std::fmt::LowerHex - Rust (original) (raw)

Trait std::fmt::LowerHex1.0.0 [−] [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 fin 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.

Basic usage with i32:

let x = 42;

assert_eq!(format!("{:x}", x), "2a"); assert_eq!(format!("{:#x}", x), "0x2a");

assert_eq!(format!("{:x}", -16), "fffffff0");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) 
}

}

let l = Length(9);

println!("l as hex is: {:x}", l);Run