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.

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<'tcx>> Decodable<__D> for ProjectionTy<'tcx>

fn decode(__decoder: &mut __D) -> Result<Self, <__D as Decoder>::Error>

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

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

Formats the value using the given formatter.

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

fn encode(&self, __encoder: &mut __E) -> Result<(), <__E as Encoder>::Error>

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<'a, 'tcx> Lift<'tcx> for ProjectionTy<'a>

type Lifted = ProjectionTy<'tcx>

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

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

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

This method returns an Ordering between self and other.

#[must_use]

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

Compares and returns the maximum of two values.

#[must_use]

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

Compares and returns the minimum of two values.

#[must_use]

fn clamp(self, min: Self, max: Self) -> 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: &ProjectionTy<'tcx>) -> bool

This method tests for !=.

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.

#[must_use]

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

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

#[must_use]

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

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

#[must_use]

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

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

#[must_use]

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 super_fold_with<__F: TypeFolder<'tcx>>(self, __folder: &mut __F) -> Self

fn super_visit_with<__F: TypeVisitor<'tcx>>(
    &self,
    __folder: &mut __F
) -> ControlFlow<__F::BreakTy>

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

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

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 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>