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>());
RunImplementations
sourceimpl NonZeroU64
impl NonZeroU64
const: 1.28.0 · sourcepub const unsafe fn new_unchecked(n: u64) -> Self
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.
sourceimpl NonZeroU64
impl NonZeroU64
1.53.0 (const: 1.53.0) · sourcepub const fn leading_zeros(self) -> u32
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);
Run1.53.0 (const: 1.53.0) · sourcepub const fn trailing_zeros(self) -> u32
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);
Runsourceimpl NonZeroU64
impl NonZeroU64
1.64.0 (const: 1.64.0) · sourcepub const fn checked_add(self, other: u64) -> Option<NonZeroU64>
pub const fn checked_add(self, other: u64) -> Option<NonZeroU64>
Adds an unsigned integer to a non-zero value.
Checks for overflow and returns None
on overflow.
As a consequence, the result cannot wrap to zero.
Examples
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));
Run1.64.0 (const: 1.64.0) · sourcepub const fn saturating_add(self, other: u64) -> NonZeroU64
pub const fn saturating_add(self, other: u64) -> NonZeroU64
sourcepub const unsafe fn unchecked_add(self, other: u64) -> NonZeroU64
🔬This is a nightly-only experimental API. (nonzero_ops
#84186)
pub const unsafe fn unchecked_add(self, other: u64) -> NonZeroU64
nonzero_ops
#84186)Adds 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) });
Run1.64.0 (const: 1.64.0) · sourcepub const fn checked_next_power_of_two(self) -> Option<NonZeroU64>
pub const fn checked_next_power_of_two(self) -> Option<NonZeroU64>
Returns the smallest power of two greater than or equal to n.
Checks for overflow and returns 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
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() );
Runsourcepub const fn ilog2(self) -> u32
🔬This is a nightly-only experimental API. (int_log
#70887)
pub const fn ilog2(self) -> u32
int_log
#70887)Returns the base 2 logarithm of the number, rounded down.
This is the same operation as
u64::ilog2
,
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().ilog2(), 2);
assert_eq!(NonZeroU64::new(8).unwrap().ilog2(), 3);
assert_eq!(NonZeroU64::new(9).unwrap().ilog2(), 3);
Runsourcepub const fn ilog10(self) -> u32
🔬This is a nightly-only experimental API. (int_log
#70887)
pub const fn ilog10(self) -> u32
int_log
#70887)Returns the base 10 logarithm of the number, rounded down.
This is the same operation as
u64::ilog10
,
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().ilog10(), 1);
assert_eq!(NonZeroU64::new(100).unwrap().ilog10(), 2);
assert_eq!(NonZeroU64::new(101).unwrap().ilog10(), 2);
Runsourceimpl NonZeroU64
impl NonZeroU64
1.64.0 (const: 1.64.0) · sourcepub const fn checked_mul(self, other: NonZeroU64) -> Option<NonZeroU64>
pub const fn checked_mul(self, other: NonZeroU64) -> Option<NonZeroU64>
Multiplies two non-zero integers together.
Checks for overflow and returns None
on overflow.
As a consequence, the result cannot wrap to zero.
Examples
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));
Run1.64.0 (const: 1.64.0) · sourcepub const fn saturating_mul(self, other: NonZeroU64) -> NonZeroU64
pub const fn saturating_mul(self, other: NonZeroU64) -> NonZeroU64
sourcepub const unsafe fn unchecked_mul(self, other: NonZeroU64) -> NonZeroU64
🔬This is a nightly-only experimental API. (nonzero_ops
#84186)
pub const unsafe fn unchecked_mul(self, other: NonZeroU64) -> NonZeroU64
nonzero_ops
#84186)Multiplies 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) });
Run1.64.0 (const: 1.64.0) · sourcepub const fn checked_pow(self, other: u32) -> Option<NonZeroU64>
pub const fn checked_pow(self, other: u32) -> Option<NonZeroU64>
Raises non-zero value to an integer power.
Checks for overflow and returns None
on overflow.
As a consequence, the result cannot wrap to zero.
Examples
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));
Run1.64.0 (const: 1.64.0) · sourcepub const fn saturating_pow(self, other: u32) -> NonZeroU64
pub const fn saturating_pow(self, other: u32) -> NonZeroU64
sourceimpl NonZeroU64
impl NonZeroU64
1.59.0 (const: 1.59.0) · sourcepub const fn is_power_of_two(self) -> bool
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());
Runsourceimpl NonZeroU64
impl NonZeroU64
Trait Implementations
sourceimpl Binary for NonZeroU64
impl Binary for NonZeroU64
1.45.0 (const: unstable) · sourceimpl BitOr<NonZeroU64> for NonZeroU64
impl BitOr<NonZeroU64> for NonZeroU64
1.45.0 (const: unstable) · sourceimpl BitOr<NonZeroU64> for u64
impl BitOr<NonZeroU64> for u64
type Output = NonZeroU64
type Output = NonZeroU64
|
operator.1.45.0 (const: unstable) · sourceimpl BitOr<u64> for NonZeroU64
impl BitOr<u64> for NonZeroU64
1.45.0 (const: unstable) · sourceimpl BitOrAssign<NonZeroU64> for NonZeroU64
impl BitOrAssign<NonZeroU64> for NonZeroU64
const: unstable · sourcefn bitor_assign(&mut self, rhs: Self)
fn bitor_assign(&mut self, rhs: Self)
|=
operation. Read more1.45.0 (const: unstable) · sourceimpl BitOrAssign<u64> for NonZeroU64
impl BitOrAssign<u64> for NonZeroU64
const: unstable · sourcefn bitor_assign(&mut self, rhs: u64)
fn bitor_assign(&mut self, rhs: u64)
|=
operation. Read moresourceimpl Clone for NonZeroU64
impl Clone for NonZeroU64
sourcefn clone(&self) -> NonZeroU64
fn clone(&self) -> NonZeroU64
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresourceimpl Debug for NonZeroU64
impl Debug for NonZeroU64
sourceimpl Display for NonZeroU64
impl Display for NonZeroU64
1.51.0 (const: unstable) · sourceimpl Div<NonZeroU64> for u64
impl Div<NonZeroU64> for u64
1.41.0 (const: unstable) · sourceimpl From<NonZeroU16> for NonZeroU64
impl From<NonZeroU16> for NonZeroU64
const: unstable · sourcefn from(small: NonZeroU16) -> Self
fn from(small: NonZeroU16) -> Self
Converts NonZeroU16
to NonZeroU64
losslessly.
1.41.0 (const: unstable) · sourceimpl From<NonZeroU32> for NonZeroU64
impl From<NonZeroU32> for NonZeroU64
const: unstable · sourcefn from(small: NonZeroU32) -> Self
fn from(small: NonZeroU32) -> Self
Converts NonZeroU32
to NonZeroU64
losslessly.
1.41.0 (const: unstable) · sourceimpl From<NonZeroU64> for NonZeroI128
impl From<NonZeroU64> for NonZeroI128
const: unstable · sourcefn from(small: NonZeroU64) -> Self
fn from(small: NonZeroU64) -> Self
Converts NonZeroU64
to NonZeroI128
losslessly.
1.41.0 (const: unstable) · sourceimpl From<NonZeroU64> for NonZeroU128
impl From<NonZeroU64> for NonZeroU128
const: unstable · sourcefn from(small: NonZeroU64) -> Self
fn from(small: NonZeroU64) -> Self
Converts NonZeroU64
to NonZeroU128
losslessly.
1.31.0 (const: unstable) · sourceimpl From<NonZeroU64> for u64
impl From<NonZeroU64> for u64
const: unstable · sourcefn from(nonzero: NonZeroU64) -> Self
fn from(nonzero: NonZeroU64) -> Self
Converts a NonZeroU64
into an u64
1.41.0 (const: unstable) · sourceimpl From<NonZeroU8> for NonZeroU64
impl From<NonZeroU8> for NonZeroU64
1.35.0 · sourceimpl FromStr for NonZeroU64
impl FromStr for NonZeroU64
sourceimpl Hash for NonZeroU64
impl Hash for NonZeroU64
sourceimpl LowerHex for NonZeroU64
impl LowerHex for NonZeroU64
sourceimpl Octal for NonZeroU64
impl Octal for NonZeroU64
sourceimpl Ord for NonZeroU64
impl Ord for NonZeroU64
sourcefn cmp(&self, other: &NonZeroU64) -> Ordering
fn cmp(&self, other: &NonZeroU64) -> Ordering
1.21.0 · sourcefn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
1.21.0 · sourcefn min(self, other: Self) -> Selfwhere
Self: Sized,
fn min(self, other: Self) -> Selfwhere
Self: Sized,
1.50.0 · sourcefn clamp(self, min: Self, max: Self) -> Selfwhere
Self: Sized,
Self: PartialOrd,
fn clamp(self, min: Self, max: Self) -> Selfwhere
Self: Sized,
Self: PartialOrd,
sourceimpl PartialEq<NonZeroU64> for NonZeroU64
impl PartialEq<NonZeroU64> for NonZeroU64
sourcefn eq(&self, other: &NonZeroU64) -> bool
fn eq(&self, other: &NonZeroU64) -> bool
sourceimpl PartialOrd<NonZeroU64> for NonZeroU64
impl PartialOrd<NonZeroU64> for NonZeroU64
sourcefn partial_cmp(&self, other: &NonZeroU64) -> Option<Ordering>
fn partial_cmp(&self, other: &NonZeroU64) -> Option<Ordering>
1.0.0 · sourcefn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read more1.51.0 (const: unstable) · sourceimpl Rem<NonZeroU64> for u64
impl Rem<NonZeroU64> for u64
1.49.0 · sourceimpl TryFrom<NonZeroI128> for NonZeroU64
impl TryFrom<NonZeroI128> for NonZeroU64
sourcefn try_from(value: NonZeroI128) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI128) -> Result<Self, Self::Error>
Attempts to convert NonZeroI128
to NonZeroU64
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroI16> for NonZeroU64
impl TryFrom<NonZeroI16> for NonZeroU64
sourcefn try_from(value: NonZeroI16) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI16) -> Result<Self, Self::Error>
Attempts to convert NonZeroI16
to NonZeroU64
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroI32> for NonZeroU64
impl TryFrom<NonZeroI32> for NonZeroU64
sourcefn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
Attempts to convert NonZeroI32
to NonZeroU64
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroI64> for NonZeroU64
impl TryFrom<NonZeroI64> for NonZeroU64
sourcefn try_from(value: NonZeroI64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>
Attempts to convert NonZeroI64
to NonZeroU64
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroI8> for NonZeroU64
impl TryFrom<NonZeroI8> for NonZeroU64
1.49.0 · sourceimpl TryFrom<NonZeroIsize> for NonZeroU64
impl TryFrom<NonZeroIsize> for NonZeroU64
sourcefn try_from(value: NonZeroIsize) -> Result<Self, Self::Error>
fn try_from(value: NonZeroIsize) -> Result<Self, Self::Error>
Attempts to convert NonZeroIsize
to NonZeroU64
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroU128> for NonZeroU64
impl TryFrom<NonZeroU128> for NonZeroU64
sourcefn try_from(value: NonZeroU128) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU128) -> Result<Self, Self::Error>
Attempts to convert NonZeroU128
to NonZeroU64
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroU64> for NonZeroI16
impl TryFrom<NonZeroU64> for NonZeroI16
sourcefn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
Attempts to convert NonZeroU64
to NonZeroI16
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroU64> for NonZeroI32
impl TryFrom<NonZeroU64> for NonZeroI32
sourcefn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
Attempts to convert NonZeroU64
to NonZeroI32
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroU64> for NonZeroI64
impl TryFrom<NonZeroU64> for NonZeroI64
sourcefn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
Attempts to convert NonZeroU64
to NonZeroI64
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroU64> for NonZeroI8
impl TryFrom<NonZeroU64> for NonZeroI8
sourcefn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
Attempts to convert NonZeroU64
to NonZeroI8
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroU64> for NonZeroIsize
impl TryFrom<NonZeroU64> for NonZeroIsize
sourcefn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
Attempts to convert NonZeroU64
to NonZeroIsize
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroU64> for NonZeroU16
impl TryFrom<NonZeroU64> for NonZeroU16
sourcefn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
Attempts to convert NonZeroU64
to NonZeroU16
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroU64> for NonZeroU32
impl TryFrom<NonZeroU64> for NonZeroU32
sourcefn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
Attempts to convert NonZeroU64
to NonZeroU32
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroU64> for NonZeroU8
impl TryFrom<NonZeroU64> for NonZeroU8
sourcefn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
Attempts to convert NonZeroU64
to NonZeroU8
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroU64> for NonZeroUsize
impl TryFrom<NonZeroU64> for NonZeroUsize
sourcefn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
Attempts to convert NonZeroU64
to NonZeroUsize
.
type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · sourceimpl TryFrom<NonZeroUsize> for NonZeroU64
impl TryFrom<NonZeroUsize> for NonZeroU64
sourcefn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
Attempts to convert NonZeroUsize
to NonZeroU64
.