rocket::mtls::oid::asn1_rs::nom::lib::std::fmt

Trait Display

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1.0.0 · Source

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

Available on crate feature mtls only.

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.

§Internationalization

Because a type can only have one Display implementation, it is often preferable to only implement Display when there is a single most “obvious” way that values can be formatted as text. This could mean formatting according to the “invariant” culture and “undefined” locale, or it could mean that the type display is designed for a specific culture/locale, such as developer logs.

If not all values have a justifiably canonical textual format or if you want to support alternative formats not covered by the standard set of possible formatting traits, the most flexible approach is display adapters: methods like str::escape_default or Path::display which create a wrapper implementing Display to output the specific display format.

§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§

1.0.0 · Source

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

Formats the value using the given formatter.

§Errors

This function should return Err if, and only if, the provided Formatter returns Err. String formatting is considered an infallible operation; this function only returns a Result because writing to the underlying stream might fail and it must provide a way to propagate the fact that an error has occurred back up the stack.

§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 DisplayCopy item path

§Internationalization

§Examples

Required Methods§

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

§Errors

§Examples

Implementors§

impl Display for &dyn Show

impl Display for LogLevel

impl Display for Sig

impl Display for rocket::error::ErrorKind

impl Display for Entity

impl Display for rocket::form::error::ErrorKind<'_>

impl Display for rocket::http::Method

impl Display for SameSite

impl Display for rocket::http::uri::Uri<'_>

impl Display for rocket::serde::json::Value

impl Display for rocket::serde::msgpack::Error

impl Display for Variant

impl Display for Feature

impl Display for rocket::mtls::Error

impl Display for Class

impl Display for PEMError

impl Display for X509Error

impl Display for DerConstraint

impl Display for rocket::mtls::oid::asn1_rs::Error

impl Display for SerializeError

impl Display for Infallible

impl Display for AsciiChar

impl Display for IpAddr

impl Display for SocketAddr

impl Display for VarError

impl Display for std::io::error::ErrorKind

impl Display for RecvTimeoutError

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

impl Display for base64::alphabet::ParseAlphabetError

impl Display for base64::alphabet::ParseAlphabetError

impl Display for base64::decode::DecodeError

impl Display for base64::decode::DecodeError

impl Display for base64::decode::DecodeError

impl Display for base64::decode::DecodeSliceError

impl Display for base64::decode::DecodeSliceError

impl Display for base64::encode::EncodeSliceError

impl Display for base64::encode::EncodeSliceError

impl Display for const_oid::error::Error

impl Display for cookie::parse::ParseError

impl Display for KeyError

impl Display for DecodeKind

impl Display for Actual

impl Display for figment::error::Kind

impl Display for Source

impl Display for httparse::Error

impl Display for InlinableString

impl Display for log::Level

impl Display for log::LevelFilter

impl Display for multer::error::Error

impl Display for rmp_serde::encode::Error

impl Display for BytesReadError

impl Display for ValueReadError

impl Display for webpki::error::Error

impl Display for rustls::error::Error

impl Display for CollectionAllocErr

impl Display for time::error::Error

impl Display for Format

impl Display for InvalidFormatDescription

impl Display for Parse

impl Display for ParseFromDescription

impl Display for TryFromParsed

impl Display for Month

impl Display for Weekday

impl Display for AnyDelimiterCodecError

impl Display for LinesCodecError

impl Display for TryAcquireError

impl Display for tokio::sync::broadcast::error::RecvError

impl Display for tokio::sync::broadcast::error::TryRecvError

impl Display for tokio::sync::mpsc::error::TryRecvError

impl Display for tokio::sync::oneshot::error::TryRecvError

impl Display for toml::value::Value

impl Display for Offset

Trait Display