Trait odra::prelude::casper_event_standard::alloc::fmt::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.

§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§

source

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 odra::prelude::casper_event_standard::alloc::fmt::Display

§Internationalization

§Examples

Required Methods§

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

§Examples

Implementors§

impl Display for DeployReport

impl Display for AddKeyFailure

impl Display for odra::prelude::casper_event_standard::casper_types::account::FromStrError

impl Display for RemoveKeyFailure

impl Display for SetThresholdFailure

impl Display for UpdateKeyFailure

impl Display for odra::prelude::casper_event_standard::casper_types::bytesrepr::Error

impl Display for odra::prelude::casper_event_standard::casper_types::contracts::FromStrError

impl Display for ApiError

impl Display for CLValueError

impl Display for odra::prelude::casper_event_standard::casper_types::Error

impl Display for Key

impl Display for odra::prelude::casper_event_standard::casper_types::KeyFromStrError

impl Display for ParseSemVerError

impl Display for PublicKey

impl Display for SecretKey

impl Display for Signature

impl Display for odra::prelude::casper_event_standard::casper_types::TransferFromStrError

impl Display for odra::prelude::casper_event_standard::casper_types::URefFromStrError

impl Display for odra::prelude::casper_event_standard::casper_types::system::auction::Error

impl Display for odra::prelude::casper_event_standard::casper_types::system::Error

impl Display for SystemContractType

impl Display for odra::prelude::casper_event_standard::casper_types::system::handle_payment::Error

impl Display for odra::prelude::casper_event_standard::casper_types::system::mint::Error

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 TryRecvError

impl Display for base16::DecodeError

impl Display for base64::decode::DecodeError

impl Display for hex::error::FromHexError

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

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

impl Display for Value

impl Display for FromDecStrErr

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 FromUtf8Error

impl Display for FromUtf16Error

impl Display for String

impl Display for TryReserveError

impl Display for AccountHash

impl Display for TryFromSliceForContractHashError

impl Display for AccessRights

impl Display for CLTypeMismatch

impl Display for ContractHash

impl Display for ContractPackageHash

impl Display for ContractVersionKey

impl Display for ContractWasmHash

impl Display for EraId

impl Display for Gas

impl Display for Motes

impl Display for ProtocolVersion