Trait std::fmt::Binary

二进制 b 格式。

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

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 (i8 至 i128 和 isize)，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。

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");

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"
);

Required Methods

fmt

使用给定的格式化程序格式化该值。

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

Implementors

impl Binary for i8

impl Binary for i16

impl Binary for i32

impl Binary for i64

impl Binary for i128

impl Binary for isize

impl Binary for u8

impl Binary for u16

impl Binary for u32

impl Binary for u64

impl Binary for u128

impl Binary for usize

impl Binary for NonZeroI8

impl Binary for NonZeroI16

impl Binary for NonZeroI32

impl Binary for NonZeroI64

impl Binary for NonZeroI128

impl Binary for NonZeroIsize

impl Binary for NonZeroU8

impl Binary for NonZeroU16

impl Binary for NonZeroU32

impl Binary for NonZeroU64

impl Binary for NonZeroU128

impl Binary for NonZeroUsize

impl<T> Binary for &T

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

impl<T> Binary for &mut T

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

impl<T> Binary for Saturating<T>

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

impl<T> Binary for Wrapping<T>

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