Trait tor_hsservice::internal_prelude::fmt::LowerHex

1.0.0 · source ·

pub trait LowerHex {
    // Required method
    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 y = 42; // 42 is '2a' in hex

assert_eq!(format!("{y:x}"), "2a");
assert_eq!(format!("{y:#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: {l:x}"), "l as hex is: 9");

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

Required Methods§

1.0.0 · source

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

Formats the value using the given formatter.

§Errors

This function should return Err if, and only if, the provided Formatter returns Err. String formatting is considered an infallible operation; this function only returns a Result because writing to the underlying stream might fail and it must provide a way to propagate the fact that an error has occurred back up the stack.

Implementors§

1.0.0 · source§

impl LowerHex for i8

1.0.0 · source§

impl LowerHex for i16

1.0.0 · source§

impl LowerHex for i32

1.0.0 · source§

impl LowerHex for i64

1.0.0 · source§

impl LowerHex for i128

1.0.0 · source§

impl LowerHex for isize

1.0.0 · source§

impl LowerHex for u8

1.0.0 · source§

impl LowerHex for u16

1.0.0 · source§

impl LowerHex for u32

1.0.0 · source§

impl LowerHex for u64

1.0.0 · source§

impl LowerHex for u128

1.0.0 · source§

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

§

impl<'a, T, O> LowerHex for Domain<'a, Const, T, O>
where O: BitOrder, T: BitStore,

§

impl<'s, T> LowerHex for SliceVec<'s, T>
where T: LowerHex,

§

impl<A> LowerHex for ArrayVec<A>
where A: Array, <A as Array>::Item: LowerHex,

§

impl<A> LowerHex for TinyVec<A>
where A: Array, <A as Array>::Item: LowerHex,

§

impl<A, O> LowerHex for BitArray<A, O>
where O: BitOrder, A: BitViewSized,

§

impl<Size> LowerHex for EncodedPoint<Size>
where Size: ModulusSize,

1.0.0 · source§

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

1.0.0 · source§

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

source §

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

source §

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

1.28.0 · source§

impl<T> LowerHex for NonZero<T>
where T: ZeroablePrimitive + LowerHex,

1.74.0 · source§

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

1.11.0 · source§