Expand description
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 };
assert_eq!(format!("The origin is: {origin}"), "The origin is: (0, 0)");
Required Methods
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, }));
Implementations on Foreign Types
1.8.0 · sourceimpl Display for SystemTimeError
impl Display for SystemTimeError
1.26.0 · sourceimpl Display for AccessError
impl Display for AccessError
1.20.0 · sourceimpl<'_, T> Display for RwLockWriteGuard<'_, T> where
T: Display + ?Sized,
impl<'_, T> Display for RwLockWriteGuard<'_, T> where
T: Display + ?Sized,
1.20.0 · sourceimpl<'_, T> Display for MutexGuard<'_, T> where
T: Display + ?Sized,
impl<'_, T> Display for MutexGuard<'_, T> where
T: Display + ?Sized,
1.20.0 · sourceimpl<'_, T> Display for RwLockReadGuard<'_, T> where
T: Display + ?Sized,
impl<'_, T> Display for RwLockReadGuard<'_, T> where
T: Display + ?Sized,
1.15.0 · sourceimpl Display for RecvTimeoutError
impl Display for RecvTimeoutError
sourceimpl<T> Display for PoisonError<T>
impl<T> Display for PoisonError<T>
sourceimpl Display for ExitStatusError
impl Display for ExitStatusError
sourceimpl<'a, K, V> Display for OccupiedError<'a, K, V> where
K: Debug,
V: Debug,
impl<'a, K, V> Display for OccupiedError<'a, K, V> where
K: Debug,
V: Debug,
sourceimpl<T> Display for TrySendError<T>
impl<T> Display for TrySendError<T>
sourceimpl Display for JoinPathsError
impl Display for JoinPathsError
sourceimpl<T> Display for TryLockError<T>
impl<T> Display for TryLockError<T>
1.7.0 · sourceimpl Display for StripPrefixError
impl Display for StripPrefixError
1.34.0 · sourceimpl Display for NonZeroI128
impl Display for NonZeroI128
1.9.0 · sourceimpl Display for DecodeUtf16Error
impl Display for DecodeUtf16Error
sourceimpl Display for ParseBoolError
impl Display for ParseBoolError
1.34.0 · sourceimpl Display for TryFromIntError
impl Display for TryFromIntError
1.34.0 · sourceimpl Display for NonZeroI16
impl Display for NonZeroI16
1.59.0 · sourceimpl Display for TryFromCharError
impl Display for TryFromCharError
1.34.0 · sourceimpl<'a> Display for EscapeDefault<'a>
impl<'a> Display for EscapeDefault<'a>
1.28.0 · sourceimpl Display for NonZeroU64
impl Display for NonZeroU64
1.34.0 · sourceimpl Display for Infallible
impl Display for Infallible
1.28.0 · sourceimpl Display for NonZeroU128
impl Display for NonZeroU128
1.28.0 · sourceimpl Display for LayoutError
impl Display for LayoutError
1.34.0 · sourceimpl Display for NonZeroI32
impl Display for NonZeroI32
1.28.0 · sourceimpl Display for NonZeroU32
impl Display for NonZeroU32
sourceimpl Display for FromBytesUntilNulError
impl Display for FromBytesUntilNulError
1.16.0 · sourceimpl Display for EscapeDefault
impl Display for EscapeDefault
1.28.0 · sourceimpl Display for NonZeroU16
impl Display for NonZeroU16
1.20.0 · sourceimpl Display for ParseCharError
impl Display for ParseCharError
1.28.0 · sourceimpl Display for NonZeroUsize
impl Display for NonZeroUsize
sourceimpl Display for FromFloatSecsError
impl Display for FromFloatSecsError
1.34.0 · sourceimpl Display for CharTryFromError
impl Display for CharTryFromError
1.60.0 · sourceimpl<'a> Display for EscapeAscii<'a>
impl<'a> Display for EscapeAscii<'a>
sourceimpl Display for ParseFloatError
impl Display for ParseFloatError
1.17.0 · sourceimpl Display for FromBytesWithNulError
impl Display for FromBytesWithNulError
1.34.0 · sourceimpl<'a> Display for EscapeDebug<'a>
impl<'a> Display for EscapeDebug<'a>
1.39.0 · sourceimpl Display for EscapeDefault
impl Display for EscapeDefault
1.34.0 · sourceimpl Display for NonZeroI64
impl Display for NonZeroI64
1.34.0 · sourceimpl<'a> Display for EscapeUnicode<'a>
impl<'a> Display for EscapeUnicode<'a>
1.36.0 · sourceimpl Display for TryFromSliceError
impl Display for TryFromSliceError
1.13.0 · sourceimpl Display for BorrowError
impl Display for BorrowError
1.34.0 · sourceimpl Display for NonZeroIsize
impl Display for NonZeroIsize
1.16.0 · sourceimpl Display for ToUppercase
impl Display for ToUppercase
1.16.0 · sourceimpl Display for EscapeUnicode
impl Display for EscapeUnicode
1.13.0 · sourceimpl Display for BorrowMutError
impl Display for BorrowMutError
sourceimpl<T> Display for Saturating<T> where
T: Display,
impl<T> Display for Saturating<T> where
T: Display,
1.16.0 · sourceimpl Display for ToLowercase
impl Display for ToLowercase
1.20.0 · sourceimpl Display for EscapeDebug
impl Display for EscapeDebug
1.57.0 · sourceimpl Display for TryReserveError
impl Display for TryReserveError
sourceimpl Display for FromUtf16Error
impl Display for FromUtf16Error
1.58.0 · sourceimpl Display for FromVecWithNulError
impl Display for FromVecWithNulError
1.7.0 · sourceimpl Display for IntoStringError
impl Display for IntoStringError
sourceimpl<T> Display for DisplayValue<T> where
T: Display,
impl<T> Display for DisplayValue<T> where
T: Display,
sourceimpl Display for ParseLevelFilterError
impl Display for ParseLevelFilterError
sourceimpl Display for SetGlobalDefaultError
impl Display for SetGlobalDefaultError
sourceimpl Display for ParseLevelError
impl Display for ParseLevelError
sourceimpl Display for ParseLevelError
impl Display for ParseLevelError
sourceimpl Display for SetLoggerError
impl Display for SetLoggerError
sourceimpl Display for AddressParseError
impl Display for AddressParseError
impl<T, Item> Display for ReuniteError<T, Item>
impl<T, Item> Display for ReuniteError<T, Item>
impl<'a, K, V, S, A> Display for OccupiedError<'a, K, V, S, A> where
K: Debug,
V: Debug,
A: Allocator + Clone,
impl<'a, K, V, S, A> Display for OccupiedError<'a, K, V, S, A> where
K: Debug,
V: Debug,
A: Allocator + Clone,
sourceimpl<'a> Display for Unexpected<'a>
impl<'a> Display for Unexpected<'a>
sourceimpl<'a> Display for SymbolName<'a>
impl<'a> Display for SymbolName<'a>
sourceimpl<'a> Display for BytesOrWideString<'a>
impl<'a> Display for BytesOrWideString<'a>
impl<R, Offset> Display for LineInstruction<R, Offset> where
R: Reader<Offset = Offset>,
Offset: ReaderOffset,
impl<R, Offset> Display for LineInstruction<R, Offset> where
R: Reader<Offset = Offset>,
Offset: ReaderOffset,
sourceimpl<E> Display for FormattedFields<E> where
E: ?Sized,
impl<E> Display for FormattedFields<E> where
E: ?Sized,
impl Display for Regex
impl Display for Regex
impl Display for Regex
impl Display for Regex
impl Display for Hir
impl Display for Hir
Print a display representation of this Hir.
The result of this is a valid regular expression pattern string.
This implementation uses constant stack space and heap space proportional
to the size of the Hir
.
impl Display for Ast
impl Display for Ast
Print a display representation of this Ast.
This does not preserve any of the original whitespace formatting that may have originally been present in the concrete syntax from which this Ast was generated.
This implementation uses constant stack space and heap space proportional
to the size of the Ast
.
sourceimpl Display for SecureChannelError
impl Display for SecureChannelError
sourceimpl Display for IdentityIdentifier
impl Display for IdentityIdentifier
sourceimpl Display for InvalidKeyLength
impl Display for InvalidKeyLength
sourceimpl Display for Value
impl Display for Value
sourcefn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
Display a JSON value as a string.
let json = json!({ "city": "London", "street": "10 Downing Street" });
// Compact format:
//
// {"city":"London","street":"10 Downing Street"}
let compact = format!("{}", json);
assert_eq!(compact,
"{\"city\":\"London\",\"street\":\"10 Downing Street\"}");
// Pretty format:
//
// {
// "city": "London",
// "street": "10 Downing Street"
// }
let pretty = format!("{:#}", json);
assert_eq!(pretty,
"{\n \"city\": \"London\",\n \"street\": \"10 Downing Street\"\n}");
Implementors
impl Display for OckamError
impl Display for IpAddr
impl Display for SocketAddr
impl Display for BernoulliError
impl Display for WeightedError
impl Display for ockam::compat::tokio::io::ErrorKind
impl Display for ockam::compat::tokio::sync::broadcast::error::RecvError
impl Display for ockam::compat::tokio::sync::broadcast::error::TryRecvError
impl Display for TryAcquireError
impl Display for ockam::compat::tokio::sync::mpsc::error::TryRecvError
impl Display for ockam::compat::tokio::sync::oneshot::error::TryRecvError
impl Display for ErrorCode
impl Display for Address
impl Display for Any
impl Display for ockam::Error
impl Display for ProtocolId
impl Display for Route
impl Display for TransportMessage
impl Display for WriterPanicked
impl Display for AddrParseError
impl Display for Ipv4Addr
impl Display for Ipv6Addr
Write an Ipv6Addr, conforming to the canonical style described by RFC 5952.