37 lines
607 B
Rust
37 lines
607 B
Rust
// run-pass
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#![allow(dead_code)]
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#![allow(non_snake_case)]
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use std::ops::Add;
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trait Positioned<S> {
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fn SetX(&mut self, _: S);
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fn X(&self) -> S;
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}
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trait Movable<S: Add<Output=S>>: Positioned<S> {
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fn translate(&mut self, dx: S) {
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let x = self.X() + dx;
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self.SetX(x);
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}
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}
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struct Point { x: isize, y: isize }
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impl Positioned<isize> for Point {
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fn SetX(&mut self, x: isize) {
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self.x = x;
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}
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fn X(&self) -> isize {
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self.x
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}
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}
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impl Movable<isize> for Point {}
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pub fn main() {
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let mut p = Point{ x: 1, y: 2};
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p.translate(3);
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assert_eq!(p.X(), 4);
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}
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