Trait gstd::prelude::cmp::Eq

pub trait Eq: PartialEq { }

Trait for comparisons corresponding to equivalence relations.

This means, that in addition to a == b and a != b being strict inverses, the relation must be (for all a, b and c):

• reflexive: a == a;
• symmetric: a == b implies b == a (required by PartialEq as well); and
• transitive: a == b and b == c implies a == c (required by PartialEq as well).

This property cannot be checked by the compiler, and therefore Eq implies PartialEq, and has no extra methods.

Violating this property is a logic error. The behavior resulting from a logic error is not specified, but users of the trait must ensure that such logic errors do not result in undefined behavior. This means that unsafe code must not rely on the correctness of these methods.

Implement Eq in addition to PartialEq if it’s guaranteed that PartialEq::eq(a, a) always returns true (reflexivity), in addition to the symmetric and transitive properties already required by PartialEq.

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 {}

Object Safety

This trait is not object safe.

Implementors

impl Eq for ConversionError

impl Eq for gstd::errors::CoreError

impl Eq for gstd::errors::Error

impl Eq for ErrorReplyReason

impl Eq for ExecutionError

impl Eq for ExtError

impl Eq for MemoryError

impl Eq for MessageError

impl Eq for ReplyCode

impl Eq for ReservationError

impl Eq for SignalCode

impl Eq for SimpleExecutionError

impl Eq for SimpleProgramCreationError

impl Eq for SuccessReplyReason

impl Eq for UsageError

impl Eq for AsciiChar

impl Eq for TryReserveErrorKind

impl Eq for gstd::prelude::collections::hashbrown::TryReserveError

impl Eq for Infallible

impl Eq for gstd::prelude::fmt::Alignment

impl Eq for FpCategory

impl Eq for IntErrorKind

impl Eq for SearchStep

impl Eq for gstd::prelude::cmp::Ordering

impl Eq for IpAddr

impl Eq for Ipv6MulticastScope

impl Eq for SocketAddr

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

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 gstd::errors::CodecError

impl Eq for ErrorReplyPayload

impl Eq for SyscallError

impl Eq for gstd::msg::MessageHandle

impl Eq for ActorId

impl Eq for CodeId

impl Eq for MessageId

impl Eq for Percent

impl Eq for ReservationId

impl Eq for MetaType

impl Eq for TypeId

impl Eq for CharTryFromError

impl Eq for DecodeUtf16Error

impl Eq for ParseCharError

impl Eq for TryFromCharError

impl Eq for UnorderedKeyError

impl Eq for gstd::prelude::collections::TryReserveError

impl Eq for CStr

impl Eq for CString

impl Eq for FromBytesUntilNulError

impl Eq for FromBytesWithNulError

impl Eq for FromVecWithNulError

impl Eq for IntoStringError

impl Eq for NulError

impl Eq for gstd::prelude::fmt::Error

impl Eq for PhantomPinned

impl Eq for Assume

impl Eq for ParseFloatError

impl Eq for ParseIntError

impl Eq for TryFromIntError

impl Eq for RangeFull

impl Eq for gstd::prelude::ptr::Alignment

impl Eq for ParseBoolError

impl Eq for Utf8Error

impl Eq for FromUtf8Error

impl Eq for String

impl Eq for Duration

impl Eq for TryFromFloatSecsError

impl Eq for Layout

impl Eq for LayoutError

impl Eq for core::alloc::AllocError

impl Eq for CpuidResult

impl Eq for Ipv4Addr

impl Eq for Ipv6Addr

impl Eq for AddrParseError

impl Eq for SocketAddrV4

impl Eq for SocketAddrV6

impl Eq for ATerm

impl Eq for B0

impl Eq for B1

impl Eq for Z0

impl Eq for Equal

impl Eq for Greater

impl Eq for Less

impl Eq for UTerm

impl Eq for Aborted

impl Eq for AllocError

impl Eq for BigEndian

impl Eq for Canceled

impl Eq for Error

impl Eq for Error

impl Eq for Error

impl Eq for Error

impl Eq for Error

impl Eq for Error

impl Eq for Error

impl Eq for FromStrRadixErrKind

impl Eq for H128

impl Eq for H160

impl Eq for H256

impl Eq for H384

impl Eq for H512

impl Eq for H768

impl Eq for InvalidBufferSize

impl Eq for InvalidLength

impl Eq for LittleEndian

impl Eq for MacError

impl Eq for MessageHandle

impl Eq for MetaForm

impl Eq for NonZeroU256

impl Eq for OptionBool

impl Eq for PathError

impl Eq for PollNext

impl Eq for PortableForm

impl Eq for PortableRegistry

impl Eq for PortableType

impl Eq for Registry

impl Eq for TypeDefPrimitive

impl Eq for U128

impl Eq for U256

impl Eq for U512

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

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

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

where T: Eq,

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

where T: Eq + 'a,

impl<A> Eq for &A

where A: Eq + ?Sized,

impl<A> Eq for &mut A

where A: Eq + ?Sized,

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 F

where F: FnPtr,

impl<H> Eq for BuildHasherDefault<H>

impl<Idx> Eq for gstd::prelude::ops::Range<Idx>

where Idx: Eq,

impl<Idx> Eq for gstd::prelude::ops::RangeFrom<Idx>

where Idx: Eq,

impl<Idx> Eq for gstd::prelude::ops::RangeInclusive<Idx>

where Idx: Eq,

impl<Idx> Eq for RangeTo<Idx>

where Idx: Eq,

impl<Idx> Eq for RangeToInclusive<Idx>

where Idx: Eq,

impl<Idx> Eq for core::range::Range<Idx>

where Idx: Eq,

impl<Idx> Eq for core::range::RangeFrom<Idx>

where Idx: Eq,

impl<Idx> Eq for core::range::RangeInclusive<Idx>

where Idx: Eq,

impl<K, V, A> Eq for BTreeMap<K, V, A>

where K: Eq, V: Eq, A: Allocator + Clone,

impl<K, V, S, A> Eq for HashMap<K, V, S, A>

where K: Eq + Hash, V: Eq, S: BuildHasher, A: Allocator,

impl<Ptr> Eq for Pin<Ptr>

where Ptr: Deref, <Ptr as Deref>::Target: Eq,

impl<T> Eq for Option<T>

where T: Eq,

impl<T> Eq for Bound<T>

where T: Eq,

impl<T> Eq for Poll<T>

where T: Eq,

impl<T> Eq for *const T

where T: ?Sized,

impl<T> Eq for *mut T

where 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 Cell<T>

where T: Eq + Copy,

impl<T> Eq for gstd::prelude::cell::OnceCell<T>

where T: Eq,

impl<T> Eq for RefCell<T>

where T: Eq + ?Sized,

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 NonZero<T>

where T: ZeroablePrimitive + Eq,

impl<T> Eq for Saturating<T>

where T: Eq,

impl<T> Eq for Wrapping<T>

where T: Eq,

impl<T> Eq for NonNull<T>

where T: ?Sized,

impl<T> Eq for CapacityError<T>

where T: Eq,

impl<T> Eq for Reverse<T>

where T: Eq,

impl<T> Eq for Compact<T>

where T: Eq,

impl<T> Eq for CtOutput<T>

where T: OutputSizeUser,

impl<T> Eq for Field<T>

where T: Eq + Form, <T as Form>::String: Eq, <T as Form>::Type: Eq,

impl<T> Eq for Interner<T>

where T: Eq,

impl<T> Eq for OnceCell<T>

where T: Eq,

impl<T> Eq for Path<T>

where T: Eq + Form, <T as Form>::String: Eq,

impl<T> Eq for Type<T>

where T: Eq + Form, <T as Form>::String: Eq,

impl<T> Eq for TypeDef<T>

where T: Eq + Form,

impl<T> Eq for TypeDefArray<T>

where T: Eq + Form, <T as Form>::Type: Eq,

impl<T> Eq for TypeDefBitSequence<T>

where T: Eq + Form, <T as Form>::Type: Eq,

impl<T> Eq for TypeDefCompact<T>

where T: Eq + Form, <T as Form>::Type: Eq,

impl<T> Eq for TypeDefComposite<T>

where T: Eq + Form,

impl<T> Eq for TypeDefSequence<T>

where T: Eq + Form, <T as Form>::Type: Eq,

impl<T> Eq for TypeDefTuple<T>

where T: Eq + Form, <T as Form>::Type: Eq,

impl<T> Eq for TypeDefVariant<T>

where T: Eq + Form,

impl<T> Eq for TypeParameter<T>

where T: Eq + Form, <T as Form>::String: Eq, <T as Form>::Type: Eq,

impl<T> Eq for Unalign<T>

where T: Unaligned + Eq,

impl<T> Eq for UntrackedSymbol<T>

where T: Eq,

impl<T> Eq for Variant<T>

where T: Eq + Form, <T as Form>::String: Eq,

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 Rc<T, A>

where T: Eq + ?Sized, A: Allocator,

impl<T, A> Eq for gstd::prelude::Box<T, A>

where T: Eq + ?Sized, A: Allocator,

impl<T, A> Eq for gstd::prelude::Vec<T, A>

where T: Eq, A: Allocator,

impl<T, A> Eq for Arc<T, A>

where T: Eq + ?Sized, A: Allocator,

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, B> Eq for Ref<B, [T]>

where B: ByteSlice, T: FromBytes + Eq,

impl<T, B> Eq for Ref<B, T>

where B: ByteSlice, T: FromBytes + Eq,

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

where T: Eq, E: Eq,

impl<T, E> Eq for TryChunksError<T, E>

where T: Eq, E: Eq,

impl<T, E> Eq for TryReadyChunksError<T, E>

where T: Eq, E: Eq,

impl<T, N> Eq for GenericArray<T, N>

where T: Eq, N: ArrayLength<T>,

impl<T, S, A> Eq for HashSet<T, S, A>

where T: Eq + Hash, S: BuildHasher, A: Allocator,

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<U> Eq for NInt<U>

where U: Eq + Unsigned + NonZero,

impl<U> Eq for PInt<U>

where U: Eq + Unsigned + NonZero,

impl<U, B> Eq for UInt<U, B>

where U: Eq, B: Eq,

impl<V, A> Eq for TArr<V, A>

where V: Eq, A: Eq,

impl<Y, R> Eq for CoroutineState<Y, R>

where Y: Eq, R: Eq,

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