HashByRef

This is a small helper crate to use Rc<T> as hash keys where equality is supposed to be determined by the underlaying reference identity (i.e. by the value of the pointer). It provides a type HashByRef<T> that can be used as key in the hashmap.

Quick Start

hash_by_ref = "0.1.0"

```rust use std::collections::HashMap; use std::rc::Rc; use hashbyref::HashByRef;

let r1 = Rc::new(1);
let r2 = Rc::new(1);
let r3 = r1.clone();
let mut h = HashMap::new();
h.insert(HashByRef::new(r1.clone()),1);
h.insert(HashByRef::new(r2.clone()),2);
assert_eq!(h[&HashByRef::new(r1.clone())], 1);
assert_eq!(h[&HashByRef::new(r2.clone())], 2);
assert_eq!(h[&HashByRef::new(r3.clone())], 1);

```