1.0.0[−][src]Trait core::cmp::Eq
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
impliesb == a
; and - transitive:
a == b
andb == c
impliesa == 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: &Self) -> bool { self.isbn == other.isbn } } impl Eq for Book {}Run
Implementors
impl Eq for !
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impl Eq for ()
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impl Eq for core::cmp::Ordering
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impl Eq for Infallible
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impl Eq for FpCategory
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impl Eq for IntErrorKind
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impl Eq for SearchStep
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impl Eq for core::sync::atomic::Ordering
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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 CpuidResult
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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 Error
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impl Eq for PhantomPinned
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impl Eq for NonZeroI128
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impl Eq for NonZeroI16
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impl Eq for NonZeroI32
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impl Eq for NonZeroI64
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impl Eq for NonZeroI8
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impl Eq for NonZeroIsize
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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 ParseBoolError
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impl Eq for Utf8Error
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impl Eq for Duration
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impl Eq for bool
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impl Eq for char
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impl Eq for i8
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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 i128
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impl Eq for isize
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impl Eq for str
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impl Eq for u8
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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 u128
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impl Eq for usize
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impl<'_, A: ?Sized> Eq for &'_ A where
A: Eq,
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A: Eq,
impl<'_, A: ?Sized> Eq for &'_ mut A where
A: Eq,
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A: Eq,
impl<'a> Eq for Utf8LossyChunk<'a>
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impl<A> Eq for (A,) where
A: Eq + ?Sized,
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A: Eq + ?Sized,
impl<A: Eq, B> Eq for (A, B) where
B: Eq + ?Sized,
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B: Eq + ?Sized,
impl<A: Eq, B: Eq, C> Eq for (A, B, C) where
C: Eq + ?Sized,
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C: Eq + ?Sized,
impl<A: Eq, B: Eq, C: Eq, D> Eq for (A, B, C, D) where
D: Eq + ?Sized,
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D: Eq + ?Sized,
impl<A: Eq, B: Eq, C: Eq, D: Eq, E> Eq for (A, B, C, D, E) where
E: Eq + ?Sized,
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E: Eq + ?Sized,
impl<A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F> Eq for (A, B, C, D, E, F) where
F: Eq + ?Sized,
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F: Eq + ?Sized,
impl<A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F: Eq, G> Eq for (A, B, C, D, E, F, G) where
G: Eq + ?Sized,
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G: Eq + ?Sized,
impl<A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F: Eq, G: Eq, H> Eq for (A, B, C, D, E, F, G, H) where
H: Eq + ?Sized,
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H: Eq + ?Sized,
impl<A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F: Eq, G: Eq, H: Eq, I> Eq for (A, B, C, D, E, F, G, H, I) where
I: Eq + ?Sized,
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I: Eq + ?Sized,
impl<A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F: Eq, G: Eq, H: Eq, I: Eq, J> Eq for (A, B, C, D, E, F, G, H, I, J) where
J: Eq + ?Sized,
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J: Eq + ?Sized,
impl<A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F: Eq, G: Eq, H: Eq, I: Eq, J: Eq, K> Eq for (A, B, C, D, E, F, G, H, I, J, K) where
K: Eq + ?Sized,
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K: Eq + ?Sized,
impl<A: Eq, B: Eq, C: Eq, D: Eq, E: Eq, F: Eq, G: Eq, H: Eq, I: Eq, J: Eq, K: Eq, L> Eq for (A, B, C, D, E, F, G, H, I, J, K, L) where
L: Eq + ?Sized,
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L: Eq + ?Sized,
impl<H> Eq for BuildHasherDefault<H>
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impl<Idx: Eq> Eq for Range<Idx>
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impl<Idx: Eq> Eq for RangeFrom<Idx>
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impl<Idx: Eq> Eq for RangeInclusive<Idx>
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impl<Idx: Eq> Eq for RangeTo<Idx>
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impl<Idx: Eq> Eq for RangeToInclusive<Idx>
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impl<P: Eq> Eq for Pin<P>
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impl<Ret> Eq for extern "C" fn() -> Ret
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impl<Ret> Eq for fn() -> Ret
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impl<Ret> Eq for unsafe extern "C" fn() -> Ret
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impl<Ret> Eq for unsafe fn() -> 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 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> Eq for unsafe fn(_: A) -> 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 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> Eq for unsafe fn(_: A, _: B) -> 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 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> Eq for unsafe fn(_: A, _: B, _: C) -> 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 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> Eq for unsafe fn(_: A, _: B, _: C, _: D) -> 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 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> Eq for unsafe fn(_: A, _: B, _: C, _: D, _: E) -> 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 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> Eq for unsafe fn(_: A, _: B, _: C, _: D, _: E, _: F) -> 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 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> 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, 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 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> 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, 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 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> 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, 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 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> 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, 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 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> 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, 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 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<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<T> Eq for Discriminant<T>
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impl<T: Eq + Copy> Eq for Cell<T>
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impl<T: Eq + ?Sized> Eq for ManuallyDrop<T>
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impl<T: Eq> Eq for Bound<T>
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impl<T: Eq> Eq for Option<T>
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impl<T: Eq> Eq for Poll<T>
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impl<T: Eq> Eq for Reverse<T>
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impl<T: Eq> Eq for Wrapping<T>
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impl<T: Eq> Eq for [T]
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impl<T: Eq, E: Eq> Eq for Result<T, E>
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impl<T: Eq, const N: usize> Eq for [T; N] where
[T; N]: LengthAtMost32,
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[T; N]: LengthAtMost32,