Trait nom::lib::std::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 AddrParseError

impl Eq for WaitTimeoutResult

impl Eq for PathBuf

impl Eq for RecvError

impl Eq for ExitStatus

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

impl Eq for CString

impl Eq for SocketAddrV4

impl Eq for IntoStringError

impl Eq for OsString

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

impl Eq for ErrorKind

impl Eq for RecvTimeoutError

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

impl Eq for Output

impl Eq for SocketAddrV6

impl Eq for FromVecWithNulError

impl Eq for Shutdown

impl Eq for FromBytesWithNulError

impl Eq for SeekFrom

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

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

impl Eq for Permissions

impl Eq for IpAddr

impl Eq for ThreadId

impl Eq for Ipv6MulticastScope

impl Eq for AccessError

impl Eq for VarError

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

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

impl Eq for OsStr

impl Eq for SocketAddr

impl Eq for Instant

impl Eq for NulError

impl Eq for Ipv6Addr

impl Eq for Path

impl Eq for StripPrefixError

impl Eq for SystemTime

impl Eq for TryRecvError

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

impl Eq for FileType

impl Eq for Ipv4Addr

impl Eq for BacktraceStatus

impl Eq for CStr

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

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

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

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

impl Eq for NonZeroU64

impl<Ret, A> Eq for unsafe extern "C" 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 Eq for NonZeroUsize

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

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

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 Eq for i16

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

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 ParseFloatError

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

impl Eq for ()

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

impl Eq for i32

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

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

impl Eq for DecodeUtf16Error

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

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

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

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

impl<A, B, C, D> Eq for (A, B, C, D) where
    C: Eq,
    A: Eq,
    B: Eq,
    D: 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, ...) -> 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<Ret, A, B, C, D, E> Eq for unsafe 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, G, H, I, J, K, L> Eq for unsafe fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret

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

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

impl Eq for i128

impl Eq for Duration

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

impl Eq for NonZeroI128

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

impl Eq for u128

impl Eq for NonZeroU8

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

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 u16

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

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

impl<Ret, A, B> Eq for extern "C" 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<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 Eq for NonZeroIsize

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

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

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

impl Eq for u64

impl<T> Eq for [T] where
    T: Eq, 

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

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

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

impl Eq for IntErrorKind

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

impl Eq for NonZeroI16

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

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

impl Eq for bool

impl Eq for u8

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

impl Eq for !

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

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

impl Eq for CharTryFromError

impl Eq for u32

impl Eq for i8

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 Eq for TryFromIntError

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

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

impl Eq for str

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

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

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

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

impl Eq for FpCategory

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

impl Eq for i64

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

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

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

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

impl Eq for NonZeroU32

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

impl Eq for PhantomPinned

impl Eq for NonZeroI8

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

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

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

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

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<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,
    F: Eq,
    E: Eq,
    I: Eq,
    G: Eq,
    H: Eq,
    A: Eq,
    B: Eq,
    D: Eq,
    J: Eq + ?Sized, 

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

impl Eq for usize

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

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

impl Eq for ParseCharError

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

impl Eq for NonZeroU16

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

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<'a> Eq for Location<'a>

impl Eq for Ordering

impl Eq for NonZeroI64

impl Eq for isize

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

impl Eq for TypeId

impl Eq for NonZeroU128

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

impl Eq for NonZeroI32

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

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

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

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

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

impl<O, V> Eq for BitArray<O, V> where
    O: BitOrder,
    V: BitView, 

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

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

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

impl Eq for Msb0

impl Eq for Lsb0

impl Eq for ErrorCode

impl Eq for Error

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

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

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

impl<'t> Eq for Match<'t>

impl<'t> Eq for Match<'t>

impl Eq for MatchKind

impl Eq for Match

impl Eq for MatchKind

impl Eq for RepetitionOp

impl Eq for Ast

impl Eq for ClassUnicodeOpKind

impl Eq for WordBoundary

impl Eq for GroupKind

impl Eq for Span

impl Eq for ClassSetBinaryOpKind

impl Eq for ClassSet

impl Eq for Utf8Range

impl Eq for FlagsItem

impl Eq for Error

impl Eq for ClassSetRange

impl Eq for Class

impl Eq for RepetitionKind

impl Eq for Position

impl Eq for RepetitionKind

impl Eq for Literals

impl Eq for Error

impl Eq for ErrorKind

impl Eq for ClassSetUnion

impl Eq for Literal

impl Eq for ClassBytes

impl Eq for ClassUnicode

impl Eq for WithComments

impl Eq for Literal

impl Eq for Group

impl Eq for Hir

impl Eq for Flag

impl Eq for Concat

impl Eq for ClassSetItem

impl Eq for Assertion

impl Eq for Anchor

impl Eq for Repetition

impl Eq for ErrorKind

impl Eq for SetFlags

impl Eq for Group

impl Eq for ClassUnicodeKind

impl Eq for ClassPerlKind

impl Eq for CaptureName

impl Eq for GroupKind

impl Eq for Literal

impl Eq for ClassUnicodeRange

impl Eq for ClassSetBinaryOp

impl Eq for FlagsItemKind

impl Eq for ClassBracketed

impl Eq for ClassAscii

impl Eq for LiteralKind

impl Eq for Utf8Sequence

impl Eq for ClassUnicode

impl Eq for Comment

impl Eq for Flags

impl Eq for Repetition

impl Eq for RepetitionRange

impl Eq for HirKind

impl Eq for ClassAsciiKind

impl Eq for ClassPerl

impl Eq for AssertionKind

impl Eq for RepetitionRange

impl Eq for SpecialLiteralKind

impl Eq for HexLiteralKind

impl Eq for Class

impl Eq for ClassBytesRange

impl Eq for Error

impl Eq for Alternation

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

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

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Implementors

impl Eq for Needed

impl Eq for nom::error::ErrorKind

impl Eq for nom::lib::std::cmp::Ordering

impl Eq for TryReserveError

impl Eq for Infallible

impl Eq for SearchStep

impl Eq for Endianness

impl Eq for AllocError

impl Eq for Layout

impl Eq for LayoutError

impl Eq for nom::lib::std::fmt::Error

impl Eq for RangeFull

impl Eq for NoneError

impl Eq for ParseBoolError

impl Eq for Utf8Error

impl Eq for FromUtf8Error

impl Eq for String

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

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

impl<E: Eq> Eq for Err<E>

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

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

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

impl<T> Eq for Option<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 Discriminant<T>

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

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

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

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

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