[−][src]Enum rustc::traits::Vtable
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Given the successful resolution of an obligation, the Vtable
indicates where the vtable comes from. Note that while we call this
a "vtable", it does not necessarily indicate dynamic dispatch at
runtime. Vtable
instances just tell the compiler where to find
methods, but in generic code those methods are typically statically
dispatched -- only when an object is constructed is a Vtable
instance reified into an actual vtable.
For example, the vtable may be tied to a specific impl (case A), or it may be relative to some bound that is in scope (case B).
impl<T:Clone> Clone<T> for Option<T> { ... } // Impl_1 impl<T:Clone> Clone<T> for Box<T> { ... } // Impl_2 impl Clone for int { ... } // Impl_3 fn foo<T:Clone>(concrete: Option<Box<int>>, param: T, mixed: Option<T>) { // Case A: Vtable points at a specific impl. Only possible when // type is concretely known. If the impl itself has bounded // type parameters, Vtable will carry resolutions for those as well: concrete.clone(); // Vtable(Impl_1, [Vtable(Impl_2, [Vtable(Impl_3)])]) // Case B: Vtable must be provided by caller. This applies when // type is a type parameter. param.clone(); // VtableParam // Case C: A mix of cases A and B. mixed.clone(); // Vtable(Impl_1, [VtableParam]) }
The type parameter N
See explanation on VtableImplData
.
Variants
VtableImpl(VtableImplData<'tcx, N>)
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Vtable identifying a particular impl.
VtableAutoImpl(VtableAutoImplData<N>)
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Vtable for auto trait implementations
This carries the information and nested obligations with regards
to an auto implementation for a trait Trait
. The nested obligations
ensure the trait implementation holds for all the constituent types.
VtableParam(Vec<N>)
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Successful resolution to an obligation provided by the caller
for some type parameter. The Vec<N>
represents the
obligations incurred from normalizing the where-clause (if
any).
VtableObject(VtableObjectData<'tcx, N>)
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Virtual calls through an object
VtableBuiltin(VtableBuiltinData<N>)
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Successful resolution for a builtin trait.
VtableClosure(VtableClosureData<'tcx, N>)
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Vtable automatically generated for a closure. The def ID is the ID
of the closure expression. This is a VtableImpl
in spirit, but the
impl is generated by the compiler and does not appear in the source.
VtableFnPointer(VtableFnPointerData<'tcx, N>)
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Same as above, but for a fn pointer type with the given signature.
VtableGenerator(VtableGeneratorData<'tcx, N>)
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Vtable automatically generated for a generator
Methods
impl<'tcx, N> Vtable<'tcx, N>
[src]
impl<'tcx, N> Vtable<'tcx, N>
pub fn nested_obligations(self) -> Vec<N>
[src]
pub fn nested_obligations(self) -> Vec<N>
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pub fn map<M, F>(self, f: F) -> Vtable<'tcx, M> where
F: FnMut(N) -> M,
[src]
pub fn map<M, F>(self, f: F) -> Vtable<'tcx, M> where
F: FnMut(N) -> M,
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Trait Implementations
impl<'a, 'gcx, N> HashStable<StableHashingContext<'a>> for Vtable<'gcx, N> where
N: HashStable<StableHashingContext<'a>>,
[src]
impl<'a, 'gcx, N> HashStable<StableHashingContext<'a>> for Vtable<'gcx, N> where
N: HashStable<StableHashingContext<'a>>,
fn hash_stable<W: StableHasherResult>(
&self,
hcx: &mut StableHashingContext<'a>,
hasher: &mut StableHasher<W>
)
[src]
fn hash_stable<W: StableHasherResult>(
&self,
hcx: &mut StableHashingContext<'a>,
hasher: &mut StableHasher<W>
)
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impl<'tcx, N: Debug> Debug for Vtable<'tcx, N>
[src]
impl<'tcx, N: Debug> Debug for Vtable<'tcx, N>
fn fmt(&self, f: &mut Formatter) -> Result
[src]
fn fmt(&self, f: &mut Formatter) -> Result
Formats the value using the given formatter. Read more
impl<'a, 'tcx> Lift<'tcx> for Vtable<'a, ()>
[src]
impl<'a, 'tcx> Lift<'tcx> for Vtable<'a, ()>
type Lifted = Vtable<'tcx, ()>
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fn lift_to_tcx<'b, 'gcx>(
&self,
tcx: TyCtxt<'b, 'gcx, 'tcx>
) -> Option<Self::Lifted>
[src]
fn lift_to_tcx<'b, 'gcx>(
&self,
tcx: TyCtxt<'b, 'gcx, 'tcx>
) -> Option<Self::Lifted>
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impl<'tcx, N> TypeFoldable<'tcx> for Vtable<'tcx, N> where
N: TypeFoldable<'tcx>,
[src]
impl<'tcx, N> TypeFoldable<'tcx> for Vtable<'tcx, N> where
N: TypeFoldable<'tcx>,
fn super_fold_with<'gcx: 'tcx, V: TypeFolder<'gcx, 'tcx>>(
&self,
folder: &mut V
) -> Self
[src]
fn super_fold_with<'gcx: 'tcx, V: TypeFolder<'gcx, 'tcx>>(
&self,
folder: &mut V
) -> Self
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fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool
[src]
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool
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fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
&self,
folder: &mut F
) -> Self
[src]
fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
&self,
folder: &mut F
) -> Self
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fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool
[src]
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool
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fn has_regions_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
[src]
fn has_regions_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
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True if self
has any late-bound regions that are either bound by binder
or bound by some binder outside of binder
. If binder
is ty::INNERMOST
, this indicates whether there are any late-bound regions that appear free. Read more
fn has_regions_bound_above(&self, binder: DebruijnIndex) -> bool
[src]
fn has_regions_bound_above(&self, binder: DebruijnIndex) -> bool
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True if this self
has any regions that escape binder
(and hence are not bound by it). Read more
fn has_escaping_regions(&self) -> bool
[src]
fn has_escaping_regions(&self) -> bool
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fn has_type_flags(&self, flags: TypeFlags) -> bool
[src]
fn has_type_flags(&self, flags: TypeFlags) -> bool
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fn has_projections(&self) -> bool
[src]
fn has_projections(&self) -> bool
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fn references_error(&self) -> bool
[src]
fn references_error(&self) -> bool
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fn has_param_types(&self) -> bool
[src]
fn has_param_types(&self) -> bool
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fn has_self_ty(&self) -> bool
[src]
fn has_self_ty(&self) -> bool
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fn has_infer_types(&self) -> bool
[src]
fn has_infer_types(&self) -> bool
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fn needs_infer(&self) -> bool
[src]
fn needs_infer(&self) -> bool
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fn has_skol(&self) -> bool
[src]
fn has_skol(&self) -> bool
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fn needs_subst(&self) -> bool
[src]
fn needs_subst(&self) -> bool
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fn has_re_skol(&self) -> bool
[src]
fn has_re_skol(&self) -> bool
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fn has_closure_types(&self) -> bool
[src]
fn has_closure_types(&self) -> bool
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fn has_free_regions(&self) -> bool
[src]
fn has_free_regions(&self) -> bool
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"Free" regions in this context means that it has any region that is not (a) erased or (b) late-bound. Read more
fn has_erasable_regions(&self) -> bool
[src]
fn has_erasable_regions(&self) -> bool
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True if there any any un-erased free regions.
fn is_global(&self) -> bool
[src]
fn is_global(&self) -> bool
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Indicates whether this value references only 'global' types/lifetimes that are the same regardless of what fn we are in. This is used for caching. Read more
fn has_late_bound_regions(&self) -> bool
[src]
fn has_late_bound_regions(&self) -> bool
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True if there are any late-bound regions
fn visit_tys_shallow(
&self,
visit: impl FnMut(Ty<'tcx>) -> bool
) -> bool
[src]
fn visit_tys_shallow(
&self,
visit: impl FnMut(Ty<'tcx>) -> bool
) -> bool
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A visitor that does not recurse into types, works like fn walk_shallow
in Ty
.
impl<'tcx, N: Clone> Clone for Vtable<'tcx, N>
[src]
impl<'tcx, N: Clone> Clone for Vtable<'tcx, N>
fn clone(&self) -> Vtable<'tcx, N>
[src]
fn clone(&self) -> Vtable<'tcx, N>
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl<'tcx, N: PartialEq> PartialEq for Vtable<'tcx, N>
[src]
impl<'tcx, N: PartialEq> PartialEq for Vtable<'tcx, N>
fn eq(&self, other: &Vtable<'tcx, N>) -> bool
[src]
fn eq(&self, other: &Vtable<'tcx, N>) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, other: &Vtable<'tcx, N>) -> bool
[src]
fn ne(&self, other: &Vtable<'tcx, N>) -> bool
This method tests for !=
.
impl<'tcx, N: Eq> Eq for Vtable<'tcx, N>
[src]
impl<'tcx, N: Eq> Eq for Vtable<'tcx, N>
fn assert_receiver_is_total_eq(&self)
[src]
fn assert_receiver_is_total_eq(&self)
impl<'tcx, N: Encodable> Encodable for Vtable<'tcx, N>
[src]
impl<'tcx, N: Encodable> Encodable for Vtable<'tcx, N>
fn encode<__SN: Encoder>(&self, s: &mut __SN) -> Result<(), __SN::Error>
[src]
fn encode<__SN: Encoder>(&self, s: &mut __SN) -> Result<(), __SN::Error>
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impl<'tcx, N: Decodable> Decodable for Vtable<'tcx, N>
[src]
impl<'tcx, N: Decodable> Decodable for Vtable<'tcx, N>
Auto Trait Implementations
Blanket Implementations
impl<T> MaybeResult for T
[src]
impl<T> MaybeResult for T
fn from_ok(T) -> T
[src]
fn from_ok(T) -> T
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fn map_same<F>(Self, F) -> T where
F: FnOnce(T) -> T,
[src]
fn map_same<F>(Self, F) -> T where
F: FnOnce(T) -> T,
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impl<'tcx, T> Subst for T where
T: TypeFoldable<'tcx>,
[src]
impl<'tcx, T> Subst for T where
T: TypeFoldable<'tcx>,
fn subst_spanned(
&Self,
TyCtxt<'a, 'gcx, 'tcx>,
&[Kind<'tcx>],
Option<Span>
) -> T
[src]
fn subst_spanned(
&Self,
TyCtxt<'a, 'gcx, 'tcx>,
&[Kind<'tcx>],
Option<Span>
) -> T
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fn subst<'a, 'gcx>(
&self,
tcx: TyCtxt<'a, 'gcx, 'tcx>,
substs: &[Kind<'tcx>]
) -> Self
[src]
fn subst<'a, 'gcx>(
&self,
tcx: TyCtxt<'a, 'gcx, 'tcx>,
substs: &[Kind<'tcx>]
) -> Self
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impl<'a, T> Captures for T where
T: ?Sized,
[src]
impl<'a, T> Captures for T where
T: ?Sized,
impl<T> ToOwned for T where
T: Clone,
[src]
impl<T> ToOwned for T where
T: Clone,
type Owned = T
fn to_owned(&self) -> T
[src]
fn to_owned(&self) -> T
Creates owned data from borrowed data, usually by cloning. Read more
fn clone_into(&self, target: &mut T)
[src]
fn clone_into(&self, target: &mut T)
🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
impl<T> From for T
[src]
impl<T> From for T
impl<T, U> Into for T where
U: From<T>,
[src]
impl<T, U> Into for T where
U: From<T>,
impl<T, U> TryFrom for T where
T: From<U>,
[src]
impl<T, U> TryFrom for T where
T: From<U>,
type Error = !
try_from
)The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
[src]
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
try_from
)Performs the conversion.
impl<T> Borrow for T where
T: ?Sized,
[src]
impl<T> Borrow for T where
T: ?Sized,
ⓘImportant traits for &'a mut Rfn borrow(&self) -> &T
[src]
fn borrow(&self) -> &T
Immutably borrows from an owned value. Read more
impl<T, U> TryInto for T where
U: TryFrom<T>,
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impl<T, U> TryInto for T where
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
try_from
)The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
[src]
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
try_from
)Performs the conversion.
impl<T> BorrowMut for T where
T: ?Sized,
[src]
impl<T> BorrowMut for T where
T: ?Sized,
ⓘImportant traits for &'a mut Rfn borrow_mut(&mut self) -> &mut T
[src]
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<T> Any for T where
T: 'static + ?Sized,
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impl<T> Any for T where
T: 'static + ?Sized,
fn get_type_id(&self) -> TypeId
[src]
fn get_type_id(&self) -> TypeId
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static
Gets the TypeId
of self
. Read more
impl<T> Encodable for T where
T: UseSpecializedEncodable + ?Sized,
[src]
impl<T> Encodable for T where
T: UseSpecializedEncodable + ?Sized,
fn encode<E>(&self, e: &mut E) -> Result<(), <E as Encoder>::Error> where
E: Encoder,
[src]
fn encode<E>(&self, e: &mut E) -> Result<(), <E as Encoder>::Error> where
E: Encoder,
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impl<T> Decodable for T where
T: UseSpecializedDecodable,
[src]
impl<T> Decodable for T where
T: UseSpecializedDecodable,
fn decode<D>(d: &mut D) -> Result<T, <D as Decoder>::Error> where
D: Decoder,
[src]
fn decode<D>(d: &mut D) -> Result<T, <D as Decoder>::Error> where
D: Decoder,
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impl<E> SpecializationError for E
[src]
impl<E> SpecializationError for E
fn not_found<S, T>(trait_name: &'static str, method_name: &'static str) -> E where
T: ?Sized,
[src]
fn not_found<S, T>(trait_name: &'static str, method_name: &'static str) -> E where
T: ?Sized,
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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S
is the encoder/decoder state type, T
is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more
impl<T> Erased for T
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impl<T> Erased for T
impl<T> Send for T where
T: ?Sized,
[src]
impl<T> Send for T where
T: ?Sized,
impl<T> Sync for T where
T: ?Sized,
[src]
impl<T> Sync for T where
T: ?Sized,
impl<T> Erased for T
impl<T> Erased for T