Trait scale_info::prelude::cmp::Eq

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 implies b == a; and
• transitive: a == b and b == c implies a == 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: &Self) -> bool {
        self.isbn == other.isbn
    }
}
impl Eq for Book {}

Implementations on Foreign Types

impl Eq for Instant

impl Eq for Ipv4Addr

impl Eq for ErrorKind

impl Eq for ThreadId

impl Eq for FromVecWithNulError

impl Eq for ExitStatus

impl Eq for SocketAddrV6

impl Eq for FileType

impl Eq for TryRecvError

impl Eq for Shutdown

impl Eq for SocketAddr

impl<'a> Eq for Prefix<'a>

impl<'a> Eq for PrefixComponent<'a>

impl Eq for CString

impl Eq for Ipv6Addr

impl Eq for FromBytesWithNulError

impl Eq for BacktraceStatus

impl Eq for VarError

impl Eq for Path

impl Eq for IpAddr

impl Eq for IntoStringError

impl Eq for OsStr

impl Eq for WaitTimeoutResult

impl Eq for SocketAddrV4

impl<'a> Eq for Component<'a>

impl Eq for StripPrefixError

impl Eq for CStr

impl Eq for SeekFrom

impl Eq for OsString

impl Eq for AddrParseError

impl Eq for Ipv6MulticastScope

impl<'_> Eq for Components<'_>

impl Eq for NulError

impl Eq for PathBuf

impl<T> Eq for SendError<T> where
    T: Eq, 

impl Eq for AccessError

impl Eq for Permissions

impl<T> Eq for SyncOnceCell<T> where
    T: Eq, 

impl Eq for Output

impl<T> Eq for TrySendError<T> where
    T: Eq, 

impl Eq for RecvError

impl Eq for SystemTime

impl<T> Eq for Cursor<T> where
    T: Eq, 

impl Eq for RecvTimeoutError

impl<A, B> Eq for (A, B) where
    A: Eq,
    B: Eq + ?Sized, 

impl<P> Eq for Pin<P> where
    P: Deref,
    <P as Deref>::Target: Eq, 

impl<Idx> Eq for RangeFrom<Idx> where
    Idx: Eq, 

impl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E, ...) -> Ret

impl<A, B, C, D> Eq for (A, B, C, D) where
    C: Eq,
    D: Eq + ?Sized,
    A: Eq,
    B: Eq, 

impl Eq for u32

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, 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> Eq for fn(A) -> Ret

impl<A> Eq for (A,) where
    A: Eq + ?Sized, 

impl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C) -> Ret

impl<Ret, A, B, C> Eq for fn(A, B, C) -> 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<'a> Eq for Location<'a>

impl<Ret, A, B, C, D> Eq for unsafe fn(A, B, C, D) -> Ret

impl Eq for Duration

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> Eq for unsafe fn(A) -> Ret

impl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E) -> Ret

impl Eq for i16

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 Eq for u128

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<A, B, C, D, E, F, G, H, I> Eq for (A, B, C, D, E, F, G, H, I) where
    C: Eq,
    D: Eq,
    F: Eq,
    I: Eq + ?Sized,
    A: Eq,
    B: Eq,
    E: Eq,
    G: Eq,
    H: 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) -> Ret

impl<T> Eq for RefCell<T> where
    T: Eq + ?Sized, 

impl<Ret, A, B> Eq for unsafe fn(A, B) -> Ret

impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C, ...) -> Ret

impl<T> Eq for Option<T> where
    T: Eq, 

impl<T> Eq for *mut T where
    T: ?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<Ret, A, B, C> Eq for extern "C" fn(A, B, C) -> Ret

impl<Ret> Eq for unsafe fn() -> Ret

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 CpuidResult

impl<T, const N: usize> Eq for [T; N] where
    T: Eq, 

impl Eq for u16

impl<Ret> Eq for fn() -> Ret

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<A, B, C, D, E, F> Eq for (A, B, C, D, E, F) where
    C: Eq,
    D: Eq,
    F: Eq + ?Sized,
    A: Eq,
    B: Eq,
    E: Eq, 

impl<Ret, A> Eq for unsafe extern "C" fn(A) -> Ret

impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D) -> Ret

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 Eq for DecodeUtf16Error

impl<Ret, A> Eq for extern "C" fn(A) -> Ret

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<Ret, A, B, C, D, E> Eq for unsafe fn(A, B, C, D, E) -> Ret

impl Eq for ParseCharError

impl<Ret, A, B, C, D, E, F, G> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, ...) -> 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<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 Eq for Ordering

impl Eq for LayoutError

impl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(A, B, C, D, E, F, ...) -> Ret

impl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(A, B, C, D, E, F) -> Ret

impl<A, B, C, D, E, F, G, H> Eq for (A, B, C, D, E, F, G, H) where
    C: Eq,
    D: Eq,
    F: Eq,
    A: Eq,
    B: Eq,
    E: Eq,
    G: Eq,
    H: Eq + ?Sized, 

impl Eq for CharTryFromError

impl Eq for str

impl<'a> Eq for Utf8LossyChunk<'a>

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 Eq for i128

impl<A, B, C, D, E, F, G, H, I, J> Eq for (A, B, C, D, E, F, G, H, I, J) where
    C: Eq,
    D: Eq,
    F: Eq,
    I: Eq,
    A: Eq,
    B: Eq,
    E: Eq,
    G: Eq,
    H: Eq,
    J: Eq + ?Sized, 

impl<Idx> Eq for RangeTo<Idx> where
    Idx: Eq, 

impl Eq for usize

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, 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> Eq for unsafe fn(A, B, C) -> Ret

impl<Idx> Eq for Range<Idx> where
    Idx: Eq, 

impl<T> Eq for [T] where
    T: Eq, 

impl<Idx> Eq for RangeToInclusive<Idx> where
    Idx: 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
    C: Eq,
    D: Eq,
    F: Eq,
    I: Eq,
    A: Eq,
    B: Eq,
    E: Eq,
    G: Eq,
    H: Eq,
    J: Eq,
    K: Eq + ?Sized, 

impl Eq for char

impl<Ret, A> Eq for extern "C" fn(A, ...) -> Ret

impl Eq for Layout

impl<Ret> Eq for unsafe extern "C" fn() -> Ret

impl<Ret, A, B, C, D, E, F> Eq for unsafe fn(A, B, C, D, E, F) -> Ret

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 Eq for i8

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, 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, G, H, I> Eq for fn(A, B, C, D, E, F, G, H, I) -> Ret

impl<Ret, A, B, C, D, E> Eq for fn(A, B, C, D, E) -> 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, 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, E> Eq for Result<T, E> where
    T: Eq,
    E: Eq, 

impl Eq for Infallible

impl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D, ...) -> Ret

impl<Ret, A, B, C, D> Eq for fn(A, B, C, D) -> Ret

impl<T> Eq for OnceCell<T> where
    T: Eq, 

impl<T> Eq for *const T where
    T: ?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) -> Ret

impl Eq for i32

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, E, F, G> Eq for fn(A, B, C, D, E, F, G) -> Ret

impl Eq for AllocError

impl<Ret, A, B, C, D, E, F> Eq for fn(A, B, C, D, E, F) -> Ret

impl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D) -> Ret

impl Eq for u8

impl<Ret, A, B, C, D, E, F> Eq for unsafe extern "C" fn(A, B, C, D, E, F, ...) -> Ret

impl Eq for SearchStep

impl<A, B, C> Eq for (A, B, C) where
    C: Eq + ?Sized,
    A: Eq,
    B: Eq, 

impl Eq for NoneError

impl<Y, R> Eq for GeneratorState<Y, R> where
    R: Eq,
    Y: Eq, 

impl<A, B, C, D, E> Eq for (A, B, C, D, E) where
    C: Eq,
    D: Eq,
    A: Eq,
    B: Eq,
    E: Eq + ?Sized, 

impl<Ret, A, B> Eq for extern "C" fn(A, B, ...) -> Ret

impl<Ret, A, B> Eq for unsafe extern "C" fn(A, B, ...) -> Ret

impl Eq for isize

impl Eq for bool

impl<'_, A> Eq for &'_ mut A where
    A: Eq + ?Sized, 

impl<Ret, A, B> Eq for unsafe extern "C" fn(A, B) -> Ret

impl<T> Eq for Cell<T> where
    T: Eq + Copy, 

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<Ret, A> Eq for unsafe extern "C" fn(A, ...) -> Ret

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 Eq for ParseBoolError

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 fn(A, B) -> Ret

impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D, ...) -> Ret

impl<Ret> Eq for extern "C" fn() -> Ret

impl<Ret, A, B, C, D, E, F, G> Eq for extern "C" fn(A, B, C, D, E, F, G, ...) -> Ret

impl Eq for u64

impl Eq for !

impl<Ret, A, B> Eq for extern "C" fn(A, B) -> 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, G, H, I, J> Eq for unsafe fn(A, B, C, D, E, F, G, H, I, J) -> Ret

impl<'_, A> Eq for &'_ A where
    A: Eq + ?Sized, 

impl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(A, B, C, D, E) -> Ret

impl Eq for RangeFull

impl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(A, B, C, D, E, ...) -> Ret

impl<A, B, C, D, E, F, G> Eq for (A, B, C, D, E, F, G) where
    C: Eq,
    D: Eq,
    F: Eq,
    A: Eq,
    B: Eq,
    E: Eq,
    G: Eq + ?Sized, 

impl<Idx> Eq for RangeInclusive<Idx> where
    Idx: Eq, 

impl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C, ...) -> Ret

impl Eq for i64

impl<T> Eq for NonNull<T> where
    T: ?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, ...) -> 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> Eq for unsafe fn(A, B, C, D, E, F, G, H) -> Ret

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 Utf8Error

impl<T> Eq for Poll<T> where
    T: Eq, 

impl Eq for ()

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
    C: Eq,
    D: Eq,
    F: Eq,
    I: Eq,
    A: Eq,
    B: Eq,
    E: Eq,
    G: Eq,
    H: Eq,
    J: Eq,
    K: Eq,
    L: Eq + ?Sized, 

impl<T> Eq for Arc<T> where
    T: Eq + ?Sized, 

impl<'_, B> Eq for Cow<'_, B> where
    B: Eq + ToOwned + ?Sized, 

impl<T> Eq for Rc<T> where
    T: Eq + ?Sized, 

impl<T> Eq for Compact<T> where
    T: Eq, 

impl Eq for Error

impl Eq for OptionBool

impl<A> Eq for ArrayVec<A> where
    A: Array,
    <A as Array>::Item: Eq, 

impl<A> Eq for ArrayString<A> where
    A: Array<Item = u8> + Copy, 

impl<T> Eq for CapacityError<T> where
    T: Eq, 

impl Eq for Error

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Implementors

impl Eq for PathError

impl Eq for TypeDefPrimitive

impl Eq for MetaForm

impl Eq for scale_info::prelude::cmp::Ordering

impl Eq for TryReserveError

impl Eq for FpCategory

impl Eq for IntErrorKind

impl Eq for TypeId

impl Eq for scale_info::prelude::fmt::Error

impl Eq for PhantomPinned

impl Eq for NonZeroI8

impl Eq for NonZeroI16

impl Eq for NonZeroI32

impl Eq for NonZeroI64

impl Eq for NonZeroI128

impl Eq for NonZeroIsize

impl Eq for NonZeroU8

impl Eq for NonZeroU16

impl Eq for NonZeroU32

impl Eq for NonZeroU64

impl Eq for NonZeroU128

impl Eq for NonZeroUsize

impl Eq for ParseFloatError

impl Eq for ParseIntError

impl Eq for TryFromIntError

impl Eq for FromUtf8Error

impl Eq for String

impl Eq for MetaType

impl Eq for Registry

impl<'a, T: Eq> Eq for Symbol<'a, T>

impl<A> Eq for VecDeque<A> where
    A: Eq, 

impl<H> Eq for BuildHasherDefault<H>

impl<K, V> Eq for BTreeMap<K, V> where
    V: Eq,
    K: Eq, 

impl<K, V, S> Eq for HashMap<K, V, S> where
    S: BuildHasher,
    V: Eq,
    K: Eq + Hash, 

impl<S: Eq> Eq for PortableForm<S>

impl<S: Eq> Eq for PortableRegistry<S> where
    S: FormString, 

impl<T> Eq for Bound<T> where
    T: Eq, 

impl<T> Eq for Reverse<T> where
    T: Eq, 

impl<T> Eq for BTreeSet<T> where
    T: Eq, 

impl<T> Eq for LinkedList<T> where
    T: Eq, 

impl<T> Eq for PhantomData<T> where
    T: ?Sized, 

impl<T> Eq for Discriminant<T>

impl<T> Eq for ManuallyDrop<T> where
    T: Eq + ?Sized, 

impl<T> Eq for Wrapping<T> where
    T: Eq, 

impl<T, A> Eq for Box<T, A> where
    T: Eq + ?Sized,
    A: Allocator, 

impl<T, A> Eq for Vec<T, A> where
    T: Eq,
    A: Allocator, 

impl<T, S> Eq for HashSet<T, S> where
    T: Eq + Hash,
    S: BuildHasher, 

impl<T: Eq + Form> Eq for TypeDef<T>

impl<T: Eq + Form> Eq for Field<T> where
    T::String: Eq,
    T::Type: Eq,
    T::String: Eq, 

impl<T: Eq + Form> Eq for scale_info::Path<T> where
    T::String: Eq, 

impl<T: Eq + Form> Eq for Type<T> where
    T::Type: Eq, 

impl<T: Eq + Form> Eq for TypeDefArray<T> where
    T::Type: Eq, 

impl<T: Eq + Form> Eq for TypeDefComposite<T>

impl<T: Eq + Form> Eq for TypeDefPhantom<T> where
    T::Type: Eq, 

impl<T: Eq + Form> Eq for TypeDefSequence<T> where
    T::Type: Eq, 

impl<T: Eq + Form> Eq for TypeDefTuple<T> where
    T::Type: Eq, 

impl<T: Eq + Form> Eq for TypeDefVariant<T>

impl<T: Eq + Form> Eq for Variant<T> where
    T::String: Eq, 

impl<T: Eq> Eq for Interner<T>

impl<T: Eq> Eq for UntrackedSymbol<T>

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