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<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 !impl Eq for u128impl<T> Eq for Poll<T> 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<T> Eq for Option<T> where
T: Eq,impl<Ret, A> Eq for extern "C" fn(A) -> Retimpl<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, H, I, J> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I, J) -> 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, I, J> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J) -> Retimpl<Ret, A, B> Eq for unsafe extern "C" fn(A, B) -> Retimpl Eq for ParseIntErrorimpl<Ret, A, B, C, D, E, F, G> Eq for extern "C" fn(A, B, C, D, E, F, G, ...) -> Retimpl Eq for LayoutErrimpl<Ret, A, B, C, D, E, F, G, H, I> Eq for fn(A, B, C, D, E, F, G, H, I) -> Retimpl<Idx> Eq for RangeInclusive<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 Reverse<T> where
T: Eq,impl<Ret, A, B, C, D, E, F> Eq for unsafe extern "C" fn(A, B, C, D, E, F) -> Retimpl Eq for charimpl Eq for NoneErrorimpl<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, D, E, F> Eq for fn(A, B, C, D, E, F) -> Retimpl Eq for usizeimpl<T> Eq for [T; 0] where
T: Eq,impl<T> Eq for [T; 4] where
T: Eq,impl<Ret, A> Eq for unsafe fn(A) -> Retimpl Eq for InvalidSequenceimpl<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 Errorimpl<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, 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 Eq for ParseCharErrorimpl<Ret, A, B> Eq for extern "C" fn(A, B) -> Retimpl<T> Eq for [T; 20] where
T: Eq,impl<T> Eq for [T; 25] where
T: Eq,impl<T> Eq for [T; 14] where
T: Eq,impl<T> Eq for [T; 17] where
T: Eq,impl Eq for u16impl<T> Eq for Discriminant<T>impl Eq for NonZeroU16impl<T> Eq for *mut T where
T: ?Sized,impl<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, 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, 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> Eq for unsafe fn(A, B, C, D, E) -> Retimpl Eq for NonZeroUsizeimpl<Idx> Eq for RangeFrom<Idx> where
Idx: Eq,impl<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; 6] where
T: Eq,impl<Idx> Eq for RangeTo<Idx> where
Idx: Eq,impl<Ret, A> Eq for unsafe extern "C" fn(A) -> Retimpl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E) -> Retimpl Eq for Durationimpl<Ret, A, B, C> Eq for unsafe fn(A, B, C) -> Retimpl<T> Eq for [T; 22] where
T: Eq,impl<T> Eq for Cell<T> where
T: Copy + Eq,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 Eq for isizeimpl Eq for NonZeroU8impl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for fn(A, B, C, D, E, F, G) -> Retimpl<H> Eq for BuildHasherDefault<H>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> Eq for extern "C" fn(A, B, C, D, E, F, G) -> Retimpl<Ret, A, B, C, D, E> Eq for fn(A, B, C, D, E) -> Retimpl Eq for AllocErrimpl Eq for i16impl Eq for i8impl<T> Eq for [T; 15] 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, 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 extern "C" fn(A, B, C, D, E, F, ...) -> Retimpl<Ret, A> Eq for fn(A) -> Retimpl Eq for NonZeroU128impl<T> Eq for [T; 28] 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 UnicodeVersionimpl<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 Eq for NonZeroU32impl<Ret> Eq for fn() -> Retimpl<T> Eq for [T; 18] where
T: Eq,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<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D, ...) -> Retimpl Eq for ParseBoolErrorimpl<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 Eq for CannotReallocInPlaceimpl<Ret, A, B> Eq for fn(A, B) -> Retimpl<T> Eq for [T; 9] 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<T> Eq for [T; 7] where
T: Eq,impl<A, B, C> Eq for (A, B, C) where
A: Eq,
B: Eq,
C: Eq + ?Sized,impl<T> Eq for [T; 8] where
T: Eq,impl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(A, B, C, D, E, ...) -> Retimpl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D, ...) -> Retimpl<Ret, A, B> Eq for unsafe extern "C" fn(A, B, ...) -> Retimpl<T> Eq for [T; 2] where
T: Eq,impl<Ret, A> Eq for extern "C" fn(A, ...) -> Retimpl<Idx> Eq for Range<Idx> where
Idx: Eq,impl<T> Eq for [T; 19] where
T: Eq,impl<T> Eq for [T; 16] where
T: Eq,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, G> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G) -> Retimpl<Ret> Eq for unsafe extern "C" fn() -> Retimpl<Ret, A, B, C, D, E, F, G, H> Eq for extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Retimpl<T> Eq for [T; 13] where
T: Eq,impl<T> Eq for [T] where
T: Eq,impl<T> Eq for ManuallyDrop<T> where
T: Eq,impl<A, B> Eq for (A, B) where
A: Eq,
B: Eq + ?Sized,impl<Ret, A, B> Eq for unsafe fn(A, B) -> Retimpl Eq for u8impl<T> Eq for [T; 31] where
T: Eq,impl<A> Eq for (A,) where
A: 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 RangeFullimpl Eq for CharTryFromErrorimpl<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<T> Eq for Wrapping<T> where
T: Eq,impl Eq for i32impl<T> Eq for [T; 21] where
T: Eq,impl<T> Eq for [T; 30] where
T: Eq,impl<Ret, A> Eq for unsafe extern "C" fn(A, ...) -> Retimpl Eq for Pinnedimpl<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> Eq for unsafe extern "C" fn(A, B, C, D, E) -> Retimpl Eq for Orderingimpl<T> Eq for [T; 24] where
T: Eq,impl Eq for TypeIdimpl<'a, A> Eq for &'a A where
A: Eq + ?Sized,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 Eq for FpCategoryimpl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C) -> Retimpl Eq for DecodeUtf16Errorimpl<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, K> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K) -> 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; 11] where
T: Eq,impl Eq for SearchStepimpl<Y, R> Eq for GeneratorState<Y, R> where
R: Eq,
Y: 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<T> Eq for NonNull<T> where
T: ?Sized,impl Eq for u64impl Eq for i64impl<Ret, A, B> Eq for extern "C" fn(A, B, ...) -> Retimpl<Ret> Eq for unsafe fn() -> 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 ()impl Eq for Utf8Errorimpl Eq for strimpl<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 unsafe fn(A, B, C, D) -> Retimpl<Idx> Eq for RangeToInclusive<Idx> where
Idx: Eq,impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D) -> Retimpl Eq for boolimpl<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<T> Eq for [T; 29] where
T: Eq,impl<T> Eq for [T; 3] where
T: Eq,impl<Ret, A, B, C> Eq for fn(A, B, C) -> Retimpl<T> Eq for [T; 32] 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; 1] where
T: Eq,impl Eq for Layoutimpl<Ret, A, B, C, D, E, F> Eq for unsafe extern "C" fn(A, B, C, D, E, F, ...) -> Retimpl<T> Eq for [T; 5] 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, 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 RefCell<T> where
T: Eq + ?Sized,impl<T> Eq for [T; 27] 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 Eq for i128impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C, ...) -> Retimpl<T> Eq for Bound<T> where
T: Eq,impl<T> Eq for [T; 10] where
T: Eq,impl<T> Eq for [T; 12] 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<T> Eq for *const T where
T: ?Sized,impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C) -> Retimpl Eq for NonZeroU64impl<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<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> Eq for fn(A, B, C, D) -> Retimpl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E, ...) -> Retimpl<T> Eq for PhantomData<T> where
T: ?Sized,impl<T> Eq for [T; 23] where
T: Eq,impl<T> Eq for Rc<T> where
T: Eq + ?Sized,impl<T> Eq for Arc<T> where
T: Eq + ?Sized,impl<T> Eq for Vec<T> where
T: Eq,impl<T> Eq for Box<T> where
T: Eq + ?Sized,impl Eq for Stringimpl<'a, B> Eq for Cow<'a, B> where
B: Eq + ToOwned + ?Sized,impl<T> Eq for LinkedList<T> where
T: Eq,impl Eq for ParseErrorimpl<A> Eq for VecDeque<A> where
A: Eq,impl<T> Eq for BTreeSet<T> where
T: Eq,impl<K, V> Eq for BTreeMap<K, V> where
K: Eq,
V: Eq,impl Eq for CollectionAllocErrimpl 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