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<T> Eq for NonZero<T> where
T: Zeroable + Eq, [src]
T: Zeroable + Eq,
impl Eq for InvalidSequence[src]
Implementors
impl Eq for DecodeUtf16Errorimpl Eq for UnicodeVersionimpl<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 PhantomData<T> where
T: ?Sized,impl Eq for ()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 boolimpl Eq for charimpl<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 Discriminant<T>impl<T> Eq for [T; 2] where
T: Eq,impl<T> Eq for [T; 5] where
T: Eq,impl<Idx> Eq for Range<Idx> where
Idx: Eq,impl<T> Eq for [T; 17] where
T: Eq,impl<T> Eq for [T] where
T: Eq,impl<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> Eq for unsafe fn(A, B, C, D, E, F, G, H, I) -> 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> Eq for extern "C" fn(A, B, C, D, E, F, G, ...) -> Retimpl<T> Eq for [T; 6] where
T: Eq,impl<T> Eq for [T; 15] where
T: Eq,impl<T> Eq for [T; 11] 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<T> Eq for Reverse<T> where
T: Eq,impl<Ret, A, B, C, D> Eq for unsafe fn(A, B, C, D) -> Retimpl<T> Eq for [T; 1] 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, I, J, K> Eq for fn(A, B, C, D, E, F, G, H, I, J, K) -> Retimpl<T> Eq for *mut T where
T: ?Sized,impl<T> Eq for [T; 16] 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; 13] where
T: Eq,impl<Ret> Eq for unsafe fn() -> Retimpl<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, E> Eq for Result<T, E> where
E: Eq,
T: Eq,impl<T> Eq for [T; 30] where
T: Eq,impl Eq for u16impl<Ret, A, B, C, D, E, F> Eq for fn(A, B, C, D, E, F) -> Retimpl<T> Eq for RefCell<T> where
T: Eq + ?Sized,impl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D, ...) -> Retimpl<Ret, A, B> Eq for extern "C" 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<Ret, A, B, C, D, E, F> Eq for unsafe fn(A, B, C, D, E, F) -> Retimpl<T> Eq for [T; 3] where
T: Eq,impl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C, ...) -> Retimpl<T> Eq for [T; 8] where
T: Eq,impl<Ret> Eq for unsafe extern "C" fn() -> Retimpl<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; 29] where
T: Eq,impl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(A, B, C, D, E, F) -> Retimpl<T> Eq for [T; 27] where
T: Eq,impl Eq for TypeIdimpl<Idx> Eq for RangeTo<Idx> where
Idx: Eq,impl<Ret, A, B> Eq for unsafe extern "C" fn(A, B, ...) -> Retimpl<T> Eq for Wrapping<T> where
T: Eq,impl<Ret, A, B, C> Eq for unsafe fn(A, B, C) -> Retimpl<T> Eq for [T; 22] 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<'a, A> Eq for &'a A where
A: Eq + ?Sized,impl<T> Eq for [T; 21] 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, 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> Eq for extern "C" 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, 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 Infallibleimpl Eq for CharTryFromErrorimpl<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 [T; 18] 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<T> Eq for [T; 32] where
T: Eq,impl<T> Eq for *const T where
T: ?Sized,impl Eq for u64impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C) -> Retimpl<Ret, A, B, C, D> Eq for fn(A, B, C, D) -> Retimpl<T> Eq for [T; 4] where
T: Eq,impl<Ret> Eq for extern "C" fn() -> Retimpl Eq for Utf8Errorimpl Eq for FpCategoryimpl<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; 14] where
T: Eq,impl<T> Eq for [T; 25] 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, E> Eq for fn(A, B, C, D, E) -> Retimpl<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, 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, 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> 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 [T; 19] where
T: Eq,impl Eq for u128impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D) -> Retimpl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E) -> Retimpl<Ret, A> Eq for unsafe extern "C" fn(A) -> Retimpl Eq for RangeFullimpl Eq for !impl<T> Eq for [T; 0] 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<T> Eq for [T; 24] where
T: Eq,impl<T> Eq for [T; 7] where
T: Eq,impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C, ...) -> Retimpl<T> Eq for ManuallyDrop<T> where
T: Eq,impl Eq for isizeimpl Eq for NoneErrorimpl<T> Eq for [T; 23] where
T: Eq,impl<T> Eq for Cell<T> where
T: Copy + Eq,impl Eq for i64impl<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 i32impl Eq for i128impl<Ret, A> Eq for unsafe fn(A) -> Retimpl<A> Eq for (A,) where
A: Eq + ?Sized,impl<'a, A> Eq for &'a mut A where
A: Eq + ?Sized,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> Eq for unsafe extern "C" fn(A, B, C, D, E) -> Retimpl Eq for Errorimpl Eq for usizeimpl<T> Eq for [T; 28] where
T: Eq,impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D, ...) -> Retimpl<Ret> Eq for fn() -> 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> Eq for fn(A) -> 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<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> 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 unsafe fn(A, B, C, D, E, F, G) -> Retimpl<Ret, A> Eq for extern "C" fn(A) -> Retimpl<T> Eq for [T; 26] where
T: Eq,impl<T> Eq for [T; 31] 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, 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<Y, R> Eq for GeneratorState<Y, R> where
R: Eq,
Y: Eq,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<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> Eq for extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G) -> Retimpl Eq for strimpl<A, B> Eq for (A, B) where
A: Eq,
B: Eq + ?Sized,impl<Idx> Eq for RangeInclusive<Idx> where
Idx: Eq,impl<Ret, A> Eq for unsafe extern "C" fn(A, ...) -> Retimpl Eq for u32impl<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 extern "C" fn(A, B, C, D, E, F, G, H, I, J) -> Retimpl<Ret, A, B> Eq for fn(A, B) -> Retimpl<Idx> Eq for RangeFrom<Idx> where
Idx: Eq,impl<Ret, A, B, C, D, E, F, G> Eq for fn(A, B, C, D, E, F, G) -> Retimpl<Ret, A, B> Eq for extern "C" fn(A, B, ...) -> Retimpl Eq for i8impl<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> Eq for 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<Ret, A, B, C> Eq for fn(A, B, C) -> Retimpl<Ret, A, B, C, D, E> Eq for unsafe fn(A, B, C, D, E) -> Retimpl<T> Eq for [T; 10] where
T: Eq,impl Eq for i16impl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C) -> Retimpl Eq for SearchStepimpl<T> Eq for Option<T> where
T: Eq,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<Ret, A, B> Eq for unsafe fn(A, B) -> Retimpl Eq for ParseFloatErrorimpl<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<Idx> Eq for RangeToInclusive<Idx> where
Idx: Eq,impl Eq for ParseBoolErrorimpl Eq for ParseIntErrorimpl<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 Orderingimpl<Ret, A, B> Eq for unsafe extern "C" fn(A, B) -> Retimpl<T> Eq for [T; 20] where
T: Eq,impl<T> Eq for [T; 9] where
T: Eq,impl Eq for ParseErrorimpl<T> Eq for Vec<T> where
T: Eq,impl<T> Eq for Rc<T> where
T: Eq + ?Sized,impl<K, V> Eq for BTreeMap<K, V> where
K: Eq,
V: Eq,impl Eq for Layoutimpl Eq for Stringimpl<T> Eq for Box<T> where
T: Eq + ?Sized,impl<A> Eq for VecDeque<A> where
A: Eq,impl<T> Eq for LinkedList<T> where
T: Eq,impl<T> Eq for BTreeSet<T> where
T: Eq,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 AllocErrimpl<T> Eq for Bound<T> where
T: Eq,impl Eq for CannotReallocInPlaceimpl 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