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 {}

Implementors

impl Eq for byte_slice_cast::Error

impl Eq for PathError

impl Eq for TypeDefPrimitive

impl Eq for MetaForm

impl Eq for PortableForm

impl Eq for TryReserveErrorKind

impl Eq for scale_info::prelude::fmt::Alignment

impl Eq for FpCategory

impl Eq for IntErrorKind

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

impl Eq for AsciiChar

impl Eq for Infallible

impl Eq for Which

impl Eq for IpAddr

impl Eq for Ipv6MulticastScope

impl Eq for SocketAddr

impl Eq for SearchStep

impl Eq for core::sync::atomic::Ordering

impl Eq for BacktraceStatus

impl Eq for VarError

impl Eq for SeekFrom

impl Eq for ErrorKind

impl Eq for Shutdown

impl Eq for BacktraceStyle

impl Eq for RecvTimeoutError

impl Eq for TryRecvError

impl Eq for bool

impl Eq for char

impl Eq for i8

impl Eq for i16

impl Eq for i32

impl Eq for i64

impl Eq for i128

impl Eq for isize

impl Eq for !

impl Eq for str

impl Eq for u8

impl Eq for u16

impl Eq for u32

impl Eq for u64

impl Eq for u128

impl Eq for ()

impl Eq for usize

impl Eq for Lsb0

impl Eq for Msb0

impl Eq for Bytes

impl Eq for BytesMut

impl Eq for OptionBool

impl Eq for parity_scale_codec::error::Error

impl Eq for Const

impl Eq for Mut

impl Eq for NullPtrError

impl Eq for MetaType

impl Eq for PortableRegistry

impl Eq for Registry

impl Eq for TypeId

impl Eq for TryReserveError

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

impl Eq for PhantomPinned

impl Eq for Assume

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 RangeFull

impl Eq for FromUtf8Error

impl Eq for String

impl Eq for CString

impl Eq for FromVecWithNulError

impl Eq for IntoStringError

impl Eq for NulError

impl Eq for Layout

impl Eq for LayoutError

impl Eq for AllocError

impl Eq for CharTryFromError

impl Eq for ParseCharError

impl Eq for DecodeUtf16Error

impl Eq for TryFromCharError

impl Eq for CStr

impl Eq for FromBytesUntilNulError

impl Eq for FromBytesWithNulError

impl Eq for Ipv4Addr

impl Eq for Ipv6Addr

impl Eq for AddrParseError

impl Eq for SocketAddrV4

impl Eq for SocketAddrV6

impl Eq for core::ptr::alignment::Alignment

impl Eq for ParseBoolError

impl Eq for Utf8Error

impl Eq for Duration

impl Eq for TryFromFloatSecsError

impl Eq for OsStr

impl Eq for OsString

impl Eq for FileType

impl Eq for Permissions

impl Eq for UCred

impl Eq for Components<'_>

impl Eq for std::path::Path

impl Eq for PathBuf

impl Eq for StripPrefixError

impl Eq for ExitStatus

impl Eq for ExitStatusError

impl Eq for Output

impl Eq for WaitTimeoutResult

impl Eq for RecvError

impl Eq for AccessError

impl Eq for ThreadId

impl Eq for Instant

impl Eq for SystemTime

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

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

impl<'a> Eq for Location<'a>

impl<'a> Eq for Utf8Chunk<'a>

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

impl<'a, T> Eq for CompactRef<'a, T>where T: Eq,

impl<'a, T, O> Eq for IterOnes<'a, T, O>where T: Eq + 'a + BitStore, O: Eq + BitOrder,

impl<'a, T, O> Eq for IterZeros<'a, T, O>where T: Eq + 'a + BitStore, O: Eq + BitOrder,

impl<'a, T: Eq> Eq for Symbol<'a, T>

impl<A> Eq for &Awhere A: Eq + ?Sized,

impl<A> Eq for &mut Awhere A: Eq + ?Sized,

impl<A, O> Eq for BitArray<A, O>where A: BitViewSized, O: BitOrder,

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

impl<B, C> Eq for ControlFlow<B, C>where B: Eq, C: Eq,

impl<Dyn> Eq for DynMetadata<Dyn>where Dyn: ?Sized,

impl<F> Eq for Fwhere F: FnPtr,

impl<H> Eq for BuildHasherDefault<H>

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

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

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

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

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

impl<Inner> Eq for Frozen<Inner>where Inner: Eq + Mutability,

impl<K, V, A> Eq for BTreeMap<K, V, A>where K: Eq, V: Eq, A: Allocator + Clone,

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

impl<M, T> Eq for Address<M, T>where M: Mutability,

impl<M, T, O> Eq for BitRef<'_, M, T, O>where M: Mutability, T: BitStore, O: BitOrder,

impl<M, T, O> Eq for BitPtrRange<M, T, O>where M: Mutability, T: BitStore, O: BitOrder,

impl<M, T, O> Eq for BitPtr<M, T, O>where M: Mutability, T: BitStore, O: BitOrder,

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

impl<R> Eq for BitEnd<R>where R: Eq + BitRegister,

impl<R> Eq for BitIdx<R>where R: Eq + BitRegister,

impl<R> Eq for BitIdxError<R>where R: Eq + BitRegister,

impl<R> Eq for BitMask<R>where R: Eq + BitRegister,

impl<R> Eq for BitPos<R>where R: Eq + BitRegister,

impl<R> Eq for BitSel<R>where R: Eq + BitRegister,

impl<T> Eq for BitPtrError<T>where T: Eq + BitStore,

impl<T> Eq for BitSpanError<T>where T: Eq + BitStore,

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

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

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

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

impl<T> Eq for *const Twhere T: ?Sized,

impl<T> Eq for *mut Twhere T: ?Sized,

impl<T> Eq for [T]where T: Eq,

impl<T> Eq for (T₁, T₂, …, Tₙ)where T: Eq + ?Sized,

This trait is implemented for tuples up to twelve items long.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

impl<T, A> Eq for BTreeSet<T, A>where T: Eq, A: Allocator + Clone,

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

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

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

impl<T, E> Eq for Result<T, E>where T: Eq, E: Eq,

impl<T, O> Eq for BitBox<T, O>where T: BitStore, O: BitOrder,

impl<T, O> Eq for BitSlice<T, O>where T: BitStore, O: BitOrder,

Original

impl<T, O> Eq for BitVec<T, O>where T: BitStore, O: BitOrder,

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

impl<T, const CAP: usize> Eq for ArrayVec<T, CAP>where T: Eq,

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

impl<T, const N: usize> Eq for Simd<T, N>where LaneCount<N>: SupportedLaneCount, T: SimdElement + Eq,

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

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

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

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

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

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

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 TypeParameter<T>where T::String: Eq, T::Type: Eq,

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>

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

impl<const CAP: usize> Eq for ArrayString<CAP>