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 == b
impliesb == a
; and - transitive:
a == b
andb == c
impliesa == 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 derive
d, 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<A, B> Eq for (A, B) where
A: Eq,
B: Eq + ?Sized,impl Eq for i128
impl<T> Eq for [T; 18] where
T: Eq,impl Eq for i32
impl<Ret, A> Eq for unsafe extern "C" fn(A) -> Ret
impl<T> Eq for [T; 15] where
T: Eq,impl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(A, B, C, D, E, F, ...) -> Ret
impl<T> Eq for [T; 19] where
T: Eq,impl Eq for ()
impl Eq for ParseBoolError
impl<T> Eq for [T; 20] where
T: Eq,impl Eq for LayoutErr
impl Eq for !
impl<Ret, A, B, C, D, E, F, G, H, I, J> Eq for fn(A, B, C, D, E, F, G, H, I, J) -> Ret
impl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(A, B, C, D, E, F) -> Ret
impl Eq for FpCategory
impl<Ret, A, B, C, D, E, F, G, H> Eq for extern "C" fn(A, B, C, D, E, F, G, H) -> Ret
impl<T> Eq for NonNull<T> where
T: ?Sized,impl<Ret, A, B, C, D, E, F, G> Eq for unsafe fn(A, B, C, D, E, F, G) -> Ret
impl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D, ...) -> Ret
impl<Ret, A, B, C, D, E, F> Eq for unsafe extern "C" fn(A, B, C, D, E, F) -> Ret
impl<T> Eq for [T; 2] where
T: Eq,impl Eq for TypeId
impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C) -> Ret
impl Eq for char
impl<T> Eq for Wrapping<T> where
T: Eq,impl Eq for AllocErr
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) -> Ret
impl<T> Eq for [T; 21] where
T: Eq,impl<T> Eq for Bound<T> where
T: Eq,impl<Ret, A> Eq for extern "C" fn(A) -> Ret
impl Eq for ParseFloatError
impl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D) -> Ret
impl Eq for u128
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; 8] where
T: Eq,impl Eq for CharTryFromError
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, ...) -> Ret
impl<Ret, A, B, C, D, E, F, G> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, ...) -> Ret
impl<T> Eq for [T; 27] where
T: Eq,impl Eq for CannotReallocInPlace
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) -> Ret
impl<T> Eq for [T; 28] where
T: Eq,impl<Idx> Eq for RangeInclusive<Idx> where
Idx: Eq,impl<T> Eq for RefCell<T> where
T: Eq + ?Sized,impl Eq for u64
impl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Ret
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, ...) -> Ret
impl<T> Eq for [T; 12] where
T: Eq,impl<Ret, A, B, C, D, E, F, G> Eq for extern "C" fn(A, B, C, D, E, F, G, ...) -> Ret
impl<Ret, A, B> Eq for unsafe extern "C" fn(A, B, ...) -> Ret
impl<T> Eq for [T; 7] where
T: Eq,impl Eq for Layout
impl<T> Eq for [T] where
T: Eq,impl Eq for ParseIntError
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, ...) -> Ret
impl<Ret, A, B, C, D, E, F, G, H, I> Eq for fn(A, B, C, D, E, F, G, H, I) -> Ret
impl<Ret, A, B, C, D, E, F, G, H> Eq for fn(A, B, C, D, E, F, G, H) -> Ret
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) -> Ret
impl<T> Eq for PhantomData<T> where
T: ?Sized,impl<T> Eq for [T; 23] where
T: Eq,impl Eq for NonZeroU128
impl<Ret, A, B, C, D, E, F, G, H, I> Eq for unsafe fn(A, B, C, D, E, F, G, H, I) -> Ret
impl<T> Eq for *mut T where
T: ?Sized,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<T> Eq for [T; 11] where
T: Eq,impl<T> Eq for [T; 13] where
T: Eq,impl<Ret, A, B, C, D, E> Eq for fn(A, B, C, D, E) -> Ret
impl<T> Eq for Poll<T> where
T: Eq,impl<T> Eq for [T; 31] 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 Eq for isize
impl<Ret, A, B, C, D> Eq for fn(A, B, C, D) -> Ret
impl Eq for Duration
impl Eq for NoneError
impl<T> Eq for [T; 1] 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, ...) -> Ret
impl<Ret, A> Eq for extern "C" fn(A, ...) -> Ret
impl<T> Eq for [T; 32] where
T: Eq,impl<T> Eq for [T; 24] where
T: Eq,impl Eq for RangeFull
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, ...) -> Ret
impl<Ret, A, B> Eq for unsafe fn(A, B) -> Ret
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) -> Ret
impl<T> Eq for [T; 29] where
T: Eq,impl Eq for Utf8Error
impl Eq for InvalidSequence
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) -> Ret
impl Eq for NonZeroU64
impl<T> Eq for [T; 17] 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<H> Eq for BuildHasherDefault<H>
impl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E, ...) -> Ret
impl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(A, B, C, D, E, ...) -> Ret
impl Eq for u16
impl Eq for usize
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; 22] where
T: Eq,impl<T> Eq for *const T where
T: ?Sized,impl<T> Eq for [T; 26] where
T: Eq,impl<T> Eq for Cell<T> where
T: Copy + Eq,impl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C) -> Ret
impl Eq for SearchStep
impl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H) -> Ret
impl<Ret, A, B, C> Eq for fn(A, B, C) -> Ret
impl<T> Eq for [T; 3] where
T: Eq,impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D) -> Ret
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<Y, R> Eq for GeneratorState<Y, R> where
R: Eq,
Y: 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) -> Ret
impl<Ret, A, B, C, D, E, F> Eq for unsafe fn(A, B, C, D, E, F) -> Ret
impl Eq for Pinned
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<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) -> Ret
impl<T> Eq for [T; 4] where
T: 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) -> Ret
impl<Ret> Eq for extern "C" fn() -> Ret
impl Eq for i64
impl<Ret> Eq for fn() -> Ret
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, ...) -> Ret
impl<Ret, A, B, C, D, E, F> Eq for fn(A, B, C, D, E, F) -> Ret
impl<T> Eq for [T; 0] where
T: Eq,impl Eq for i16
impl<'a, A> Eq for &'a mut A where
A: Eq + ?Sized,impl<Ret, A, B> Eq for unsafe extern "C" fn(A, B) -> Ret
impl<Idx> Eq for RangeToInclusive<Idx> where
Idx: Eq,impl<T> Eq for Discriminant<T>
impl Eq for str
impl Eq for u8
impl<Ret, A, B> Eq for extern "C" fn(A, B) -> Ret
impl<Ret, A, B, C> Eq for unsafe fn(A, B, C) -> Ret
impl Eq for NonZeroU32
impl<T> Eq for Option<T> where
T: Eq,impl Eq for Ordering
impl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E) -> Ret
impl<Ret, A, B, C, D, E, F, G> Eq for extern "C" fn(A, B, C, D, E, F, G) -> Ret
impl<Ret, A, B, C, D, E, F> Eq for unsafe extern "C" fn(A, B, C, D, E, F, ...) -> Ret
impl<Ret, A, B, C, D> Eq for unsafe fn(A, B, C, D) -> Ret
impl Eq for bool
impl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(A, B, C, D, E) -> Ret
impl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe fn(A, B, C, D, E, F, G, H) -> Ret
impl<Ret, A, B> Eq for fn(A, B) -> Ret
impl<T> Eq for [T; 5] where
T: Eq,impl Eq for i8
impl<T> Eq for [T; 9] where
T: Eq,impl<Ret, A> Eq for fn(A) -> Ret
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) -> Ret
impl<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) -> Ret
impl<Idx> Eq for Range<Idx> where
Idx: 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) -> Ret
impl<Ret> Eq for unsafe fn() -> Ret
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<A> Eq for (A,) where
A: Eq + ?Sized,impl<Ret, A, B> Eq for extern "C" fn(A, B, ...) -> Ret
impl<T> Eq for Reverse<T> where
T: Eq,impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C, ...) -> Ret
impl<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> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G) -> Ret
impl<Idx> Eq for RangeTo<Idx> where
Idx: 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) -> Ret
impl<T> Eq for [T; 16] 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, ...) -> Ret
impl<T> Eq for [T; 30] where
T: Eq,impl<Ret, A> Eq for unsafe extern "C" fn(A, ...) -> Ret
impl<T> Eq for [T; 10] where
T: Eq,impl Eq for u32
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, ...) -> Ret
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) -> Ret
impl<T, E> Eq for Result<T, E> where
E: Eq,
T: Eq,impl Eq for UnicodeVersion
impl<Ret, A, B, C, D, E, F, G> Eq for fn(A, B, C, D, E, F, G) -> Ret
impl<T> Eq for [T; 6] where
T: Eq,impl Eq for DecodeUtf16Error
impl<T> Eq for [T; 14] where
T: Eq,impl<'a, A> Eq for &'a A where
A: Eq + ?Sized,impl<Ret, A, B, C, D, E> Eq for unsafe fn(A, B, C, D, E) -> Ret
impl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C, ...) -> Ret
impl Eq for NonZeroU8
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, ...) -> Ret
impl Eq for ParseCharError
impl Eq for NonZeroUsize
impl<Idx> Eq for RangeFrom<Idx> where
Idx: Eq,impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D, ...) -> Ret
impl<T> Eq for ManuallyDrop<T> where
T: Eq,impl<Ret> Eq for unsafe extern "C" fn() -> Ret
impl Eq for Error
impl Eq for NonZeroU16
impl<A, B, C> Eq for (A, B, C) where
A: Eq,
B: Eq,
C: Eq + ?Sized,impl<T> Eq for [T; 25] where
T: Eq,impl<Ret, A> Eq for unsafe fn(A) -> Ret
impl Eq for ParseError
impl Eq for String
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 Vec<T> where
T: Eq,impl<K, V> Eq for BTreeMap<K, V> where
K: Eq,
V: Eq,impl<T> Eq for Box<T> where
T: Eq + ?Sized,impl<T> Eq for Arc<T> where
T: Eq + ?Sized,impl<T> Eq for Rc<T> where
T: Eq + ?Sized,impl<T> Eq for LinkedList<T> where
T: Eq,impl Eq for CollectionAllocErr
impl<A> Eq for VecDeque<A> where
A: Eq,impl Eq for ThreadId
impl<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 VarError
impl Eq for CString
impl Eq for NulError
impl Eq for FromBytesWithNulError
impl Eq for IntoStringError
impl Eq for CStr
impl Eq for OsString
impl Eq for OsStr
impl Eq for Permissions
impl Eq for FileType
impl Eq for ErrorKind
impl Eq for SeekFrom
impl Eq for IpAddr
impl Eq for Ipv6MulticastScope
impl Eq for Ipv4Addr
impl Eq for Ipv6Addr
impl Eq for SocketAddr
impl Eq for SocketAddrV4
impl Eq for SocketAddrV6
impl Eq for AddrParseError
impl Eq for Shutdown
impl<'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 PathBuf
impl Eq for StripPrefixError
impl Eq for Path
impl Eq for Output
impl Eq for ExitStatus
impl<T: Eq> Eq for SendError<T>
impl Eq for RecvError
impl Eq for TryRecvError
impl Eq for RecvTimeoutError
impl<T: Eq> Eq for TrySendError<T>
impl Eq for WaitTimeoutResult
impl Eq for Instant
impl Eq for SystemTime