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<NonZeroUsize>
is the same size as usize
:
use std::mem::size_of; assert_eq!(size_of::<Option<core::num::NonZeroUsize>>(), size_of::<usize>());Run
Implementations
impl NonZeroUsize
[src]
impl NonZeroUsize
[src]impl NonZeroUsize
[src]
impl NonZeroUsize
[src]pub const fn leading_zeros(self) -> u32
1.53.0 (const: 1.53.0)[src]
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::NonZeroUsize::new(usize::MAX).unwrap(); assert_eq!(n.leading_zeros(), 0);Run
pub const fn trailing_zeros(self) -> u32
1.53.0 (const: 1.53.0)[src]
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::NonZeroUsize::new(0b0101000).unwrap(); assert_eq!(n.trailing_zeros(), 3);Run
impl NonZeroUsize
[src]
impl NonZeroUsize
[src]pub const fn is_power_of_two(self) -> bool
[src]
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:
#![feature(nonzero_is_power_of_two)] let eight = std::num::NonZeroUsize::new(8).unwrap(); assert!(eight.is_power_of_two()); let ten = std::num::NonZeroUsize::new(10).unwrap(); assert!(!ten.is_power_of_two());Run
Trait Implementations
impl BitOr<NonZeroUsize> for NonZeroUsize
1.45.0[src]
impl BitOr<NonZeroUsize> for NonZeroUsize
1.45.0[src]impl BitOr<NonZeroUsize> for usize
1.45.0[src]
impl BitOr<NonZeroUsize> for usize
1.45.0[src]type Output = NonZeroUsize
The resulting type after applying the |
operator.
fn bitor(self, rhs: NonZeroUsize) -> Self::Output
[src]
impl BitOr<usize> for NonZeroUsize
1.45.0[src]
impl BitOr<usize> for NonZeroUsize
1.45.0[src]impl BitOrAssign<NonZeroUsize> for NonZeroUsize
1.45.0[src]
impl BitOrAssign<NonZeroUsize> for NonZeroUsize
1.45.0[src]fn bitor_assign(&mut self, rhs: Self)
[src]
impl BitOrAssign<usize> for NonZeroUsize
1.45.0[src]
impl BitOrAssign<usize> for NonZeroUsize
1.45.0[src]fn bitor_assign(&mut self, rhs: usize)
[src]
impl Clone for NonZeroUsize
[src]
impl Clone for NonZeroUsize
[src]fn clone(&self) -> NonZeroUsize
[src]
fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl Div<NonZeroUsize> for usize
1.51.0[src]
impl Div<NonZeroUsize> for usize
1.51.0[src]type Output = usize
The resulting type after applying the /
operator.
fn div(self, other: NonZeroUsize) -> usize
[src]
This operation rounds towards zero, truncating any fractional part of the exact result, and cannot panic.
impl From<NonZeroU16> for NonZeroUsize
1.41.0[src]
impl From<NonZeroU16> for NonZeroUsize
1.41.0[src]fn from(small: NonZeroU16) -> Self
[src]
Converts NonZeroU16
to NonZeroUsize
losslessly.
impl From<NonZeroU8> for NonZeroUsize
1.41.0[src]
impl From<NonZeroU8> for NonZeroUsize
1.41.0[src]impl From<NonZeroUsize> for usize
1.31.0[src]
impl From<NonZeroUsize> for usize
1.31.0[src]fn from(nonzero: NonZeroUsize) -> Self
[src]
Converts a NonZeroUsize
into an usize
impl FromStr for NonZeroUsize
1.35.0[src]
impl FromStr for NonZeroUsize
1.35.0[src]impl Hash for NonZeroUsize
[src]
impl Hash for NonZeroUsize
[src]impl Ord for NonZeroUsize
[src]
impl Ord for NonZeroUsize
[src]impl PartialEq<NonZeroUsize> for NonZeroUsize
[src]
impl PartialEq<NonZeroUsize> for NonZeroUsize
[src]fn eq(&self, other: &NonZeroUsize) -> bool
[src]
fn ne(&self, other: &NonZeroUsize) -> bool
[src]
impl PartialOrd<NonZeroUsize> for NonZeroUsize
[src]
impl PartialOrd<NonZeroUsize> for NonZeroUsize
[src]impl Rem<NonZeroUsize> for usize
1.51.0[src]
impl Rem<NonZeroUsize> for usize
1.51.0[src]type Output = usize
The resulting type after applying the %
operator.
fn rem(self, other: NonZeroUsize) -> usize
[src]
This operation satisfies n % d == n - (n / d) * d
, and cannot panic.
impl TryFrom<NonZeroI128> for NonZeroUsize
1.49.0[src]
impl TryFrom<NonZeroI128> for NonZeroUsize
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroI128) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroI128
to NonZeroUsize
.
impl TryFrom<NonZeroI16> for NonZeroUsize
1.49.0[src]
impl TryFrom<NonZeroI16> for NonZeroUsize
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroI16) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroI16
to NonZeroUsize
.
impl TryFrom<NonZeroI32> for NonZeroUsize
1.49.0[src]
impl TryFrom<NonZeroI32> for NonZeroUsize
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroI32
to NonZeroUsize
.
impl TryFrom<NonZeroI64> for NonZeroUsize
1.49.0[src]
impl TryFrom<NonZeroI64> for NonZeroUsize
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroI64
to NonZeroUsize
.
impl TryFrom<NonZeroI8> for NonZeroUsize
1.49.0[src]
impl TryFrom<NonZeroI8> for NonZeroUsize
1.49.0[src]impl TryFrom<NonZeroIsize> for NonZeroUsize
1.49.0[src]
impl TryFrom<NonZeroIsize> for NonZeroUsize
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroIsize) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroIsize
to NonZeroUsize
.
impl TryFrom<NonZeroU128> for NonZeroUsize
1.49.0[src]
impl TryFrom<NonZeroU128> for NonZeroUsize
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroU128) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroU128
to NonZeroUsize
.
impl TryFrom<NonZeroU32> for NonZeroUsize
1.49.0[src]
impl TryFrom<NonZeroU32> for NonZeroUsize
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroU32) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroU32
to NonZeroUsize
.
impl TryFrom<NonZeroU64> for NonZeroUsize
1.49.0[src]
impl TryFrom<NonZeroU64> for NonZeroUsize
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroU64
to NonZeroUsize
.
impl TryFrom<NonZeroUsize> for NonZeroU8
1.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroU8
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroUsize
to NonZeroU8
.
impl TryFrom<NonZeroUsize> for NonZeroU16
1.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroU16
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroUsize
to NonZeroU16
.
impl TryFrom<NonZeroUsize> for NonZeroIsize
1.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroIsize
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroUsize
to NonZeroIsize
.
impl TryFrom<NonZeroUsize> for NonZeroU32
1.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroU32
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroUsize
to NonZeroU32
.
impl TryFrom<NonZeroUsize> for NonZeroU64
1.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroU64
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroUsize
to NonZeroU64
.
impl TryFrom<NonZeroUsize> for NonZeroU128
1.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroU128
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroUsize
to NonZeroU128
.
impl TryFrom<NonZeroUsize> for NonZeroI8
1.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroI8
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroUsize
to NonZeroI8
.
impl TryFrom<NonZeroUsize> for NonZeroI16
1.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroI16
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroUsize
to NonZeroI16
.
impl TryFrom<NonZeroUsize> for NonZeroI32
1.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroI32
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroUsize
to NonZeroI32
.
impl TryFrom<NonZeroUsize> for NonZeroI64
1.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroI64
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroUsize
to NonZeroI64
.
impl TryFrom<NonZeroUsize> for NonZeroI128
1.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroI128
1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
Attempts to convert NonZeroUsize
to NonZeroI128
.
impl TryFrom<usize> for NonZeroUsize
1.46.0[src]
impl TryFrom<usize> for NonZeroUsize
1.46.0[src]