Trait core::fmt::UpperHex1.0.0[][src]

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");
Run

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: {:X}", l), "l as hex is: 7FFFFFFF");

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

Required methods

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

Formats the value using the given formatter.

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Implementors

impl UpperHex for NonZeroI81.34.0[src]

impl UpperHex for NonZeroI161.34.0[src]

impl UpperHex for NonZeroI321.34.0[src]

impl UpperHex for NonZeroI641.34.0[src]

impl UpperHex for NonZeroI1281.34.0[src]

impl UpperHex for NonZeroIsize1.34.0[src]

impl UpperHex for NonZeroU81.28.0[src]

impl UpperHex for NonZeroU161.28.0[src]

impl UpperHex for NonZeroU321.28.0[src]

impl UpperHex for NonZeroU641.28.0[src]

impl UpperHex for NonZeroU1281.28.0[src]

impl UpperHex for NonZeroUsize1.28.0[src]

impl UpperHex for i8[src]

impl UpperHex for i16[src]

impl UpperHex for i32[src]

impl UpperHex for i64[src]

impl UpperHex for i128[src]

impl UpperHex for isize[src]

impl UpperHex for u8[src]

impl UpperHex for u16[src]

impl UpperHex for u32[src]

impl UpperHex for u64[src]

impl UpperHex for u128[src]

impl UpperHex for usize[src]

impl<T: UpperHex> UpperHex for Wrapping<T>1.11.0[src]

impl<T: ?Sized + UpperHex> UpperHex for &T[src]

impl<T: ?Sized + UpperHex> UpperHex for &mut T[src]

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