1.0.0[][src]Trait std::fmt::LowerHex

pub trait LowerHex {
    fn fmt(&self, f: &mut Formatter) -> Result<(), Error>;
}

x formatting.

The LowerHex trait should format its output as a number in hexadecimal, with a through f in lower case.

For primitive signed integers (i8 to i128, and isize), negative values are formatted as the two’s complement representation.

The alternate flag, #, adds a 0x in front of the output.

For more information on formatters, see the module-level documentation.

Examples

Basic usage with i32:

let x = 42; // 42 is '2a' in hex

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

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

Implementing LowerHex on a type:

use std::fmt;

struct Length(i32);

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

        write!(f, "{:x}", val) // delegate to i32's implementation
    }
}

let l = Length(9);

println!("l as hex is: {:x}", l);Run

Required Methods

Formats the value using the given formatter.

Implementors

impl LowerHex for i128
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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 i8
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impl LowerHex for isize
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impl LowerHex for u128
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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 u8
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impl LowerHex for usize
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impl LowerHex for NonZeroU128
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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 NonZeroU8
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impl LowerHex for NonZeroUsize
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impl<'_, T> LowerHex for &'_ T where
    T: LowerHex + ?Sized
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impl<'_, T> LowerHex for &'_ mut T where
    T: LowerHex + ?Sized
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impl<T> LowerHex for Wrapping<T> where
    T: LowerHex
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