Trait nom::lib::std::prelude::v1::rust_2021::Eq1.0.0[−][src]

pub trait Eq: PartialEq<Self> { }

Expand description

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 {}

Trait nom::lib::std::prelude::v1::rust_2021::Eq1.0.0[−][src]

Derivable

How can I implement Eq?

Implementations on Foreign Types

impl Eq for CStr

impl Eq for VarError

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

impl Eq for BacktraceStatus

impl Eq for Permissions

impl Eq for SocketAddrV6

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

impl Eq for PathBuf

impl Eq for SocketAddr

impl Eq for OsString

impl Eq for OsStr

impl Eq for ErrorKind

impl Eq for Shutdown

impl Eq for ExitStatus

impl Eq for IpAddr

impl Eq for WaitTimeoutResult

impl Eq for AccessError

impl Eq for Output

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

impl Eq for SeekFrom

impl Eq for NulError

impl Eq for IntoStringError

impl Eq for Ipv4Addr

impl Eq for Ipv6MulticastScope

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

impl Eq for Instant

impl Eq for RecvError

impl Eq for Path

impl Eq for StripPrefixError

impl Eq for SystemTime

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

impl Eq for TryRecvError

impl Eq for FileType

impl Eq for ExitStatusError

impl Eq for ThreadId

impl Eq for Ipv6Addr

impl Eq for FromVecWithNulError

impl Eq for AddrParseError

impl Eq for RecvTimeoutError

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

impl Eq for UCred

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

impl Eq for FromBytesWithNulError

impl Eq for CString

impl Eq for SocketAddrV4

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

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

impl Eq for ParseCharError

impl Eq for i32

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

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

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

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

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

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

impl Eq for isize

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

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> 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 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> 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, 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 usize

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

impl Eq for i64

impl Eq for u32

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

impl Eq for IntErrorKind

impl Eq for NonZeroI8

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

How can I implement `Eq`?

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

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

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

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

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

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

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

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

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<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 NonNull<T> where
T: ?Sized,

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

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 Poll<T> where
T: Eq,

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

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

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

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

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

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

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

impl<Dyn> Eq for DynMetadata<Dyn> where
Dyn: ?Sized,