#[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>());
RunLayout
NonZeroI8
is guaranteed to have the same layout and bit validity as i8
除了 0
不是有效实例。
Option<NonZeroI8>
is guaranteed to be compatible with i8
,
包括在 FFI 中。
Implementations§
source§impl NonZeroI8
impl NonZeroI8
1.53.0 (const: 1.53.0) · sourcepub const fn leading_zeros(self) -> u32
pub const fn leading_zeros(self) -> u32
1.53.0 (const: 1.53.0) · sourcepub const fn trailing_zeros(self) -> u32
pub const fn trailing_zeros(self) -> u32
source§impl NonZeroI8
impl NonZeroI8
1.64.0 (const: 1.64.0) · sourcepub const fn checked_abs(self) -> Option<NonZeroI8>
pub const fn checked_abs(self) -> Option<NonZeroI8>
1.64.0 (const: 1.64.0) · sourcepub const fn overflowing_abs(self) -> (NonZeroI8, bool)
pub const fn overflowing_abs(self) -> (NonZeroI8, bool)
1.64.0 (const: 1.64.0) · sourcepub const fn saturating_abs(self) -> NonZeroI8
pub const fn saturating_abs(self) -> NonZeroI8
饱和绝对值,请参见
i8::saturating_abs
.
Example
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());
Run1.64.0 (const: 1.64.0) · sourcepub const fn wrapping_abs(self) -> NonZeroI8
pub const fn wrapping_abs(self) -> NonZeroI8
包装绝对值,请参见
i8::wrapping_abs
.
Example
let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;
let min = NonZeroI8::new(i8::MIN)?;
assert_eq!(pos, pos.wrapping_abs());
assert_eq!(pos, neg.wrapping_abs());
assert_eq!(min, min.wrapping_abs());
assert_eq!(max, (-max).wrapping_abs());
Run1.64.0 (const: 1.64.0) · sourcepub const fn unsigned_abs(self) -> NonZeroU8
pub const fn unsigned_abs(self) -> NonZeroU8
在没有任何包装或 panicking 的情况下计算 self 的绝对值。
Example
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());
Run1.71.0 (const: 1.71.0) · sourcepub const fn is_positive(self) -> bool
pub const fn is_positive(self) -> bool
1.71.0 (const: 1.71.0) · sourcepub const fn is_negative(self) -> bool
pub const fn is_negative(self) -> bool
1.71.0 (const: 1.71.0) · sourcepub const fn checked_neg(self) -> Option<NonZeroI8>
pub const fn checked_neg(self) -> Option<NonZeroI8>
1.71.0 (const: 1.71.0) · sourcepub const fn overflowing_neg(self) -> (NonZeroI8, bool)
pub const fn overflowing_neg(self) -> (NonZeroI8, bool)
否定 self,如果等于最小值,则溢出。
See i8::overflowing_neg
有关溢出行为的文档。
Example
let pos_five = NonZeroI8::new(5)?;
let neg_five = NonZeroI8::new(-5)?;
let min = NonZeroI8::new(i8::MIN)?;
assert_eq!(pos_five.overflowing_neg(), (neg_five, false));
assert_eq!(min.overflowing_neg(), (min, true));
Run1.71.0 (const: 1.71.0) · sourcepub const fn saturating_neg(self) -> NonZeroI8
pub const fn saturating_neg(self) -> NonZeroI8
饱和否定。计算 -self
,如果 self == i32::MIN
而不是溢出则返回 MAX
。
Example
let pos_five = NonZeroI8::new(5)?;
let neg_five = NonZeroI8::new(-5)?;
let min = NonZeroI8::new(i8::MIN)?;
let min_plus_one = NonZeroI8::new(i8::MIN + 1)?;
let max = NonZeroI8::new(i8::MAX)?;
assert_eq!(pos_five.saturating_neg(), neg_five);
assert_eq!(min.saturating_neg(), max);
assert_eq!(max.saturating_neg(), min_plus_one);
Run1.71.0 (const: 1.71.0) · sourcepub const fn wrapping_neg(self) -> NonZeroI8
pub const fn wrapping_neg(self) -> NonZeroI8
包装 (modular) 取反。
计算 -self
,在类型的边界处回绕。
See i8::wrapping_neg
有关溢出行为的文档。
Example
let pos_five = NonZeroI8::new(5)?;
let neg_five = NonZeroI8::new(-5)?;
let min = NonZeroI8::new(i8::MIN)?;
assert_eq!(pos_five.wrapping_neg(), neg_five);
assert_eq!(min.wrapping_neg(), min);
Runsource§impl NonZeroI8
impl NonZeroI8
1.64.0 (const: 1.64.0) · sourcepub const fn checked_mul(self, other: NonZeroI8) -> Option<NonZeroI8>
pub const fn checked_mul(self, other: NonZeroI8) -> Option<NonZeroI8>
1.64.0 (const: 1.64.0) · sourcepub const fn saturating_mul(self, other: NonZeroI8) -> NonZeroI8
pub const fn saturating_mul(self, other: NonZeroI8) -> NonZeroI8
sourcepub const unsafe fn unchecked_mul(self, other: NonZeroI8) -> NonZeroI8
🔬This is a nightly-only experimental API. (nonzero_ops
#84186)
pub const unsafe fn unchecked_mul(self, other: NonZeroI8) -> NonZeroI8
nonzero_ops
#84186)1.64.0 (const: 1.64.0) · sourcepub const fn checked_pow(self, other: u32) -> Option<NonZeroI8>
pub const fn checked_pow(self, other: u32) -> Option<NonZeroI8>
1.64.0 (const: 1.64.0) · sourcepub const fn saturating_pow(self, other: u32) -> NonZeroI8
pub const fn saturating_pow(self, other: u32) -> NonZeroI8
Trait Implementations§
1.45.0 · source§impl BitOrAssign<NonZeroI8> for NonZeroI8
impl BitOrAssign<NonZeroI8> for NonZeroI8
source§fn bitor_assign(&mut self, rhs: Self)
fn bitor_assign(&mut self, rhs: Self)
|=
操作。 Read more1.45.0 · source§impl BitOrAssign<i8> for NonZeroI8
impl BitOrAssign<i8> for NonZeroI8
source§fn bitor_assign(&mut self, rhs: i8)
fn bitor_assign(&mut self, rhs: i8)
|=
操作。 Read more1.41.0 · source§impl From<NonZeroI8> for NonZeroI128
impl From<NonZeroI8> for NonZeroI128
1.41.0 · source§impl From<NonZeroI8> for NonZeroI16
impl From<NonZeroI8> for NonZeroI16
1.41.0 · source§impl From<NonZeroI8> for NonZeroI32
impl From<NonZeroI8> for NonZeroI32
1.41.0 · source§impl From<NonZeroI8> for NonZeroI64
impl From<NonZeroI8> for NonZeroI64
1.41.0 · source§impl From<NonZeroI8> for NonZeroIsize
impl From<NonZeroI8> for NonZeroIsize
source§impl PartialOrd<NonZeroI8> for NonZeroI8
impl PartialOrd<NonZeroI8> for NonZeroI8
1.49.0 · source§impl TryFrom<NonZeroI128> for NonZeroI8
impl TryFrom<NonZeroI128> for NonZeroI8
source§fn try_from(value: NonZeroI128) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI128) -> Result<Self, Self::Error>
Attempts to convert NonZeroI128
to NonZeroI8
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI16> for NonZeroI8
impl TryFrom<NonZeroI16> for NonZeroI8
source§fn try_from(value: NonZeroI16) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI16) -> Result<Self, Self::Error>
Attempts to convert NonZeroI16
to NonZeroI8
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI32> for NonZeroI8
impl TryFrom<NonZeroI32> for NonZeroI8
source§fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
Attempts to convert NonZeroI32
to NonZeroI8
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI64> for NonZeroI8
impl TryFrom<NonZeroI64> for NonZeroI8
source§fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>
Attempts to convert NonZeroI64
to NonZeroI8
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI8> for NonZeroU128
impl TryFrom<NonZeroI8> for NonZeroU128
1.49.0 · source§impl TryFrom<NonZeroI8> for NonZeroU16
impl TryFrom<NonZeroI8> for NonZeroU16
1.49.0 · source§impl TryFrom<NonZeroI8> for NonZeroU32
impl TryFrom<NonZeroI8> for NonZeroU32
1.49.0 · source§impl TryFrom<NonZeroI8> for NonZeroU64
impl TryFrom<NonZeroI8> for NonZeroU64
1.49.0 · source§impl TryFrom<NonZeroI8> for NonZeroUsize
impl TryFrom<NonZeroI8> for NonZeroUsize
1.49.0 · source§impl TryFrom<NonZeroIsize> for NonZeroI8
impl TryFrom<NonZeroIsize> for NonZeroI8
source§fn try_from(value: NonZeroIsize) -> Result<Self, Self::Error>
fn try_from(value: NonZeroIsize) -> Result<Self, Self::Error>
Attempts to convert NonZeroIsize
to NonZeroI8
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroU128> for NonZeroI8
impl TryFrom<NonZeroU128> for NonZeroI8
source§fn try_from(value: NonZeroU128) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU128) -> Result<Self, Self::Error>
Attempts to convert NonZeroU128
to NonZeroI8
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroU16> for NonZeroI8
impl TryFrom<NonZeroU16> for NonZeroI8
source§fn try_from(value: NonZeroU16) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU16) -> Result<Self, Self::Error>
Attempts to convert NonZeroU16
to NonZeroI8
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroU32> for NonZeroI8
impl TryFrom<NonZeroU32> for NonZeroI8
source§fn try_from(value: NonZeroU32) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU32) -> Result<Self, Self::Error>
Attempts to convert NonZeroU32
to NonZeroI8
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroU64> for NonZeroI8
impl TryFrom<NonZeroU64> for NonZeroI8
source§fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
Attempts to convert NonZeroU64
to NonZeroI8
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroUsize> for NonZeroI8
impl TryFrom<NonZeroUsize> for NonZeroI8
source§fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
Attempts to convert NonZeroUsize
to NonZeroI8
.