Trait alloc::fmt::Octal

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.

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");

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

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

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

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Implementations on Foreign Types

impl Octal for NonZeroU128

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for NonZeroU8

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for NonZeroI64

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for NonZeroI8

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for NonZeroI128

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for NonZeroUsize

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl<T> Octal for Wrapping<T> where
    T: Octal, 

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for NonZeroU32

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for NonZeroI32

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for NonZeroIsize

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for NonZeroU16

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for NonZeroI16

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for NonZeroU64

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

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Implementors

impl Octal for i8

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for i16

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for i32

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for i64

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for i128

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for isize

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for u8

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for u16

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for u32

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for u64

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for u128

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl Octal for usize

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl<'_, T> Octal for &'_ T where
    T: Octal + ?Sized, 

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

impl<'_, T> Octal for &'_ mut T where
    T: Octal + ?Sized, 

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

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