mirror of https://github.com/rust-lang/rust
47 lines
1.0 KiB
Rust
47 lines
1.0 KiB
Rust
//@ run-pass
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use std::ops::{Add, Sub, Mul};
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trait MyNum : Add<Output=Self> + Sub<Output=Self> + Mul<Output=Self> + PartialEq + Clone { }
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#[derive(Clone, Debug)]
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struct MyInt { val: isize }
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impl Add for MyInt {
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type Output = MyInt;
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fn add(self, other: MyInt) -> MyInt { mi(self.val + other.val) }
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}
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impl Sub for MyInt {
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type Output = MyInt;
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fn sub(self, other: MyInt) -> MyInt { mi(self.val - other.val) }
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}
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impl Mul for MyInt {
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type Output = MyInt;
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fn mul(self, other: MyInt) -> MyInt { mi(self.val * other.val) }
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}
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impl PartialEq for MyInt {
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fn eq(&self, other: &MyInt) -> bool { self.val == other.val }
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fn ne(&self, other: &MyInt) -> bool { !self.eq(other) }
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}
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impl MyNum for MyInt {}
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fn f<T:MyNum>(x: T, y: T) -> (T, T, T) {
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return (x.clone() + y.clone(), x.clone() - y.clone(), x * y);
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}
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fn mi(v: isize) -> MyInt { MyInt { val: v } }
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pub fn main() {
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let (x, y) = (mi(3), mi(5));
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let (a, b, c) = f(x, y);
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assert_eq!(a, mi(8));
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assert_eq!(b, mi(-2));
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assert_eq!(c, mi(15));
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}
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