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<'a> Eq for Utf8LossyChunk<'a>impl Eq for DecodeUtf16Errorimpl<Ret, A, B, C, D, E, F, G> Eq for extern "C" fn(A, B, C, D, E, F, G, ...) -> Retimpl<Ret, A, B, C, D, E, F> Eq for fn(A, B, C, D, E, F) -> Retimpl<T> Eq for [T; 28] where
T: Eq,impl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe fn(A, B, C, D, E, F, G, H) -> Retimpl<T> Eq for PhantomData<T> where
T: ?Sized,impl<T> Eq for [T; 17] where
T: Eq,impl<Ret, A, B> Eq for extern "C" fn(A, B) -> Retimpl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E, ...) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J, K> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K) -> 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, 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> Eq for fn(A, B) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J, K> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, ...) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, ...) -> Retimpl<A, B, C, D, E> Eq for (A, B, C, D, E) where
A: Eq,
B: Eq,
C: Eq,
D: Eq,
E: Eq + ?Sized,impl<T> Eq for [T; 7] where
T: Eq,impl Eq for strimpl<A> Eq for (A,) where
A: Eq + ?Sized,impl<T> Eq for [T; 30] where
T: Eq,impl<T> Eq for [T; 12] where
T: Eq,impl Eq for Errorimpl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Retimpl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(A, B, C, D, E, ...) -> 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> Eq for extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I, ...) -> Retimpl<Idx> Eq for RangeToInclusive<Idx> where
Idx: Eq,impl<Ret, A> Eq for extern "C" fn(A) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L, ...) -> Retimpl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C) -> Retimpl Eq for u128impl<Idx> Eq for RangeInclusive<Idx> where
Idx: Eq,impl<T> Eq for [T; 24] where
T: Eq,impl<T> Eq for [T; 14] where
T: Eq,impl<T> Eq for [T; 11] where
T: Eq,impl<Ret, A, B, C, D, E, F, G, H> Eq for fn(A, B, C, D, E, F, G, H) -> Retimpl Eq for ParseFloatErrorimpl<Ret, A, B, C> Eq for extern "C" fn(A, B, C) -> Retimpl<Ret> Eq for extern "C" fn() -> 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, H, I, J> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I, J) -> Retimpl<T> Eq for [T; 19] where
T: Eq,impl Eq for u8impl<Ret, A, B, C> Eq for fn(A, B, C) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J, K> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, ...) -> Retimpl<Ret, A, B, C, D> Eq for fn(A, B, C, D) -> Retimpl<T> Eq for [T; 13] where
T: Eq,impl Eq for RangeFullimpl Eq for ParseIntErrorimpl Eq for usizeimpl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C, ...) -> Retimpl<T, E> Eq for Result<T, E> where
E: Eq,
T: Eq,impl Eq for CharTryFromErrorimpl<Ret, A, B, C, D, E> Eq for unsafe fn(A, B, C, D, E) -> Retimpl Eq for u64impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D, ...) -> 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<T> Eq for [T; 9] where
T: Eq,impl Eq for SearchStepimpl<Ret, A, B, C, D, E, F, G> Eq for extern "C" fn(A, B, C, D, E, F, G) -> Retimpl Eq for !impl Eq for boolimpl<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> Eq for extern "C" fn(A, B, C, D, ...) -> Retimpl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(A, B, C, D, E) -> Retimpl<T> Eq for Wrapping<T> where
T: Eq,impl<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: Eq + ?Sized,impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D) -> Retimpl<T> Eq for *const T where
T: ?Sized,impl Eq for Utf8Errorimpl<Idx> Eq for Range<Idx> where
Idx: Eq,impl<Ret, A, B, C, D, E, F, G, H, I> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I) -> Retimpl Eq for Orderingimpl<T> Eq for [T; 10] where
T: Eq,impl<Idx> Eq for RangeTo<Idx> where
Idx: Eq,impl<Ret, A, B> Eq for unsafe extern "C" fn(A, B) -> Retimpl<T> Eq for [T; 22] where
T: Eq,impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C, ...) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H) -> Retimpl<Ret, A, B, C, D, E, F> Eq for unsafe extern "C" fn(A, B, C, D, E, F, ...) -> Retimpl Eq for u16impl<Ret, A, B, C, D, E, F, G, H, I> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, ...) -> Retimpl<'a, A> Eq for &'a mut A where
A: Eq + ?Sized,impl<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: Eq + ?Sized,impl<Ret, A, B> Eq for unsafe fn(A, B) -> Retimpl Eq for i8impl<Ret, A, B, C> Eq for unsafe fn(A, B, C) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G) -> Retimpl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E) -> Retimpl<Ret, A> Eq for unsafe extern "C" fn(A) -> Retimpl Eq for charimpl<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<A, B, C, D> Eq for (A, B, C, D) where
A: Eq,
B: Eq,
C: Eq,
D: Eq + ?Sized,impl<T> Eq for [T; 5] where
T: Eq,impl<T> Eq for [T; 23] where
T: Eq,impl<T> Eq for [T; 26] where
T: Eq,impl Eq for FpCategoryimpl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(A, B, C, D, E, F) -> Retimpl Eq for ()impl<Ret, A, B, C, D, E> Eq for fn(A, B, C, D, E) -> Retimpl<Ret, A, B, C, D, E, F> Eq for unsafe extern "C" fn(A, B, C, D, E, F) -> Retimpl<T> Eq for [T; 2] where
T: Eq,impl<Ret> Eq for unsafe fn() -> Retimpl<T> Eq for [T; 3] where
T: Eq,impl<T> Eq for [T; 6] where
T: Eq,impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L, ...) -> Retimpl<Ret, A> Eq for unsafe fn(A) -> Retimpl<Ret, A, B> Eq for extern "C" fn(A, B, ...) -> 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<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: Eq + ?Sized,impl<T> Eq for [T; 4] where
T: Eq,impl<T> Eq for [T; 8] where
T: Eq,impl<Ret> Eq for fn() -> 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 unsafe extern "C" fn(A, B, C, D, E, F, G, H, I) -> Retimpl<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: Eq + ?Sized,impl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(A, B, C, D, E, F, ...) -> Retimpl Eq for i32impl Eq for ParseBoolErrorimpl<Ret, A, B> Eq for unsafe extern "C" fn(A, B, ...) -> Retimpl Eq for i64impl<Idx> Eq for RangeFrom<Idx> where
Idx: Eq,impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K) -> Retimpl<Ret, A> Eq for unsafe extern "C" fn(A, ...) -> Retimpl<T> Eq for [T; 15] where
T: Eq,impl<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: Eq + ?Sized,impl<T> Eq for [T; 29] where
T: Eq,impl<Ret, A> Eq for extern "C" fn(A, ...) -> Retimpl<T> Eq for Discriminant<T>impl Eq for TypeIdimpl<T> Eq for [T; 0] where
T: Eq,impl<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> Eq for unsafe fn(A, B, C, D) -> Retimpl<T> Eq for [T; 18] where
T: Eq,impl<T> Eq for Reverse<T> where
T: Eq,impl<Ret, A, B, C, D, E, F, G> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, ...) -> Retimpl Eq for i16impl<T> Eq for Cell<T> where
T: Copy + Eq,impl<T> Eq for [T; 21] where
T: Eq,impl<T> Eq for [T; 25] where
T: Eq,impl<T> Eq for [T; 1] where
T: Eq,impl<T> Eq for NonZero<T> where
T: Zeroable + Eq,impl<T> Eq for *mut T where
T: ?Sized,impl<T> Eq for [T] where
T: Eq,impl<T> Eq for [T; 27] where
T: Eq,impl<T> Eq for [T; 20] where
T: Eq,impl<Ret, A, B, C, D, E, F, G, H> Eq for extern "C" fn(A, B, C, D, E, F, G, H) -> Retimpl<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: Eq + ?Sized,impl Eq for isizeimpl<T> Eq for [T; 32] where
T: Eq,impl<A, B> Eq for (A, B) where
A: Eq,
B: Eq + ?Sized,impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Retimpl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D) -> Retimpl<T> Eq for Option<T> where
T: Eq,impl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Retimpl<T> Eq for [T; 16] where
T: Eq,impl<T> Eq for RefCell<T> where
T: Eq + ?Sized,impl<T> Eq for [T; 31] where
T: Eq,impl<Ret, A, B, C, D, E, F, G, H, I, J> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J) -> Retimpl<Ret> Eq for unsafe extern "C" fn() -> Retimpl<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: Eq + ?Sized,impl Eq for u32impl<Ret, A> Eq for fn(A) -> Retimpl<'a, A> Eq for &'a A where
A: Eq + ?Sized,impl<Ret, A, B, C, D, E, F, G> Eq for fn(A, B, C, D, E, F, G) -> Retimpl Eq for InvalidSequenceimpl<A, B, C> Eq for (A, B, C) where
A: Eq,
B: Eq,
C: Eq + ?Sized,impl Eq for i128impl<Ret, A, B, C, D, E, F, G, H, I, J> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I, J, ...) -> Retimpl<T> Eq for Box<T> where
T: Eq + ?Sized,impl<K, V> Eq for BTreeMap<K, V> where
K: Eq,
V: Eq,impl<T> Eq for Bound<T> where
T: Eq,impl<A> Eq for VecDeque<A> where
A: Eq,impl Eq for ParseErrorimpl Eq for AllocErrimpl Eq for CannotReallocInPlaceimpl<T> Eq for Arc<T> where
T: Eq + ?Sized,impl<T> Eq for LinkedList<T> where
T: Eq,impl<T> Eq for Rc<T> where
T: Eq + ?Sized,impl<'a, B> Eq for Cow<'a, B> where
B: Eq + ToOwned + ?Sized,impl Eq for Stringimpl<T> Eq for Vec<T> where
T: Eq,impl<T> Eq for BTreeSet<T> where
T: Eq,impl Eq for Layoutimpl Eq for LocalKeyStateimpl Eq for ThreadIdimpl<K, V, S> Eq for HashMap<K, V, S> where
K: Eq + Hash,
V: Eq,
S: BuildHasher,impl<T, S> Eq for HashSet<T, S> where
T: Eq + Hash,
S: BuildHasher,impl 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