Trait std::fmt::UpperHex
[−]
[src]
pub trait UpperHex { fn fmt(&self, &mut Formatter) -> Result<(), Error>; }
Format trait for the X
character.
The UpperHex
trait should format its output as a number in hexadecimal, with A
through F
in upper case.
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");
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
Implementors
impl UpperHex for isize
impl UpperHex for usize
impl UpperHex for i8
impl UpperHex for u8
impl UpperHex for i16
impl UpperHex for u16
impl UpperHex for i32
impl UpperHex for u32
impl UpperHex for i64
impl UpperHex for u64
impl<'a, T> UpperHex for &'a T where T: UpperHex + ?Sized
impl<'a, T> UpperHex for &'a mut T where T: UpperHex + ?Sized