Trait std::fmt::Octal
[−]
[src]
pub trait Octal { fn fmt(&self, &mut Formatter) -> Result<(), Error>; }
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
:
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:
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);