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 Eq for Layoutimpl<T> Eq for [T; 2] where
T: Eq,impl Eq for i64impl Eq for u32x2impl<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<T> Eq for Poll<T> where
T: Eq,impl Eq for i16x4impl Eq for u16x16impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D) -> Retimpl Eq for i8impl<T> Eq for [T; 27] where
T: Eq,impl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(A, B, C, D, E, F, ...) -> Retimpl Eq for m1x64impl<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 Eq for u8impl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe fn(A, B, C, D, E, F, G, H) -> Retimpl Eq for isizeimpl Eq for i32x4impl<T> Eq for [T; 1] where
T: Eq,impl<T> Eq for *const T where
T: ?Sized,impl<Ret> Eq for extern "C" fn() -> Retimpl Eq for DecodeUtf16Errorimpl Eq for u32x4impl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C, ...) -> Retimpl Eq for AllocErrimpl<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 extern "C" fn(A, B, C, D, E, F, G, H, I, ...) -> Retimpl<Ret> Eq for fn() -> 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 Eq for ParseIntErrorimpl Eq for RangeFullimpl Eq for u8x64impl<T> Eq for [T; 6] where
T: Eq,impl<Y, R> Eq for GeneratorState<Y, R> where
R: Eq,
Y: Eq,impl Eq for i8x4impl<T> Eq for [T; 8] where
T: Eq,impl Eq for ParseBoolErrorimpl Eq for m32x8impl<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 i32x2impl<T> Eq for [T; 16] where
T: Eq,impl Eq for i32x16impl Eq for u8x2impl Eq for NonZeroU16impl<T> Eq for [T; 10] where
T: Eq,impl<A, B, C, D> Eq for (A, B, C, D) where
A: Eq,
B: Eq,
C: Eq,
D: Eq + ?Sized,impl Eq for m64x2impl<Ret, A, B> Eq for unsafe extern "C" fn(A, B) -> Retimpl Eq for m16x8impl<T> Eq for [T; 3] where
T: Eq,impl<Ret, A> Eq for unsafe fn(A) -> Retimpl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C) -> Retimpl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(A, B, C, D, E, F) -> Retimpl<Idx> Eq for RangeTo<Idx> where
Idx: 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 [T; 20] where
T: Eq,impl<T> Eq for [T; 29] where
T: Eq,impl<A, B, C> Eq for (A, B, C) where
A: Eq,
B: Eq,
C: Eq + ?Sized,impl Eq for i16x16impl<Ret, A, B, C, D> Eq for unsafe fn(A, B, C, D) -> Retimpl<T> Eq for Cell<T> where
T: Copy + Eq,impl Eq for strimpl<T> Eq for [T; 4] where
T: Eq,impl Eq for i64x8impl<Ret, A, B, C, D, E> Eq for 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<A, B> Eq for (A, B) where
A: Eq,
B: Eq + ?Sized,impl Eq for u8x4impl<A> Eq for (A,) where
A: Eq + ?Sized,impl Eq for i8x2impl Eq for m32x4impl<T> Eq for Discriminant<T>impl<T> Eq for [T; 25] where
T: Eq,impl Eq for u64x2impl<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> Eq for unsafe extern "C" fn(A, B, C, D, ...) -> Retimpl Eq for m64x4impl<'a, A> Eq for &'a mut A where
A: Eq + ?Sized,impl<T> Eq for ManuallyDrop<T> where
T: Eq,impl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E) -> Retimpl<T> Eq for [T; 7] where
T: Eq,impl<Idx> Eq for Range<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<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 m1x8impl<T> Eq for [T; 15] where
T: Eq,impl Eq for u16impl Eq for usizeimpl Eq for i8x8impl<Ret, A> Eq for 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, D, E, F, G> Eq for extern "C" fn(A, B, C, D, E, F, G) -> Retimpl Eq for charimpl Eq for m1x32impl<Ret> Eq for unsafe fn() -> Retimpl<Idx> Eq for RangeToInclusive<Idx> where
Idx: Eq,impl Eq for u32impl Eq for NonZeroUsizeimpl<Ret, A, B, C, D, E> Eq for unsafe fn(A, B, C, D, E) -> Retimpl Eq for Durationimpl<Idx> Eq for RangeInclusive<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 Eq for u64x8impl<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, I, J> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I, J, ...) -> Retimpl Eq for u16x8impl Eq for Pinnedimpl Eq for u8x32impl Eq for i32impl Eq for CannotReallocInPlaceimpl<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> Eq for extern "C" fn(A, B, ...) -> Retimpl<T> Eq for *mut T where
T: ?Sized,impl Eq for m8x32impl Eq for m1x16impl<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 NonZeroU128impl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D, ...) -> Retimpl<T> Eq for Reverse<T> where
T: Eq,impl Eq for u16x4impl Eq for boolimpl Eq for i8x64impl<Ret, A, B> Eq for unsafe extern "C" fn(A, B, ...) -> Retimpl<Ret, A, B> Eq for fn(A, B) -> Retimpl<T> Eq for [T; 13] where
T: Eq,impl Eq for !impl<T> Eq for [T; 22] where
T: Eq,impl<T> Eq for Wrapping<T> where
T: Eq,impl Eq for i128impl<T> Eq for Option<T> where
T: Eq,impl<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 u16x32impl<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> Eq for unsafe extern "C" fn() -> Retimpl Eq for u64x4impl Eq for i16x32impl<T> Eq for [T; 12] where
T: Eq,impl<T> Eq for [T; 28] where
T: Eq,impl Eq for FpCategoryimpl Eq for m8x4impl<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> Eq for extern "C" fn(A, ...) -> Retimpl<T> Eq for [T; 19] where
T: Eq,impl Eq for m16x4impl<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> Eq for extern "C" fn(A, B, C) -> Retimpl<T> Eq for PhantomData<T> where
T: ?Sized,impl Eq for NonZeroU8impl<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 m32x2impl<Idx> Eq for RangeFrom<Idx> where
Idx: Eq,impl Eq for i8x16impl<'a, A> Eq for &'a A where
A: Eq + ?Sized,impl Eq for u32x8impl<T> Eq for [T; 26] where
T: Eq,impl<Ret, A, B, C, D, E> Eq for fn(A, B, C, D, E) -> Retimpl<T> Eq for [T; 21] where
T: Eq,impl<T> Eq for RefCell<T> where
T: Eq + ?Sized,impl Eq for NoneErrorimpl Eq for LayoutErrimpl Eq for CharTryFromErrorimpl Eq for CollectionAllocErrimpl<T> Eq for [T] where
T: Eq,impl Eq for u32x16impl<Ret, A, B> Eq for unsafe fn(A, B) -> Retimpl<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 u8x16impl<T> Eq for [T; 11] where
T: Eq,impl<Ret, A, B, C> Eq for fn(A, B, C) -> Retimpl<T> Eq for [T; 14] where
T: Eq,impl<T> Eq for [T; 18] where
T: Eq,impl Eq for u128impl Eq for m16x16impl Eq for Errorimpl Eq for NonZeroU64impl Eq for u8x8impl<T> Eq for NonNull<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 unsafe fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Retimpl Eq for ParseCharErrorimpl<T, E> Eq for Result<T, E> where
E: Eq,
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 Utf8Errorimpl Eq for m8x16impl<Ret, A, B, C> Eq for unsafe fn(A, B, C) -> Retimpl Eq for m16x2impl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(A, B, C, D, E, ...) -> Retimpl Eq for u16x2impl<T> Eq for [T; 0] 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, H, I> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I) -> Retimpl<Ret, A> Eq for extern "C" fn(A) -> 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, F, G> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, ...) -> Retimpl<Ret, A> Eq for unsafe 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> Eq for extern "C" fn(A, B) -> Retimpl Eq for SearchStepimpl Eq for i64x4impl<T> Eq for [T; 17] where
T: Eq,impl Eq for i8x32impl Eq for i16x2impl Eq for i64x2impl<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, K, L> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L, ...) -> Retimpl Eq for UnicodeVersionimpl<Ret, A> Eq for unsafe extern "C" fn(A, ...) -> Retimpl<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 ()impl<Ret, A, B, C, D, E, F, G> Eq for fn(A, B, C, D, E, F, G) -> Retimpl<Ret, A, B, C> Eq for extern "C" fn(A, B, C, ...) -> Retimpl Eq for i16x8impl<T> Eq for [T; 30] 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> Eq for unsafe extern "C" fn(A, B, C, D, E, F, ...) -> Retimpl Eq for TypeIdimpl<T> Eq for [T; 31] 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> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H) -> Retimpl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(A, B, C, D, E) -> Retimpl Eq for NonZeroU32impl<T> Eq for [T; 5] where
T: Eq,impl<T> Eq for [T; 9] where
T: Eq,impl Eq for ParseFloatErrorimpl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D) -> Retimpl Eq for u64impl<Ret, A, B, C, D> Eq for fn(A, B, C, D) -> Retimpl Eq for m8x2impl<T> Eq for [T; 24] 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 Eq for Orderingimpl Eq for i32x8impl<T> Eq for Bound<T> where
T: 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<T> Eq for [T; 32] where
T: Eq,impl Eq for i16impl Eq for InvalidSequenceimpl Eq for m8x8impl<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, 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> Eq for fn(A, B, C, D, E, F, G, H) -> 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> Eq for extern "C" fn(A, B, C, D, E, F, G, ...) -> 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<A> Eq for VecDeque<A> where
A: Eq,impl<K, V> Eq for BTreeMap<K, V> where
K: Eq,
V: 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<T> Eq for Arc<T> where
T: Eq + ?Sized,impl Eq for ParseErrorimpl<T> Eq for Box<T> where
T: Eq + ?Sized,impl<T> Eq for BTreeSet<T> where
T: Eq,impl Eq for Stringimpl<T> Eq for LinkedList<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