46 lines
1.1 KiB
Rust
46 lines
1.1 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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trait Panda<T> {
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fn chomp(&self, bamboo: &T) -> T;
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}
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trait Add<RHS,Result>: Panda<RHS> {
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fn add(&self, rhs: &RHS) -> Result;
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}
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trait MyNum : Add<Self,Self> { }
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struct MyInt { val: int }
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impl Panda<MyInt> for MyInt {
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fn chomp(&self, bamboo: &MyInt) -> MyInt {
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mi(self.val + bamboo.val)
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}
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}
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impl Add<MyInt, MyInt> for MyInt {
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fn add(&self, other: &MyInt) -> MyInt { self.chomp(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 {
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return x.add(&y).chomp(&y);
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}
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fn mi(v: int) -> 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 z = f(x, y);
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assert_eq!(z.val, 13);
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}
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