Trait alloc::fmt::LowerHex 1.0.0
[−]
[src]
pub trait LowerHex {
fn fmt(&self, f: &mut Formatter) -> Result<(), Error>;
}x formatting.
The LowerHex trait should format its output as a number in hexadecimal, with a through f
in lower 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 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);
Required Methods
Implementations on Foreign Types
impl<T> LowerHex for Wrapping<T> where
T: LowerHex, [src]
T: LowerHex,
Implementors
impl LowerHex for i128impl LowerHex for u8impl<'a, T> LowerHex for &'a mut T where
T: LowerHex + ?Sized,impl<'a, T> LowerHex for &'a T where
T: LowerHex + ?Sized,impl LowerHex for u16impl LowerHex for u128impl LowerHex for i64impl LowerHex for usizeimpl LowerHex for i32impl LowerHex for u32impl LowerHex for isizeimpl LowerHex for i8impl LowerHex for u64impl LowerHex for i16