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