57 lines
1.5 KiB
Rust
57 lines
1.5 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::cmp::PartialEq;
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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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