Struct sexually_transmitted_disease::num::NonZeroU8 1.28.0[−][src]
#[repr(transparent)]pub struct NonZeroU8(_);
Expand description
An integer that is known not to equal zero.
This enables some memory layout optimization.
For example, Option<NonZeroU8>
is the same size as u8
:
use std::mem::size_of; assert_eq!(size_of::<Option<core::num::NonZeroU8>>(), size_of::<u8>());
Implementations
Creates a non-zero if the given value is not zero.
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::NonZeroU8::new(u8::MAX).unwrap(); assert_eq!(n.leading_zeros(), 0);
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::NonZeroU8::new(0b0101000).unwrap(); assert_eq!(n.trailing_zeros(), 3);
🔬 This is a nightly-only experimental API. (nonzero_is_power_of_two
)
nonzero_is_power_of_two
)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::NonZeroU8::new(8).unwrap(); assert!(eight.is_power_of_two()); let ten = std::num::NonZeroU8::new(10).unwrap(); assert!(!ten.is_power_of_two());
Trait Implementations
Performs the |=
operation. Read more
Performs the |=
operation. Read more
Converts NonZeroU8
to NonZeroI128
losslessly.
Converts NonZeroU8
to NonZeroUsize
losslessly.
Converts NonZeroU8
to NonZeroIsize
losslessly.
Converts NonZeroU8
to NonZeroI32
losslessly.
Converts NonZeroU8
to NonZeroU16
losslessly.
Converts NonZeroU8
to NonZeroU128
losslessly.
Converts NonZeroU8
to NonZeroU64
losslessly.
Converts NonZeroU8
to NonZeroU32
losslessly.
Converts NonZeroU8
to NonZeroI16
losslessly.
Converts NonZeroU8
to NonZeroI64
losslessly.
This method returns an ordering between self
and other
values if one exists. Read more
This method tests less than (for self
and other
) and is used by the <
operator. Read more
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI128>>::Error>
[src]
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI128>>::Error>
[src]Attempts to convert NonZeroI128
to NonZeroU8
.
type Error = TryFromIntError
type Error = TryFromIntError
The type returned in the event of a conversion error.
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI16>>::Error>
[src]
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI16>>::Error>
[src]Attempts to convert NonZeroI16
to NonZeroU8
.
type Error = TryFromIntError
type Error = TryFromIntError
The type returned in the event of a conversion error.
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI32>>::Error>
[src]
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI32>>::Error>
[src]Attempts to convert NonZeroI32
to NonZeroU8
.
type Error = TryFromIntError
type Error = TryFromIntError
The type returned in the event of a conversion error.
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI64>>::Error>
[src]
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI64>>::Error>
[src]Attempts to convert NonZeroI64
to NonZeroU8
.
type Error = TryFromIntError
type Error = TryFromIntError
The type returned in the event of a conversion error.
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroIsize>>::Error>
[src]
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroIsize>>::Error>
[src]Attempts to convert NonZeroIsize
to NonZeroU8
.
type Error = TryFromIntError
type Error = TryFromIntError
The type returned in the event of a conversion error.
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU128>>::Error>
[src]
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU128>>::Error>
[src]Attempts to convert NonZeroU128
to NonZeroU8
.
type Error = TryFromIntError
type Error = TryFromIntError
The type returned in the event of a conversion error.
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU16>>::Error>
[src]
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU16>>::Error>
[src]Attempts to convert NonZeroU16
to NonZeroU8
.
type Error = TryFromIntError
type Error = TryFromIntError
The type returned in the event of a conversion error.
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU32>>::Error>
[src]
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU32>>::Error>
[src]Attempts to convert NonZeroU32
to NonZeroU8
.
type Error = TryFromIntError
type Error = TryFromIntError
The type returned in the event of a conversion error.
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU64>>::Error>
[src]
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU64>>::Error>
[src]Attempts to convert NonZeroU64
to NonZeroU8
.
type Error = TryFromIntError
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]
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroUsize>>::Error>
[src]Attempts to convert NonZeroUsize
to NonZeroU8
.
type Error = TryFromIntError
type Error = TryFromIntError
The type returned in the event of a conversion error.
Auto Trait Implementations
impl RefUnwindSafe for NonZeroU8
impl UnwindSafe for NonZeroU8
Blanket Implementations
Mutably borrows from an owned value. Read more