Enum rustc_abi::Variants

source ·
pub enum Variants<FieldIdx: Idx, VariantIdx: Idx> {
    Single {
        index: VariantIdx,
    },
    Multiple {
        tag: Scalar,
        tag_encoding: TagEncoding<VariantIdx>,
        tag_field: usize,
        variants: IndexVec<VariantIdx, LayoutS<FieldIdx, VariantIdx>>,
    },
}

Variants§

§

Single

Fields

§index: VariantIdx

Single enum variants, structs/tuples, unions, and all non-ADTs.

§

Multiple

Fields

§tag_encoding: TagEncoding<VariantIdx>
§tag_field: usize
§variants: IndexVec<VariantIdx, LayoutS<FieldIdx, VariantIdx>>

Enum-likes with more than one inhabited variant: each variant comes with a discriminant (usually the same as the variant index but the user can assign explicit discriminant values). That discriminant is encoded as a tag on the machine. The layout of each variant is a struct, and they all have space reserved for the tag. For enums, the tag is the sole field of the layout.

Trait Implementations§

source§

impl<FieldIdx: Clone + Idx, VariantIdx: Clone + Idx> Clone for Variants<FieldIdx, VariantIdx>

source§

fn clone(&self) -> Variants<FieldIdx, VariantIdx>

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
source§

impl<FieldIdx: Debug + Idx, VariantIdx: Debug + Idx> Debug for Variants<FieldIdx, VariantIdx>

source§

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
source§

impl<FieldIdx: Hash + Idx, VariantIdx: Hash + Idx> Hash for Variants<FieldIdx, VariantIdx>

source§

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
1.3.0 · source§

fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
source§

impl<FieldIdx, VariantIdx, __CTX> HashStable<__CTX> for Variants<FieldIdx, VariantIdx>
where __CTX: HashStableContext, VariantIdx: HashStable<__CTX> + Idx, FieldIdx: HashStable<__CTX> + Idx,

source§

fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

source§

impl<FieldIdx: PartialEq + Idx, VariantIdx: PartialEq + Idx> PartialEq for Variants<FieldIdx, VariantIdx>

source§

fn eq(&self, other: &Variants<FieldIdx, VariantIdx>) -> bool

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
source§

impl<FieldIdx: Eq + Idx, VariantIdx: Eq + Idx> Eq for Variants<FieldIdx, VariantIdx>

source§

impl<FieldIdx: Idx, VariantIdx: Idx> StructuralPartialEq for Variants<FieldIdx, VariantIdx>

Auto Trait Implementations§

§

impl<FieldIdx, VariantIdx> Freeze for Variants<FieldIdx, VariantIdx>
where VariantIdx: Freeze,

§

impl<FieldIdx, VariantIdx> RefUnwindSafe for Variants<FieldIdx, VariantIdx>
where VariantIdx: RefUnwindSafe,

§

impl<FieldIdx, VariantIdx> Send for Variants<FieldIdx, VariantIdx>
where VariantIdx: Send,

§

impl<FieldIdx, VariantIdx> Sync for Variants<FieldIdx, VariantIdx>
where VariantIdx: Sync,

§

impl<FieldIdx, VariantIdx> Unpin for Variants<FieldIdx, VariantIdx>
where VariantIdx: Unpin,

§

impl<FieldIdx, VariantIdx> UnwindSafe for Variants<FieldIdx, VariantIdx>
where VariantIdx: UnwindSafe,

Blanket Implementations§

source§

impl<T> Aligned for T

source§

const ALIGN: Alignment = _

Alignment of Self.
source§

impl<T> Any for T
where T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

source§

fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
§

impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

§

fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
§

impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

§

fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T> Instrument for T

source§

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
source§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
source§

impl<T, U> Into<U> for T
where U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T> ToOwned for T
where T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
§

impl<V, T> VZip<V> for T
where V: MultiLane<T>,

§

fn vzip(self) -> V

source§

impl<T> WithSubscriber for T

source§

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

impl<'a, T> Captures<'a> for T
where T: ?Sized,

Layout§

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.