Type Alias core::num::NonZeroU64
1.28.0 · source · pub type NonZeroU64 = NonZero<u64>;
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§Layout
NonZeroU64
is guaranteed to have the same layout and bit validity as u64
with the exception that 0
is not a valid instance.
Option<NonZeroU64>
is guaranteed to be compatible with u64
,
including in FFI.
Thanks to the null pointer optimization,
NonZeroU64
and Option<NonZeroU64>
are guaranteed to have the same size and alignment:
use std::num::NonZeroU64;
assert_eq!(size_of::<NonZeroU64>(), size_of::<Option<NonZeroU64>>());
assert_eq!(align_of::<NonZeroU64>(), align_of::<Option<NonZeroU64>>());
RunAliased Type§
struct NonZeroU64(/* private fields */);
Implementations§
source§impl 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.
const: 1.47.0 · sourcepub const fn new(n: u64) -> Option<Self>
pub const fn new(n: u64) -> Option<Self>
Creates a non-zero if the given value is not zero.
sourcepub unsafe fn from_mut_unchecked(n: &mut u64) -> &mut Self
🔬This is a nightly-only experimental API. (nonzero_from_mut
#106290)
pub unsafe fn from_mut_unchecked(n: &mut u64) -> &mut Self
nonzero_from_mut
#106290)Converts a primitive mutable reference to a non-zero mutable reference
without checking whether the referenced value is non-zero.
This results in undefined behavior if *n
is zero.
§Safety
The referenced value must not be currently zero.
sourcepub fn from_mut(n: &mut u64) -> Option<&mut Self>
🔬This is a nightly-only experimental API. (nonzero_from_mut
#106290)
pub fn from_mut(n: &mut u64) -> Option<&mut Self>
nonzero_from_mut
#106290)Converts a primitive mutable reference to a non-zero mutable reference if the referenced integer is not zero.
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);
Runconst: unstable · sourcepub fn count_ones(self) -> NonZeroU32
🔬This is a nightly-only experimental API. (non_zero_count_ones
#120287)
pub fn count_ones(self) -> NonZeroU32
non_zero_count_ones
#120287)Returns the number of ones in the binary representation of self
.
§Examples
Basic usage:
#![feature(non_zero_count_ones)]
let one = num::NonZeroU32::new(1)?;
let three = num::NonZeroU32::new(3)?;
let a = NonZeroU64::new(0b100_0000)?;
let b = NonZeroU64::new(0b100_0011)?;
assert_eq!(a.count_ones(), one);
assert_eq!(b.count_ones(), three);
Run1.64.0 (const: 1.64.0) · sourcepub const fn checked_add(self, other: u64) -> Option<Self>
pub const fn checked_add(self, other: u64) -> Option<Self>
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) -> Self
pub const fn saturating_add(self, other: u64) -> Self
Adds an unsigned integer to a non-zero value.
Return NonZeroU64::MAX
on overflow.
§Examples
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));
Runsourcepub const unsafe fn unchecked_add(self, other: u64) -> Self
🔬This is a nightly-only experimental API. (nonzero_ops
#84186)
pub const unsafe fn unchecked_add(self, other: u64) -> Self
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<Self>
pub const fn checked_next_power_of_two(self) -> Option<Self>
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() );
Run1.67.0 (const: 1.67.0) · sourcepub const fn ilog2(self) -> u32
pub const fn ilog2(self) -> u32
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
assert_eq!(NonZeroU64::new(7).unwrap().ilog2(), 2);
assert_eq!(NonZeroU64::new(8).unwrap().ilog2(), 3);
assert_eq!(NonZeroU64::new(9).unwrap().ilog2(), 3);
Run1.67.0 (const: 1.67.0) · sourcepub const fn ilog10(self) -> u32
pub const fn ilog10(self) -> u32
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
assert_eq!(NonZeroU64::new(99).unwrap().ilog10(), 1);
assert_eq!(NonZeroU64::new(100).unwrap().ilog10(), 2);
assert_eq!(NonZeroU64::new(101).unwrap().ilog10(), 2);
Runconst: unstable · sourcepub fn midpoint(self, rhs: Self) -> Self
🔬This is a nightly-only experimental API. (num_midpoint
#110840)
pub fn midpoint(self, rhs: Self) -> Self
num_midpoint
#110840)Calculates the middle point of self
and rhs
.
midpoint(a, b)
is (a + b) >> 1
as if it were performed in a
sufficiently-large signed integral type. This implies that the result is
always rounded towards negative infinity and that no overflow will ever occur.
§Examples
#![feature(num_midpoint)]
let one = NonZeroU64::new(1)?;
let two = NonZeroU64::new(2)?;
let four = NonZeroU64::new(4)?;
assert_eq!(one.midpoint(four), two);
assert_eq!(four.midpoint(one), two);
Run1.59.0 (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());
Run1.64.0 (const: 1.64.0) · sourcepub const fn checked_mul(self, other: Self) -> Option<Self>
pub const fn checked_mul(self, other: Self) -> Option<Self>
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: Self) -> Self
pub const fn saturating_mul(self, other: Self) -> Self
Multiplies two non-zero integers together.
Return NonZeroU64::MAX
on overflow.
§Examples
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));
Runsourcepub const unsafe fn unchecked_mul(self, other: Self) -> Self
🔬This is a nightly-only experimental API. (nonzero_ops
#84186)
pub const unsafe fn unchecked_mul(self, other: Self) -> Self
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<Self>
pub const fn checked_pow(self, other: u32) -> Option<Self>
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) -> Self
pub const fn saturating_pow(self, other: u32) -> Self
Raise non-zero value to an integer power.
Return NonZeroU64::MAX
on overflow.
§Examples
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));
RunTrait Implementations§
source§impl Binary for NonZeroU64
impl Binary for NonZeroU64
1.45.0 · source§impl BitOr<u64> for NonZeroU64
impl BitOr<u64> for NonZeroU64
1.45.0 · source§impl BitOr for NonZeroU64
impl BitOr for NonZeroU64
1.45.0 · source§impl BitOrAssign<u64> for NonZeroU64
impl BitOrAssign<u64> for NonZeroU64
source§fn bitor_assign(&mut self, rhs: u64)
fn bitor_assign(&mut self, rhs: u64)
|=
operation. Read more1.45.0 · source§impl BitOrAssign for NonZeroU64
impl BitOrAssign for NonZeroU64
source§fn bitor_assign(&mut self, rhs: Self)
fn bitor_assign(&mut self, rhs: Self)
|=
operation. Read moresource§impl Clone for NonZeroU64
impl Clone for NonZeroU64
source§impl Debug for NonZeroU64
impl Debug for NonZeroU64
source§impl Display for NonZeroU64
impl Display for NonZeroU64
1.41.0 · source§impl From<NonZero<u16>> for NonZeroU64
impl From<NonZero<u16>> for NonZeroU64
source§fn from(small: NonZeroU16) -> Self
fn from(small: NonZeroU16) -> Self
Converts NonZeroU16
to NonZeroU64
losslessly.
1.41.0 · source§impl From<NonZero<u32>> for NonZeroU64
impl From<NonZero<u32>> for NonZeroU64
source§fn from(small: NonZeroU32) -> Self
fn from(small: NonZeroU32) -> Self
Converts NonZeroU32
to NonZeroU64
losslessly.
1.35.0 · source§impl FromStr for NonZeroU64
impl FromStr for NonZeroU64
source§impl Hash for NonZeroU64
impl Hash for NonZeroU64
source§impl LowerHex for NonZeroU64
impl LowerHex for NonZeroU64
source§impl Octal for NonZeroU64
impl Octal for NonZeroU64
source§impl PartialEq for NonZeroU64
impl PartialEq for NonZeroU64
source§impl PartialOrd for NonZeroU64
impl PartialOrd for NonZeroU64
1.49.0 · source§impl TryFrom<NonZero<i128>> for NonZeroU64
impl TryFrom<NonZero<i128>> for NonZeroU64
source§fn 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 · source§impl TryFrom<NonZero<i16>> for NonZeroU64
impl TryFrom<NonZero<i16>> for NonZeroU64
source§fn 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 · source§impl TryFrom<NonZero<i32>> for NonZeroU64
impl TryFrom<NonZero<i32>> for NonZeroU64
source§fn 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 · source§impl TryFrom<NonZero<i64>> for NonZeroU64
impl TryFrom<NonZero<i64>> for NonZeroU64
source§fn 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 · source§impl TryFrom<NonZero<isize>> for NonZeroU64
impl TryFrom<NonZero<isize>> for NonZeroU64
source§fn 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 · source§impl TryFrom<NonZero<u128>> for NonZeroU64
impl TryFrom<NonZero<u128>> for NonZeroU64
source§fn 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 · source§impl TryFrom<NonZero<usize>> for NonZeroU64
impl TryFrom<NonZero<usize>> for NonZeroU64
source§fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
Attempts to convert NonZeroUsize
to NonZeroU64
.