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 ThreadId

impl Eq for FromBytesWithNulError

impl Eq for WaitTimeoutResult

impl Eq for CStr

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

impl Eq for RecvError

impl Eq for Ipv4Addr

impl Eq for IpAddr

impl Eq for Instant

impl Eq for AddrParseError

impl Eq for TryRecvError

impl Eq for SocketAddrV4

impl Eq for SeekFrom

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

impl Eq for Ipv6Addr

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

impl Eq for Shutdown

impl Eq for SocketAddrV6

impl Eq for ErrorKind

impl Eq for Output

impl Eq for IntoStringError

impl Eq for SystemTime

impl Eq for ExitStatus

impl Eq for CString

impl Eq for OsStr

impl Eq for StripPrefixError

impl Eq for RecvTimeoutError

impl Eq for VarError

impl Eq for Permissions

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

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

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

impl Eq for NulError

impl Eq for Ipv6MulticastScope

impl Eq for SocketAddr

impl Eq for Path

impl Eq for FileType

impl Eq for PathBuf

impl Eq for OsString

impl Eq for u32

impl Eq for u32x8

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

impl Eq for i16x32

impl Eq for i16x8

impl Eq for m32x8

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 Eq for DecodeUtf16Error

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

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

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

impl Eq for i64x4

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

impl Eq for m1x32

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

impl<T> Eq for *mut T where     T: ?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<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C) -> 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<T> Eq for [T; 11] where     T: Eq,

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

impl Eq for i32x2

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

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

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

impl<T> Eq for [T] 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) -> Ret

impl<T> Eq for [T; 8] 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, 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; 22] where     T: Eq,

impl Eq for i8

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

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

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 i16x16

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

impl Eq for m16x2

impl Eq for bool

impl Eq for u8x4

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

impl Eq for m8x32

impl Eq for m16x8

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

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

impl Eq for i8x2

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

impl Eq for u32x2

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 i8x32

impl Eq for u16x32

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

impl Eq for ()

impl Eq for m64x4

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

impl Eq for CannotReallocInPlace

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

impl Eq for char

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

impl Eq for m32x4

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 m8x16

impl Eq for u16

impl Eq for i32x4

impl Eq for NonZeroUsize

impl Eq for isize

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

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

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 i64

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 NonZeroI64

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

impl Eq for usize

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 ParseFloatError

impl Eq for m32x2

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 i8x16

impl Eq for u32x16

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

impl Eq for u16x8

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, ...) -> Ret

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

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

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

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

impl Eq for NonZeroU32

impl Eq for i8x64

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

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 Eq for u32x4

impl Eq for m8x8

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

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

impl Eq for UnicodeVersion

impl Eq for NonZeroU64

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

impl Eq for u64

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; 26] where     T: Eq,

impl Eq for i64x2

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

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

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

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

impl Eq for m16x4

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

impl Eq for m1x16

impl Eq for !

impl Eq for m1x64

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

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

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

impl Eq for i32x8

impl Eq for u8

impl Eq for i16x2

impl Eq for NonZeroI16

impl Eq for u8x8

impl Eq for ParseCharError

impl Eq for Layout

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

impl Eq for NonZeroU128

impl Eq for m64x2

impl Eq for i64x8

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

impl Eq for m8x2

impl Eq for i16x4

impl<T> Eq for NonZero<T> where     T: Zeroable + Eq,

impl Eq for AllocErr

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

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

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

impl Eq for InvalidSequence

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

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

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

impl Eq for Duration

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

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

impl Eq for u8x16

impl Eq for u8x2

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

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

impl Eq for m16x16

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

impl Eq for u16x2

impl Eq for m8x4

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

impl Eq for u8x64

impl Eq for NonZeroU16

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

impl Eq for m1x8

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

impl Eq for NonZeroIsize

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

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

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

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

impl Eq for FpCategory

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

impl Eq for u8x32

impl Eq for u64x8

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

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

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

impl Eq for i8x4

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 TypeId

impl Eq for NonZeroI8

impl Eq for NonZeroI32

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

impl Eq for NonZeroU8

impl Eq for u128

impl Eq for i128

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

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

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

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

impl Eq for NonZeroI128

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

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

impl Eq for u16x4

impl Eq for u16x16

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

impl<T> Eq for [T; 9] 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<Ret, A> Eq for extern "C" fn(A, ...) -> Ret

impl Eq for i32

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

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; 10] where     T: Eq,

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

impl Eq for i32x16

impl Eq for CharTryFromError

impl Eq for i16

impl Eq for i8x8

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

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

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

impl Eq for u64x4

impl Eq for u64x2

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

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

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

Implementors

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

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

• impl Eq for Error

• impl Eq for SearchStep

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

• impl Eq for CollectionAllocErr

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

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

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

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

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

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

• impl Eq for NoneError

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

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

• impl Eq for Utf8Error

• impl Eq for ParseBoolError

• impl Eq for Ordering

• impl<T> Eq for Discriminant<T>

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

• impl Eq for RangeFull

• impl<T> Eq for ManuallyDrop<T> where     T: Eq,

• impl Eq for ParseError

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

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

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

• impl<T> Eq for LinkedList<T> where     T: Eq,

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

• impl Eq for String

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

• impl<E: Eq> Eq for nom::ErrorKind<E>

• impl Eq for Needed

• impl Eq for Endianness

• impl<'a> Eq for CompleteStr<'a>

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