[−][src]Enum rustc_ap_rustc_target::abi::TagEncoding
Variants
The tag directly stores the discriminant, but possibly with a smaller layout (so converting the tag to the discriminant can require sign extension).
Niche (values invalid for a type) encoding the discriminant:
Discriminant and variant index coincide.
The variant dataful_variant
contains a niche at an arbitrary
offset (field tag_field
of the enum), which for a variant with
discriminant d
is set to
(d - niche_variants.start).wrapping_add(niche_start)
.
For example, Option<(usize, &T)>
is represented such that
None
has a null pointer for the second tuple field, and
Some
is the identity function (with a non-null reference).
Fields of Niche
Trait Implementations
impl Debug for TagEncoding
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impl Eq for TagEncoding
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impl Hash for TagEncoding
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pub fn hash<__H: Hasher>(&self, state: &mut __H)
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pub fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
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H: Hasher,
impl<__CTX> HashStable<__CTX> for TagEncoding where
__CTX: HashStableContext,
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__CTX: HashStableContext,
pub fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)
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impl PartialEq<TagEncoding> for TagEncoding
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pub fn eq(&self, other: &TagEncoding) -> bool
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pub fn ne(&self, other: &TagEncoding) -> bool
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impl StructuralEq for TagEncoding
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impl StructuralPartialEq for TagEncoding
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Auto Trait Implementations
impl RefUnwindSafe for TagEncoding
impl Send for TagEncoding
impl Sync for TagEncoding
impl Unpin for TagEncoding
impl UnwindSafe for TagEncoding
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<'a, T> Captures<'a> for T where
T: ?Sized,
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T: ?Sized,
impl<Q, K> Equivalent<K> for Q where
K: Borrow<Q> + ?Sized,
Q: Eq + ?Sized,
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K: Borrow<Q> + ?Sized,
Q: Eq + ?Sized,
pub fn equivalent(&self, key: &K) -> bool
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impl<T> Erased for T
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impl<T> From<T> for T
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impl<T> Instrument for T
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pub fn instrument(self, span: Span) -> Instrumented<Self>
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pub fn in_current_span(self) -> Instrumented<Self>
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> MaybeResult<T> for T
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type Error = !
pub fn from(Result<T, <T as MaybeResult<T>>::Error>) -> T
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pub fn to_result(Self) -> Result<T, <T as MaybeResult<T>>::Error>
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impl<T> Same<T> for T
type Output = T
Should always be Self
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,