Trait alloc::fmt::LowerHex

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

x 格式。

LowerHex trait 应该将其输出格式设置为十六进制数字,其中 af 为小写形式。

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 0x

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 是十六进制的 '2a'

assert_eq!(format!("{x:x}"), "2a");
assert_eq!(format!("{x:#x}"), "0x2a");

assert_eq!(format!("{:x}", -16), "fffffff0");
Run

在类型上实现 LowerHex

use std::fmt;

struct Length(i32);

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

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

let l = Length(9);

assert_eq!(format!("l as hex is: {l:x}"), "l as hex is: 9");

assert_eq!(format!("l as hex is: {l:#010x}"), "l as hex is: 0x00000009");
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 LowerHex for i8

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impl LowerHex for i16

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impl LowerHex for i32

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impl LowerHex for i64

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impl LowerHex for i128

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impl LowerHex for isize

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impl LowerHex for u8

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impl LowerHex for u16

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impl LowerHex for u32

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impl LowerHex for u64

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impl LowerHex for u128

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impl LowerHex for usize

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impl LowerHex for NonZeroI8

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impl LowerHex for NonZeroI16

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impl LowerHex for NonZeroI32

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impl LowerHex for NonZeroI64

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impl LowerHex for NonZeroI128

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impl LowerHex for NonZeroIsize

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impl LowerHex for NonZeroU8

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impl LowerHex for NonZeroU16

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impl LowerHex for NonZeroU32

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impl LowerHex for NonZeroU64

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impl LowerHex for NonZeroU128

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impl LowerHex for NonZeroUsize

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

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

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

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