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
Implementations on Foreign Types
impl<'a> Eq for Utf8LossyChunk<'a>[src]
impl<'a> Eq for Utf8LossyChunk<'a>Implementors
impl<T> Eq for [T; 27] where
T: Eq,impl Eq for Errorimpl Eq for boolimpl<T> Eq for ManuallyDrop<T> where
T: Eq,impl Eq for u32impl Eq for i8impl<T> Eq for NonNull<T> where
T: ?Sized,impl<T> Eq for [T; 22] where
T: Eq,impl<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<Ret, A, B, C, D, E, F, G, H> Eq for unsafe fn(A, B, C, D, E, F, G, H) -> Retimpl<Idx> Eq for RangeTo<Idx> where
Idx: Eq,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 unsafe fn(A, B, C, D, E, F, G) -> Retimpl<T> Eq for Bound<T> where
T: Eq,impl<T> Eq for [T; 3] 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<T> Eq for [T; 23] where
T: Eq,impl<Ret, A, B> Eq for fn(A, B) -> Retimpl<Ret> Eq for unsafe fn() -> Retimpl<T> Eq for [T; 1] where
T: Eq,impl Eq for NonZeroU16impl<Ret, A, B> Eq for unsafe fn(A, B) -> Retimpl Eq for NonZeroU128impl<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<Idx> Eq for RangeToInclusive<Idx> where
Idx: Eq,impl Eq for Durationimpl 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<Idx> Eq for Range<Idx> where
Idx: Eq,impl<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; 30] where
T: Eq,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 [T; 17] where
T: Eq,impl<T> Eq for [T; 7] 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, 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; 11] where
T: Eq,impl Eq for u128impl<Ret, A, B, C> Eq for fn(A, B, C) -> Retimpl Eq for NonZeroU8impl<T> Eq for [T; 29] where
T: Eq,impl<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 Eq for u8impl<T> Eq for [T; 26] where
T: Eq,impl<Ret, A, B, C, D, E, F, G> Eq for extern "C" fn(A, B, C, D, E, F, G) -> 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 Eq for RangeFullimpl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C, ...) -> Retimpl Eq for i128impl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(A, B, C, D, E, F, ...) -> Retimpl Eq for FpCategoryimpl<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> Eq for extern "C" fn(A, B, C, D, ...) -> 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 extern "C" fn(A, B, C, D, E, F, G, H) -> Retimpl Eq for ParseFloatErrorimpl<T> Eq for Option<T> where
T: Eq,impl<A> Eq for (A,) where
A: Eq + ?Sized,impl<Ret, A, B> Eq for extern "C" fn(A, B, ...) -> Retimpl Eq for CannotReallocInPlaceimpl<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<A, B> Eq for (A, B) where
A: Eq,
B: Eq + ?Sized,impl<'a, A> Eq for &'a mut A where
A: Eq + ?Sized,impl<T> Eq for [T] where
T: Eq,impl Eq for ParseBoolErrorimpl<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> Eq for unsafe extern "C" fn(A) -> 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<T> Eq for [T; 19] where
T: Eq,impl Eq for Pinnedimpl<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 Eq for u16impl<T> Eq for [T; 5] where
T: Eq,impl<T> Eq for [T; 24] where
T: Eq,impl<Ret, A, B> Eq for unsafe extern "C" fn(A, B, ...) -> Retimpl<Idx> Eq for RangeInclusive<Idx> where
Idx: 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 Eq for ParseCharErrorimpl<Ret, A> Eq for extern "C" fn(A, ...) -> Retimpl<T> Eq for Poll<T> where
T: Eq,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<Ret, A, B, C, D> Eq for fn(A, B, C, D) -> 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> 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 unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L) -> 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; 12] where
T: Eq,impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C) -> Retimpl<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> Eq for fn(A, B, C, D, E) -> 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 i16impl<T> Eq for [T; 13] where
T: Eq,impl<T> Eq for [T; 18] where
T: Eq,impl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E) -> Retimpl<Ret, A, B, C> Eq for unsafe fn(A, B, C) -> 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 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 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; 32] where
T: Eq,impl<T> Eq for Discriminant<T>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<Ret, A, B, C, D, E, F, G> Eq for fn(A, B, C, D, E, F, G) -> Retimpl<T> Eq for [T; 16] where
T: Eq,impl Eq for charimpl<T> Eq for [T; 14] where
T: Eq,impl Eq for u64impl<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 unsafe 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<'a, A> Eq for &'a A where
A: Eq + ?Sized,impl<Y, R> Eq for GeneratorState<Y, R> where
R: Eq,
Y: 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> Eq for fn(A, B, C, D, E, F, G, H) -> Retimpl Eq for LayoutErrimpl<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 Eq for i32impl<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 NonZeroUsizeimpl Eq for NonZeroU64impl<T> Eq for [T; 31] where
T: Eq,impl<T> Eq for [T; 6] where
T: Eq,impl Eq for ()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> Eq for fn() -> Retimpl<T> Eq for PhantomData<T> where
T: ?Sized,impl Eq for ParseIntErrorimpl<T> Eq for [T; 4] where
T: Eq,impl Eq for SearchStepimpl<T, E> Eq for Result<T, E> where
E: Eq,
T: Eq,impl<T> Eq for [T; 0] where
T: Eq,impl Eq for UnicodeVersionimpl<Ret, A, B, C, D, E, F> Eq for unsafe fn(A, B, C, D, E, F) -> Retimpl<Ret, A, B, C> Eq for extern "C" fn(A, B, C, ...) -> 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 *const T where
T: ?Sized,impl Eq for InvalidSequenceimpl Eq for !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 Eq for Layoutimpl<Ret> Eq for extern "C" fn() -> 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 Eq for AllocErrimpl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(A, B, C, D, E, ...) -> Retimpl<Ret, A> Eq for unsafe fn(A) -> Retimpl Eq for usizeimpl<Ret, A> Eq for fn(A) -> Retimpl Eq for NoneErrorimpl<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> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I, ...) -> Retimpl<T> Eq for [T; 15] 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; 21] 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 Eq for TypeIdimpl<Ret, A, B> Eq for extern "C" fn(A, B) -> Retimpl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D) -> Retimpl<T> Eq for [T; 2] where
T: Eq,impl Eq for DecodeUtf16Errorimpl<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> Eq for unsafe extern "C" fn(A, ...) -> Retimpl<T> Eq for Reverse<T> where
T: Eq,impl<T> Eq for *mut T where
T: ?Sized,impl Eq for Utf8Errorimpl<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, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E, ...) -> 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 fn(A, B, C, D, E, F, G, H, I, J, K) -> Retimpl Eq for NonZeroU32impl<T> Eq for [T; 10] where
T: Eq,impl<H> Eq for BuildHasherDefault<H>impl<T> Eq for Cell<T> where
T: Copy + Eq,impl<Ret> Eq for unsafe extern "C" fn() -> Retimpl<T> Eq for [T; 25] where
T: Eq,impl Eq for i64impl<T> Eq for [T; 8] where
T: Eq,impl<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 isizeimpl<Ret, A> Eq for extern "C" fn(A) -> Retimpl<Idx> Eq for RangeFrom<Idx> where
Idx: Eq,impl Eq for strimpl<T> Eq for [T; 9] 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 Eq for CharTryFromErrorimpl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C) -> Retimpl<T> Eq for Wrapping<T> where
T: Eq,impl<T> Eq for [T; 28] where
T: Eq,impl Eq for Stringimpl<A> Eq for VecDeque<A> where
A: Eq,impl Eq for CollectionAllocErrimpl<'a, B> Eq for Cow<'a, B> where
B: Eq + ToOwned + ?Sized,impl<T> Eq for LinkedList<T> where
T: Eq,impl<K, V> Eq for BTreeMap<K, V> where
K: Eq,
V: Eq,impl<T> Eq for Arc<T> where
T: Eq + ?Sized,impl<T> Eq for Box<T> where
T: Eq + ?Sized,impl<T> Eq for Rc<T> where
T: Eq + ?Sized,impl Eq for ParseErrorimpl<T> Eq for BTreeSet<T> where
T: Eq,impl<T> Eq for Vec<T> where
T: Eq,impl 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 Instantimpl Eq for SystemTime