1.0.0[][src]Trait frame_support::dispatch::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 };

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, }));
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Implementations on Foreign Types

impl<'_> Display for Display<'_>[src]

impl Display for FromVecWithNulError[src]

impl<W> Display for IntoInnerError<W>[src]

impl Display for SocketAddr[src]

impl Display for FromBytesWithNulError[src]

impl Display for SocketAddrV4[src]

impl Display for Ipv6Addr[src]

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

impl Display for Ipv4Addr[src]

impl<T> Display for PoisonError<T>[src]

impl<T> Display for SendError<T>[src]

impl<T> Display for TryLockError<T>[src]

impl<'_, T> Display for RwLockWriteGuard<'_, T> where
    T: Display + ?Sized
[src]

impl Display for ExitStatus[src]

impl Display for AccessError[src]

impl Display for AddrParseError[src]

impl<'_, T> Display for RwLockReadGuard<'_, T> where
    T: Display + ?Sized
[src]

impl Display for SystemTimeError[src]

impl Display for StripPrefixError[src]

impl Display for SocketAddrV6[src]

impl Display for TryRecvError[src]

impl Display for VarError[src]

impl<T> Display for TrySendError<T>[src]

impl Display for Backtrace[src]

impl Display for IntoStringError[src]

impl Display for JoinPathsError[src]

impl<'_, T> Display for MutexGuard<'_, T> where
    T: Display + ?Sized
[src]

impl Display for RecvTimeoutError[src]

impl Display for NulError[src]

impl Display for Error[src]

impl Display for IpAddr[src]

impl Display for RecvError[src]

impl<'a> Display for EscapeUnicode<'a>[src]

impl Display for ParseBoolError[src]

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

impl Display for NonZeroU16[src]

impl Display for NonZeroI8[src]

impl Display for i8[src]

impl<'_, T> Display for &'_ T where
    T: Display + ?Sized
[src]

impl Display for EscapeUnicode[src]

impl<'_> Display for Location<'_>[src]

impl Display for NonZeroI32[src]

impl Display for ParseIntError[src]

impl Display for i32[src]

impl Display for Utf8Lossy[src]

impl Display for NonZeroI128[src]

impl<T> Display for Wrapping<T> where
    T: Display
[src]

impl<'a> Display for EscapeDebug<'a>[src]

impl Display for BorrowMutError[src]

impl Display for CharTryFromError[src]

impl Display for u8[src]

impl Display for char[src]

impl Display for ![src]

impl Display for i128[src]

impl Display for i64[src]

impl Display for ParseCharError[src]

impl Display for ToLowercase[src]

impl Display for NonZeroI64[src]

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

impl Display for isize[src]

impl Display for u64[src]

impl Display for NonZeroI16[src]

impl Display for Utf8Error[src]

impl Display for EscapeDebug[src]

impl Display for usize[src]

impl Display for u128[src]

impl Display for NonZeroU32[src]

impl Display for f64[src]

impl<'a> Display for EscapeDefault<'a>[src]

impl Display for bool[src]

impl Display for u16[src]

impl Display for NonZeroUsize[src]

impl Display for BorrowError[src]

impl<P> Display for Pin<P> where
    P: Display
[src]

impl Display for LayoutErr[src]

impl Display for ParseFloatError[src]

impl Display for str[src]

impl Display for u32[src]

impl Display for ToUppercase[src]

impl Display for EscapeDefault[src]

impl Display for Infallible[src]

impl Display for EscapeDefault[src]

impl Display for NonZeroU64[src]

impl<'_> Display for PanicInfo<'_>[src]

impl Display for f32[src]

impl Display for NonZeroU8[src]

impl Display for NonZeroIsize[src]

impl Display for TryFromSliceError[src]

impl Display for DecodeUtf16Error[src]

impl Display for AllocErr[src]

impl Display for NonZeroU128[src]

impl<'_, T> Display for &'_ mut T where
    T: Display + ?Sized
[src]

impl Display for TryFromIntError[src]

impl Display for i16[src]

impl<T> Display for Rc<T> where
    T: Display + ?Sized
[src]

impl Display for FromUtf16Error[src]

impl<T> Display for Arc<T> where
    T: Display + ?Sized
[src]

impl Display for String[src]

impl Display for FromUtf8Error[src]

impl<T> Display for Box<T> where
    T: Display + ?Sized
[src]

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

impl Display for TryReserveError[src]

impl Display for Error[src]

impl<A> Display for ArrayString<A> where
    A: Array<Item = u8> + Copy
[src]

impl<T> Display for CapacityError<T>[src]

impl Display for Error

impl<'a> Display for Unexpected<'a>[src]

impl Display for Error[src]

impl<'a> Display for dyn Expected + 'a[src]

impl Display for Field[src]

impl Display for dyn Value + 'static[src]

impl Display for FieldSet[src]

impl Display for SetGlobalDefaultError[src]

impl Display for Level[src]

impl Display for LevelFilter[src]

impl<'a> Display for ValueSet<'a>[src]

impl Display for ParseLevelError[src]

impl Display for ParseLevelFilterError[src]

impl<T> Display for DisplayValue<T> where
    T: Display
[src]

impl Display for FromEnvError[src]

impl Display for Error[src]

impl Display for TryInitError[src]

impl Display for ParseError[src]

impl Display for Directive[src]

impl<E> Display for FormattedFields<E>[src]

impl Display for BadName[src]

impl Display for EnvFilter[src]

impl Display for Error

impl Display for Regex

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

Shows the original regular expression.

impl Display for Regex

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

Shows the original regular expression.

impl Display for Error

impl Display for Error

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.

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 ErrorKind

impl Display for UnicodeWordError

impl Display for ErrorKind

impl Display for Error

impl Display for CaseFoldError

impl Display for Error

impl Display for Error

impl Display for ParseLevelError[src]

impl Display for SetLoggerError[src]

impl Display for Level[src]

impl Display for LevelFilter[src]

impl<'a> Display for ANSIGenericStrings<'a, str>

impl<'a> Display for ANSIGenericString<'a, str>

impl Display for Suffix

impl Display for Prefix

impl Display for Infix

impl Display for Value[src]

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>[src]

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}");

impl Display for Error[src]

impl Display for Number[src]

impl Display for NaiveDate[src]

The Display output of the naive date d is the same as d.format("%Y-%m-%d").

The string printed can be readily parsed via the parse method on str.

Example

use chrono::NaiveDate;

assert_eq!(format!("{}", NaiveDate::from_ymd(2015,  9,  5)), "2015-09-05");
assert_eq!(format!("{}", NaiveDate::from_ymd(   0,  1,  1)), "0000-01-01");
assert_eq!(format!("{}", NaiveDate::from_ymd(9999, 12, 31)), "9999-12-31");

ISO 8601 requires an explicit sign for years before 1 BCE or after 9999 CE.

assert_eq!(format!("{}", NaiveDate::from_ymd(   -1,  1,  1)),  "-0001-01-01");
assert_eq!(format!("{}", NaiveDate::from_ymd(10000, 12, 31)), "+10000-12-31");

impl Display for NaiveTime[src]

The Display output of the naive time t is the same as t.format("%H:%M:%S%.f").

The string printed can be readily parsed via the parse method on str.

It should be noted that, for leap seconds not on the minute boundary, it may print a representation not distinguishable from non-leap seconds. This doesn't matter in practice, since such leap seconds never happened. (By the time of the first leap second on 1972-06-30, every time zone offset around the world has standardized to the 5-minute alignment.)

Example

use chrono::NaiveTime;

assert_eq!(format!("{}", NaiveTime::from_hms(23, 56, 4)),              "23:56:04");
assert_eq!(format!("{}", NaiveTime::from_hms_milli(23, 56, 4, 12)),    "23:56:04.012");
assert_eq!(format!("{}", NaiveTime::from_hms_micro(23, 56, 4, 1234)),  "23:56:04.001234");
assert_eq!(format!("{}", NaiveTime::from_hms_nano(23, 56, 4, 123456)), "23:56:04.000123456");

Leap seconds may also be used.

assert_eq!(format!("{}", NaiveTime::from_hms_milli(6, 59, 59, 1_500)), "06:59:60.500");

impl Display for RoundingError[src]

impl Display for Weekday[src]

impl<'a, I, B> Display for DelayedFormat<I> where
    B: Borrow<Item<'a>>,
    I: Clone + Iterator<Item = B>, 
[src]

impl Display for Utc[src]

impl<Tz> Display for Date<Tz> where
    Tz: TimeZone,
    <Tz as TimeZone>::Offset: Display
[src]

impl<Tz> Display for DateTime<Tz> where
    Tz: TimeZone,
    <Tz as TimeZone>::Offset: Display
[src]

impl Display for FixedOffset[src]

impl Display for ParseError[src]

impl Display for NaiveDateTime[src]

The Debug output of the naive date and time dt is the same as dt.format("%Y-%m-%d %H:%M:%S%.f").

It should be noted that, for leap seconds not on the minute boundary, it may print a representation not distinguishable from non-leap seconds. This doesn't matter in practice, since such leap seconds never happened. (By the time of the first leap second on 1972-06-30, every time zone offset around the world has standardized to the 5-minute alignment.)

Example

use chrono::NaiveDate;

let dt = NaiveDate::from_ymd(2016, 11, 15).and_hms(7, 39, 24);
assert_eq!(format!("{}", dt), "2016-11-15 07:39:24");

Leap seconds may also be used.

let dt = NaiveDate::from_ymd(2015, 6, 30).and_hms_milli(23, 59, 59, 1_500);
assert_eq!(format!("{}", dt), "2015-06-30 23:59:60.500");

impl Display for ParseError[src]

impl<'a> Display for TmFmt<'a>[src]

impl Display for SteadyTime[src]

impl Display for Duration[src]

impl Display for OutOfRangeError[src]

impl Display for ParseFloatError[src]

impl Display for CryptoTypePublicPair[src]

impl Display for ParseError[src]

impl Display for Public[src]

impl Display for CodeNotFound[src]

impl<'a> Display for HexDisplay<'a>[src]

impl Display for AccountId32[src]

impl Display for Public[src]

impl Display for Error[src]

impl Display for Ss58AddressFormat[src]

impl Display for Public[src]

impl Display for Trap

impl Display for Error

impl Display for Error

impl Display for ValueType

impl Display for Instruction

impl Display for Error

impl Display for Error

impl<T> Display for Ratio<T> where
    T: Display + Eq + One
[src]

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>[src]

Renders as numer/denom. If denom=1, renders as numer.

impl Display for ParseRatioError[src]

impl Display for BigUint[src]

impl Display for ParseBigIntError[src]

impl Display for BigInt[src]

impl Display for U256

impl Display for U128

impl Display for H160

impl Display for H512

impl Display for H256

impl Display for U512

impl Display for FromHexError

impl Display for WeightedError[src]

impl Display for ReadError[src]

impl Display for BernoulliError[src]

impl Display for Error[src]

impl Display for Error[src]

impl Display for FromDecStrErr

impl<A> Display for ArrayString<A> where
    A: Array<Item = u8>, 
[src]

impl<T> Display for CapacityError<T>[src]

impl Display for InvalidOutputSize

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

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

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

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

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

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

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

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

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

impl Display for Error[src]

impl Display for InvalidOutputSize

impl Display for InvalidKeyLength

impl Display for MacError

impl Display for MultiSignatureStage

impl Display for SignatureError

impl Display for MnemonicType

impl Display for ErrorKind

impl Display for Mnemonic

impl Display for Backtrace

impl Display for Error

impl<D> Display for Context<D> where
    D: 'static + Send + Sync + Display

impl<E> Display for Compat<E> where
    E: Display

impl<T> Display for SyncFailure<T> where
    T: Display

impl<'a> Display for BytesOrWideString<'a>[src]

impl<'a> Display for SymbolName<'a>[src]

impl<'a> Display for Demangle<'a>

impl Display for DwCfa

impl Display for DwCc

impl Display for DwLns

impl Display for DwInl

impl Display for DwEnd

impl Display for DwDsc

impl Display for DwAccess

impl Display for DwVirtuality

impl Display for DwDefaulted

impl Display for DwLang

impl Display for DwRle

impl Display for DwId

impl Display for DwEhPe

impl Display for DwTag

impl Display for Error

impl Display for DwMacro

impl Display for DwOp

impl Display for DwLle

impl Display for DwUt

impl Display for DwChildren

impl Display for DwForm

impl Display for DwOrd

impl Display for DwLne

impl Display for DwLnct

impl Display for DwAt

impl Display for DwAddr

impl Display for DwDs

impl<R, Offset> Display for LineInstruction<R, Offset> where
    Offset: ReaderOffset,
    R: Reader<Offset = Offset>, 

impl Display for DwAte

impl Display for DwIdx

impl Display for DwVis

impl Display for Error

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

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

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

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

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

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

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

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

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

impl<I> Display for Decompositions<I> where
    I: Clone + Iterator<Item = char>, 

impl<I> Display for Recompositions<I> where
    I: Clone + Iterator<Item = char>, 

impl<A> Display for TinyVec<A> where
    A: Array,
    <A as Array>::Item: Display

impl<A> Display for ArrayVec<A> where
    A: Array,
    <A as Array>::Item: Display

impl Display for Error

impl Display for FromHexError[src]

impl<T, Item> Display for ReuniteError<T, Item>[src]

impl<T> Display for ReuniteError<T>[src]

impl Display for Aborted[src]

impl Display for SpawnError[src]

impl Display for Canceled[src]

impl Display for SendError[src]

impl Display for TryRecvError[src]

impl<T> Display for TrySendError<T>[src]

impl Display for EnterError[src]

impl Display for ExecutionError[src]

impl Display for Error

impl<HO, CE> Display for Error<HO, CE> where
    CE: Error,
    HO: Debug

impl<T, E> Display for TrieError<T, E> where
    E: MaybeDebug,
    T: MaybeDebug, 

impl Display for RuntimeString[src]

impl<Block> Display for BlockId<Block> where
    Block: Block
[src]

impl Display for MultiSigner[src]

impl Display for Public

impl Display for Public

impl Display for Public

impl Display for FixedI64[src]

impl Display for FixedI128[src]

impl Display for FixedU128[src]

impl<L, R> Display for Either<L, R> where
    L: Display,
    R: Display
[src]

impl Display for Error[src]

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Implementors

impl Display for frame_support::dispatch::fmt::Error[src]

impl<'_> Display for Arguments<'_>[src]

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