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 Utf8Lossy

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

impl Display for DecodeUtf16Error

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

impl Display for ToUppercase

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

impl Display for ToLowercase

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

impl Display for CharTryFromError

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

impl Display for ParseIntError

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

impl Display for EscapeUnicode

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

impl Display for BorrowError

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

impl Display for ParseFloatError

fn fmt(&self, f: &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, T> Display for Ref<'a, T> where
    T: Display + ?Sized, 

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

impl Display for ParseCharError

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 TryFromSliceError

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

impl Display for BorrowMutError

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

impl Display for TryFromIntError

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

impl Display for EscapeDefault

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

impl Display for Infallible

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

Implementors

• impl Display for AllocErr
• impl Display for CannotReallocInPlace
• impl<T: Display + ?Sized> Display for Box<T>
• impl<T: ?Sized + Display> Display for Arc<T>
• impl<T: ?Sized + Display> Display for Rc<T>
• impl Display for i32
• impl<'a> Display for Arguments<'a>
• impl Display for Utf8Error
• impl Display for u8
• impl Display for u64
• impl Display for str
• impl Display for u32
• impl<'a, T> Display for &'a T where
    T: Display + ?Sized, 
• impl Display for f64
• impl Display for usize
• impl Display for bool
• impl<'a, T> Display for &'a mut T where
    T: Display + ?Sized, 
• impl Display for i16
• impl Display for f32
• impl Display for char
• impl Display for i8
• impl Display for u128
• impl Display for u16
• impl Display for ParseBoolError
• impl Display for Error
• impl Display for isize
• impl Display for i128
• impl Display for i64
• impl Display for !
• 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