1.0.0[−][src]Trait 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 {}Run

Implementations on Foreign Types

`impl Eq for CpuidResult`[src]

`impl<'a> Eq for Utf8LossyChunk<'a>`[src]

`impl Eq for PrintFmt`[src]

`impl Eq for CollectionAllocErr`

`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,`

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Implementors

`impl Eq for std::cmp::Ordering`[src]

`impl Eq for TryReserveError`[src]

`impl Eq for Infallible`[src]

`impl Eq for VarError`[src]

`impl Eq for ErrorKind`[src]

`impl Eq for SeekFrom`[src]

`impl Eq for IpAddr`[src]

`impl Eq for Ipv6MulticastScope`[src]

`impl Eq for Shutdown`[src]

`impl Eq for SocketAddr`[src]

`impl Eq for FpCategory`[src]

`impl Eq for IntErrorKind`[src]

`impl Eq for SearchStep`[src]

`impl Eq for std::sync::atomic::Ordering`[src]

`impl Eq for RecvTimeoutError`[src]

`impl Eq for TryRecvError`[src]

`impl Eq for bool`[src]

`impl Eq for char`[src]

`impl Eq for i128`[src]

`impl Eq for i16`[src]

`impl Eq for i32`[src]

`impl Eq for i64`[src]

`impl Eq for i8`[src]

`impl Eq for isize`[src]

`impl Eq for !`[src]

`impl Eq for str`[src]

`impl Eq for u128`[src]

`impl Eq for u16`[src]

`impl Eq for u32`[src]

`impl Eq for u64`[src]

`impl Eq for u8`[src]

`impl Eq for ()`[src]

`impl Eq for usize`[src]

`impl Eq for AllocErr`[src]

`impl Eq for CannotReallocInPlace`[src]

`impl Eq for Layout`[src]

`impl Eq for LayoutErr`[src]

`impl Eq for TypeId`[src]

`impl Eq for CharTryFromError`[src]

`impl Eq for DecodeUtf16Error`[src]

`impl Eq for ParseCharError`[src]

`impl Eq for UnicodeVersion`[src]

`impl Eq for CStr`[src]

`impl Eq for CString`[src]

`impl Eq for FromBytesWithNulError`[src]

`impl Eq for IntoStringError`[src]

`impl Eq for NulError`[src]

`impl Eq for OsStr`[src]

`impl Eq for OsString`[src]

`impl Eq for Error`[src]

`impl Eq for FileType`[src]

`impl Eq for Permissions`[src]

`impl Eq for PhantomPinned`[src]

`impl Eq for AddrParseError`[src]

`impl Eq for Ipv4Addr`[src]

`impl Eq for Ipv6Addr`[src]

`impl Eq for SocketAddrV4`[src]

`impl Eq for SocketAddrV6`[src]

`impl Eq for NonZeroI128`[src]

`impl Eq for NonZeroI16`[src]

`impl Eq for NonZeroI32`[src]

`impl Eq for NonZeroI64`[src]

`impl Eq for NonZeroI8`[src]

`impl Eq for NonZeroIsize`[src]

`impl Eq for NonZeroU128`[src]

`impl Eq for NonZeroU16`[src]

`impl Eq for NonZeroU32`[src]

`impl Eq for NonZeroU64`[src]

`impl Eq for NonZeroU8`[src]

`impl Eq for NonZeroUsize`[src]

`impl Eq for ParseFloatError`[src]

`impl Eq for ParseIntError`[src]

`impl Eq for TryFromIntError`[src]

`impl Eq for RangeFull`[src]

`impl Eq for NoneError`[src]

`impl Eq for Path`[src]

`impl Eq for PathBuf`[src]

`impl Eq for StripPrefixError`[src]

`impl Eq for ExitStatus`[src]

`impl Eq for Output`[src]

`impl Eq for ParseBoolError`[src]

`impl Eq for Utf8Error`[src]

`impl Eq for String`[src]

`impl Eq for RecvError`[src]

`impl Eq for WaitTimeoutResult`[src]

`impl Eq for AccessError`[src]

`impl Eq for ThreadId`[src]

`impl Eq for Duration`[src]

`impl Eq for Instant`[src]

`impl Eq for SystemTime`[src]

`impl<'_> Eq for Components<'_>`[src]

`impl<'_, A> Eq for &'_ A where A: Eq + ?Sized,` [src]

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

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

`impl<'a> Eq for Component<'a>`[src]

`impl<'a> Eq for Prefix<'a>`[src]

`impl<'a> Eq for PrefixComponent<'a>`[src]

`impl<A> Eq for (A,) where A: Eq + ?Sized,` [src]

`impl<A> Eq for VecDeque<A> where A: Eq,` [src]

`impl<A, B> Eq for (A, B) where A: Eq, B: Eq + ?Sized,` [src]

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

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

`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,` [src]

`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,` [src]

`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,` [src]

`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,` [src]

`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,` [src]

`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,` [src]

`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,` [src]

`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,` [src]

`impl<H> Eq for BuildHasherDefault<H>`[src]

`impl<Idx> Eq for Range<Idx> where Idx: Eq,` [src]

`impl<Idx> Eq for RangeFrom<Idx> where Idx: Eq,` [src]

`impl<Idx> Eq for RangeInclusive<Idx> where Idx: Eq,` [src]

`impl<Idx> Eq for RangeTo<Idx> where Idx: Eq,` [src]

`impl<Idx> Eq for RangeToInclusive<Idx> where Idx: Eq,` [src]

`impl<K, V> Eq for BTreeMap<K, V> where K: Eq, V: Eq,` [src]

`impl<K, V, S> Eq for std::collections::HashMap<K, V, S> where K: Eq + Hash, V: Eq, S: BuildHasher,` [src]

`impl<P> Eq for Pin<P> where P: Eq,` [src]

`impl<Ret> Eq for fn() -> Ret`[src]

`impl<Ret> Eq for extern "C" fn() -> Ret`[src]

`impl<Ret> Eq for unsafe fn() -> Ret`[src]

`impl<Ret> Eq for unsafe extern "C" fn() -> Ret`[src]

`impl<Ret, A> Eq for fn(A) -> Ret`[src]

`impl<Ret, A> Eq for extern "C" fn(A) -> Ret`[src]

`impl<Ret, A> Eq for extern "C" fn(A, VaListImpl) -> Ret`[src]

`impl<Ret, A> Eq for unsafe fn(A) -> Ret`[src]

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

`impl<Ret, A> Eq for unsafe extern "C" fn(A, VaListImpl) -> Ret`[src]

`impl<Ret, A, B> Eq for fn(A, B) -> Ret`[src]

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

`impl<Ret, A, B> Eq for extern "C" fn(A, B, VaListImpl) -> Ret`[src]

`impl<Ret, A, B> Eq for unsafe fn(A, B) -> Ret`[src]

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

`impl<Ret, A, B> Eq for unsafe extern "C" fn(A, B, VaListImpl) -> Ret`[src]

`impl<Ret, A, B, C> Eq for fn(A, B, C) -> Ret`[src]

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

`impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C, VaListImpl) -> Ret`[src]

`impl<Ret, A, B, C> Eq for unsafe fn(A, B, C) -> Ret`[src]

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

`impl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C, VaListImpl) -> Ret`[src]

`impl<Ret, A, B, C, D> Eq for fn(A, B, C, D) -> Ret`[src]

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

`impl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D, VaListImpl) -> Ret`[src]

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

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

`impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D, VaListImpl) -> Ret`[src]

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

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

`impl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E, VaListImpl) -> Ret`[src]

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

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

`impl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(A, B, C, D, E, VaListImpl) -> Ret`[src]

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

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

`impl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(A, B, C, D, E, F, VaListImpl) -> Ret`[src]

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

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

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

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

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

`impl<Ret, A, B, C, D, E, F, G> Eq for extern "C" fn(A, B, C, D, E, F, G, VaListImpl) -> Ret`[src]

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

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

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

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

`impl<Ret, A, B, C, D, E, F, G, H> Eq for extern "C" fn(A, B, C, D, E, F, G, H) -> Ret`[src]

`impl<Ret, A, B, C, D, E, F, G, H> Eq for extern "C" fn(A, B, C, D, E, F, G, H, VaListImpl) -> Ret`[src]

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

`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`[src]

`impl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe extern "C" fn(A, B, C, D, E, F, G, H, VaListImpl) -> Ret`[src]

`impl<Ret, A, B, C, D, E, F, G, H, I> Eq for fn(A, B, C, D, E, F, G, H, I) -> Ret`[src]

`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`[src]

`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, VaListImpl) -> Ret`[src]

`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`[src]

`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`[src]

`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, VaListImpl) -> Ret`[src]

`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`[src]

`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`[src]

`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, VaListImpl) -> Ret`[src]

`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`[src]

`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`[src]

`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, VaListImpl) -> Ret`[src]

`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`[src]

`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`[src]

`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, VaListImpl) -> Ret`[src]

`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`[src]

`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`[src]

`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, VaListImpl) -> Ret`[src]

`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`[src]

`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`[src]

`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, VaListImpl) -> Ret`[src]

`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`[src]

`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`[src]

`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, VaListImpl) -> Ret`[src]

`impl<T> Eq for Bound<T> where T: Eq,` [src]

`impl<T> Eq for Option<T> where T: Eq,` [src]

`impl<T> Eq for Poll<T> where T: Eq,` [src]

`impl<T> Eq for *const T where T: ?Sized,` [src]

`impl<T> Eq for *mut T where T: ?Sized,` [src]

`impl<T> Eq for [T] where T: Eq,` [src]

`impl<T> Eq for Box<T> where T: Eq + ?Sized,` [src]

`impl<T> Eq for Cell<T> where T: Copy + Eq,` [src]

`impl<T> Eq for RefCell<T> where T: Eq + ?Sized,` [src]

`impl<T> Eq for Reverse<T> where T: Eq,` [src]

`impl<T> Eq for BTreeSet<T> where T: Eq,` [src]

`impl<T> Eq for LinkedList<T> where T: Eq,` [src]

`impl<T> Eq for PhantomData<T> where T: ?Sized,` [src]

`impl<T> Eq for Discriminant<T>`[src]

`impl<T> Eq for ManuallyDrop<T> where T: Eq + ?Sized,` [src]

`impl<T> Eq for Wrapping<T> where T: Eq,` [src]

`impl<T> Eq for NonNull<T> where T: ?Sized,` [src]

`impl<T> Eq for Rc<T> where T: Eq + ?Sized,` [src]

`impl<T> Eq for Arc<T> where T: Eq + ?Sized,` [src]

`impl<T> Eq for Vec<T> where T: Eq,` [src]

`impl<T, E> Eq for Result<T, E> where E: Eq, T: Eq,` [src]

`impl<T, S> Eq for std::collections::HashSet<T, S> where T: Eq + Hash, S: BuildHasher,` [src]

`impl<T: Eq> Eq for TrySendError<T>`[src]

`impl<T: Eq> Eq for SendError<T>`[src]

`impl<Y, R> Eq for GeneratorState<Y, R> where R: Eq, Y: Eq,` [src]

`impl<const N: usize, T> Eq for [T; N] where T: Eq, [T; N]: LengthAtMost32,` [src]

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1.0.0[−][src]Trait std::cmp::Eq

Derivable

How can I implement Eq?

Implementations on Foreign Types

impl Eq for CpuidResult[src]

impl<'a> Eq for Utf8LossyChunk<'a>[src]

impl Eq for PrintFmt[src]

impl Eq for CollectionAllocErr

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,

Implementors

impl Eq for std::cmp::Ordering[src]

impl Eq for TryReserveError[src]

impl Eq for Infallible[src]

impl Eq for VarError[src]

impl Eq for ErrorKind[src]

impl Eq for SeekFrom[src]

impl Eq for IpAddr[src]

impl Eq for Ipv6MulticastScope[src]

impl Eq for Shutdown[src]

impl Eq for SocketAddr[src]

impl Eq for FpCategory[src]

impl Eq for IntErrorKind[src]

impl Eq for SearchStep[src]

impl Eq for std::sync::atomic::Ordering[src]

impl Eq for RecvTimeoutError[src]

impl Eq for TryRecvError[src]

impl Eq for bool[src]

impl Eq for char[src]

impl Eq for i128[src]

impl Eq for i16[src]

impl Eq for i32[src]

impl Eq for i64[src]

impl Eq for i8[src]

impl Eq for isize[src]

impl Eq for ![src]

impl Eq for str[src]

impl Eq for u128[src]

impl Eq for u16[src]

impl Eq for u32[src]

impl Eq for u64[src]

impl Eq for u8[src]

impl Eq for ()[src]

impl Eq for usize[src]

impl Eq for AllocErr[src]

impl Eq for CannotReallocInPlace[src]

impl Eq for Layout[src]

impl Eq for LayoutErr[src]

impl Eq for TypeId[src]

impl Eq for CharTryFromError[src]

impl Eq for DecodeUtf16Error[src]

impl Eq for ParseCharError[src]

impl Eq for UnicodeVersion[src]

impl Eq for CStr[src]

impl Eq for CString[src]

impl Eq for FromBytesWithNulError[src]

impl Eq for IntoStringError[src]

impl Eq for NulError[src]

impl Eq for OsStr[src]

impl Eq for OsString[src]

impl Eq for Error[src]

impl Eq for FileType[src]

impl Eq for Permissions[src]

impl Eq for PhantomPinned[src]

impl Eq for AddrParseError[src]

impl Eq for Ipv4Addr[src]

impl Eq for Ipv6Addr[src]

impl Eq for SocketAddrV4[src]

impl Eq for SocketAddrV6[src]

impl Eq for NonZeroI128[src]

impl Eq for NonZeroI16[src]

impl Eq for NonZeroI32[src]

impl Eq for NonZeroI64[src]

impl Eq for NonZeroI8[src]

impl Eq for NonZeroIsize[src]

impl Eq for NonZeroU128[src]

impl Eq for NonZeroU16[src]

impl Eq for NonZeroU32[src]

impl Eq for NonZeroU64[src]

impl Eq for NonZeroU8[src]