Struct rustc::ty::TraitRef

pub struct TraitRef<'tcx> {
    pub def_id: DefId,
    pub substs: &'tcx Substs<'tcx>,
}

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A complete reference to a trait. These take numerous guises in syntax, but perhaps the most recognizable form is in a where clause:

T : Foo<U>

This would be represented by a trait-reference where the def-id is the def-id for the trait Foo and the substs define T as parameter 0, and U as parameter 1.

Trait references also appear in object types like Foo<U>, but in that case the Self parameter is absent from the substitutions.

Note that a TraitRef introduces a level of region binding, to account for higher-ranked trait bounds like T : for<'a> Foo<&'a U> or higher-ranked object types.

Fields

def_id: DefId

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substs: &'tcx Substs<'tcx>

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Methods

impl<'a, 'gcx, 'tcx> TraitRef<'tcx>

pub fn from_method(
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    trait_id: DefId,
    substs: &Substs<'tcx>
) -> TraitRef<'tcx>

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impl<'tcx> TraitRef<'tcx>

pub fn new(def_id: DefId, substs: &'tcx Substs<'tcx>) -> TraitRef<'tcx>

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

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pub fn input_types<'a>(
    &'a self
) -> impl DoubleEndedIterator<Item = Ty<'tcx>> + 'a

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Trait Implementations

impl<'tcx> HashStable<StableHashingContext<'tcx>> for TraitRef<'tcx>

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

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impl<'tcx> ToTrace<'tcx> for TraitRef<'tcx>

fn to_trace(
    cause: &ObligationCause<'tcx>,
    a_is_expected: bool,
    a: Self,
    b: Self
) -> TypeTrace<'tcx>

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impl<'tcx> Relate<'tcx> for TraitRef<'tcx>

fn relate<'a, 'gcx, R>(
    relation: &mut R,
    a: &TraitRef<'tcx>,
    b: &TraitRef<'tcx>
) -> RelateResult<'tcx, TraitRef<'tcx>> where
    R: TypeRelation<'a, 'gcx, 'tcx>,
    'gcx: 'a + 'tcx,
    'tcx: 'a, 

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impl<'a, 'tcx> Lift<'tcx> for TraitRef<'a>

type Lifted = TraitRef<'tcx>

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fn lift_to_tcx<'b, 'gcx>(
    &self,
    tcx: TyCtxt<'b, 'gcx, 'tcx>
) -> Option<Self::Lifted>

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impl<'tcx> TypeFoldable<'tcx> for TraitRef<'tcx>

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

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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

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fn has_regions_escaping_depth(&self, depth: u32) -> bool

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fn has_escaping_regions(&self) -> bool

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

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fn has_projections(&self) -> bool

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fn references_error(&self) -> bool

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fn has_param_types(&self) -> bool

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fn has_self_ty(&self) -> bool

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fn has_infer_types(&self) -> bool

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fn needs_infer(&self) -> bool

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fn needs_subst(&self) -> bool

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fn has_re_skol(&self) -> bool

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fn has_closure_types(&self) -> bool

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fn has_erasable_regions(&self) -> bool

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fn is_normalized_for_trans(&self) -> bool

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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. Errs on the side of returning false.

impl<'tcx> Copy for TraitRef<'tcx>

impl<'tcx> Clone for TraitRef<'tcx>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> PartialEq for TraitRef<'tcx>

fn eq(&self, __arg_0: &TraitRef<'tcx>) -> bool

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

fn ne(&self, __arg_0: &TraitRef<'tcx>) -> bool

This method tests for !=.

impl<'tcx> Eq for TraitRef<'tcx>

impl<'tcx> Hash for TraitRef<'tcx>

fn hash<__H: Hasher>(&self, __arg_0: &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> Encodable for TraitRef<'tcx>

fn encode<__S: Encoder>(&self, __arg_0: &mut __S) -> Result<(), __S::Error>

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impl<'tcx> Decodable for TraitRef<'tcx>

fn decode<__D: Decoder>(__arg_0: &mut __D) -> Result<TraitRef<'tcx>, __D::Error>

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impl<'tcx> ToPolyTraitRef<'tcx> for TraitRef<'tcx>

fn to_poly_trait_ref(&self) -> PolyTraitRef<'tcx>

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impl<'tcx> ToPredicate<'tcx> for TraitRef<'tcx>

fn to_predicate(&self) -> Predicate<'tcx>

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impl<'tcx> Print for TraitRef<'tcx>

fn print<F: Write>(&self, f: &mut F, cx: &mut PrintContext) -> Result

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fn print_to_string(&self, cx: &mut PrintContext) -> String

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fn print_display<F: Write>(&self, f: &mut F, cx: &mut PrintContext) -> Result

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fn print_display_to_string(&self, cx: &mut PrintContext) -> String

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fn print_debug<F: Write>(&self, f: &mut F, cx: &mut PrintContext) -> Result

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fn print_debug_to_string(&self, cx: &mut PrintContext) -> String

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impl<'tcx> Display for TraitRef<'tcx>

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

Formats the value using the given formatter.

impl<'tcx> Debug for TraitRef<'tcx>

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

Formats the value using the given formatter.