50 lines
1.3 KiB
Rust
50 lines
1.3 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 cmp::Eq;
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trait MyNum : Add<self,self> Sub<self,self> Mul<self,self> Eq { }
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struct MyInt { val: int }
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impl MyInt : Add<MyInt, MyInt> {
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pure fn add(&self, other: &MyInt) -> MyInt { mi(self.val + other.val) }
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}
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impl MyInt : Sub<MyInt, MyInt> {
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pure fn sub(&self, other: &MyInt) -> MyInt { mi(self.val - other.val) }
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}
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impl MyInt : Mul<MyInt, MyInt> {
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pure fn mul(&self, other: &MyInt) -> MyInt { mi(self.val * other.val) }
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}
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impl MyInt : Eq {
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pure fn eq(&self, other: &MyInt) -> bool { self.val == other.val }
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pure fn ne(&self, other: &MyInt) -> bool { !self.eq(other) }
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}
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impl MyInt : MyNum;
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fn f<T:Copy MyNum>(x: T, y: T) -> (T, T, T) {
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return (x + y, x - y, x * y);
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}
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pure fn mi(v: int) -> MyInt { MyInt { val: v } }
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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 a == mi(8);
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assert b == mi(-2);
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assert c == mi(15);
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}
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