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<T> Eq for NonZero<T> where
T: Zeroable + Eq, [src]
T: Zeroable + Eq,
impl Eq for InvalidSequence[src]
impl<'a> Eq for Utf8LossyChunk<'a>[src]
Implementors
impl<T> Eq for BTreeSet<T> where
T: Eq,impl Eq for Stringimpl Eq for Layoutimpl<T> Eq for Box<T> where
T: Eq + ?Sized,impl Eq for AllocErrimpl<T> Eq for Vec<T> where
T: Eq,impl Eq for CannotReallocInPlaceimpl Eq for ParseErrorimpl<T> Eq for Bound<T> where
T: Eq,impl<T> Eq for Arc<T> where
T: Eq + ?Sized,impl<'a, B> Eq for Cow<'a, B> where
B: Eq + ToOwned + ?Sized,impl<T> Eq for LinkedList<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<A> Eq for VecDeque<A> where
A: 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, 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> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Retimpl<Ret> Eq for fn() -> Retimpl Eq for ParseFloatErrorimpl<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> Eq for extern "C" fn(A, B, C, D, E, F, G) -> Retimpl<T> Eq for [T; 22] 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 extern "C" fn(A, B, C, D, E, F, G, H, I) -> Retimpl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D, ...) -> Retimpl<T> Eq for [T; 4] where
T: Eq,impl<Ret, A, B, C, D, E, F> Eq for unsafe extern "C" fn(A, B, C, D, E, F) -> Retimpl<T> Eq for [T; 17] where
T: Eq,impl<T> Eq for PhantomData<T> where
T: ?Sized,impl<Ret, A, B> Eq for unsafe fn(A, B) -> Retimpl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E) -> Retimpl<T> Eq for *mut T where
T: ?Sized,impl<T> Eq for [T; 16] where
T: Eq,impl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C, ...) -> 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 strimpl<Ret, A, B, C, D, E, F, G> Eq for extern "C" fn(A, B, C, D, E, F, G, ...) -> Retimpl<Idx> Eq for Range<Idx> where
Idx: Eq,impl Eq for ParseIntErrorimpl<T> Eq for [T; 20] 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 ManuallyDrop<T> where
T: Eq,impl Eq for i64impl<Ret, A, B, C, D> Eq for unsafe fn(A, B, C, D) -> Retimpl<T> Eq for [T; 14] where
T: Eq,impl Eq for u16impl<A, B> Eq for (A, B) where
A: Eq,
B: Eq + ?Sized,impl<Ret, A, B, C, D, E> Eq for fn(A, B, C, D, E) -> Retimpl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D) -> Retimpl<T> Eq for [T; 10] 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<Ret, A, B> Eq for unsafe extern "C" fn(A, B) -> 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> Eq for unsafe fn(A, B, C, D, E) -> Retimpl<T> Eq for [T; 15] where
T: Eq,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 Eq for isizeimpl<T> Eq for [T; 32] 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> Eq for fn(A, B) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Eq for extern "C" fn(A, B, C, D, E, F, G, H) -> Retimpl<A> Eq for (A,) where
A: Eq + ?Sized,impl Eq for !impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C, ...) -> Retimpl Eq for boolimpl<T> Eq for [T; 24] where
T: Eq,impl<T> Eq for [T; 21] where
T: Eq,impl<T> Eq for [T; 13] 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<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 extern "C" fn(A, ...) -> Retimpl<Ret> Eq for unsafe extern "C" fn() -> Retimpl<Ret, A, B, C, D, E, F> Eq for fn(A, B, C, D, E, F) -> Retimpl<T> Eq for [T; 2] where
T: Eq,impl<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; 30] where
T: Eq,impl<T> Eq for [T; 5] where
T: Eq,impl Eq for NoneErrorimpl Eq for ()impl<Y, R> Eq for GeneratorState<Y, R> where
R: Eq,
Y: Eq,impl Eq for i16impl<T> Eq for [T; 26] where
T: Eq,impl<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, 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 Discriminant<T>impl<Ret, A, B, C> Eq for 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; 27] where
T: Eq,impl<T> Eq for [T; 28] where
T: Eq,impl<Ret, A, B> Eq for extern "C" fn(A, B) -> Retimpl<T> Eq for [T; 18] 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, 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<T> Eq for [T; 11] where
T: Eq,impl<Ret, A, B> Eq for unsafe extern "C" fn(A, B, ...) -> Retimpl<'a, A> Eq for &'a A where
A: Eq + ?Sized,impl Eq for Infallibleimpl<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 FpCategoryimpl<Ret> Eq for unsafe fn() -> Retimpl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E, ...) -> Retimpl<T> Eq for [T; 1] where
T: Eq,impl<Ret, A, B> Eq for extern "C" fn(A, B, ...) -> Retimpl<T> Eq for Wrapping<T> where
T: Eq,impl<Ret, A> Eq for unsafe fn(A) -> Retimpl<Idx> Eq for RangeInclusive<Idx> where
Idx: Eq,impl<A, B, C> Eq for (A, B, C) where
A: Eq,
B: Eq,
C: Eq + ?Sized,impl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C) -> Retimpl<T> Eq for [T; 6] 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<Ret, A> Eq for unsafe extern "C" fn(A) -> Retimpl<T> Eq for [T; 8] where
T: Eq,impl<Ret, A> Eq for unsafe extern "C" fn(A, ...) -> Retimpl<Ret> Eq for extern "C" fn() -> Retimpl<T> Eq for [T; 9] where
T: Eq,impl Eq for u64impl<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 Eq for i32impl<T> Eq for [T; 0] where
T: Eq,impl<T> Eq for Cell<T> where
T: Copy + 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, G> Eq for unsafe fn(A, B, C, D, E, F, G) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for fn(A, B, C, D, E, F, G) -> Retimpl Eq for i8impl Eq for charimpl<T> Eq for [T; 25] where
T: Eq,impl<T> Eq for [T] where
T: Eq,impl Eq for SearchStepimpl Eq for Utf8Errorimpl Eq for TypeIdimpl<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; 31] 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 Orderingimpl<T> Eq for [T; 7] where
T: Eq,impl<T> Eq for [T; 23] where
T: Eq,impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D, ...) -> 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<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<'a, A> Eq for &'a mut A where
A: Eq + ?Sized,impl Eq for Errorimpl<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<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, 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 fn(A, B, C, D, E, F, G, H, I, J) -> 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> Eq for extern "C" 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, 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 i128impl<Idx> Eq for RangeTo<Idx> where
Idx: Eq,impl<Ret, A, B, C> Eq for unsafe fn(A, B, C) -> Retimpl<T> Eq for [T; 29] 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<T> Eq for Reverse<T> where
T: Eq,impl<T> Eq for Option<T> where
T: Eq,impl<T> Eq for [T; 19] where
T: Eq,impl Eq for u32impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C) -> Retimpl<T> Eq for [T; 3] where
T: Eq,impl<Idx> Eq for RangeToInclusive<Idx> where
Idx: Eq,impl Eq for u128impl<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<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> Eq for unsafe extern "C" fn(A, B, C, D) -> Retimpl<Ret, A, B, C, D> Eq for 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<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> Eq for extern "C" fn(A) -> Retimpl Eq for CharTryFromErrorimpl<Ret, A, B, C, D, E, F> Eq for unsafe fn(A, B, C, D, E, F) -> Retimpl<T> Eq for RefCell<T> where
T: 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 usizeimpl Eq for RangeFullimpl Eq for ParseBoolErrorimpl<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, J, K> Eq for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, ...) -> Retimpl<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<T> Eq for *const T where
T: ?Sized,impl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(A, B, C, D, E, F, ...) -> Retimpl<Idx> Eq for RangeFrom<Idx> where
Idx: Eq,impl Eq for DecodeUtf16Errorimpl Eq for UnicodeVersionimpl 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