Trait kernel::fmt::Display

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

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)");

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

Implementors

impl Display for DecodeError

impl Display for EncodeError

impl Display for AsciiChar

impl Display for Infallible

impl Display for IpAddr

impl Display for SocketAddr

impl Display for VarError

impl Display for ErrorKind

impl Display for RecvTimeoutError

impl Display for std::sync::mpsc::TryRecvError

impl Display for Variant

impl Display for bool

impl Display for char

impl Display for f32

impl Display for f64

impl Display for i8

impl Display for i16

impl Display for i32

impl Display for i64

impl Display for i128

impl Display for isize

impl Display for !

impl Display for str

impl Display for u8

impl Display for u16

impl Display for u32

impl Display for u64

impl Display for u128

impl Display for usize

impl Display for Uuid

impl Display for kernel::trace::dispatch::SetGlobalDefaultError

impl Display for kernel::trace::field::Field

impl Display for kernel::trace::field::FieldSet

impl Display for kernel::trace::metadata::LevelFilter

impl Display for kernel::trace::metadata::ParseLevelError

impl Display for kernel::trace::metadata::ParseLevelFilterError

impl Display for kernel::trace::Level

impl Display for kernel::tracing::field::Field

impl Display for kernel::tracing::field::FieldSet

impl Display for kernel::tracing::metadata::LevelFilter

impl Display for kernel::tracing::metadata::ParseLevelError

impl Display for kernel::tracing::metadata::ParseLevelFilterError

impl Display for kernel::tracing::Level

impl Display for kernel::tracing::subscriber::SetGlobalDefaultError

impl Display for TryReserveError

impl Display for FromVecWithNulError

impl Display for IntoStringError

impl Display for NulError

impl Display for FromUtf8Error

impl Display for FromUtf16Error

impl Display for alloc::string::String

impl Display for LayoutError

impl Display for AllocError

impl Display for TryFromSliceError

impl Display for core::ascii::EscapeDefault

impl Display for BorrowError

impl Display for BorrowMutError

impl Display for CharTryFromError

impl Display for ParseCharError

impl Display for DecodeUtf16Error

impl Display for core::char::EscapeDebug

impl Display for core::char::EscapeDefault

impl Display for core::char::EscapeUnicode

impl Display for ToLowercase

impl Display for ToUppercase

impl Display for TryFromCharError

impl Display for FromBytesUntilNulError

impl Display for FromBytesWithNulError

impl Display for Ipv4Addr

impl Display for Ipv6Addr

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

impl Display for AddrParseError

impl Display for SocketAddrV4

impl Display for SocketAddrV6

impl Display for core::num::dec2flt::ParseFloatError

impl Display for ParseIntError

impl Display for TryFromIntError

impl Display for NonZeroI8

impl Display for NonZeroI16

impl Display for NonZeroI32

impl Display for NonZeroI64

impl Display for NonZeroI128

impl Display for NonZeroIsize

impl Display for NonZeroU8

impl Display for NonZeroU16

impl Display for NonZeroU32

impl Display for NonZeroU64

impl Display for NonZeroU128

impl Display for NonZeroUsize

impl Display for Location<'_>

impl Display for PanicInfo<'_>

impl Display for ParseBoolError

impl Display for Utf8Error

impl Display for TryFromFloatSecsError

impl Display for Backtrace

impl Display for JoinPathsError

impl Display for WriterPanicked

impl Display for std::io::error::Error

impl Display for Display<'_>

impl Display for StripPrefixError

impl Display for ExitStatus

impl Display for ExitStatusError

impl Display for RecvError

impl Display for AccessError

impl Display for SystemTimeError

impl Display for getrandom::error::Error

impl Display for num_traits::ParseFloatError

impl Display for serde::de::value::Error

impl Display for uuid::error::Error

impl Display for Braced

impl Display for Hyphenated

impl Display for Simple

impl Display for Urn

impl Display for Arguments<'_>

impl Display for kernel::fmt::Error

impl Display for Aborted

impl Display for Canceled

impl Display for Closed

impl Display for Elapsed

impl Display for EnterError

impl Display for Error

impl Display for MetaId

impl Display for Point

impl Display for SendError

impl Display for Size

impl Display for SpawnError

impl Display for TaskId

impl Display for TimerError

impl Display for TryAcquireError

impl Display for TryRecvError

impl Display for WaitError

impl Display for dyn Value + 'static

impl Display for dyn Value + 'static

impl<'a> Display for Unexpected<'a>

impl<'a> Display for kernel::trace::field::ValueSet<'a>

impl<'a> Display for kernel::tracing::field::ValueSet<'a>

impl<'a> Display for EscapeAscii<'a>

impl<'a> Display for core::str::iter::EscapeDebug<'a>

impl<'a> Display for core::str::iter::EscapeDefault<'a>

impl<'a> Display for core::str::iter::EscapeUnicode<'a>

impl<'a> Display for dyn Expected + 'a

impl<'a, K, V> Display for std::collections::hash::map::OccupiedError<'a, K, V>where K: Debug, V: Debug,

impl<'a, K, V, A> Display for alloc::collections::btree::map::entry::OccupiedError<'a, K, V, A>where K: Debug + Ord, V: Debug, A: Allocator + Clone,

impl<'a, R, G, T> Display for MappedReentrantMutexGuard<'a, R, G, T>where R: RawMutex + 'a, G: GetThreadId + 'a, T: Display + 'a + ?Sized,

impl<'a, R, G, T> Display for ReentrantMutexGuard<'a, R, G, T>where R: RawMutex + 'a, G: GetThreadId + 'a, T: Display + 'a + ?Sized,

impl<'a, R, T> Display for MappedMutexGuard<'a, R, T>where R: RawMutex + 'a, T: Display + 'a + ?Sized,

impl<'a, R, T> Display for MappedRwLockReadGuard<'a, R, T>where R: RawRwLock + 'a, T: Display + 'a + ?Sized,

impl<'a, R, T> Display for MappedRwLockWriteGuard<'a, R, T>where R: RawRwLock + 'a, T: Display + 'a + ?Sized,

impl<'a, R, T> Display for MutexGuard<'a, R, T>where R: RawMutex + 'a, T: Display + 'a + ?Sized,

impl<'a, R, T> Display for RwLockReadGuard<'a, R, T>where R: RawRwLock + 'a, T: Display + 'a + ?Sized,

impl<'a, R, T> Display for RwLockUpgradableReadGuard<'a, R, T>where R: RawRwLockUpgrade + 'a, T: Display + 'a + ?Sized,

impl<'a, R, T> Display for RwLockWriteGuard<'a, R, T>where R: RawRwLock + 'a, T: Display + 'a + ?Sized,

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

impl<'a, T> Display for MutexGuard<'a, T>where T: Display,

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

impl<'rwlock, T> Display for RwLockReadGuard<'rwlock, T>where T: Display + ?Sized,

impl<'rwlock, T, R> Display for RwLockUpgradableGuard<'rwlock, T, R>where T: Display + ?Sized,

impl<'rwlock, T, R> Display for RwLockWriteGuard<'rwlock, T, R>where T: Display + ?Sized,

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

impl<E> Display for Report<E>where E: Error,

impl<E> Display for Error<E>where E: Error + 'static,

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

impl<P> Display for Arc<P>where P: Pool, <P as Pool>::Data: Display,

impl<P> Display for Box<P, Init>where P: Pool, <P as Pool>::Data: Display,

impl<T> Display for std::sync::mpsc::TrySendError<T>

impl<T> Display for TryLockError<T>

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

impl<T> Display for &mut Twhere T: Display + ?Sized,

impl<T> Display for kernel::trace::field::DisplayValue<T>where T: Display,

impl<T> Display for kernel::tracing::field::DisplayValue<T>where T: Display,

impl<T> Display for ThinBox<T>where T: Display + ?Sized,

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

impl<T> Display for alloc::sync::Arc<T>where T: Display + ?Sized,

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

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

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

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

impl<T> Display for std::sync::mpsc::SendError<T>

impl<T> Display for std::sync::mutex::MutexGuard<'_, T>where T: Display + ?Sized,

impl<T> Display for PoisonError<T>

impl<T> Display for std::sync::rwlock::RwLockReadGuard<'_, T>where T: Display + ?Sized,

impl<T> Display for std::sync::rwlock::RwLockWriteGuard<'_, T>where T: Display + ?Sized,

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

impl<T> Display for Box<T, Init>where T: Display,

impl<T> Display for FmtOption<'_, T>where T: Display,

impl<T> Display for JoinError<T>

impl<T> Display for ReuniteError<T>

impl<T> Display for TryInitError<T>

impl<T> Display for TrySendError<T>

impl<T, A> Display for alloc::boxed::Box<T, A>where T: Display + ?Sized, A: Allocator,

impl<T, E> Display for TryChunksError<T, E>where E: Display,

impl<T, Item> Display for ReuniteError<T, Item>

impl<W> Display for IntoInnerError<W>

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

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

impl<T: Display> Display for HeapArc<T>

impl Display for BorrowError