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):

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 {}Run

Implementations on Foreign Types

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

Implementors

impl Eq for Ordering
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impl Eq for CollectionAllocErr
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impl Eq for VarError
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impl Eq for ErrorKind
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impl Eq for SeekFrom
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impl Eq for IpAddr
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impl Eq for Ipv6MulticastScope
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impl Eq for Shutdown
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impl Eq for SocketAddr
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impl Eq for FpCategory
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impl Eq for SearchStep
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impl Eq for ParseError
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impl Eq for RecvTimeoutError
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impl Eq for TryRecvError
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impl Eq for bool
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impl Eq for char
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impl Eq for i128
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impl Eq for i16
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impl Eq for i32
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impl Eq for i64
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impl Eq for i8
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impl Eq for isize
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impl Eq for !
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impl Eq for str
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impl Eq for u128
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impl Eq for u16
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impl Eq for u32
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impl Eq for u64
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impl Eq for u8
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impl Eq for ()
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impl Eq for usize
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impl Eq for AllocErr
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impl Eq for CannotReallocInPlace
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impl Eq for Layout
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impl Eq for LayoutErr
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impl Eq for TypeId
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impl Eq for CharTryFromError
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impl Eq for DecodeUtf16Error
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impl Eq for ParseCharError
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impl Eq for UnicodeVersion
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impl Eq for CStr
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impl Eq for CString
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impl Eq for FromBytesWithNulError
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impl Eq for IntoStringError
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impl Eq for NulError
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impl Eq for OsStr
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impl Eq for OsString
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impl Eq for Error
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impl Eq for FileType
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impl Eq for Permissions
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impl Eq for Pinned
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impl Eq for AddrParseError
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impl Eq for Ipv4Addr
[src]

impl Eq for Ipv6Addr
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impl Eq for SocketAddrV4
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impl Eq for SocketAddrV6
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impl Eq for NonZeroU128
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impl Eq for NonZeroU16
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impl Eq for NonZeroU32
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impl Eq for NonZeroU64
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impl Eq for NonZeroU8
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impl Eq for NonZeroUsize
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impl Eq for ParseFloatError
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impl Eq for ParseIntError
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impl Eq for TryFromIntError
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impl Eq for RangeFull
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impl Eq for NoneError
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impl Eq for Path
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impl Eq for PathBuf
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impl Eq for StripPrefixError
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impl Eq for ExitStatus
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impl Eq for Output
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impl Eq for ParseBoolError
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impl Eq for Utf8Error
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impl Eq for String
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impl Eq for RecvError
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impl Eq for WaitTimeoutResult
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impl Eq for ThreadId
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impl Eq for Duration
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impl Eq for Instant
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impl Eq for SystemTime
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impl<'_, A> Eq for &'_ A where
    A: Eq + ?Sized
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impl<'_, A> Eq for &'_ mut A where
    A: Eq + ?Sized
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impl<'a> Eq for Component<'a>
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impl<'a> Eq for Prefix<'a>
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impl<'a> Eq for Components<'a>
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impl<'a> Eq for PrefixComponent<'a>
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impl<'a, B> Eq for Cow<'a, B> where
    B: Eq + ToOwned + ?Sized
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impl<A> Eq for (A,) where
    A: Eq + ?Sized
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impl<A> Eq for VecDeque<A> where
    A: Eq
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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
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impl<A, B, C, D> Eq for (A, B, C, D) where
    A: Eq,
    B: Eq,
    C: Eq,
    D: Eq + ?Sized
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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
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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
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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>
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impl<Idx> Eq for Range<Idx> where
    Idx: Eq
[src]

impl<Idx> Eq for RangeFrom<Idx> where
    Idx: Eq
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impl<Idx> Eq for RangeInclusive<Idx> where
    Idx: Eq
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impl<Idx> Eq for RangeTo<Idx> where
    Idx: Eq
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impl<Idx> Eq for RangeToInclusive<Idx> where
    Idx: Eq
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impl<K, V> Eq for BTreeMap<K, V> where
    K: Eq,
    V: Eq
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impl<K, V, S> Eq for HashMap<K, V, S> where
    K: Eq + Hash,
    V: Eq,
    S: BuildHasher
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impl<P> Eq for Pin<P> where
    P: Eq
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impl<Ret> Eq for fn() -> Ret
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impl<Ret> Eq for extern "C" fn() -> Ret
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impl<Ret> Eq for unsafe fn() -> Ret
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impl<Ret> Eq for unsafe extern "C" fn() -> Ret
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impl<Ret, A> Eq for fn(A) -> Ret
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impl<Ret, A> Eq for extern "C" fn(A) -> Ret
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impl<Ret, A> Eq for extern "C" fn(A, ...) -> Ret
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impl<Ret, A> Eq for unsafe fn(A) -> Ret
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impl<Ret, A> Eq for unsafe extern "C" fn(A) -> Ret
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impl<Ret, A> Eq for unsafe extern "C" fn(A, ...) -> Ret
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impl<Ret, A, B> Eq for fn(A, B) -> Ret
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impl<Ret, A, B> Eq for extern "C" fn(A, B) -> Ret
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impl<Ret, A, B> Eq for extern "C" fn(A, B, ...) -> Ret
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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, ...) -> Ret
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impl<Ret, A, B, C> Eq for fn(A, B, C) -> Ret
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impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C) -> Ret
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impl<Ret, A, B, C> Eq for extern "C" fn(A, B, C, ...) -> Ret
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impl<Ret, A, B, C> Eq for unsafe fn(A, B, C) -> Ret
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impl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C) -> Ret
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impl<Ret, A, B, C> Eq for unsafe extern "C" fn(A, B, C, ...) -> Ret
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impl<Ret, A, B, C, D> Eq for fn(A, B, C, D) -> Ret
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impl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D) -> Ret
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impl<Ret, A, B, C, D> Eq for extern "C" fn(A, B, C, D, ...) -> Ret
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impl<Ret, A, B, C, D> Eq for unsafe fn(A, B, C, D) -> Ret
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impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D) -> Ret
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impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(A, B, C, D, ...) -> Ret
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impl<Ret, A, B, C, D, E> Eq for fn(A, B, C, D, E) -> Ret
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impl<Ret, A, B, C, D, E> Eq for extern "C" fn(A, B, C, D, E) -> Ret
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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 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, ...) -> 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
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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 unsafe fn(A, B, C, D, E, F) -> Ret
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impl<Ret, A, B, C, D, E, F> Eq for unsafe extern "C" fn(A, B, C, D, E, F) -> Ret
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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, G> Eq for fn(A, B, C, D, E, F, G) -> Ret
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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, ...) -> Ret
[src]

impl<Ret, A, B, C, D, E, F, G> Eq for unsafe fn(A, B, C, D, E, F, G) -> Ret
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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, ...) -> 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
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impl<Ret, A, B, C, D, E, F, G, H> Eq for extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Ret
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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
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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, I> Eq for fn(A, B, C, D, E, F, G, H, I) -> Ret
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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, ...) -> Ret
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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, ...) -> 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, ...) -> 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, ...) -> Ret
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impl<T> Eq for Bound<T> where
    T: Eq
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impl<T> Eq for Option<T> where
    T: Eq
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impl<T> Eq for Poll<T> where
    T: Eq
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impl<T> Eq for [T; 0] where
    T: Eq
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impl<T> Eq for [T; 1] where
    T: Eq
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impl<T> Eq for [T; 2] where
    T: Eq
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impl<T> Eq for [T; 3] where
    T: Eq
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impl<T> Eq for [T; 4] where
    T: Eq
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impl<T> Eq for [T; 5] where
    T: Eq
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impl<T> Eq for [T; 6] where
    T: Eq
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impl<T> Eq for [T; 7] where
    T: Eq
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impl<T> Eq for [T; 8] where
    T: Eq
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impl<T> Eq for [T; 9] where
    T: Eq
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impl<T> Eq for [T; 10] where
    T: Eq
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impl<T> Eq for [T; 11] where
    T: Eq
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impl<T> Eq for [T; 12] where
    T: Eq
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impl<T> Eq for [T; 13] where
    T: Eq
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impl<T> Eq for [T; 14] where
    T: Eq
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impl<T> Eq for [T; 15] where
    T: Eq
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impl<T> Eq for [T; 16] where
    T: Eq
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impl<T> Eq for [T; 17] where
    T: Eq
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impl<T> Eq for [T; 18] where
    T: Eq
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impl<T> Eq for [T; 19] where
    T: Eq
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impl<T> Eq for [T; 20] where
    T: Eq
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impl<T> Eq for [T; 21] where
    T: Eq
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impl<T> Eq for [T; 22] where
    T: Eq
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impl<T> Eq for [T; 23] where
    T: Eq
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impl<T> Eq for [T; 24] where
    T: Eq
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impl<T> Eq for [T; 25] where
    T: Eq
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impl<T> Eq for [T; 26] where
    T: Eq
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impl<T> Eq for [T; 27] where
    T: Eq
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impl<T> Eq for [T; 28] where
    T: Eq
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impl<T> Eq for [T; 29] where
    T: Eq
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impl<T> Eq for [T; 30] where
    T: Eq
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impl<T> Eq for [T; 31] where
    T: Eq
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impl<T> Eq for [T; 32] where
    T: Eq
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impl<T> Eq for *const T where
    T: ?Sized
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impl<T> Eq for *mut T where
    T: ?Sized
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impl<T> Eq for [T] where
    T: Eq
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impl<T> Eq for Box<T> where
    T: Eq + ?Sized
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impl<T> Eq for Cell<T> where
    T: Copy + Eq
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impl<T> Eq for RefCell<T> where
    T: Eq + ?Sized
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impl<T> Eq for Reverse<T> where
    T: Eq
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impl<T> Eq for BTreeSet<T> where
    T: Eq
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impl<T> Eq for LinkedList<T> where
    T: Eq
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impl<T> Eq for PhantomData<T> where
    T: ?Sized
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impl<T> Eq for Discriminant<T>
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impl<T> Eq for ManuallyDrop<T> where
    T: Eq + ?Sized
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impl<T> Eq for Wrapping<T> where
    T: Eq
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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
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impl<T, E> Eq for Result<T, E> where
    E: Eq,
    T: Eq
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impl<T, S> Eq for 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
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