Trait geng::prelude::Display

1.0.0 · source ·

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

Expand description

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§

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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, }));

Trait Implementations§

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impl ToValue for dyn Display

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fn to_value(&self) -> Value<'_>

Perform the conversion.

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impl Display for MatchesError

1.60.0 · source§

impl Display for geng::prelude::futures::io::ErrorKind

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impl Display for AsciiChar

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impl Display for Infallible

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impl Display for IpAddr

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impl Display for SocketAddr

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impl Display for VarError

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impl Display for std::sync::mpsc::RecvTimeoutError

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

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impl Display for DistanceModelError

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impl Display for gilrs::ff::Error

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impl Display for gilrs::gamepad::Error

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impl Display for MappingError

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impl Display for IpNet

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impl Display for url::parser::ParseError

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impl Display for SyntaxViolation

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impl Display for Variant

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impl Display for rand::distributions::bernoulli::BernoulliError

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impl Display for rand::distributions::weighted::WeightedError

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impl Display for geng::prelude::log::Level

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impl Display for geng::prelude::log::LevelFilter

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impl Display for geng::prelude::rand::distributions::BernoulliError

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impl Display for geng::prelude::rand::distributions::WeightedError

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impl Display for geng::prelude::ron::Error

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impl Display for geng::prelude::serde_json::Value

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impl Display for geng::prelude::toml::Value

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impl Display for Offset

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impl Display for bool

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impl Display for char

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impl Display for f32

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impl Display for f64

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impl Display for i8

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impl Display for i16

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impl Display for i32

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impl Display for i64

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impl Display for i128

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impl Display for isize

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impl Display for !

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impl Display for str

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impl Display for u8

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impl Display for u16

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impl Display for u32

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impl Display for u64

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impl Display for u128

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impl Display for usize

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impl Display for geng::prelude::anyhow::Error

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impl Display for Str

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impl Display for StyledStr

Color-unaware printing. Never uses coloring.

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impl Display for ValueRange

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impl Display for Arg

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impl Display for Command

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impl Display for Id

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impl Display for Arguments<'_>

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impl Display for geng::prelude::fmt::Error

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impl Display for geng::prelude::futures::channel::mpsc::SendError

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impl Display for geng::prelude::futures::channel::mpsc::TryRecvError

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impl Display for Canceled

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impl Display for EnterError

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impl Display for geng::prelude::futures::io::Error

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impl Display for Aborted

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impl Display for SpawnError

1.57.0 · source§

impl Display for alloc::collections::TryReserveError

1.58.0 · source§

impl Display for FromVecWithNulError

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impl Display for IntoStringError

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impl Display for NulError

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impl Display for FromUtf8Error

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impl Display for FromUtf16Error

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impl Display for String

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impl Display for LayoutError

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impl Display for AllocError

1.36.0 · source§

impl Display for core::array::TryFromSliceError

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impl Display for core::ascii::EscapeDefault

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impl Display for BorrowError

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impl Display for BorrowMutError

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impl Display for CharTryFromError

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impl Display for ParseCharError

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impl Display for DecodeUtf16Error

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impl Display for core::char::EscapeDebug

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impl Display for core::char::EscapeDefault

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impl Display for core::char::EscapeUnicode

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impl Display for ToLowercase

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impl Display for ToUppercase

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impl Display for TryFromCharError

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impl Display for FromBytesUntilNulError

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impl Display for FromBytesWithNulError

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impl Display for Ipv4Addr

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impl Display for Ipv6Addr

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

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impl Display for core::net::parser::AddrParseError

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impl Display for SocketAddrV4

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impl Display for SocketAddrV6

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

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impl Display for ParseIntError

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impl Display for TryFromIntError

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impl Display for NonZeroI8

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impl Display for NonZeroI16

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impl Display for NonZeroI32

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impl Display for NonZeroI64

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impl Display for NonZeroI128

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impl Display for NonZeroIsize

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impl Display for NonZeroU8

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impl Display for NonZeroU16

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impl Display for NonZeroU32

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impl Display for NonZeroU64

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impl Display for NonZeroU128

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impl Display for NonZeroUsize

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impl Display for Location<'_>

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impl Display for PanicInfo<'_>

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impl Display for ParseBoolError

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impl Display for Utf8Error

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impl Display for TryFromFloatSecsError

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impl Display for Backtrace

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impl Display for JoinPathsError

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impl Display for WriterPanicked

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impl Display for Display<'_>

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impl Display for StripPrefixError

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impl Display for ExitStatus

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impl Display for ExitStatusError

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impl Display for std::sync::mpsc::RecvError

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impl Display for std::thread::local::AccessError

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impl Display for SystemTimeError

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impl Display for CompressError

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impl Display for flate2::mem::DecompressError

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impl Display for TrafficWatcher

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impl Display for getrandom::error::Error

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impl Display for Code

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impl Display for GamepadId

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impl Display for h2::error::Error

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impl Display for Reason

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impl Display for bf16

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impl Display for f16

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impl Display for LengthLimitError

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impl Display for http::error::Error

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impl Display for HeaderName

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impl Display for InvalidHeaderName

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impl Display for InvalidHeaderValue

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impl Display for ToStrError

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impl Display for InvalidMethod

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impl Display for Method

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impl Display for InvalidStatusCode

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impl Display for StatusCode

Formats the status code, including the canonical reason.

§Example

assert_eq!(format!("{}", StatusCode::OK), "200 OK");

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impl Display for Authority

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impl Display for PathAndQuery

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impl Display for Scheme

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impl Display for InvalidUri

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impl Display for InvalidUriParts

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impl Display for Uri

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impl Display for indexmap::TryReserveError

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impl Display for Ipv4Net

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impl Display for Ipv6Net

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impl Display for PrefixLenError

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impl Display for ipnet::parser::AddrParseError

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impl Display for FromStrError

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impl Display for Mime

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impl Display for ParseRatioError

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impl Display for num_traits::ParseFloatError

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impl Display for reqwest::error::Error

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impl Display for ProgramLinkError

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impl Display for ShaderCompilationError

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impl Display for Url

Display the serialization of this URL.

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impl Display for uuid::error::Error

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impl Display for Braced

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impl Display for Hyphenated

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impl Display for Simple

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impl Display for Urn

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impl Display for Uuid

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impl Display for value_bag::error::Error

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impl Display for getrandom::error::Error

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impl Display for rand::rngs::adapter::read::ReadError

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impl Display for rand_core::error::Error

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impl Display for geng::prelude::log::kv::Error

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impl Display for geng::prelude::log::ParseLevelError

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impl Display for SetLoggerError

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impl Display for geng::prelude::rand::rngs::adapter::ReadError

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impl Display for geng::prelude::rand::Error

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impl Display for Position

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impl Display for SpannedError

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

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impl Display for geng::prelude::serde_json::Error

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impl Display for Number

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impl Display for geng::prelude::toml::de::Error

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impl Display for Map<String, Value>

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impl Display for geng::prelude::toml::ser::Error

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impl Display for Date

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impl Display for Datetime

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impl Display for DatetimeParseError

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impl Display for Time

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impl Display for AccessError

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impl Display for AcquireError

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impl Display for ActivateSlotError

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impl Display for AddrParseError

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impl Display for AlgAddr

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impl Display for AnyDelimiterCodecError

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impl Display for Array

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impl Display for ArrayOfTables

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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.

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