use std::fmt::Display;
/// A generic struct `Point` that can hold two values of the same type `T`.
struct Point<T> {
x: T,
y: T,
}
/// Implementation block for `Point<T>` where `T` can be any type.
impl<T> Point<T> {
fn x(&self) -> &T {
&self.x
}
}
/// Implementation block for Point<f32> only.
impl Point<f32> {
/// A method specific to `Point<f32>`:
fn distance_from_origin(&self) -> f32 {
(self.x.powi(2) + self.y.powi(2)).sqrt()
}
}
/// You may also use Trait Bounds to conditionally implement methods.
/// The following is only implemented for `Point<T>` when `T` implements both
/// the `Display` and `PartialOrd` traits.
impl<T: Display + PartialOrd> Point<T> {
fn cmp_display(&self) {
if self.x >= self.y {
println!("The largest member is x = {}", self.x);
} else {
println!("The largest member is y = {}", self.y);
}
}
}
fn main() {
let p = Point { x: 5, y: 10 };
println!("p.x = {}", p.x());
}
