Trait tor_hsservice::internal_prelude::fmt::UpperHex

1.0.0 · source ·

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

Expand description

X formatting.

The UpperHex trait should format its output as a number in hexadecimal, with A through F in upper 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 UpperHex on a type:

use std::fmt;

struct Length(i32);

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

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

let l = Length(i32::MAX);

assert_eq!(format!("l as hex is: {l:X}"), "l as hex is: 7FFFFFFF");

assert_eq!(format!("l as hex is: {l:#010X}"), "l as hex is: 0x7FFFFFFF");

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§

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impl UpperHex for i8

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impl UpperHex for i16

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impl UpperHex for i32

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impl UpperHex for i64

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impl UpperHex for i128

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impl UpperHex for isize

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impl UpperHex for u8

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impl UpperHex for u16

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impl UpperHex for u32

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impl UpperHex for u64

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impl UpperHex for u128

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

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

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

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

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

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

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

1.0.0 · source§

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

1.0.0 · source§

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

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

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

1.28.0 · source§

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

1.74.0 · source§

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

1.11.0 · source§