src/test/run-pass/issues/issue-3979-generics.rs

   1 // run-pass
   2 #![allow(dead_code)]
   3 #![allow(non_snake_case)]
   4
   5 use std::ops::Add;
   6
   7 trait Positioned<S> {
   8   fn SetX(&mut self, _: S);
   9   fn X(&self) -> S;
  10 }
  11
  12 trait Movable<S: Add<Output=S>>: Positioned<S> {
  13   fn translate(&mut self, dx: S) {
  14     let x = self.X() + dx;
  15     self.SetX(x);
  16   }
  17 }
  18
  19 struct Point { x: isize, y: isize }
  20
  21 impl Positioned<isize> for Point {
  22     fn SetX(&mut self, x: isize) {
  23         self.x = x;
  24     }
  25     fn X(&self) -> isize {
  26         self.x
  27     }
  28 }
  29
  30 impl Movable<isize> for Point {}
  31
  32 pub fn main() {
  33     let mut p = Point{ x: 1, y: 2};
  34     p.translate(3);
  35     assert_eq!(p.X(), 4);
  36 }