Trait frame_support::dispatch::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");

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;

        fmt::LowerHex::fmt(&val, f) // delegate to i32's implementation
    }
}

let l = Length(9);

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

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

Required methods

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

Formats the value using the given formatter.

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Implementations on Foreign Types

impl LowerHex for NonZeroUsize

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

impl LowerHex for u32

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

impl<'_, T> LowerHex for &'_ mut T where
    T: LowerHex + ?Sized, 

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

impl LowerHex for i64

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

impl LowerHex for isize

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

impl LowerHex for i8

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

impl LowerHex for i32

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

impl LowerHex for u64

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

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

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

impl LowerHex for NonZeroU128

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

impl LowerHex for usize

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

impl LowerHex for u8

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

impl LowerHex for NonZeroI128

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

impl LowerHex for NonZeroU64

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

impl LowerHex for u16

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

impl LowerHex for NonZeroI32

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

impl LowerHex for i16

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

impl LowerHex for NonZeroI64

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

impl LowerHex for NonZeroU8

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

impl LowerHex for NonZeroI8

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

impl LowerHex for i128

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

impl LowerHex for NonZeroU32

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

impl<'_, T> LowerHex for &'_ T where
    T: LowerHex + ?Sized, 

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

impl LowerHex for NonZeroI16

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

impl LowerHex for NonZeroIsize

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

impl LowerHex for u128

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

impl LowerHex for NonZeroU16

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

impl<T> LowerHex for GenericArray<u8, T> where
    T: ArrayLength<u8> + Add<T>,
    <T as Add<T>>::Output: ArrayLength<u8>, 

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

impl LowerHex for BigUint

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

impl LowerHex for BigInt

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

impl LowerHex for H512

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

impl LowerHex for U256

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

impl LowerHex for U128

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

impl LowerHex for U512

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

impl LowerHex for H256

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

impl LowerHex for H160

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

impl LowerHex for Seed

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

impl LowerHex for Mnemonic

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

impl LowerHex for Scalar

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

impl LowerHex for SecretKey

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

impl<'a, I> LowerHex for Format<'a, I> where
    I: Iterator,
    <I as Iterator>::Item: LowerHex, 

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

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Implementors

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