Trait frame_support::dispatch::fmt::LowerHex

[+] Show declaration

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

[−] Expand description

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.

Implementations on Foreign Types

impl LowerHex for NonZeroUsize[−]

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

impl LowerHex for u32[−]

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

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

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

impl LowerHex for i64[−]

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

impl LowerHex for isize[−]

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

impl LowerHex for i8[−]

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

impl LowerHex for i32[−]

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

impl LowerHex for u64[−]

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

impl<T> LowerHex for Wrapping<T> where
    T: LowerHex, [−]

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

impl LowerHex for NonZeroU128[−]

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

impl LowerHex for usize[−]

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

impl LowerHex for u8[−]

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

impl LowerHex for NonZeroI128[−]

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

impl LowerHex for NonZeroU64[−]

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

impl LowerHex for u16[−]

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

impl LowerHex for NonZeroI32[−]

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

impl LowerHex for i16[−]

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

impl LowerHex for NonZeroI64[−]

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

impl LowerHex for NonZeroU8[−]

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

impl LowerHex for NonZeroI8[−]

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

impl LowerHex for i128[−]

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

impl LowerHex for NonZeroU32[−]

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

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

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

impl LowerHex for NonZeroI16[−]

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

impl LowerHex for NonZeroIsize[−]

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

impl LowerHex for u128[−]

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

impl LowerHex for NonZeroU16[−]

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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>, [−]

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

impl LowerHex for BigUint[−]

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

impl LowerHex for BigInt[−]

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

impl LowerHex for H512[−]

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

impl LowerHex for U256[−]

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

impl LowerHex for U128[−]

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

impl LowerHex for U512[−]

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

impl LowerHex for H256[−]

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

impl LowerHex for H160[−]

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

impl LowerHex for Seed[−]

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

impl LowerHex for Mnemonic[−]

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

impl LowerHex for Scalar[−]

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

impl LowerHex for SecretKey[−]

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

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

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

Implementors

impl LowerHex for Mnemonic

impl LowerHex for Seed

impl<O, T> LowerHex for BitSlice<O, T> where     O: BitOrder,     T: BitStore,

impl<O, T> LowerHex for BitBox<O, T> where     O: BitOrder,     T: BitStore,

impl<O, T> LowerHex for BitVec<O, T> where     O: BitOrder,     T: BitStore,

impl LowerHex for Bloom

impl LowerHex for H32

impl LowerHex for H64

impl LowerHex for H128

impl LowerHex for H264

impl LowerHex for H520

impl LowerHex for U64

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

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

impl LowerHex for BigInt

impl LowerHex for BigUint

impl LowerHex for U128

impl LowerHex for U256

impl LowerHex for U512

impl LowerHex for H160

impl LowerHex for H256

impl LowerHex for H512

impl LowerHex for Scalar

impl LowerHex for SecretKey