# Trait alloc::fmt::Display

1.0.0 · source · [−]

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

Expand description

Format trait for an empty format, `{}`.

Implementing this trait for a type will automatically implement the `ToString` trait for the type, allowing the usage of the `.to_string()` method. Prefer implementing the `Display` trait for a type, rather than `ToString`.

`Display` is similar to `Debug`, but `Display` is for user-facing output, and so cannot be derived.

For more information on formatters, see the module-level documentation.

## Examples

Implementing `Display` on a type:

    use std::fmt;

    struct Point {
        x: i32,
        y: i32,
    }

    impl fmt::Display for Point {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            write!(f, "({}, {})", self.x, self.y)
        }
    }

    let origin = Point { x: 0, y: 0 };

    assert_eq!(format!("The origin is: {origin}"), "The origin is: (0, 0)");

Run

## Required Methods

source

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

Formats the value using the given formatter.

##### Examples

    use std::fmt;

    struct Position {
        longitude: f32,
        latitude: f32,
    }

    impl fmt::Display for Position {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            write!(f, "({}, {})", self.longitude, self.latitude)
        }
    }

    assert_eq!("(1.987, 2.983)",
               format!("{}", Position { longitude: 1.987, latitude: 2.983, }));

Run

## Implementors

1.34.0 · source

### impl Display for Infallible

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### impl Display for bool

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### impl Display for char

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### impl Display for f32

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### impl Display for f64

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### impl Display for i8

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### impl Display for i16

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### impl Display for i32

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### impl Display for i64

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### impl Display for i128

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### impl Display for isize

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### impl Display for !

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### impl Display for str

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### impl Display for u8

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### impl Display for u16

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### impl Display for u32

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### impl Display for u64

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### impl Display for u128

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### impl Display for usize

1.36.0 · source

### impl Display for TryFromSliceError

1.39.0 · source

### impl Display for core::ascii::EscapeDefault

1.13.0 · source

### impl Display for BorrowError

1.13.0 · source

### impl Display for BorrowMutError

1.34.0 · source

### impl Display for CharTryFromError

1.20.0 · source

### impl Display for ParseCharError

1.9.0 · source

### impl Display for DecodeUtf16Error

1.20.0 · source

### impl Display for core::char::EscapeDebug

1.16.0 · source

### impl Display for core::char::EscapeDefault

1.16.0 · source

### impl Display for core::char::EscapeUnicode

1.16.0 · source

### impl Display for ToLowercase

1.16.0 · source

### impl Display for ToUppercase

1.59.0 · source

### impl Display for TryFromCharError

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### impl Display for FromBytesUntilNulError

1.17.0 · source

### impl Display for FromBytesWithNulError

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### impl Display for ParseFloatError

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### impl Display for ParseIntError

1.34.0 · source

### impl Display for TryFromIntError

1.34.0 · source

### impl Display for NonZeroI8

1.34.0 · source

### impl Display for NonZeroI16

1.34.0 · source

### impl Display for NonZeroI32

1.34.0 · source

### impl Display for NonZeroI64

1.34.0 · source

### impl Display for NonZeroI128

1.34.0 · source

### impl Display for NonZeroIsize

1.28.0 · source

### impl Display for NonZeroU8

1.28.0 · source

### impl Display for NonZeroU16

1.28.0 · source

### impl Display for NonZeroU32

1.28.0 · source

### impl Display for NonZeroU64

1.28.0 · source

### impl Display for NonZeroU128

1.28.0 · source

### impl Display for NonZeroUsize

1.26.0 · source

### impl Display for Location<'_>

1.26.0 · source

### impl Display for PanicInfo<'_>

1.66.0 · source

### impl Display for TryFromFloatSecsError

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### impl Display for AllocError

1.28.0 · source

### impl Display for LayoutError

1.57.0 · source

### impl Display for TryReserveError

1.58.0 · source

### impl Display for FromVecWithNulError

1.7.0 · source

### impl Display for IntoStringError

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### impl Display for NulError

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### impl Display for ParseBoolError

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### impl Display for Utf8Error

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### impl Display for FromUtf8Error

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### impl Display for FromUtf16Error

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### impl Display for String

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### impl Display for Arguments<'_>

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### impl Display for Error

1.60.0 · source

### impl<'a> Display for EscapeAscii<'a>

1.34.0 · source

### impl<'a> Display for alloc::str::EscapeDebug<'a>

1.34.0 · source

### impl<'a> Display for alloc::str::EscapeDefault<'a>

1.34.0 · source

### impl<'a> Display for alloc::str::EscapeUnicode<'a>

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### impl<'a, K: Debug + Ord, V: Debug, A: Allocator + Clone> Display for OccupiedError<'a, K, V, A>

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### impl<B: ?Sized> Display for Cow<'_, B>where
B: Display + ToOwned<Owned: Display>,

1.33.0 · source

### impl<P> Display for Pin<P>where
P: Display,

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### impl<T> Display for &Twhere
T: Display + ?Sized,

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### impl<T> Display for &mut Twhere
T: Display + ?Sized,

1.20.0 · source

### impl<T> Display for Ref<'_, T>where
T: Display + ?Sized,

1.20.0 · source

### impl<T> Display for RefMut<'_, T>where
T: Display + ?Sized,

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### impl<T> Display for Saturating<T>where
T: Display,

1.10.0 · source

### impl<T> Display for Wrapping<T>where
T: Display,

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### impl<T: Display + ?Sized, A: Allocator> Display for Box<T, A>

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### impl<T: ?Sized + Display> Display for ThinBox<T>

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### impl<T: ?Sized + Display> Display for Rc<T>

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### impl<T: ?Sized + Display> Display for Arc<T>