Trait alloc::fmt::UpperHex1.0.0[−][src]

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

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

Formats the value using the given formatter.

Implementations on Foreign Types

impl UpperHex for NonZeroU128
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impl UpperHex for NonZeroUsize
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impl<T> UpperHex for Wrapping<T> where
    T: UpperHex, 
[src]

impl UpperHex for NonZeroU32
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impl UpperHex for NonZeroU8
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impl UpperHex for NonZeroU64
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impl UpperHex for NonZeroU16
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Implementors