File: equivalent_trait.rs

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#[macro_use] extern crate indexmap;

use indexmap::Equivalent;

use std::hash::Hash;

#[derive(Debug, Hash)]
pub struct Pair<A, B>(pub A, pub B);

impl<A, B, C, D> PartialEq<(A, B)> for Pair<C, D>
    where C: PartialEq<A>,
          D: PartialEq<B>,
{
    fn eq(&self, rhs: &(A, B)) -> bool {
        self.0 == rhs.0 &&
        self.1 == rhs.1 &&
        true
    }
}

impl<A, B, X> Equivalent<X> for Pair<A, B>
    where Pair<A, B>: PartialEq<X>,
          A: Hash + Eq,
          B: Hash + Eq,
{
    fn equivalent(&self, other: &X) -> bool {
        *self == *other
    }
}

#[test]
fn test_lookup() {
    let s = String::from;
    let map = indexmap! {
        (s("a"), s("b")) => 1,
        (s("a"), s("x")) => 2,
    };

    assert!(map.contains_key(&Pair("a", "b")));
    assert!(!map.contains_key(&Pair("b", "a")));
}

#[test]
fn test_string_str() {
    let s = String::from;
    let mut map = indexmap! {
        s("a") => 1, s("b") => 2,
        s("x") => 3, s("y") => 4,
    };

    assert!(map.contains_key("a"));
    assert!(!map.contains_key("z"));
    assert_eq!(map.remove("b"), Some(2));
}