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: &Book) -> bool {
        self.isbn == other.isbn
    }
}
impl Eq for Book {}

Implementations on Foreign Types

impl Eq for VarError

impl Eq for RecvError

impl Eq for WaitTimeoutResult

impl Eq for NulError

impl Eq for ExitStatus

impl Eq for IntoStringError

impl Eq for FileType

impl Eq for Ipv4Addr

impl Eq for SocketAddrV4

impl Eq for Instant

impl Eq for FromBytesWithNulError

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

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

impl Eq for Ipv6MulticastScope

impl Eq for SeekFrom

impl Eq for Shutdown

impl Eq for RecvTimeoutError

impl Eq for Permissions

impl Eq for Output

impl Eq for StripPrefixError

impl Eq for Path

impl Eq for TryRecvError

impl Eq for ErrorKind

impl Eq for OsString

impl Eq for IpAddr

impl Eq for CString

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

impl Eq for SocketAddr

impl Eq for OsStr

impl Eq for SystemTime

impl Eq for PathBuf

impl Eq for ThreadId

impl Eq for CStr

impl Eq for AddrParseError

impl Eq for Ipv6Addr

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

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

impl<'a> Eq for Components<'a>

impl Eq for SocketAddrV6

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

impl Eq for Pinned

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

impl<T> Eq for [T] where     T: Eq,

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

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

impl Eq for Duration

impl Eq for CannotReallocInPlace

impl Eq for Layout

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

impl Eq for u128

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

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

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<T> Eq for [T; 21] where     T: Eq,

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

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

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

impl<T> Eq for [T; 19] where     T: Eq,

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

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

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

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

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<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 Eq for NonZeroU128

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 [T; 9] where     T: Eq,

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

impl<T> Eq for [T; 8] 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<T> Eq for [T; 25] where     T: Eq,

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

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

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

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<T> Eq for [T; 29] where     T: 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<T> Eq for [T; 5] where     T: Eq,

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

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

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

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

impl Eq for TryFromIntError

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

impl Eq for NonZeroUsize

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

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

impl Eq for LayoutErr

impl Eq for ParseFloatError

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

impl Eq for isize

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

impl Eq for NonZeroU16

impl<Ret> Eq for fn() -> 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<T> Eq for [T; 16] where     T: Eq,

impl Eq for i64

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

impl Eq for char

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

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

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

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

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

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

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

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

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

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

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

impl Eq for FpCategory

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

impl Eq for i8

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 i32

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 IntErrorKind

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

impl Eq for NonZeroU64

impl Eq for u8

impl Eq for bool

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

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

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

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

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

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

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

impl Eq for u16

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

impl<T> Eq for [T; 18] where     T: Eq,

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

impl Eq for usize

impl Eq for NonZeroU8

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

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

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

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

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

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

impl Eq for str

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

impl Eq for CharTryFromError

impl Eq for i16

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 DecodeUtf16Error

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

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

impl<T> Eq for [T; 11] 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, 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; 24] where     T: Eq,

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

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

impl Eq for UnicodeVersion

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

impl<T> Eq for [T; 4] where     T: 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     A: Eq,     B: Eq,     C: Eq,     D: Eq,     E: Eq,     F: Eq,     G: Eq,     H: Eq,     I: Eq,     J: Eq,     K: Eq + ?Sized,

impl Eq for AllocErr

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 !

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<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<T> Eq for *mut T where     T: ?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 Eq for u32

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

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<T> Eq for [T; 26] where     T: Eq,

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 ()

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

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

impl Eq for NonZeroU32

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

impl<T> Eq for [T; 31] 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, ...) -> Ret

impl Eq for i128

impl Eq for TypeId

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

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

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

impl Eq for ParseCharError

impl Eq for u64

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

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

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

Implementors

impl Eq for Error

impl Eq for NoneError

impl Eq for SearchStep

impl Eq for ParseBoolError

impl Eq for RangeFull

impl Eq for Ordering

impl Eq for ParseError

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 BTreeSet<T> where     T: Eq,

impl<T> Eq for LinkedList<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,