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

# Trait std::fmt::Binary 1.0.0 [−] [src]

    pub trait Binary {
        fn fmt(&self, &mut Formatter) -> Result<(), Error>;
    }

Format trait for the `b` character.

The `Binary` trait should format its output as a number in binary.

The alternate flag, `#`, adds a `0b` 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 '101010' in binary

    assert_eq!(format!("{:b}", x), "101010");
    assert_eq!(format!("{:#b}", x), "0b101010");Run

Implementing `Binary` on a type:

    use std::fmt;

    struct Length(i32);

    impl fmt::Binary for Length {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            let val = self.0;

            write!(f, "{:b}", val) // delegate to i32's implementation
        }
    }

    let l = Length(107);

    println!("l as binary is: {:b}", l);Run

## Required Methods

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

Formats the value using the given formatter.

## Implementors

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

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