Trait nom::lib::std::prelude::v1::v1::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: &Book) -> bool {
        self.isbn == other.isbn
    }
}
impl Eq for Book {}

Implementations on Foreign Types

impl Eq for Output

impl Eq for RecvTimeoutError

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

impl Eq for FileType

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

impl Eq for Instant

impl Eq for Shutdown

impl Eq for TryRecvError

impl Eq for SystemTime

impl Eq for StripPrefixError

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

impl Eq for SocketAddr

impl Eq for Ipv6MulticastScope

impl Eq for IntoStringError

impl Eq for SeekFrom

impl Eq for NulError

impl Eq for Ipv6Addr

impl Eq for AddrParseError

impl Eq for OsString

impl Eq for ErrorKind

impl Eq for ThreadId

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

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

impl Eq for SocketAddrV4

impl Eq for VarError

impl Eq for SocketAddrV6

impl Eq for CStr

impl Eq for CString

impl Eq for Path

impl Eq for OsStr

impl Eq for IpAddr

impl Eq for RecvError

impl Eq for WaitTimeoutResult

impl Eq for ExitStatus

impl Eq for FromBytesWithNulError

impl Eq for Ipv4Addr

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

impl Eq for PathBuf

impl Eq for Permissions

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 Eq for NonZeroI128

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 !

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

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

impl<T> Eq for [T; 17] where
    T: Eq, 

impl Eq for usize

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

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

impl Eq for LayoutErr

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

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

impl Eq for u32

impl Eq for i8

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, VaList) -> Ret

impl<T> Eq for [T; 21] where
    T: Eq, 

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

impl Eq for NonZeroU32

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 NonZeroI32

impl Eq for NonZeroU128

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

impl<T> Eq for [T; 28] where
    T: Eq, 

impl<T> Eq for [T; 10] where
    T: Eq, 

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

impl Eq for i128

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

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

impl Eq for ParseIntError

impl<T> Eq for [T; 16] where
    T: Eq, 

impl Eq for CharTryFromError

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

impl<T> Eq for [T; 1] where
    T: Eq, 

impl<T> Eq for [T; 31] where
    T: Eq, 

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

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

impl<T> Eq for [T; 20] where
    T: Eq, 

impl Eq for i32

impl Eq for NonZeroU8

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

impl<P> Eq for Pin<P> where
    P: Eq, 

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

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

impl Eq for i64

impl Eq for Ordering

impl<T> Eq for [T; 12] where
    T: Eq, 

impl<T> Eq for [T; 5] where
    T: 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, VaList) -> Ret

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

impl<T> Eq for [T; 14] where
    T: Eq, 

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

impl Eq for AllocErr

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 Eq for PhantomPinned

impl<T> Eq for [T; 7] where
    T: Eq, 

impl Eq for TryFromIntError

impl<T> Eq for [T; 23] where
    T: Eq, 

impl Eq for FpCategory

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

impl Eq for NonZeroUsize

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> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, VaList) -> 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<T> Eq for [T; 19] 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<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D, VaList) -> 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 TypeId

impl<T> Eq for [T; 25] where
    T: Eq, 

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

impl Eq for CannotReallocInPlace

impl<T> Eq for [T; 26] where
    T: 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, VaList) -> Ret

impl Eq for NonZeroU64

impl<T> Eq for [T] where
    T: Eq, 

impl<T> Eq for [T; 0] where
    T: Eq, 

impl Eq for NonZeroI16

impl Eq for DecodeUtf16Error

impl Eq for Duration

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<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<T> Eq for [T; 11] where
    T: Eq, 

impl Eq for u64

impl Eq for ParseCharError

impl<T> Eq for [T; 27] where
    T: Eq, 

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 [T; 24] where
    T: Eq, 

impl<T> Eq for [T; 9] where
    T: Eq, 

impl Eq for str

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

impl<T> Eq for [T; 4] where
    T: Eq, 

impl Eq for UnicodeVersion

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

impl Eq for u128

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, VaList) -> Ret

impl<T> Eq for [T; 2] 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; 32] where
    T: Eq, 

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

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

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

impl<T> Eq for [T; 6] where
    T: Eq, 

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

impl Eq for NonZeroI8

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

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

impl Eq for bool

impl<Ret, A, B, C, D, E> Eq for unsafe fn(A, B, C, D, E) -> 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<T> Eq for [T; 18] where
    T: Eq, 

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

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

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

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<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 Eq for u8

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, VaList) -> Ret

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

impl Eq for ParseFloatError

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

impl<T> Eq for [T; 3] where
    T: Eq, 

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 Eq for CpuidResult

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

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

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

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

impl Eq for NonZeroI64

impl<Ret, A, B, C, D, E, F, G, H> Eq for extern "C" fn(A, B, C, D, E, F, G, H, VaList) -> 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
    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; 29] where
    T: Eq, 

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

impl Eq for NonZeroIsize

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

impl<T> Eq for [T; 30] where
    T: Eq, 

impl Eq for ()

impl<T> Eq for [T; 15] where
    T: Eq, 

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

impl<T> Eq for [T; 13] where
    T: Eq, 

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

impl<T> Eq for [T; 22] where
    T: Eq, 

impl Eq for NonZeroU16

impl Eq for char

impl Eq for IntErrorKind

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

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

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

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

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

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

impl<T> Eq for [T; 8] where
    T: Eq, 

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

impl Eq for Layout

impl Eq for i16

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

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

impl Eq for isize

impl Eq for u16

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

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<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 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 Match<'t>

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

impl Eq for Match

impl Eq for RepetitionKind

impl Eq for FlagsItem

impl Eq for Span

impl Eq for ClassUnicodeKind

impl Eq for HexLiteralKind

impl Eq for ClassSetBinaryOp

impl Eq for HirKind

impl Eq for LiteralKind

impl Eq for ClassAscii

impl Eq for Group

impl Eq for Error

impl Eq for ClassSetItem

impl Eq for Group

impl Eq for Alternation

impl Eq for ClassAsciiKind

impl Eq for Flags

impl Eq for Hir

impl Eq for RepetitionRange

impl Eq for Anchor

impl Eq for RepetitionKind

impl Eq for Literal

impl Eq for Error

impl Eq for CaptureName

impl Eq for Literal

impl Eq for SpecialLiteralKind

impl Eq for FlagsItemKind

impl Eq for Position

impl Eq for WordBoundary

impl Eq for GroupKind

impl Eq for Error

impl Eq for ErrorKind

impl Eq for RepetitionRange

impl Eq for Concat

impl Eq for ClassPerl

impl Eq for ClassSetBinaryOpKind

impl Eq for Repetition

impl Eq for ClassBytes

impl Eq for AssertionKind

impl Eq for Repetition

impl Eq for Class

impl Eq for Ast

impl Eq for Literals

impl Eq for WithComments

impl Eq for ClassPerlKind

impl Eq for ClassUnicode

impl Eq for ClassUnicodeRange

impl Eq for GroupKind

impl Eq for ClassBytesRange

impl Eq for Assertion

impl Eq for Class

impl Eq for ClassBracketed

impl Eq for Comment

impl Eq for SetFlags

impl Eq for ClassSetUnion

impl Eq for ClassSetRange

impl Eq for ClassUnicode

impl Eq for ErrorKind

impl Eq for RepetitionOp

impl Eq for ClassUnicodeOpKind

impl Eq for Literal

impl Eq for Flag

impl Eq for ClassSet

impl Eq for Utf8Range

impl Eq for Utf8Sequence

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Implementors

impl Eq for ParseBoolError

impl Eq for Infallible

impl Eq for SearchStep

impl Eq for RangeFull

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

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

impl Eq for NoneError

impl Eq for CollectionAllocErr

impl Eq for Needed

impl Eq for Endianness

impl Eq for String

impl Eq for Utf8Error

impl<'a> Eq for CompleteStr<'a>

impl<'a> Eq for CompleteByteSlice<'a>

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

impl<E: Eq> Eq for nom::ErrorKind<E>

impl<H> Eq for BuildHasherDefault<H>

impl<I: Eq, E: Eq> Eq for Context<I, E>

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 Discriminant<T>

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 LinkedList<T> where
    T: Eq, 

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

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

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

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

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

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

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

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