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