Trait core::fmt::LowerHex 1.0.0
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pub trait LowerHex {
fn fmt(&self, f: &mut Formatter) -> Result;
}Format trait for the x character.
The LowerHex trait should format its output as a number in hexadecimal, with a through f
in lower 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");Run
Implementing LowerHex on a type:
use std::fmt; struct Length(i32); impl fmt::LowerHex 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);Run
Required Methods
Implementors
impl<T: LowerHex> LowerHex for Wrapping<T>impl LowerHex for isizeimpl LowerHex for usizeimpl LowerHex for i8impl LowerHex for u8impl LowerHex for i16impl LowerHex for u16impl LowerHex for i32impl LowerHex for u32impl LowerHex for i64impl LowerHex for u64impl LowerHex for i128impl LowerHex for u128impl<'a, T: ?Sized + LowerHex> LowerHex for &'a Timpl<'a, T: ?Sized + LowerHex> LowerHex for &'a mut T