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, }));

Implementations on Foreign Types

impl Display for AllocErr

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

impl Display for NonZeroU64

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

impl Display for CannotReallocInPlace

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

impl Display for NonZeroU8

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

impl Display for BorrowError

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 TryFromIntError

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

impl Display for NonZeroU32

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

impl Display for NonZeroI8

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

impl Display for NonZeroI32

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

impl<'a> Display for PanicInfo<'a>

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

impl Display for EscapeDebug

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

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

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

impl<'a> Display for Location<'a>

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

impl<'a, T> Display for Pin<'a, T> where     T: Display + ?Sized,

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

impl Display for LayoutErr

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

impl Display for BorrowMutError

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

impl Display for DecodeUtf16Error

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

impl Display for NonZeroUsize

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

impl Display for Utf8Lossy

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

impl Display for ParseIntError

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

impl Display for TryFromSliceError

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

impl Display for NonZeroI16

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

impl Display for NonZeroI128

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

impl Display for ParseFloatError

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

impl Display for EscapeDefault

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

impl Display for NonZeroU16

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

impl Display for ToUppercase

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

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

impl Display for NonZeroU128

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

impl Display for CharTryFromError

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 NonZeroI64

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

Implementors

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

• impl<T: Display + ?Sized> Display for PinBox<T>

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

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

• impl Display for !

• impl Display for i32

• impl Display for bool

• impl Display for char

• impl Display for u128

• impl Display for Error

• impl Display for u16

• impl Display for u8

• impl Display for i128

• impl Display for i8

• impl Display for Utf8Error

• impl Display for i64

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

• impl Display for ParseBoolError

• impl Display for f64

• impl Display for f32

• impl Display for u64

• impl Display for isize

• impl Display for i16

• impl Display for str

• impl Display for usize

• impl Display for u32

• impl<'a> Display for Arguments<'a>

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

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

• impl Display for FromUtf8Error

• impl Display for FromUtf16Error

• impl Display for String

• impl Display for ParseError