Struct core::num::NonZeroUsize 1.28.0[−][src]
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]
pub const unsafe fn new_unchecked(n: usize) -> Self
1.28.0 (const: 1.34.0)[src]
pub const fn new(n: usize) -> Option<Self>
1.28.0 (const: 1.47.0)[src]
Creates a non-zero if the given value is not zero.
pub const fn get(self) -> usize
1.28.0 (const: 1.34.0)[src]
Returns the value as a primitive type.
impl NonZeroUsize
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pub fn leading_zeros(self) -> u32
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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:
#![feature(nonzero_leading_trailing_zeros)] let n = std::num::NonZeroUsize::new(usize::MAX).unwrap(); assert_eq!(n.leading_zeros(), 0);Run
pub fn trailing_zeros(self) -> u32
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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:
#![feature(nonzero_leading_trailing_zeros)] let n = std::num::NonZeroUsize::new(0b0101000).unwrap(); assert_eq!(n.trailing_zeros(), 3);Run
impl NonZeroUsize
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pub const fn is_power_of_two(self) -> bool
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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 Binary for NonZeroUsize
[src]
impl BitOr<NonZeroUsize> for NonZeroUsize
1.45.0[src]
type Output = Self
The resulting type after applying the |
operator.
fn bitor(self, rhs: Self) -> Self::Output
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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]
type Output = Self
The resulting type after applying the |
operator.
fn bitor(self, rhs: usize) -> Self::Output
[src]
impl BitOrAssign<NonZeroUsize> for NonZeroUsize
1.45.0[src]
fn bitor_assign(&mut self, rhs: Self)
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impl BitOrAssign<usize> for NonZeroUsize
1.45.0[src]
fn bitor_assign(&mut self, rhs: usize)
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impl Clone for NonZeroUsize
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fn clone(&self) -> NonZeroUsize
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl Copy for NonZeroUsize
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impl Debug for NonZeroUsize
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impl Display for NonZeroUsize
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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
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This operation rounds towards zero, truncating any fractional part of the exact result, and cannot panic.
impl Eq for NonZeroUsize
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impl From<NonZeroU16> for NonZeroUsize
1.41.0[src]
Converts NonZeroU16
to NonZeroUsize
losslessly.
fn from(small: NonZeroU16) -> Self
[src]
impl From<NonZeroU8> for NonZeroUsize
1.41.0[src]
Converts NonZeroU8
to NonZeroUsize
losslessly.
impl From<NonZeroUsize> for usize
1.31.0[src]
fn from(nonzero: NonZeroUsize) -> Self
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Converts a NonZeroUsize
into an usize
impl FromStr for NonZeroUsize
1.35.0[src]
type Err = ParseIntError
The associated error which can be returned from parsing.
fn from_str(src: &str) -> Result<Self, Self::Err>
[src]
impl Hash for NonZeroUsize
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fn hash<__H: Hasher>(&self, state: &mut __H)
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fn hash_slice<H: Hasher>(data: &[Self], state: &mut H) where
Self: Sized,
1.3.0[src]
Self: Sized,
impl LowerHex for NonZeroUsize
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impl Octal for NonZeroUsize
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impl Ord for NonZeroUsize
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fn cmp(&self, other: &NonZeroUsize) -> Ordering
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#[must_use]fn max(self, other: Self) -> Self where
Self: Sized,
1.21.0[src]
Self: Sized,
#[must_use]fn min(self, other: Self) -> Self where
Self: Sized,
1.21.0[src]
Self: Sized,
#[must_use]fn clamp(self, min: Self, max: Self) -> Self where
Self: Sized,
1.50.0[src]
Self: Sized,
impl PartialEq<NonZeroUsize> for NonZeroUsize
[src]
fn eq(&self, other: &NonZeroUsize) -> bool
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fn ne(&self, other: &NonZeroUsize) -> bool
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impl PartialOrd<NonZeroUsize> for NonZeroUsize
[src]
fn partial_cmp(&self, other: &NonZeroUsize) -> Option<Ordering>
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#[must_use]fn lt(&self, other: &Rhs) -> bool
1.0.0[src]
#[must_use]fn le(&self, other: &Rhs) -> bool
1.0.0[src]
#[must_use]fn gt(&self, other: &Rhs) -> bool
1.0.0[src]
#[must_use]fn ge(&self, other: &Rhs) -> bool
1.0.0[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
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This operation satisfies n % d == n - (n / d) * d
, and cannot panic.
impl StructuralEq for NonZeroUsize
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impl StructuralPartialEq for NonZeroUsize
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impl TryFrom<NonZeroI128> for NonZeroUsize
1.49.0[src]
Attempts to convert NonZeroI128
to NonZeroUsize
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroI128) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroI16> for NonZeroUsize
1.49.0[src]
Attempts to convert NonZeroI16
to NonZeroUsize
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroI16) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroI32> for NonZeroUsize
1.49.0[src]
Attempts to convert NonZeroI32
to NonZeroUsize
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroI64> for NonZeroUsize
1.49.0[src]
Attempts to convert NonZeroI64
to NonZeroUsize
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroI8> for NonZeroUsize
1.49.0[src]
Attempts to convert NonZeroI8
to NonZeroUsize
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroI8) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroIsize> for NonZeroUsize
1.49.0[src]
Attempts to convert NonZeroIsize
to NonZeroUsize
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroIsize) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroU128> for NonZeroUsize
1.49.0[src]
Attempts to convert NonZeroU128
to NonZeroUsize
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroU128) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroU32> for NonZeroUsize
1.49.0[src]
Attempts to convert NonZeroU32
to NonZeroUsize
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroU32) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroU64> for NonZeroUsize
1.49.0[src]
Attempts to convert NonZeroU64
to NonZeroUsize
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroUsize> for NonZeroU8
1.49.0[src]
Attempts to convert NonZeroUsize
to NonZeroU8
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroUsize> for NonZeroU16
1.49.0[src]
Attempts to convert NonZeroUsize
to NonZeroU16
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroUsize> for NonZeroIsize
1.49.0[src]
Attempts to convert NonZeroUsize
to NonZeroIsize
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroUsize> for NonZeroU32
1.49.0[src]
Attempts to convert NonZeroUsize
to NonZeroU32
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroUsize> for NonZeroU64
1.49.0[src]
Attempts to convert NonZeroUsize
to NonZeroU64
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroUsize> for NonZeroU128
1.49.0[src]
Attempts to convert NonZeroUsize
to NonZeroU128
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroUsize> for NonZeroI8
1.49.0[src]
Attempts to convert NonZeroUsize
to NonZeroI8
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroUsize> for NonZeroI16
1.49.0[src]
Attempts to convert NonZeroUsize
to NonZeroI16
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroUsize> for NonZeroI32
1.49.0[src]
Attempts to convert NonZeroUsize
to NonZeroI32
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroUsize> for NonZeroI64
1.49.0[src]
Attempts to convert NonZeroUsize
to NonZeroI64
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
impl TryFrom<NonZeroUsize> for NonZeroI128
1.49.0[src]
Attempts to convert NonZeroUsize
to NonZeroI128
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
[src]
impl TryFrom<usize> for NonZeroUsize
1.46.0[src]
Attempts to convert usize
to NonZeroUsize
.
type Error = TryFromIntError
The type returned in the event of a conversion error.
fn try_from(value: usize) -> Result<Self, Self::Error>
[src]
impl UpperHex for NonZeroUsize
[src]
Auto Trait Implementations
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut Self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,