Trait alloc::fmt::Display

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

Format trait for an empty format, {}.

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 };

println!("The origin is: {}", origin);

Required methods

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

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Implementations on Foreign Types

impl Display for EscapeDefault

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

impl Display for EscapeDefault

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

impl Display for NonZeroU128

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

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

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

impl Display for NonZeroU8

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

impl Display for ParseCharError

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

impl Display for ToLowercase

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

impl Display for DecodeUtf16Error

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

impl Display for ParseIntError

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

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

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

impl Display for NonZeroI64

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

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

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

impl Display for NonZeroI32

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

impl Display for TryFromSliceError

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

impl Display for TryFromIntError

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

impl Display for NonZeroI128

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

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

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

impl Display for NonZeroIsize

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

impl Display for EscapeUnicode

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

impl Display for ToUppercase

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

impl Display for NonZeroUsize

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

impl Display for NonZeroI8

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

impl Display for CharTryFromError

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

impl Display for NonZeroU32

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

impl Display for Utf8Lossy

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

impl Display for BorrowError

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

impl Display for EscapeDebug

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

impl Display for NonZeroI16

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

impl Display for Infallible

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

impl<'_> Display for Location<'_>

fn fmt(&self, formatter: &mut Formatter) -> Result<(), Error>

impl<'_> Display for PanicInfo<'_>

fn fmt(&self, formatter: &mut Formatter) -> Result<(), Error>

impl Display for NonZeroU64

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

impl Display for NonZeroU16

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

impl Display for ParseFloatError

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

impl Display for BorrowMutError

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

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Implementors

impl Display for !

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

impl Display for AllocErr

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

impl Display for CannotReallocInPlace

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

impl Display for LayoutErr

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

impl Display for Error

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

impl Display for ParseBoolError

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

impl Display for Utf8Error

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

impl Display for FromUtf16Error

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

impl Display for FromUtf8Error

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

impl Display for String

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

impl Display for bool

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

impl Display for char

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

impl Display for f32

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

impl Display for f64

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

impl Display for i8

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

impl Display for i16

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

impl Display for i32

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

impl Display for i64

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

impl Display for i128

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

impl Display for isize

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

impl Display for str

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

impl Display for u8

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

impl Display for u16

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

impl Display for u32

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

impl Display for u64

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

impl Display for u128

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

impl Display for usize

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

impl<'_> Display for Arguments<'_>

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

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

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

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

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

impl<'_, T> Display for &'_ mut T where
    T: Display + ?Sized, 

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

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

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

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

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

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

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

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

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

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

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

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

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

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