std::cmp::Eq - Rust
Description: API documentation for the Rust `Eq` trait in crate `std`.
Keywords: rust, rustlang, rust-lang, Eq

# 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 `derive`d, 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

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`impl Eq for IntErrorKind`

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

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## Implementors

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`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`

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`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,`

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`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,`

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`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,`

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`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,`

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`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,`

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`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,`

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`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,`

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`impl<H> Eq for BuildHasherDefault<H>`

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

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`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`

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

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`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`

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

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

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

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`impl<Ret, A, B, C, D, E, F> Eq for 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`

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`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 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`

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`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`

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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`

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`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`

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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`

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`impl<Ret, A, B, C, D, E, F, G, H> Eq for 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 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`

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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`

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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`

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`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`

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`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 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`

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`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`

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`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`

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`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`

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`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`

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`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`

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`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`

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`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<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,`

[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]

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