[][src]Enum rustc::traits::Vtable

pub enum Vtable<'tcx, N> {
    VtableImpl(VtableImplData<'tcx, N>),
    VtableAutoImpl(VtableAutoImplData<N>),
    VtableParam(Vec<N>),
    VtableObject(VtableObjectData<'tcx, N>),
    VtableBuiltin(VtableBuiltinData<N>),
    VtableClosure(VtableClosureData<'tcx, N>),
    VtableFnPointer(VtableFnPointerData<'tcx, N>),
    VtableGenerator(VtableGeneratorData<'tcx, N>),
}
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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

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Vtable identifying a particular impl.

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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.

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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).

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Virtual calls through an object

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Successful resolution for a builtin trait.

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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.

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Same as above, but for a fn pointer type with the given signature.

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Vtable automatically generated for a generator

Methods

impl<'tcx, N> Vtable<'tcx, N>
[src]

Important traits for Vec<u8>

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Trait Implementations

impl<'a, 'gcx, N> HashStable<StableHashingContext<'a>> for Vtable<'gcx, N> where
    N: HashStable<StableHashingContext<'a>>, 
[src]

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impl<'tcx, N: Debug> Debug for Vtable<'tcx, N>
[src]

Formats the value using the given formatter. Read more

impl<'a, 'tcx> Lift<'tcx> for Vtable<'a, ()>
[src]

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impl<'tcx, N> TypeFoldable<'tcx> for Vtable<'tcx, N> where
    N: TypeFoldable<'tcx>, 
[src]

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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

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True if this self has any regions that escape binder (and hence are not bound by it). Read more

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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

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True if there any any un-erased free regions.

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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

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True if there are any late-bound regions

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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]

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

impl<'tcx, N: PartialEq> PartialEq for Vtable<'tcx, N>
[src]

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

impl<'tcx, N: Eq> Eq for Vtable<'tcx, N>
[src]

impl<'tcx, N: Encodable> Encodable for Vtable<'tcx, N>
[src]

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impl<'tcx, N: Decodable> Decodable for Vtable<'tcx, N>
[src]

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Auto Trait Implementations

impl<'tcx, N> !Send for Vtable<'tcx, N>

impl<'tcx, N> !Sync for Vtable<'tcx, N>

Blanket Implementations

impl<T> MaybeResult for T
[src]

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impl<'tcx, T> Subst for T where
    T: TypeFoldable<'tcx>, 
[src]

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

impl<T> ToOwned for T where
    T: Clone
[src]

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

🔬 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]

Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
[src]

Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
[src]

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The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

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The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
[src]

🔬 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]

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impl<T> Decodable for T where
    T: UseSpecializedDecodable
[src]

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impl<E> SpecializationError for E
[src]

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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
[src]

impl<T> Send for T where
    T: ?Sized
[src]

impl<T> Sync for T where
    T: ?Sized
[src]

impl<T> Erased for T