Trait core::fmt::Display

1.0.0 · source ·
pub trait Display {
    // Required method
    fn fmt(&self, f: &mut Formatter<'_>) -> Result;
}
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)");
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Required Methods§

source

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

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, }));
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impl Display for AsciiChar

1.34.0 · source§

impl Display for Infallible

1.7.0 · source§

impl Display for IpAddr

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impl Display for SocketAddr

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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

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impl Display for AllocError

1.28.0 · source§

impl Display for LayoutError

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

1.9.0 · 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

1.20.0 · source§

impl Display for ParseCharError

1.16.0 · source§

impl Display for ToLowercase

1.16.0 · source§

impl Display for ToUppercase

1.59.0 · source§

impl Display for TryFromCharError

1.69.0 · source§

impl Display for FromBytesUntilNulError

1.17.0 · source§

impl Display for FromBytesWithNulError

1.4.0 · source§

impl Display for AddrParseError

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impl Display for Ipv4Addr

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impl Display for Ipv6Addr

Write an Ipv6Addr, conforming to the canonical style described by RFC 5952.

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impl Display for SocketAddrV4

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impl Display for SocketAddrV6

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impl Display for ParseFloatError

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impl Display for ParseIntError

1.34.0 · source§

impl Display for TryFromIntError

1.26.0 · source§

impl Display for Location<'_>

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impl Display for PanicInfo<'_>

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impl Display for ParseBoolError

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impl Display for Utf8Error

1.66.0 · source§

impl Display for TryFromFloatSecsError

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impl Display for Arguments<'_>

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impl Display for Error

1.34.0 · source§

impl Display for NonZeroI8

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impl Display for NonZeroI16

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impl Display for NonZeroI32

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impl Display for NonZeroI64

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impl Display for NonZeroI128

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impl Display for NonZeroIsize

1.28.0 · source§

impl Display for NonZeroU8

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impl Display for NonZeroU16

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impl Display for NonZeroU32

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impl Display for NonZeroU64

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impl Display for NonZeroU128

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impl Display for NonZeroUsize

1.60.0 · source§

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

1.34.0 · source§

impl<'a> Display for core::str::EscapeDebug<'a>

1.34.0 · source§

impl<'a> Display for core::str::EscapeDefault<'a>

1.34.0 · source§

impl<'a> Display for core::str::EscapeUnicode<'a>

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impl<F> Display for FormatterFn<F>
where F: Fn(&mut Formatter<'_>) -> Result,

1.33.0 · source§

impl<Ptr: Display> Display for Pin<Ptr>

1.74.0 · source§

impl<T: Display> Display for Saturating<T>

1.10.0 · source§

impl<T: Display> Display for Wrapping<T>

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impl<T: ?Sized + Display> Display for &T

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

1.20.0 · source§

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

1.20.0 · source§

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

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impl<const N: usize> Display for GetManyMutError<N>