Struct std::num::NonZeroU16 1.28.0[−][src]
#[repr(transparent)]pub struct NonZeroU16(_);
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<NonZeroU16>
is the same size as u16
:
use std::mem::size_of; assert_eq!(size_of::<Option<core::num::NonZeroU16>>(), size_of::<u16>());Run
Implementations
如果给定值不为零,则创建一个非零值。
返回大于或等于 n 的 2 的最小幂。
如果下一个 2 的幂大于类型的最大值,则检查是否溢出并返回 None
。
因此,结果不能归零。
Examples
#![feature(nonzero_ops)] let two = NonZeroU16::new(2)?; let three = NonZeroU16::new(3)?; let four = NonZeroU16::new(4)?; let max = NonZeroU16::new(u16::MAX)?; assert_eq!(Some(two), two.checked_next_power_of_two() ); assert_eq!(Some(four), three.checked_next_power_of_two() ); assert_eq!(None, max.checked_next_power_of_two() );Run
当且仅当某些 k
的 self == (1 << k)
时,才返回 true
。
在许多体系结构上,此函数可以在基础整数类型上比 is_power_of_two()
更好地执行,因为可以避免对零的特殊处理。
Examples
基本用法:
#![feature(nonzero_is_power_of_two)] let eight = std::num::NonZeroU16::new(8).unwrap(); assert!(eight.is_power_of_two()); let ten = std::num::NonZeroU16::new(10).unwrap(); assert!(!ten.is_power_of_two());Run
Trait Implementations
type Output = NonZeroU16
type Output = NonZeroU16
应用 |
运算符后的结果类型。
执行 |
操作。 Read more
type Output = NonZeroU16
type Output = NonZeroU16
应用 |
运算符后的结果类型。
执行 |
操作。 Read more
type Output = NonZeroU16
type Output = NonZeroU16
应用 |
运算符后的结果类型。
执行 |=
操作。 Read more
执行 |=
操作。 Read more
Converts a NonZeroU16
into an u16
Converts NonZeroU16
to NonZeroU128
losslessly.
Converts NonZeroU16
to NonZeroI64
losslessly.
Converts NonZeroU16
to NonZeroU64
losslessly.
Converts NonZeroU16
to NonZeroU32
losslessly.
Converts NonZeroU16
to NonZeroUsize
losslessly.
Converts NonZeroU16
to NonZeroI32
losslessly.
Converts NonZeroU16
to NonZeroI128
losslessly.
Converts NonZeroU8
to NonZeroU16
losslessly.
type Err = ParseIntError
type Err = ParseIntError
可以从解析中返回的相关错误。
解析字符串 s
以返回此类型的值。 Read more
此方法测试 self
和 other
值是否相等,并由 ==
使用。 Read more
此方法测试 !=
。
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI128>>::Error>
[src]
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI128>>::Error>
[src]Attempts to convert NonZeroI128
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: NonZeroI16
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI16>>::Error>
[src]
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI16>>::Error>
[src]Attempts to convert NonZeroI16
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: NonZeroI32
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI32>>::Error>
[src]
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI32>>::Error>
[src]Attempts to convert NonZeroI32
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: NonZeroI64
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI64>>::Error>
[src]
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI64>>::Error>
[src]Attempts to convert NonZeroI64
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<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI8>>::Error>
[src]
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI8>>::Error>
[src]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: NonZeroIsize
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroIsize>>::Error>
[src]
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroIsize>>::Error>
[src]Attempts to convert NonZeroIsize
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: NonZeroU128
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroU128>>::Error>
[src]
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroU128>>::Error>
[src]Attempts to convert NonZeroU128
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: 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
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>
[src]
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU16>>::Error>
[src]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: NonZeroU16
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroU16>>::Error>
[src]
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroU16>>::Error>
[src]Attempts to convert NonZeroU16
to NonZeroI16
.
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<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroU16>>::Error>
[src]
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroU16>>::Error>
[src]Attempts to convert NonZeroU16
to NonZeroIsize
.
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<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroU32>>::Error>
[src]
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroU32>>::Error>
[src]Attempts to convert NonZeroU32
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: NonZeroU64
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroU64>>::Error>
[src]
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroU64>>::Error>
[src]Attempts to convert NonZeroU64
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: NonZeroUsize
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroUsize>>::Error>
[src]
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroUsize>>::Error>
[src]Attempts to convert NonZeroUsize
to NonZeroU16
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。
Attempts to convert u16
to NonZeroU16
.
type Error = TryFromIntError
type Error = TryFromIntError
发生转换错误时返回的类型。