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 == 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: &Book) -> bool { self.isbn == other.isbn } } impl Eq for Book {}Run
Implementors
impl Eq for ParseFloatError
impl<T: Eq> Eq for Wrapping<T>
impl Eq for FpCategory
impl Eq for ParseIntError
impl<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 T
impl<T: ?Sized> Eq for *mut T
impl<Ret> Eq for fn() -> Ret
impl<Ret> Eq for extern "C" fn() -> Ret
impl<Ret> Eq for unsafe fn() -> Ret
impl<Ret> Eq for unsafe extern "C" fn() -> Ret
impl<Ret, A> Eq for fn(_: A) -> Ret
impl<Ret, A> Eq for extern "C" fn(_: A) -> Ret
impl<Ret, A> Eq for extern "C" fn(_: A, ...) -> Ret
impl<Ret, A> Eq for unsafe fn(_: A) -> Ret
impl<Ret, A> Eq for unsafe extern "C" fn(_: A) -> Ret
impl<Ret, A> Eq for unsafe extern "C" fn(_: A, ...) -> Ret
impl<Ret, A, B> Eq for fn(_: A, _: B) -> Ret
impl<Ret, A, B> Eq for extern "C" fn(_: A, _: B) -> Ret
impl<Ret, A, B> Eq for extern "C" fn(_: A, _: B, ...) -> Ret
impl<Ret, A, B> Eq for unsafe fn(_: A, _: B) -> Ret
impl<Ret, A, B> Eq for unsafe extern "C" fn(_: A, _: B) -> Ret
impl<Ret, A, B> Eq for unsafe extern "C" fn(_: A, _: B, ...) -> Ret
impl<Ret, A, B, C> Eq for fn(_: A, _: B, _: C) -> Ret
impl<Ret, A, B, C> Eq for extern "C" fn(_: A, _: B, _: C) -> Ret
impl<Ret, A, B, C> Eq for extern "C" fn(_: A, _: B, _: C, ...) -> Ret
impl<Ret, A, B, C> Eq for unsafe fn(_: A, _: B, _: C) -> Ret
impl<Ret, A, B, C> Eq for unsafe extern "C" fn(_: A, _: B, _: C) -> Ret
impl<Ret, A, B, C> Eq for unsafe extern "C" fn(_: A, _: B, _: C, ...) -> Ret
impl<Ret, A, B, C, D> Eq for fn(_: A, _: B, _: C, _: D) -> Ret
impl<Ret, A, B, C, D> Eq for extern "C" fn(_: A, _: B, _: C, _: D) -> Ret
impl<Ret, A, B, C, D> Eq for extern "C" fn(_: A, _: B, _: C, _: D, ...) -> Ret
impl<Ret, A, B, C, D> Eq for unsafe fn(_: A, _: B, _: C, _: D) -> Ret
impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D) -> Ret
impl<Ret, A, B, C, D> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, ...) -> Ret
impl<Ret, A, B, C, D, E> Eq for fn(_: A, _: B, _: C, _: D, _: E) -> Ret
impl<Ret, A, B, C, D, E> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E) -> Ret
impl<Ret, A, B, C, D, E> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, ...) -> Ret
impl<Ret, A, B, C, D, E> Eq for unsafe fn(_: A, _: B, _: C, _: D, _: E) -> Ret
impl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E) -> Ret
impl<Ret, A, B, C, D, E> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E, ...) -> Ret
impl<Ret, A, B, C, D, E, F> Eq for fn(_: A, _: B, _: C, _: D, _: E, _: F) -> Ret
impl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F) -> Ret
impl<Ret, A, B, C, D, E, F> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, ...) -> Ret
impl<Ret, A, B, C, D, E, F> Eq for unsafe fn(_: A, _: B, _: C, _: D, _: E, _: F) -> Ret
impl<Ret, A, B, C, D, E, F> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F) -> Ret
impl<Ret, A, B, C, D, E, F> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, ...) -> Ret
impl<Ret, A, B, C, D, E, F, G> Eq for fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G) -> Ret
impl<Ret, A, B, C, D, E, F, G> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G) -> Ret
impl<Ret, A, B, C, D, E, F, G> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, ...) -> Ret
impl<Ret, A, B, C, D, E, F, G> Eq for unsafe fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G) -> Ret
impl<Ret, A, B, C, D, E, F, G> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G) -> Ret
impl<Ret, A, B, C, D, E, F, G> Eq for unsafe extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, ...) -> Ret
impl<Ret, A, B, C, D, E, F, G, H> Eq for fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H) -> Ret
impl<Ret, A, B, C, D, E, F, G, H> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H) -> Ret
impl<Ret, A, B, C, D, E, F, G, H> Eq for extern "C" fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H, ...) -> Ret
impl<Ret, A, B, C, D, E, F, G, H> Eq for unsafe fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H) -> Ret
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
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
impl<Ret, A, B, C, D, E, F, G, H, I> Eq for fn(_: A, _: B, _: C, _: D, _: E, _: F, _: G, _: H, _: I) -> Ret
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
impl<T: ?Sized> Eq for NonNull<T>
impl<T: ?Sized> Eq for PhantomData<T>
impl<Y: Eq, R: Eq> Eq for GeneratorState<Y, R>
impl Eq for RangeFull
impl<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 bool
impl Eq for char
impl Eq for usize
impl Eq for u8
impl Eq for u16
impl Eq for u32
impl Eq for u64
impl Eq for u128
impl Eq for isize
impl Eq for i8
impl Eq for i16
impl Eq for i32
impl Eq for i64
impl Eq for i128
impl 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 Ordering
impl Eq for Infallible
impl Eq for TypeId
impl<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 ParseCharError
impl Eq for CharTryFromError
impl Eq for InvalidSequence
impl<T: Eq> Eq for Option<T>
impl Eq for NoneError
impl<T: Eq, E: Eq> Eq for Result<T, E>
impl<T: Eq> Eq for [T]
impl Eq for SearchStep
impl Eq for str
impl Eq for ParseBoolError
impl Eq for Utf8Error
impl Eq for Error
impl Eq for Duration
impl<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,