collections::fmt::Octal

Trait collections::fmt::Octal

pub trait Octal {
    fn fmt(&self, f: &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);

Required Methods

Implementors

• impl<T> Octal for Wrapping<T> where
    T: Octal, 
• impl Octal for isize
• impl Octal for usize
• impl Octal for i8
• impl Octal for u8
• impl Octal for i16
• impl Octal for u16
• impl Octal for i32
• impl Octal for u32
• impl Octal for i64
• impl Octal for u64
• impl Octal for i128
• impl Octal for u128
• impl<'a, T> Octal for &'a T where
    T: Octal + ?Sized, 
• impl<'a, T> Octal for &'a mut T where
    T: Octal + ?Sized,