std::fmt::Display

Trait std::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

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, }));

Implementors

• impl<'a, B> Display for Cow<'a, B> where
    B: Display + ToOwned + ?Sized,
    <B as ToOwned>::Owned: Display, 
• impl Display for FromUtf8Error
• impl Display for FromUtf16Error
• impl Display for String
• impl Display for ParseError
• impl<T> Display for Box<T> where
    T: Display + ?Sized, 
• impl<T> Display for Arc<T> where
    T: Display + ?Sized, 
• impl<T> Display for Rc<T> where
    T: Display + ?Sized, 
• impl<T> Display for Wrapping<T> where
    T: Display, 
• impl Display for ParseFloatError
• impl Display for TryFromIntError
• impl Display for ParseIntError
• impl Display for BorrowError
• impl Display for BorrowMutError
• impl Display for CharTryFromError
• impl Display for EscapeUnicode
• impl Display for EscapeDefault
• impl Display for EscapeDebug
• impl Display for ParseBoolError
• impl Display for Utf8Error
• impl<'a> Display for Arguments<'a>
• impl Display for std::fmt::Error
• impl Display for !
• impl Display for bool
• impl Display for str
• impl Display for char
• impl Display for f32
• impl Display for f64
• impl Display for i8
• impl Display for u8
• impl Display for i16
• impl Display for u16
• impl Display for i32
• impl Display for u32
• impl Display for i64
• impl Display for u64
• impl Display for i128
• impl Display for u128
• impl Display for isize
• impl Display for usize
• impl<'a, T> Display for &'a T where
    T: Display + ?Sized, 
• impl<'a, T> Display for &'a mut T where
    T: Display + ?Sized, 
• impl Display for ToLowercase
• impl Display for ToUppercase
• impl Display for DecodeUtf16Error
• impl Display for VarError
• impl Display for JoinPathsError
• impl Display for NulError
• impl Display for FromBytesWithNulError
• impl Display for IntoStringError
• impl<W> Display for IntoInnerError<W>
• impl Display for std::io::Error
• impl Display for CharsError
• impl Display for IpAddr
• impl Display for Ipv4Addr
• impl Display for Ipv6Addr
• impl Display for SocketAddr
• impl Display for SocketAddrV4
• impl Display for SocketAddrV6
• impl Display for AddrParseError
• impl<'a> Display for Display<'a>
• impl Display for StripPrefixError
• impl Display for ExitStatus
• impl<T> Display for SendError<T>
• impl<T> Display for TrySendError<T>
• impl Display for RecvError
• impl Display for TryRecvError
• impl Display for RecvTimeoutError
• impl Display for SystemTimeError
• impl<T> Display for PoisonError<T>
• impl<T> Display for TryLockError<T>