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) -> u321.53.0 (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) -> u321.53.0 (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 NonZeroUsize1.45.0[src]
impl BitOr<NonZeroUsize> for NonZeroUsize1.45.0[src]impl BitOr<NonZeroUsize> for usize1.45.0[src]
impl BitOr<NonZeroUsize> for usize1.45.0[src]type Output = NonZeroUsize
The resulting type after applying the | operator.
fn bitor(self, rhs: NonZeroUsize) -> Self::Output[src]
impl BitOr<usize> for NonZeroUsize1.45.0[src]
impl BitOr<usize> for NonZeroUsize1.45.0[src]impl BitOrAssign<NonZeroUsize> for NonZeroUsize1.45.0[src]
impl BitOrAssign<NonZeroUsize> for NonZeroUsize1.45.0[src]fn bitor_assign(&mut self, rhs: Self)[src]
impl BitOrAssign<usize> for NonZeroUsize1.45.0[src]
impl BitOrAssign<usize> for NonZeroUsize1.45.0[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 usize1.51.0[src]
impl Div<NonZeroUsize> for usize1.51.0[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 NonZeroUsize1.41.0[src]
impl From<NonZeroU16> for NonZeroUsize1.41.0[src]fn from(small: NonZeroU16) -> Self[src]
Converts NonZeroU16 to NonZeroUsize losslessly.
impl From<NonZeroU8> for NonZeroUsize1.41.0[src]
impl From<NonZeroU8> for NonZeroUsize1.41.0[src]impl From<NonZeroUsize> for usize1.31.0[src]
impl From<NonZeroUsize> for usize1.31.0[src]fn from(nonzero: NonZeroUsize) -> Self[src]
Converts a NonZeroUsize into an usize
impl FromStr for NonZeroUsize1.35.0[src]
impl FromStr for NonZeroUsize1.35.0[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 usize1.51.0[src]
impl Rem<NonZeroUsize> for usize1.51.0[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 NonZeroUsize1.49.0[src]
impl TryFrom<NonZeroI128> for NonZeroUsize1.49.0[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 NonZeroUsize1.49.0[src]
impl TryFrom<NonZeroI16> for NonZeroUsize1.49.0[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 NonZeroUsize1.49.0[src]
impl TryFrom<NonZeroI32> for NonZeroUsize1.49.0[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 NonZeroUsize1.49.0[src]
impl TryFrom<NonZeroI64> for NonZeroUsize1.49.0[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 NonZeroUsize1.49.0[src]
impl TryFrom<NonZeroI8> for NonZeroUsize1.49.0[src]impl TryFrom<NonZeroIsize> for NonZeroUsize1.49.0[src]
impl TryFrom<NonZeroIsize> for NonZeroUsize1.49.0[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 NonZeroUsize1.49.0[src]
impl TryFrom<NonZeroU128> for NonZeroUsize1.49.0[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 NonZeroUsize1.49.0[src]
impl TryFrom<NonZeroU32> for NonZeroUsize1.49.0[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 NonZeroUsize1.49.0[src]
impl TryFrom<NonZeroU64> for NonZeroUsize1.49.0[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 NonZeroU81.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroU81.49.0[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 NonZeroU161.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroU161.49.0[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 NonZeroIsize1.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroIsize1.49.0[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 NonZeroU321.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroU321.49.0[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 NonZeroU641.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroU641.49.0[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 NonZeroU1281.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroU1281.49.0[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 NonZeroI81.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroI81.49.0[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 NonZeroI161.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroI161.49.0[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 NonZeroI321.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroI321.49.0[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 NonZeroI641.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroI641.49.0[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 NonZeroI1281.49.0[src]
impl TryFrom<NonZeroUsize> for NonZeroI1281.49.0[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 NonZeroUsize1.46.0[src]
impl TryFrom<usize> for NonZeroUsize1.46.0[src]