Trait core::fmt::UpperHex

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

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 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 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;

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

let l = Length(9);

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

Required methods

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

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Implementors

impl UpperHex for NonZeroI128

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for NonZeroI16

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for NonZeroI32

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for NonZeroI64

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for NonZeroI8

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for NonZeroIsize

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for NonZeroU128

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for NonZeroU16

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for NonZeroU32

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for NonZeroU64

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for NonZeroU8

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for NonZeroUsize

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for i8

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for i16

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for i32

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for i64

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for i128

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for isize

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for u8

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for u16

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for u32

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for u64

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for u128

fn fmt(&self, f: &mut Formatter) -> Result

impl UpperHex for usize

fn fmt(&self, f: &mut Formatter) -> Result

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

fn fmt(&self, f: &mut Formatter) -> Result

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

fn fmt(&self, f: &mut Formatter) -> Result

impl<T: UpperHex> UpperHex for Wrapping<T>

fn fmt(&self, f: &mut Formatter) -> Result

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