Trait core::fmt::Octal [−] [src]

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

Format trait for the o character.

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

The alternate flag, #, adds a 0o in front of the output.

For more information on formatters, see the module-level documentation.

Examples

Basic usage with i32:

fn main() { let x = 42; // 42 is '52' in octal assert_eq!(format!("{:o}", x), "52"); assert_eq!(format!("{:#o}", x), "0o52"); }
let x = 42; // 42 is '52' in octal

assert_eq!(format!("{:o}", x), "52");
assert_eq!(format!("{:#o}", x), "0o52");

Implementing Octal on a type:

fn main() { 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) // delegate to i32's implementation } } let l = Length(9); println!("l as octal is: {:o}", l); }
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) // delegate to i32's implementation
    }
}

let l = Length(9);

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

Required Methods

fn fmt(&self, &mut Formatter) -> Result

Formats the value using the given formatter.

Implementors