Struct std::num::NonZeroI8 1.34.0[−][src]
#[repr(transparent)]pub struct NonZeroI8(_);
Expand description
已知不等于零的整数。
这样可以进行一些内存布局优化。
For example, Option<NonZeroI8>
is the same size as i8
:
use std::mem::size_of;
assert_eq!(size_of::<Option<core::num::NonZeroI8>>(), size_of::<i8>());
RunImplementations
计算 self 的绝对值,带有溢出信息,请参见
Example
#![feature(nonzero_ops)]
let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;
let min = NonZeroI8::new(i8::MIN)?;
assert_eq!((pos, false), pos.overflowing_abs());
assert_eq!((pos, false), neg.overflowing_abs());
assert_eq!((min, true), min.overflowing_abs());
Run饱和绝对值,请参见
i8::saturating_abs
.
Example
#![feature(nonzero_ops)]
let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;
let min = NonZeroI8::new(i8::MIN)?;
let min_plus = NonZeroI8::new(i8::MIN + 1)?;
let max = NonZeroI8::new(i8::MAX)?;
assert_eq!(pos, pos.saturating_abs());
assert_eq!(pos, neg.saturating_abs());
assert_eq!(max, min.saturating_abs());
assert_eq!(max, min_plus.saturating_abs());
Run包装绝对值,请参见
i8::wrapping_abs
.
Example
#![feature(nonzero_ops)]
let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;
let min = NonZeroI8::new(i8::MIN)?;
let max = NonZeroI8::new(i8::MAX)?;
assert_eq!(pos, pos.wrapping_abs());
assert_eq!(pos, neg.wrapping_abs());
assert_eq!(min, min.wrapping_abs());
Run在没有任何包装或 panicking 的情况下计算 self 的绝对值。
Example
#![feature(nonzero_ops)]
let u_pos = NonZeroU8::new(1)?;
let i_pos = NonZeroI8::new(1)?;
let i_neg = NonZeroI8::new(-1)?;
let i_min = NonZeroI8::new(i8::MIN)?;
let u_max = NonZeroU8::new(u8::MAX / 2 + 1)?;
assert_eq!(u_pos, i_pos.unsigned_abs());
assert_eq!(u_pos, i_neg.unsigned_abs());
assert_eq!(u_max, i_min.unsigned_abs());
RunTrait Implementations
执行 |=
操作。 Read more
执行 |=
操作。 Read more
Converts NonZeroI8
to NonZeroIsize
losslessly.
Converts NonZeroI8
to NonZeroI16
losslessly.
Converts NonZeroI8
to NonZeroI32
losslessly.
Converts NonZeroI8
to NonZeroI128
losslessly.
Converts NonZeroI8
to NonZeroI64
losslessly.
如果存在,则此方法返回 self
和 other
值之间的顺序。 Read more
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI128>>::Error>
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI128>>::Error>
Attempts to convert NonZeroI128
to NonZeroI8
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI16>>::Error>
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI16>>::Error>
Attempts to convert NonZeroI16
to NonZeroI8
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI32>>::Error>
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI32>>::Error>
Attempts to convert NonZeroI32
to NonZeroI8
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI64>>::Error>
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI64>>::Error>
Attempts to convert NonZeroI64
to NonZeroI8
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI8>>::Error>
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI8>>::Error>
Attempts to convert NonZeroI8
to NonZeroUsize
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI8>>::Error>
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI8>>::Error>
Attempts to convert NonZeroI8
to NonZeroU128
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI8>>::Error>
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI8>>::Error>
Attempts to convert NonZeroI8
to NonZeroU32
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI8>>::Error>
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI8>>::Error>
Attempts to convert NonZeroI8
to NonZeroU16
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI8>>::Error>
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI8>>::Error>
Attempts to convert NonZeroI8
to NonZeroU64
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroIsize>>::Error>
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroIsize>>::Error>
Attempts to convert NonZeroIsize
to NonZeroI8
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU128>>::Error>
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU128>>::Error>
Attempts to convert NonZeroU128
to NonZeroI8
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU16>>::Error>
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU16>>::Error>
Attempts to convert NonZeroU16
to NonZeroI8
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU32>>::Error>
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU32>>::Error>
Attempts to convert NonZeroU32
to NonZeroI8
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU64>>::Error>
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU64>>::Error>
Attempts to convert NonZeroU64
to NonZeroI8
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroUsize>>::Error>
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroUsize>>::Error>
Attempts to convert NonZeroUsize
to NonZeroI8
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。