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