|` operator.

const: unstable · source

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

Performs the `|` operation. Read more

1.45.0 (const: unstable) · source

### impl BitOr<NonZeroU64> for u64

#### type Output = NonZeroU64

The resulting type after applying the `|` operator.

const: unstable · source

#### fn bitor(self, rhs: NonZeroU64) -> Self::Output

Performs the `|` operation. Read more

1.45.0 (const: unstable) · source

### impl BitOr<u64> for NonZeroU64

#### type Output = Self

The resulting type after applying the `|` operator.

const: unstable · source

#### fn bitor(self, rhs: u64) -> Self::Output

Performs the `|` operation. Read more

1.45.0 (const: unstable) · source

### impl BitOrAssign<NonZeroU64> for NonZeroU64

const: unstable · source

#### fn bitor_assign(&mut self, rhs: Self)

Performs the `|=` operation. Read more

1.45.0 (const: unstable) · source

### impl BitOrAssign<u64> for NonZeroU64

const: unstable · source

#### fn bitor_assign(&mut self, rhs: u64)

Performs the `|=` operation. Read more

source

### impl Clone for NonZeroU64

source

#### fn clone(&self) -> NonZeroU64

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

source

### impl Debug for NonZeroU64

source

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

Formats the value using the given formatter. Read more

source

### impl Display for NonZeroU64

source

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

Formats the value using the given formatter. Read more

1.51.0 (const: unstable) · source

### impl Div<NonZeroU64> for u64

const: unstable · source

#### fn div(self, other: NonZeroU64) -> u64

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

#### type Output = u64

The resulting type after applying the `/` operator.

1.41.0 (const: unstable) · source

### impl From<NonZeroU16> for NonZeroU64

const: unstable · source

#### fn from(small: NonZeroU16) -> Self

Converts `NonZeroU16` to `NonZeroU64` losslessly.

1.41.0 (const: unstable) · source

### impl From<NonZeroU32> for NonZeroU64

const: unstable · source

#### fn from(small: NonZeroU32) -> Self

Converts `NonZeroU32` to `NonZeroU64` losslessly.

1.31.0 (const: unstable) · source

### impl From<NonZeroU64> for u64

const: unstable · source

#### fn from(nonzero: NonZeroU64) -> Self

Converts a `NonZeroU64` into an `u64`

1.41.0 (const: unstable) · source

### impl From<NonZeroU64> for NonZeroU128

const: unstable · source

#### fn from(small: NonZeroU64) -> Self

Converts `NonZeroU64` to `NonZeroU128` losslessly.

1.41.0 (const: unstable) · source

### impl From<NonZeroU64> for NonZeroI128

const: unstable · source

#### fn from(small: NonZeroU64) -> Self

Converts `NonZeroU64` to `NonZeroI128` losslessly.

1.41.0 (const: unstable) · source

### impl From<NonZeroU8> for NonZeroU64

const: unstable · source

#### fn from(small: NonZeroU8) -> Self

Converts `NonZeroU8` to `NonZeroU64` losslessly.

1.35.0 · source

### impl FromStr for NonZeroU64

#### type Err = ParseIntError

The associated error which can be returned from parsing.

source

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

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

source

### impl Hash for NonZeroU64

source

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

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

1.3.0 · source

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

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

source

### impl LowerHex for NonZeroU64

source

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

Formats the value using the given formatter.

source

### impl Octal for NonZeroU64

source

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

Formats the value using the given formatter.

source

### impl Ord for NonZeroU64

source

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

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

1.21.0 · source

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

Compares and returns the maximum of two values. Read more

1.21.0 · source

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

Compares and returns the minimum of two values. Read more

1.50.0 · source

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

Restrict a value to a certain interval. Read more

source

### impl PartialEq<NonZeroU64> for NonZeroU64

source

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

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

source

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

This method tests for `!=`.

source

### impl PartialOrd<NonZeroU64> for NonZeroU64

source

#### fn partial_cmp(&self, other: &NonZeroU64) -> 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

1.51.0 (const: unstable) · source

### impl Rem<NonZeroU64> for u64

const: unstable · source

#### fn rem(self, other: NonZeroU64) -> u64

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

#### type Output = u64

The resulting type after applying the `%` operator.

1.49.0 · source

### impl TryFrom<NonZeroI128> for NonZeroU64

source

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

Attempts to convert `NonZeroI128` to `NonZeroU64`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

### impl TryFrom<NonZeroI16> for NonZeroU64

source

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

Attempts to convert `NonZeroI16` to `NonZeroU64`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

### impl TryFrom<NonZeroI32> for NonZeroU64

source

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

Attempts to convert `NonZeroI32` to `NonZeroU64`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

### impl TryFrom<NonZeroI64> for NonZeroU64

source

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

Attempts to convert `NonZeroI64` to `NonZeroU64`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

### impl TryFrom<NonZeroI8> for NonZeroU64

source

#### fn try_from(value: NonZeroI8) -> Result<Self, Self::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<NonZeroIsize> for NonZeroU64

source

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

Attempts to convert `NonZeroIsize` to `NonZeroU64`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

### impl TryFrom<NonZeroU128> for NonZeroU64

source

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

Attempts to convert `NonZeroU128` to `NonZeroU64`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

### impl TryFrom<NonZeroU64> for NonZeroU8

source

#### 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.

1.49.0 · source

### impl TryFrom<NonZeroU64> for NonZeroU16

source

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

Attempts to convert `NonZeroU64` to `NonZeroU16`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

### impl TryFrom<NonZeroU64> for NonZeroU32

source

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

Attempts to convert `NonZeroU64` to `NonZeroU32`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

### impl TryFrom<NonZeroU64> for NonZeroUsize

source

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

Attempts to convert `NonZeroU64` to `NonZeroUsize`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

### impl TryFrom<NonZeroU64> for NonZeroI8

source

#### fn try_from(value: NonZeroU64) -> Result<Self, Self::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<NonZeroU64> for NonZeroI16

source

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

Attempts to convert `NonZeroU64` to `NonZeroI16`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

### impl TryFrom<NonZeroU64> for NonZeroI32

source

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

Attempts to convert `NonZeroU64` to `NonZeroI32`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

### impl TryFrom<NonZeroU64> for NonZeroI64

source

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

Attempts to convert `NonZeroU64` to `NonZeroI64`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

### impl TryFrom<NonZeroU64> for NonZeroIsize

source

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

Attempts to convert `NonZeroU64` to `NonZeroIsize`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.49.0 · source

### impl TryFrom<NonZeroUsize> for NonZeroU64

source

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

Attempts to convert `NonZeroUsize` to `NonZeroU64`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

1.46.0 · source

### impl TryFrom<u64> for NonZeroU64

source

#### fn try_from(value: u64) -> Result<Self, Self::Error>

Attempts to convert `u64` to `NonZeroU64`.

#### type Error = TryFromIntError

The type returned in the event of a conversion error.

source

### impl UpperHex for NonZeroU64

source

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

Formats the value using the given formatter.

source

### impl Copy for NonZeroU64

source

### impl Eq for NonZeroU64

source

### impl StructuralEq for NonZeroU64

source

### impl StructuralPartialEq for NonZeroU64

## Auto Trait Implementations

### impl RefUnwindSafe for NonZeroU64

### impl Send for NonZeroU64

### impl Sync for NonZeroU64

### impl Unpin for NonZeroU64

### impl UnwindSafe for NonZeroU64

## Blanket Implementations

source

### impl<T> Any for T where
T: 'static + ?Sized,

source

#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more

source

### impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

source

### impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

source

### impl<T> From<T> for T

const: unstable · source

#### fn from(t: T) -> T

Returns the argument unchanged.

source

### impl<T, U> Into<U> for T where
U: From<T>,

const: unstable · source

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

source

### impl<T, U> TryFrom<U> for T where
U: Into<T>,

#### type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

source

### impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.