Trait std::fmt::Display  1.0.0[−][src]
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, }));