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 Eq, 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 {}Run
Implementors
impl<K, V> Eq for BTreeMap<K, V> where K: Eq, V: Eqimpl<'a, B> Eq for Cow<'a, B> where B: Eq + ToOwned + ?Sizedimpl<T> Eq for LinkedList<T> where T: Eqimpl Eq for ParseErrorimpl<T> Eq for Vec<T> where T: Eqimpl<A> Eq for VecDeque<A> where A: Eqimpl<T> Eq for BTreeSet<T> where T: Eqimpl<E> Eq for EnumSet<E> where E: Eqimpl Eq for Stringimpl<T> Eq for Bound<T> where T: 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<T> Eq for Discriminant<T>impl<T> Eq for *const T where T: ?Sizedimpl<T> Eq for *mut T where T: ?Sizedimpl Eq for Orderingimpl Eq for !impl<'a, A> Eq for &'a A where A: Eq + ?Sizedimpl<'a, A> Eq for &'a mut A where A: Eq + ?Sizedimpl<T> Eq for Cell<T> where T: Copy + Eqimpl<T> Eq for RefCell<T> where T: Eq + ?Sizedimpl<T> Eq for [T] where T: Eqimpl Eq for strimpl<T> Eq for Wrapping<T> where T: Eqimpl Eq for ParseFloatErrorimpl Eq for FpCategoryimpl Eq for ParseIntErrorimpl<T> Eq for NonZero<T> where T: Zeroable + Eqimpl<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 extern fn(A, ...) -> Retimpl<Ret, A> Eq for unsafe fn(A) -> Retimpl<Ret, A> Eq for unsafe extern 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 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> 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 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> 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 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> 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 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> 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 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> 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 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> 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 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> 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 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> 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 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> 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 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> 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 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<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 ()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 Eq for u128impl Eq for i128impl 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 Eq for BorrowStateimpl Eq for CharTryFromErrorimpl Eq for InvalidSequenceimpl<T> Eq for Option<T> where T: Eqimpl<T, E> Eq for Result<T, E> where E: Eq, T: Eqimpl Eq for SearchStepimpl Eq for ParseBoolErrorimpl Eq for Utf8Errorimpl 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 Eq for DecodeUtf16Errorimpl Eq for LocalKeyStateimpl Eq for ThreadIdimpl<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 NulErrorimpl Eq for FromBytesWithNulErrorimpl Eq for IntoStringErrorimpl 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 Eq for AddrParseErrorimpl Eq for Shutdownimpl<'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