Trait alloc::fmt::Binary

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

b 格式。

Binary trait 应该将其输出格式化为二进制格式的数字。

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 0b

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 '101010' 二进制

assert_eq!(format!("{x:b}"), "101010");
assert_eq!(format!("{x:#b}"), "0b101010");

assert_eq!(format!("{:b}", -16), "11111111111111111111111111110000");
Run

在类型上实现 Binary

use std::fmt;

struct Length(i32);

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

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

let l = Length(107);

assert_eq!(format!("l as binary is: {l:b}"), "l as binary is: 1101011");

assert_eq!(
    format!("l as binary is: {l:#032b}"),
    "l as binary is: 0b000000000000000000000001101011"
);
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 Binary for i8

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impl Binary for i16

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impl Binary for i32

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impl Binary for i64

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impl Binary for i128

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impl Binary for isize

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impl Binary for u8

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impl Binary for u16

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impl Binary for u32

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impl Binary for u64

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impl Binary for u128

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impl Binary for usize

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impl Binary for NonZeroI8

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impl Binary for NonZeroI16

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impl Binary for NonZeroI32

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impl Binary for NonZeroI64

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impl Binary for NonZeroI128

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impl Binary for NonZeroIsize

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impl Binary for NonZeroU8

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impl Binary for NonZeroU16

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impl Binary for NonZeroU32

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impl Binary for NonZeroU64

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impl Binary for NonZeroU128

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impl Binary for NonZeroUsize

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

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

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

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