Trait std::fmt::Octal
pub trait Octal {
// Required method
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!("{x:o}"), "52");
assert_eq!(format!("{x:#o}"), "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: {l:o}"), "l as octal is: 11");
assert_eq!(format!("l as octal is: {l:#06o}"), "l as octal is: 0o0011");Required Methods
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>Formats the value using the given formatter.
Implementors
impl Octal for i8impl Octal for i16impl Octal for i32impl Octal for i64impl Octal for i128impl Octal for isizeimpl Octal for u8impl Octal for u16impl Octal for u32impl Octal for u64impl Octal for u128impl Octal for usizeimpl Octal for NonZeroI8impl Octal for NonZeroI16impl Octal for NonZeroI32impl Octal for NonZeroI64impl Octal for NonZeroI128impl Octal for NonZeroIsizeimpl Octal for NonZeroU8impl Octal for NonZeroU16impl Octal for NonZeroU32impl Octal for NonZeroU64impl Octal for NonZeroU128impl Octal for NonZeroUsizeimpl<T> Octal for &T
where
T: Octal + ?Sized,impl<T> Octal for &mut T
where
T: Octal + ?Sized,impl<T> Octal for Saturating<T>
where
T: Octal,impl<T> Octal for Wrapping<T>
where
T: Octal,© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/fmt/trait.Octal.html