Struct same::RefCmp

pub struct RefCmp<T: Same>(pub T);

Wrapper for types to make their equality operations compare pointers.

This wrapper turns Same into PartialEq and RefHash into Hash. It is mainly useful for storing unique objects in hash sets and similar data structures.

Example

use same::RefCmp;

use std::rc::Rc;
use std::collections::HashSet;

let a = ::std::sync::Arc::new(42);
let a_cloned = a.clone();
let b = ::std::sync::Arc::new(42);

let mut hash_set = ::std::collections::HashSet::new();
assert!(hash_set.insert(RefCmp(a)));
// a_cloned points to the same object as a...
assert!(!hash_set.insert(RefCmp(a_cloned)));
// but `b` doesn't, even though it has same value.
assert!(hash_set.insert(RefCmp(b)));

Trait Implementations

impl<T: Same> Eq for RefCmp<T>

impl<T: Same> PartialEq for RefCmp<T>

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<T: Same + RefHash> Hash for RefCmp<T>

fn hash<H: Hasher>(&self, hasher: &mut H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where     H: Hasher,

Feeds a slice of this type into the given [Hasher].

impl<T: Same> Deref for RefCmp<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<U, T: Same + AsRef<U>> AsRef<U> for RefCmp<T>

fn as_ref(&self) -> &U

Performs the conversion.

impl<T: Same> Borrow<T> for RefCmp<T>

fn borrow(&self) -> &T

Immutably borrows from an owned value.