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

Trait std::fmt::Binary1.0.0 [−] [src]

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

b formatting.

The Binary trait should format its output as a number in binary.

For primitive signed integers (i8 to i128, and isize), negative values are formatted as the two’s complement representation.

The alternate flag, #, adds a 0b 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!("{:b}", x), "101010"); assert_eq!(format!("{:#b}", x), "0b101010");

assert_eq!(format!("{:b}", -16), "11111111111111111111111111110000");Run

Implementing Binary on a type:

use std::fmt;

struct Length(i32);

impl fmt::Binary for Length { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { let val = self.0;

    write!(f, "{:b}", val) 
}

}

let l = Length(107);

println!("l as binary is: {:b}", l);Run