Trait core::cmp::Eq 1.0.0
[−]
[src]
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 == bimpliesb == a; and - transitive:
a == bandb == cimpliesa == 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
Implementors
impl Eq for ParseFloatErrorimpl<T: Eq> Eq for Wrapping<T>impl Eq for FpCategoryimpl Eq for ParseIntErrorimpl<T> Eq for Discriminant<T>impl<T: Eq> Eq for ManuallyDrop<T>impl<T: Eq + Zeroable> Eq for NonZero<T>impl<T: ?Sized> Eq for *const Timpl<T: ?Sized> Eq for *mut Timpl<Ret> Eq for fn() -> Retimpl<Ret> Eq for extern "C" fn() -> Retimpl<Ret> Eq for unsafe fn() -> Retimpl<Ret> Eq for unsafe extern "C" fn() -> Retimpl<Ret, A> Eq for fn(_: A) -> Retimpl<Ret, A> Eq for extern "C" fn(_: A) -> Retimpl<Ret, A> Eq for extern "C" fn(_: A, ...) -> Retimpl<Ret, A> Eq for unsafe fn(_: A) -> Retimpl<Ret, A> Eq for unsafe extern "C" fn(_: A) -> Retimpl<Ret, A> Eq for unsafe extern "C" fn(_: A, ...) -> Retimpl<Ret, A, B> Eq for fn(_: A, _: B) -> Retimpl<Ret, A, B> Eq for extern "C" fn(_: A, _: B) -> Retimpl<Ret, A, B> Eq for extern "C" fn(_: A, _: B, ...) -> Retimpl<Ret, A, B> Eq for unsafe fn(_: A, _: B) -> Retimpl<Ret, A, B> Eq for unsafe extern "C" fn(_: A, _: B) -> Retimpl<Ret, A, B> Eq for unsafe extern "C" fn(_: A, _: B, ...) -> Retimpl<Ret, A, B, C> Eq for fn(_: A, _: B, _: C) -> Retimpl<Ret, A, B, C> Eq for extern "C" fn(_: A, _: B, _: C) -> Retimpl<Ret, A, B, C> Eq for extern "C" fn(_: A, _: B, _: C, ...) -> Retimpl<Ret, A, B, C> Eq for unsafe fn(_: A, _: B, _: C) -> Retimpl<Ret, A, B, C> Eq for unsafe extern "C" fn(_: A, _: B, _: C) -> Retimpl<Ret, A, B, C> Eq for unsafe extern "C" fn(_: A, _: B, _: C, ...) -> Retimpl<Ret, A, B, C, D> Eq for fn(_: A, _: B, _: C, _: D) -> Retimpl<Ret, A, B, C, D> Eq for extern "C" fn(_: A, _: B, _: C, _: D) -> Retimpl<Ret, A, B, C, D> Eq for extern "C" fn(_: A, _: B, _: C, _: D, ...) -> Retimpl<Ret, A, B, C, D> Eq for unsafe fn(_: A, _: B, _: C, _: D) -> Retimpl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D) -> Retimpl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, ...) -> Retimpl<Ret, A, B, C, D, E> Eq for fn(_: A, _: B, _: C, _: D, _: E) -> Retimpl<Ret, A, B, C, D, E> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E) -> Retimpl<Ret, A, B, C, D, E> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, ...) -> Retimpl<Ret, A, B, C, D, E> Eq for unsafe fn(_: A, _: B, _: C, _: D, _: E) -> Retimpl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E) -> Retimpl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E, ...) -> Retimpl<Ret, A, B, C, D, E, F> Eq for fn(_: A, _: B, _: C, _: D, _: E, _: F) -> Retimpl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F) -> Retimpl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, ...) -> Retimpl<Ret, A, B, C, D, E, F> Eq for unsafe fn(_: A, _: B, _: C, _: D, _: E, _: F) -> Retimpl<Ret, A, B, C, D, E, F> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F) -> Retimpl<Ret, A, B, C, D, E, F> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, ...) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, ...) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for unsafe fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G) -> Retimpl<Ret, A, B, C, D, E, F, G> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, ...) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Eq for fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H, ...) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H) -> Retimpl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H, ...) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I> Eq for fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H, _: I) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H, _: I) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H, _: I, ...) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I> Eq for unsafe fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H, _: I) -> Retimpl<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) -> Retimpl<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, ...) -> Retimpl<Ret, A, B, C, D, E, F, G, H, I, J> Eq for fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H, _: I, _: J) -> Retimpl<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) -> Retimpl<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, ...) -> Retimpl<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) -> Retimpl<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) -> Retimpl<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, ...) -> Retimpl<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) -> Retimpl<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) -> Retimpl<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, ...) -> Retimpl<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) -> Retimpl<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) -> Retimpl<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, ...) -> Retimpl<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) -> Retimpl<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) -> Retimpl<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, ...) -> Retimpl<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) -> Retimpl<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) -> Retimpl<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, ...) -> Retimpl<T: ?Sized> Eq for PhantomData<T>impl<Y: Eq, R: Eq> Eq for GeneratorState<Y, R>impl Eq for RangeFullimpl<Idx: Eq> Eq for Range<Idx>impl<Idx: Eq> Eq for RangeFrom<Idx>impl<Idx: Eq> Eq for RangeTo<Idx>impl<Idx: Eq> Eq for RangeInclusive<Idx>impl<Idx: Eq> Eq for RangeToInclusive<Idx>impl Eq for ()impl Eq for boolimpl Eq for charimpl Eq for usizeimpl Eq for u8impl Eq for u16impl Eq for u32impl Eq for u64impl Eq for u128impl Eq for isizeimpl Eq for i8impl Eq for i16impl Eq for i32impl Eq for i64impl Eq for i128impl Eq for !impl<'a, A: ?Sized> Eq for &'a A where
A: Eq,impl<'a, A: ?Sized> Eq for &'a mut A where
A: Eq,impl<T: Eq> Eq for Reverse<T>impl Eq for Orderingimpl Eq for Infallibleimpl Eq for TypeIdimpl<T: Eq> Eq for [T; 0]impl<T: Eq> Eq for [T; 1]impl<T: Eq> Eq for [T; 2]impl<T: Eq> Eq for [T; 3]impl<T: Eq> Eq for [T; 4]impl<T: Eq> Eq for [T; 5]impl<T: Eq> Eq for [T; 6]impl<T: Eq> Eq for [T; 7]impl<T: Eq> Eq for [T; 8]impl<T: Eq> Eq for [T; 9]impl<T: Eq> Eq for [T; 10]impl<T: Eq> Eq for [T; 11]impl<T: Eq> Eq for [T; 12]impl<T: Eq> Eq for [T; 13]impl<T: Eq> Eq for [T; 14]impl<T: Eq> Eq for [T; 15]impl<T: Eq> Eq for [T; 16]impl<T: Eq> Eq for [T; 17]impl<T: Eq> Eq for [T; 18]impl<T: Eq> Eq for [T; 19]impl<T: Eq> Eq for [T; 20]impl<T: Eq> Eq for [T; 21]impl<T: Eq> Eq for [T; 22]impl<T: Eq> Eq for [T; 23]impl<T: Eq> Eq for [T; 24]impl<T: Eq> Eq for [T; 25]impl<T: Eq> Eq for [T; 26]impl<T: Eq> Eq for [T; 27]impl<T: Eq> Eq for [T; 28]impl<T: Eq> Eq for [T; 29]impl<T: Eq> Eq for [T; 30]impl<T: Eq> Eq for [T; 31]impl<T: Eq> Eq for [T; 32]impl<T: Eq + Copy> Eq for Cell<T>impl<T: ?Sized + Eq> Eq for RefCell<T>impl Eq for CharTryFromErrorimpl Eq for InvalidSequenceimpl<T: Eq> Eq for Option<T>impl Eq for NoneErrorimpl<T: Eq, E: Eq> Eq for Result<T, E>impl<T: Eq> Eq for [T]impl Eq for SearchStepimpl Eq for strimpl Eq for ParseBoolErrorimpl Eq for Utf8Errorimpl Eq for Errorimpl<A> Eq for (A,) where
A: Eq + ?Sized,impl<A: Eq, B> Eq for (A, B) where
B: Eq + ?Sized,impl<A: Eq, B: Eq, C> Eq for (A, B, C) where
C: Eq + ?Sized,impl<A: Eq, B: Eq, C: Eq, D> Eq for (A, B, C, D) where
D: Eq + ?Sized,impl<A: Eq, B: Eq, C: Eq, D: Eq, E> Eq for (A, B, C, D, E) where
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,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,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,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,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,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,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,