Struct rustc_middle::ty::ProjectionTy

pub struct ProjectionTy<'tcx> {
    pub substs: SubstsRef<'tcx>,
    pub item_def_id: DefId,
}

Represents the projection of an associated type. In explicit UFCS form this would be written <T as Trait<..>>::N.

Fields

substs: SubstsRef<'tcx>

The parameters of the associated item.

item_def_id: DefId

The DefId of the TraitItem for the associated type N.

Note that this is not the DefId of the TraitRef containing this associated type, which is in tcx.associated_item(item_def_id).container, aka. tcx.parent(item_def_id).unwrap().

Implementations

impl<'tcx> ProjectionTy<'tcx>

pub fn trait_def_id(&self, tcx: TyCtxt<'tcx>) -> DefId

pub fn trait_ref_and_own_substs(
    &self,
    tcx: TyCtxt<'tcx>
) -> (TraitRef<'tcx>, &'tcx [GenericArg<'tcx>])

Extracts the underlying trait reference and own substs from this projection. For example, if this is a projection of <T as StreamingIterator>::Item<'a>, then this function would return a T: Iterator trait reference and ['a] as the own substs

pub fn trait_ref(&self, tcx: TyCtxt<'tcx>) -> TraitRef<'tcx>

Extracts the underlying trait reference from this projection. For example, if this is a projection of <T as Iterator>::Item, then this function would return a T: Iterator trait reference.

WARNING: This will drop the substs for generic associated types consider calling Self::trait_ref_and_own_substs to get those as well.

pub fn self_ty(&self) -> Ty<'tcx>

Trait Implementations

impl<'tcx> Clone for ProjectionTy<'tcx>

fn clone(&self) -> ProjectionTy<'tcx>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> Debug for ProjectionTy<'tcx>

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

Formats the value using the given formatter.

impl<'tcx, __D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<__D> for ProjectionTy<'tcx>

fn decode(__decoder: &mut __D) -> Self

impl<'tcx> Display for ProjectionTy<'tcx>

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

Formats the value using the given formatter.

impl<'tcx, __E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<__E> for ProjectionTy<'tcx>

fn encode(&self, __encoder: &mut __E)

impl<'tcx> Hash for ProjectionTy<'tcx>

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

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for ProjectionTy<'tcx>

fn hash_stable(
    &self,
    __hcx: &mut StableHashingContext<'__ctx>,
    __hasher: &mut StableHasher
)

impl<'tcx, '__lifted> Lift<'__lifted> for ProjectionTy<'tcx>

type Lifted = ProjectionTy<'__lifted>

fn lift_to_tcx(self, __tcx: TyCtxt<'__lifted>) -> Option<ProjectionTy<'__lifted>>

impl<'tcx> Ord for ProjectionTy<'tcx>

fn cmp(&self, other: &ProjectionTy<'tcx>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere
    Self: PartialOrd<Self>,

Restrict a value to a certain interval.

impl<'tcx> PartialEq<ProjectionTy<'tcx>> for ProjectionTy<'tcx>

fn eq(&self, other: &ProjectionTy<'tcx>) -> bool

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

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.

impl<'tcx> PartialOrd<ProjectionTy<'tcx>> for ProjectionTy<'tcx>

fn partial_cmp(&self, other: &ProjectionTy<'tcx>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

This method tests less than (for self and other) and is used by the < operator.

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

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

This method tests greater than (for self and other) and is used by the > operator.

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'tcx, P: PrettyPrinter<'tcx>> Print<'tcx, P> for ProjectionTy<'tcx>

type Output = P

type Error = Error

fn print(&self, cx: P) -> Result<Self::Output, Self::Error>

impl<'tcx> Relate<'tcx> for ProjectionTy<'tcx>

fn relate<R: TypeRelation<'tcx>>(
    relation: &mut R,
    a: ProjectionTy<'tcx>,
    b: ProjectionTy<'tcx>
) -> RelateResult<'tcx, ProjectionTy<'tcx>>

impl<'tcx> TypeFoldable<'tcx> for ProjectionTy<'tcx>

fn try_fold_with<__F: FallibleTypeFolder<'tcx>>(
    self,
    __folder: &mut __F
) -> Result<Self, __F::Error>

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f).

fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.

impl<'tcx> TypeVisitable<'tcx> for ProjectionTy<'tcx>

fn visit_with<__V: TypeVisitor<'tcx>>(
    &self,
    __visitor: &mut __V
) -> ControlFlow<__V::BreakTy>

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v).

fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool

Returns 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.

fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool

Returns true if this self has any regions that escape binder (and hence are not bound by it).

fn has_escaping_bound_vars(&self) -> bool

fn has_type_flags(&self, flags: TypeFlags) -> bool

fn has_projections(&self) -> bool

fn has_opaque_types(&self) -> bool

fn references_error(&self) -> bool

fn error_reported(&self) -> Option<ErrorGuaranteed>

fn has_param_types_or_consts(&self) -> bool

fn has_infer_regions(&self) -> bool

fn has_infer_types(&self) -> bool

fn has_infer_types_or_consts(&self) -> bool

fn needs_infer(&self) -> bool

fn has_placeholders(&self) -> bool

fn needs_subst(&self) -> bool

fn has_free_regions(&self) -> bool

“Free” regions in this context means that it has any region that is not (a) erased or (b) late-bound.

fn has_erased_regions(&self) -> bool

fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.

fn is_global(&self) -> bool

Indicates whether this value references only ‘global’ generic parameters that are the same regardless of what fn we are in. This is used for caching.

fn has_late_bound_regions(&self) -> bool

True if there are any late-bound regions

fn still_further_specializable(&self) -> bool

Indicates whether this value still has parameters/placeholders/inference variables which could be replaced later, in a way that would change the results of impl specialization.

impl<'tcx> Copy for ProjectionTy<'tcx>

impl<'tcx> Eq for ProjectionTy<'tcx>

impl<'tcx> StructuralEq for ProjectionTy<'tcx>

impl<'tcx> StructuralPartialEq for ProjectionTy<'tcx>

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes