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

Trait std::fmt::Octal1.0.0 [−] [src]

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

o formatting.

The Octal trait should format its output as a number in base-8.

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

The alternate flag, #, adds a 0o 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!("{:o}", x), "52"); assert_eq!(format!("{:#o}", x), "0o52");

assert_eq!(format!("{:o}", -16), "37777777760");Run

Implementing Octal on a type:

use std::fmt;

struct Length(i32);

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

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

}

let l = Length(9);

println!("l as octal is: {:o}", l);Run