Struct 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)));

Tuple Fields

0: T

Trait Implementations

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

fn as_ref(&self) -> &U

Converts this type into a shared reference of the (usually inferred) input type.

impl<T: Same> Borrow<T> for RefCmp<T>

fn borrow(&self) -> &T

Immutably borrows from an owned value.

impl<T: Same> Deref for RefCmp<T>

type Target = T

The resulting type after dereferencing.

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

Dereferences the value.

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, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T: Same> PartialEq for RefCmp<T>

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: Same> Eq for RefCmp<T>