alloc::fmt::Octal - Rust
Description: API documentation for the Rust `Octal` trait in crate `alloc`.
Keywords: rust, rustlang, rust-lang, Octal

# Trait alloc::fmt::Octal 1.0.0 [−] [src]

    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

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

Formats the value using the given formatter.

## Implementors

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

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