src/test/run-pass/structured-compare.rs

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



enum foo { large, small, }

impl foo : cmp::Eq {
    pure fn eq(&self, other: &foo) -> bool {
        ((*self) as uint) == ((*other) as uint)
    }
    pure fn ne(&self, other: &foo) -> bool { !(*self).eq(other) }
}

fn main() {
    let a = (1, 2, 3);
    let b = (1, 2, 3);
    assert (a == b);
    assert (a != (1, 2, 4));
    assert (a < (1, 2, 4));
    assert (a <= (1, 2, 4));
    assert ((1, 2, 4) > a);
    assert ((1, 2, 4) >= a);
    let x = large;
    let y = small;
    assert (x != y);
    assert (x == large);
    assert (x != small);
}