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

Implementations on Foreign Types

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

Implementors

impl Eq for Ordering [src]

impl Eq for CollectionAllocErr [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 SearchStep [src]

impl Eq for ParseError [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 Pinned [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 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 ThreadId [src]

impl Eq for Duration [src]

impl Eq for Instant [src]

impl Eq for SystemTime [src]

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

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

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

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

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

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

impl<'a, B> Eq for Cow<'a, B> where
    B: Eq + ToOwned + ?Sized
[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 HashMap<K, V, S> where
    K: Eq + Hash,
    V: Eq,
    S: BuildHasher
[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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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 [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 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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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, ...) -> 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 [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 [T; 0] where
    T: Eq
[src]

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

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

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

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

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

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

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

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

impl<T> Eq for [T; 9] where
    T: Eq
[src]

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

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

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

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

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

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

impl<T> Eq for [T; 16] where
    T: Eq
[src]

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

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

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

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

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

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

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

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

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

impl<T> Eq for [T; 26] where
    T: Eq
[src]

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

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

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

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

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

impl<T> Eq for [T; 32] 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 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]

© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/cmp/trait.Eq.html