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)");
Run

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, }));
Run

Implementors§

source§

impl Display for AsciiChar

1.34.0 · source§

impl Display for Infallible

1.7.0 · source§

impl Display for IpAddr

source§

impl Display for SocketAddr

source§

impl Display for bool

source§

impl Display for char

source§

impl Display for f32

source§

impl Display for f64

source§

impl Display for i8

source§

impl Display for i16

source§

impl Display for i32

source§

impl Display for i64

source§

impl Display for i128

source§

impl Display for isize

source§

impl Display for !

source§

impl Display for str

source§

impl Display for u8

source§

impl Display for u16

source§

impl Display for u32

source§

impl Display for u64

source§

impl Display for u128

source§

impl Display for usize

source§

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

source§

impl Display for Ipv4Addr

source§

impl Display for Ipv6Addr

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

source§

impl Display for SocketAddrV4

source§

impl Display for SocketAddrV6

source§

impl Display for ParseFloatError

source§

impl Display for ParseIntError

1.34.0 · source§

impl Display for TryFromIntError

1.26.0 · source§

impl Display for Location<'_>

1.26.0 · source§

impl Display for PanicInfo<'_>

source§

impl Display for ParseBoolError

source§

impl Display for Utf8Error

1.66.0 · source§

impl Display for TryFromFloatSecsError

source§

impl Display for Arguments<'_>

source§

impl Display for Error

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>

source§

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

1.33.0 · source§

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

1.28.0 · source§

impl<T> Display for NonZero<T>

1.74.0 · source§

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

1.10.0 · source§

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

source§

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

source§

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>

source§

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