Trait hacspec_lib::prelude::Display

1.0.0 · source · [−]
pub trait Display {
    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>;
}
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, }));

Implementors

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

impl Display for Error

impl Display for Prefix

impl Display for Infix

impl Display for Suffix

impl<'a> Display for ANSIString<'a>

impl<'a> Display for ANSIStrings<'a>

impl Display for Error

impl Display for LexError

impl Display for Group

impl Display for Punct

impl Display for Ident

impl Display for Literal

impl Display for Error

impl Display for Error

impl<'a> Display for Unexpected<'a>

impl<'a> Display for dyn Expected + 'a

impl Display for Error

impl Display for Value

impl Display for Number

impl Display for Lifetime

impl Display for LitInt

impl Display for LitFloat

impl<'a> Display for ParseBuffer<'a>

impl Display for Error

impl Display for Scalar

impl Display for Scalar

impl Display for Scalar