Trait core::fmt::Octal1.0.0[][src]

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

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; // 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;

        fmt::Octal::fmt(&val, f) // delegate to i32's implementation

let l = Length(9);

assert_eq!(format!("l as octal is: {:o}", l), "l as octal is: 11");

assert_eq!(format!("l as octal is: {:#06o}", l), "l as octal is: 0o0011");

Required methods

fn fmt(&self, f: &mut Formatter<'_>) -> Result[src]

Formats the value using the given formatter.

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impl Octal for NonZeroI81.34.0[src]

impl Octal for NonZeroI161.34.0[src]

impl Octal for NonZeroI321.34.0[src]

impl Octal for NonZeroI641.34.0[src]

impl Octal for NonZeroI1281.34.0[src]

impl Octal for NonZeroIsize1.34.0[src]

impl Octal for NonZeroU81.28.0[src]

impl Octal for NonZeroU161.28.0[src]

impl Octal for NonZeroU321.28.0[src]

impl Octal for NonZeroU641.28.0[src]

impl Octal for NonZeroU1281.28.0[src]

impl Octal for NonZeroUsize1.28.0[src]

impl Octal for i8[src]

impl Octal for i16[src]

impl Octal for i32[src]

impl Octal for i64[src]

impl Octal for i128[src]

impl Octal for isize[src]

impl Octal for u8[src]

impl Octal for u16[src]

impl Octal for u32[src]

impl Octal for u64[src]

impl Octal for u128[src]

impl Octal for usize[src]

impl<T: Octal> Octal for Wrapping<T>1.11.0[src]

impl<T: ?Sized + Octal> Octal for &T[src]

impl<T: ?Sized + Octal> Octal for &mut T[src]

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