Trait std::cmp::Eq 1.0.0
[−]
[src]
pub trait Eq: PartialEq<Self> { }Trait for equality comparisons which are equivalence relations.
This means, that in addition to a == b and a != b being strict inverses, the equality must
be (for all a, b and c):
- reflexive:
a == a; - symmetric:
a == bimpliesb == a; and - transitive:
a == bandb == cimpliesa == c.
This property cannot be checked by the compiler, and therefore Eq implies
PartialEq, and has no extra methods.
Derivable
This trait can be used with #[derive]. When derived, because Eq has
no extra methods, it is only informing the compiler that this is an
equivalence relation rather than a partial equivalence relation. Note that
the derive strategy requires all fields are PartialEq, which isn't
always desired.
How can I implement Eq?
If you cannot use the derive strategy, specify that your type implements
Eq, which has no methods:
enum BookFormat { Paperback, Hardback, Ebook } struct Book { isbn: i32, format: BookFormat, } impl PartialEq for Book { fn eq(&self, other: &Book) -> bool { self.isbn == other.isbn } } impl Eq for Book {}
Implementors
impl<T> Eq for Wrapping<T> where T: Eqimpl<T> Eq for NonZero<T> where T: Zeroable + Eqimpl<T> Eq for *const T where T: ?Sizedimpl<T> Eq for *mut T where T: ?Sizedimpl<Ret> Eq for fn() -> Retimpl<Ret> Eq for extern fn() -> Retimpl<Ret> Eq for unsafe fn() -> Retimpl<Ret> Eq for unsafe extern fn() -> Retimpl<Ret, A> Eq for fn(A) -> Retimpl<Ret, A> Eq for extern fn(A) -> Retimpl<Ret, A> Eq for unsafe fn(A) -> Retimpl<Ret, A> Eq for unsafe extern fn(A) -> Retimpl<Ret, A, B> Eq for fn(A, B) -> Retimpl<Ret, A, B> Eq for extern fn(A, B) -> Retimpl<Ret, A, B> Eq for unsafe fn(A, B) -> Retimpl<Ret, A, B> Eq for unsafe extern fn(A, B) -> Retimpl<Ret, A, B, C> Eq for fn(A, B, C) -> Retimpl<Ret, A, B, C> Eq for extern fn(A, B, C) -> Retimpl<Ret, A, B, C> Eq for unsafe fn(A, B, C) -> Retimpl<Ret, A, B, C> Eq for unsafe extern fn(A, B, C) -> Retimpl<Ret, A, B, C, D> Eq for fn(A, B, C, D) -> Retimpl<Ret, A, B, C, D> Eq for extern fn(A, B, C, D) -> Retimpl<Ret, A, B, C, D> Eq for unsafe fn(A, B, C, D) -> Retimpl<Ret, A, B, C, D> Eq for unsafe extern fn(A, B, C, D) -> Retimpl<Ret, A, B, C, D, E> Eq for fn(A, B, C, D, E) -> Retimpl<Ret, A, B, C, D, E> Eq for extern fn(A, B, C, D, E) -> Retimpl<Ret, A, B, C, D, E> Eq for unsafe fn(A, B, C, D, E) -> Retimpl<Ret, A, B, C, D, E> Eq for unsafe extern fn(A, B, C, D, E) -> Retimpl<Ret, A, B, C, D, E, F> Eq for fn(A, B, C, D, E, F) -> Retimpl<Ret, A, B, C, D, E, F> Eq for extern fn(A, B, C, D, E, F) -> Retimpl<Ret, A, B, C, D, E, F> Eq for unsafe fn(A, B, C, D, E, F) -> Retimpl<Ret, A, B, C, D, E, F> Eq for unsafe extern fn(A, B, C, D, E, F) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for fn(A, B, C, D, E, F, G) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for extern fn(A, B, C, D, E, F, G) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for unsafe fn(A, B, C, D, E, F, G) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for unsafe extern fn(A, B, C, D, E, F, G) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Eq for fn(A, B, C, D, E, F, G, H) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Eq for extern fn(A, B, C, D, E, F, G, H) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe fn(A, B, C, D, E, F, G, H) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe extern fn(A, B, C, D, E, F, G, H) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I> Eq for fn(A, B, C, D, E, F, G, H, I) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I> Eq for extern fn(A, B, C, D, E, F, G, H, I) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I> Eq for unsafe fn(A, B, C, D, E, F, G, H, I) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I> Eq for unsafe extern fn(A, B, C, D, E, F, G, H, I) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J> Eq for fn(A, B, C, D, E, F, G, H, I, J) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J> Eq for extern fn(A, B, C, D, E, F, G, H, I, J) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J> Eq for unsafe fn(A, B, C, D, E, F, G, H, I, J) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J> Eq for unsafe extern fn(A, B, C, D, E, F, G, H, I, J) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J, K> Eq for fn(A, B, C, D, E, F, G, H, I, J, K) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J, K> Eq for extern fn(A, B, C, D, E, F, G, H, I, J, K) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J, K> Eq for unsafe fn(A, B, C, D, E, F, G, H, I, J, K) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J, K> Eq for unsafe extern fn(A, B, C, D, E, F, G, H, I, J, K) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Eq for fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Eq for extern fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Eq for unsafe fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Eq for unsafe extern fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Retimpl<T> Eq for PhantomData<T> where T: ?Sizedimpl Eq for RangeFullimpl<Idx> Eq for Range<Idx> where Idx: Eqimpl<Idx> Eq for RangeFrom<Idx> where Idx: Eqimpl<Idx> Eq for RangeTo<Idx> where Idx: Eqimpl<Idx> Eq for RangeInclusive<Idx> where Idx: Eqimpl<Idx> Eq for RangeToInclusive<Idx> where Idx: Eqimpl Eq for Orderingimpl Eq for ()impl Eq for boolimpl Eq for charimpl Eq for usizeimpl Eq for u8impl Eq for u16impl Eq for u32impl Eq for u64impl Eq for isizeimpl Eq for i8impl Eq for i16impl Eq for i32impl Eq for i64impl<'a, A> Eq for &'a A where A: Eq + ?Sizedimpl<'a, A> Eq for &'a mut A where A: Eq + ?Sizedimpl Eq for TypeIdimpl<T> Eq for [T; 0] where T: Eqimpl<T> Eq for [T; 1] where T: Eqimpl<T> Eq for [T; 2] where T: Eqimpl<T> Eq for [T; 3] where T: Eqimpl<T> Eq for [T; 4] where T: Eqimpl<T> Eq for [T; 5] where T: Eqimpl<T> Eq for [T; 6] where T: Eqimpl<T> Eq for [T; 7] where T: Eqimpl<T> Eq for [T; 8] where T: Eqimpl<T> Eq for [T; 9] where T: Eqimpl<T> Eq for [T; 10] where T: Eqimpl<T> Eq for [T; 11] where T: Eqimpl<T> Eq for [T; 12] where T: Eqimpl<T> Eq for [T; 13] where T: Eqimpl<T> Eq for [T; 14] where T: Eqimpl<T> Eq for [T; 15] where T: Eqimpl<T> Eq for [T; 16] where T: Eqimpl<T> Eq for [T; 17] where T: Eqimpl<T> Eq for [T; 18] where T: Eqimpl<T> Eq for [T; 19] where T: Eqimpl<T> Eq for [T; 20] where T: Eqimpl<T> Eq for [T; 21] where T: Eqimpl<T> Eq for [T; 22] where T: Eqimpl<T> Eq for [T; 23] where T: Eqimpl<T> Eq for [T; 24] where T: Eqimpl<T> Eq for [T; 25] where T: Eqimpl<T> Eq for [T; 26] where T: Eqimpl<T> Eq for [T; 27] where T: Eqimpl<T> Eq for [T; 28] where T: Eqimpl<T> Eq for [T; 29] where T: Eqimpl<T> Eq for [T; 30] where T: Eqimpl<T> Eq for [T; 31] where T: Eqimpl<T> Eq for [T; 32] where T: Eqimpl<T> Eq for Cell<T> where T: Copy + Eqimpl Eq for BorrowStateimpl<T> Eq for RefCell<T> where T: Eq + ?Sizedimpl<T> Eq for Option<T> where T: Eqimpl<T, E> Eq for Result<T, E> where E: Eq, T: Eqimpl<T> Eq for [T] where T: Eqimpl Eq for SearchStepimpl Eq for Utf8Errorimpl Eq for strimpl Eq for Errorimpl<A> Eq for (A,) where A: Eqimpl<A, B> Eq for (A, B) where A: Eq, B: Eqimpl<A, B, C> Eq for (A, B, C) where A: Eq, B: Eq, C: Eqimpl<A, B, C, D> Eq for (A, B, C, D) where A: Eq, B: Eq, C: Eq, D: Eqimpl<A, B, C, D, E> Eq for (A, B, C, D, E) where A: Eq, B: Eq, C: Eq, D: Eq, E: Eqimpl<A, B, C, D, E, F> Eq for (A, B, C, D, E, F) where A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F: Eqimpl<A, B, C, D, E, F, G> Eq for (A, B, C, D, E, F, G) where A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F: Eq, G: Eqimpl<A, B, C, D, E, F, G, H> Eq for (A, B, C, D, E, F, G, H) where A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F: Eq, G: Eq, H: Eqimpl<A, B, C, D, E, F, G, H, I> Eq for (A, B, C, D, E, F, G, H, I) where A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F: Eq, G: Eq, H: Eq, I: Eqimpl<A, B, C, D, E, F, G, H, I, J> Eq for (A, B, C, D, E, F, G, H, I, J) where A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F: Eq, G: Eq, H: Eq, I: Eq, J: Eqimpl<A, B, C, D, E, F, G, H, I, J, K> Eq for (A, B, C, D, E, F, G, H, I, J, K) where A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F: Eq, G: Eq, H: Eq, I: Eq, J: Eq, K: Eqimpl<A, B, C, D, E, F, G, H, I, J, K, L> Eq for (A, B, C, D, E, F, G, H, I, J, K, L) where A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F: Eq, G: Eq, H: Eq, I: Eq, J: Eq, K: Eq, L: Eqimpl<T> Eq for Box<T> where T: Eq + ?Sizedimpl<T> Eq for Arc<T> where T: Eq + ?Sizedimpl<T> Eq for Rc<T> where T: Eq + ?Sizedimpl<K, V> Eq for BTreeMap<K, V> where K: Eq, V: Eqimpl<T> Eq for BTreeSet<T> where T: Eqimpl<'a, B> Eq for Cow<'a, B> where B: Eq + ToOwned + ?Sizedimpl<E> Eq for EnumSet<E> where E: Eqimpl<A> Eq for LinkedList<A> where A: Eqimpl Eq for Stringimpl Eq for ParseErrorimpl<T> Eq for Vec<T> where T: Eqimpl<A> Eq for VecDeque<A> where A: Eqimpl<T> Eq for Bound<T> where T: Eqimpl Eq for DecodeUtf16Errorimpl Eq for LocalKeyStateimpl<K, V, S> Eq for HashMap<K, V, S> where K: Eq + Hash, V: Eq, S: BuildHasherimpl<T, S> Eq for HashSet<T, S> where T: Eq + Hash, S: BuildHasherimpl Eq for VarErrorimpl Eq for CStringimpl Eq for CStrimpl Eq for OsStringimpl Eq for OsStrimpl Eq for Permissionsimpl Eq for FileTypeimpl Eq for ErrorKindimpl Eq for SeekFromimpl Eq for IpAddrimpl Eq for Ipv6MulticastScopeimpl Eq for Ipv4Addrimpl Eq for Ipv6Addrimpl Eq for SocketAddrimpl Eq for SocketAddrV4impl Eq for SocketAddrV6impl<'a> Eq for Prefix<'a>impl<'a> Eq for PrefixComponent<'a>impl<'a> Eq for Component<'a>impl<'a> Eq for Components<'a>impl Eq for PathBufimpl Eq for StripPrefixErrorimpl Eq for Pathimpl Eq for Outputimpl Eq for ExitStatusimpl<T: Eq> Eq for SendError<T>impl Eq for RecvErrorimpl Eq for TryRecvErrorimpl Eq for RecvTimeoutErrorimpl<T: Eq> Eq for TrySendError<T>impl Eq for WaitTimeoutResultimpl Eq for Durationimpl Eq for Instantimpl Eq for SystemTime