Trait alloc::fmt::Octal

1.0.0 · source ·
pub trait Octal {
    // Required method
    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>;
}
Expand description

o 格式。

Octal trait 应该将其输出格式化为 base-8 中的数字。

对于原始有符号整数 (i8i128isize),负值的格式设置为二进制补码表示形式。

备用标志 # 在输出前面添加 0o

有关格式化程序的更多信息,请参见 模块级文档

Examples

i32 的基本用法:

let x = 42; // 42 是八进制的 '52'

assert_eq!(format!("{x:o}"), "52");
assert_eq!(format!("{x:#o}"), "0o52");

assert_eq!(format!("{:o}", -16), "37777777760");
Run

在类型上实现 Octal

use std::fmt;

struct Length(i32);

impl fmt::Octal for Length {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let val = self.0;

        fmt::Octal::fmt(&val, f) // 委托给 i32 的实现
    }
}

let l = Length(9);

assert_eq!(format!("l as octal is: {l:o}"), "l as octal is: 11");

assert_eq!(format!("l as octal is: {l:#06o}"), "l as octal is: 0o0011");
Run

Required Methods§

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

使用给定的格式化程序格式化该值。

Implementors§

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impl Octal for i8

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impl Octal for i16

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impl Octal for i32

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impl Octal for i64

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impl Octal for i128

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impl Octal for isize

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impl Octal for u8

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impl Octal for u16

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impl Octal for u32

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impl Octal for u64

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impl Octal for u128

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impl Octal for usize

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impl Octal for NonZeroI8

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impl Octal for NonZeroI16

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impl Octal for NonZeroI32

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impl Octal for NonZeroI64

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impl Octal for NonZeroI128

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impl Octal for NonZeroIsize

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impl Octal for NonZeroU8

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impl Octal for NonZeroU16

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impl Octal for NonZeroU32

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impl Octal for NonZeroU64

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impl Octal for NonZeroU128

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impl Octal for NonZeroUsize

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impl<T> Octal for &Twhere T: Octal + ?Sized,

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impl<T> Octal for &mut Twhere T: Octal + ?Sized,

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impl<T> Octal for Saturating<T>where T: Octal,

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impl<T> Octal for Wrapping<T>where T: Octal,