Trait 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.

Errors

This function should return Err if, and only if, the provided Formatter returns Err. String formatting is considered an infallible operation; this function only returns a Result because writing to the underlying stream might fail and it must provide a way to propagate the fact that an error has occurred back up the stack.

Implementors

impl Octal for i8

impl Octal for i16

impl Octal for i32

impl Octal for i64

impl Octal for i128

impl Octal for isize

impl Octal for u8

impl Octal for u16

impl Octal for u32

impl Octal for u64

impl Octal for u128

impl Octal for usize

impl Octal for DrawFlags

impl Octal for DrawListFlags

impl Octal for BackendFlags

impl Octal for ButtonFlags

impl Octal for ColorEditFlags

impl Octal for ComboBoxFlags

impl Octal for ConfigFlags

impl Octal for DragDropFlags

impl Octal for FontAtlasFlags

impl Octal for InputTextCallback

impl Octal for InputTextFlags

impl Octal for InputTextMultilineCallback

impl Octal for ItemHoveredFlags

impl Octal for JoystickHats

impl Octal for Modifiers

impl Octal for SelectableFlags

impl Octal for SliderFlags

impl Octal for TabBarFlags

impl Octal for TabItemFlags

impl Octal for TreeNodeFlags

impl Octal for WindowFlags

impl Octal for WindowFocusedFlags

impl Octal for WindowHoveredFlags

impl Octal for bf16

Available on non-target_arch=spirv only.

impl Octal for f16

Available on non-target_arch=spirv only.

impl Octal for BigInt

impl Octal for BigUint

impl Octal for Transformations

impl<'a, I> Octal for Format<'a, I>

where I: Iterator, <I as Iterator>::Item: Octal,

impl<O> Octal for I16<O>

where O: ByteOrder,

impl<O> Octal for I32<O>

where O: ByteOrder,

impl<O> Octal for I64<O>

where O: ByteOrder,

impl<O> Octal for I128<O>

where O: ByteOrder,

impl<O> Octal for Isize<O>

where O: ByteOrder,

impl<O> Octal for U16<O>

where O: ByteOrder,

impl<O> Octal for U32<O>

where O: ByteOrder,

impl<O> Octal for U64<O>

where O: ByteOrder,

impl<O> Octal for U128<O>

where O: ByteOrder,

impl<O> Octal for Usize<O>

where O: ByteOrder,

impl<T> Octal for &T

where T: Octal + ?Sized,

impl<T> Octal for &mut T

where T: Octal + ?Sized,

impl<T> Octal for NonZero<T>

where T: ZeroablePrimitive + Octal,

impl<T> Octal for Saturating<T>

where T: Octal,

impl<T> Octal for Wrapping<T>

where T: Octal,

impl<T> Octal for Ratio<T>

where T: Octal + Clone + Integer,