Struct std::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]pub const unsafe fn new_unchecked(n: usize) -> NonZeroUsize1.28.0 (const: 1.28.0)[src]
pub const fn new(n: usize) -> Option<NonZeroUsize>1.28.0 (const: 1.47.0)[src]
Creates a non-zero if the given value is not zero.
pub const fn get(self) -> usize1.28.0 (const: 1.34.0)[src]
Returns the value as a primitive type.
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]type Output = NonZeroUsize
The resulting type after applying the | operator.
pub fn bitor(
self,
rhs: NonZeroUsize
) -> <NonZeroUsize as BitOr<NonZeroUsize>>::Output[src]
self,
rhs: NonZeroUsize
) -> <NonZeroUsize as BitOr<NonZeroUsize>>::Output
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.
pub fn bitor(self, rhs: NonZeroUsize) -> <usize as BitOr<NonZeroUsize>>::Output[src]
impl BitOr<usize> for NonZeroUsize1.45.0[src]
impl BitOr<usize> for NonZeroUsize1.45.0[src]type Output = NonZeroUsize
The resulting type after applying the | operator.
pub fn bitor(self, rhs: usize) -> <NonZeroUsize as BitOr<usize>>::Output[src]
impl BitOrAssign<NonZeroUsize> for NonZeroUsize1.45.0[src]
impl BitOrAssign<NonZeroUsize> for NonZeroUsize1.45.0[src]pub fn bitor_assign(&mut self, rhs: NonZeroUsize)[src]
impl BitOrAssign<usize> for NonZeroUsize1.45.0[src]
impl BitOrAssign<usize> for NonZeroUsize1.45.0[src]pub fn bitor_assign(&mut self, rhs: usize)[src]
impl Clone for NonZeroUsize[src]
impl Clone for NonZeroUsize[src]pub fn clone(&self) -> NonZeroUsize[src]
pub fn clone_from(&mut self, source: &Self)1.0.0[src]
impl Display for NonZeroUsize[src]
impl Display for NonZeroUsize[src]impl Div<NonZeroUsize> for usize1.51.0[src]
impl Div<NonZeroUsize> for usize1.51.0[src]impl From<NonZeroU16> for NonZeroUsize1.41.0[src]
impl From<NonZeroU16> for NonZeroUsize1.41.0[src]pub fn from(small: NonZeroU16) -> NonZeroUsize[src]
Converts NonZeroU16 to NonZeroUsize losslessly.
impl From<NonZeroU8> for NonZeroUsize1.41.0[src]
impl From<NonZeroU8> for NonZeroUsize1.41.0[src]pub fn from(small: NonZeroU8) -> NonZeroUsize[src]
Converts NonZeroU8 to NonZeroUsize losslessly.
impl From<NonZeroUsize> for usize1.31.0[src]
impl From<NonZeroUsize> for usize1.31.0[src]pub fn from(nonzero: NonZeroUsize) -> usize[src]
Converts a NonZeroUsize into an usize
impl FromStr for NonZeroUsize1.35.0[src]
impl FromStr for NonZeroUsize1.35.0[src]type Err = ParseIntError
The associated error which can be returned from parsing.
pub fn from_str(
src: &str
) -> Result<NonZeroUsize, <NonZeroUsize as FromStr>::Err>[src]
src: &str
) -> Result<NonZeroUsize, <NonZeroUsize as FromStr>::Err>
impl Hash for NonZeroUsize[src]
impl Hash for NonZeroUsize[src]impl LowerHex for NonZeroUsize[src]
impl LowerHex 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]pub fn eq(&self, other: &NonZeroUsize) -> bool[src]
pub fn ne(&self, other: &NonZeroUsize) -> bool[src]
impl PartialOrd<NonZeroUsize> for NonZeroUsize[src]
impl PartialOrd<NonZeroUsize> for NonZeroUsize[src]pub fn partial_cmp(&self, other: &NonZeroUsize) -> Option<Ordering>[src]
#[must_use]pub fn lt(&self, other: &Rhs) -> bool1.0.0[src]
#[must_use]pub fn le(&self, other: &Rhs) -> bool1.0.0[src]
#[must_use]pub fn gt(&self, other: &Rhs) -> bool1.0.0[src]
#[must_use]pub fn ge(&self, other: &Rhs) -> bool1.0.0[src]
impl Rem<NonZeroUsize> for usize1.51.0[src]
impl Rem<NonZeroUsize> for usize1.51.0[src]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.
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI128>>::Error>[src]
value: NonZeroI128
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI128>>::Error>
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.
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI16>>::Error>[src]
value: NonZeroI16
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI16>>::Error>
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.
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI32>>::Error>[src]
value: NonZeroI32
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI32>>::Error>
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.
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI64>>::Error>[src]
value: NonZeroI64
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI64>>::Error>
Attempts to convert NonZeroI64 to NonZeroUsize.
impl TryFrom<NonZeroI8> for NonZeroUsize1.49.0[src]
impl TryFrom<NonZeroI8> for NonZeroUsize1.49.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI8>>::Error>[src]
value: NonZeroI8
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI8>>::Error>
Attempts to convert NonZeroI8 to NonZeroUsize.
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.
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroIsize>>::Error>[src]
value: NonZeroIsize
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroIsize>>::Error>
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.
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroU128>>::Error>[src]
value: NonZeroU128
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroU128>>::Error>
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.
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroU32>>::Error>[src]
value: NonZeroU32
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroU32>>::Error>
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.
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroU64>>::Error>[src]
value: NonZeroU64
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroU64>>::Error>
Attempts to convert NonZeroU64 to NonZeroUsize.
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.
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroUsize>>::Error>[src]
value: NonZeroUsize
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroUsize>>::Error>
Attempts to convert NonZeroUsize to NonZeroU16.
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.
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroUsize>>::Error>[src]
value: NonZeroUsize
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroUsize>>::Error>
Attempts to convert NonZeroUsize to NonZeroI16.
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.
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroUsize>>::Error>[src]
value: NonZeroUsize
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroUsize>>::Error>
Attempts to convert NonZeroUsize to NonZeroU32.
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.
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI64, <NonZeroI64 as TryFrom<NonZeroUsize>>::Error>[src]
value: NonZeroUsize
) -> Result<NonZeroI64, <NonZeroI64 as TryFrom<NonZeroUsize>>::Error>
Attempts to convert NonZeroUsize to NonZeroI64.
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.
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroUsize>>::Error>[src]
value: NonZeroUsize
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroUsize>>::Error>
Attempts to convert NonZeroUsize to NonZeroU64.
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.
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroUsize>>::Error>[src]
value: NonZeroUsize
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroUsize>>::Error>
Attempts to convert NonZeroUsize to NonZeroIsize.
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.
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroUsize>>::Error>[src]
value: NonZeroUsize
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroUsize>>::Error>
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.
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroUsize>>::Error>[src]
value: NonZeroUsize
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroUsize>>::Error>
Attempts to convert NonZeroUsize to NonZeroI8.
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.
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroUsize>>::Error>[src]
value: NonZeroUsize
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroUsize>>::Error>
Attempts to convert NonZeroUsize to NonZeroU8.
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.
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI128, <NonZeroI128 as TryFrom<NonZeroUsize>>::Error>[src]
value: NonZeroUsize
) -> Result<NonZeroI128, <NonZeroI128 as TryFrom<NonZeroUsize>>::Error>
Attempts to convert NonZeroUsize to NonZeroI128.
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.
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroUsize>>::Error>[src]
value: NonZeroUsize
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroUsize>>::Error>
Attempts to convert NonZeroUsize to NonZeroI32.
impl TryFrom<usize> for NonZeroUsize1.46.0[src]
impl TryFrom<usize> for NonZeroUsize1.46.0[src]type Error = TryFromIntError
The type returned in the event of a conversion error.
pub fn try_from(
value: usize
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<usize>>::Error>[src]
value: usize
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<usize>>::Error>
Attempts to convert usize to NonZeroUsize.
impl UpperHex for NonZeroUsize[src]
impl UpperHex for NonZeroUsize[src]impl Copy for NonZeroUsize[src]
impl Eq for NonZeroUsize[src]
impl StructuralEq for NonZeroUsize[src]
impl StructuralPartialEq for NonZeroUsize[src]
Auto Trait Implementations
impl RefUnwindSafe for NonZeroUsize
impl Send for NonZeroUsize
impl Sync for NonZeroUsize
impl Unpin for NonZeroUsize
impl UnwindSafe for NonZeroUsize
Blanket Implementations
impl<T> Borrow<T> for T where
T: ?Sized, [src]
impl<T> Borrow<T> for T where
T: ?Sized, [src]pub fn borrow(&self) -> &TⓘNotable traits for &'_ mut F
impl<'_, F> Future for &'_ mut F where
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<R: Read + ?Sized> Read for &mut Rimpl<W: Write + ?Sized> Write for &mut W[src]
Notable traits for &'_ mut F
impl<'_, F> Future for &'_ mut F where
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<R: Read + ?Sized> Read for &mut Rimpl<W: Write + ?Sized> Write for &mut Wimpl<T> BorrowMut<T> for T where
T: ?Sized, [src]
impl<T> BorrowMut<T> for T where
T: ?Sized, [src]pub fn borrow_mut(&mut self) -> &mut TⓘNotable traits for &'_ mut F
impl<'_, F> Future for &'_ mut F where
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<R: Read + ?Sized> Read for &mut Rimpl<W: Write + ?Sized> Write for &mut W[src]
Notable traits for &'_ mut F
impl<'_, F> Future for &'_ mut F where
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<R: Read + ?Sized> Read for &mut Rimpl<W: Write + ?Sized> Write for &mut W