Struct rustc::ty::Instance

pub struct Instance<'tcx> {
    pub def: InstanceDef<'tcx>,
    pub substs: &'tcx Substs<'tcx>,
}

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Fields

def: InstanceDef<'tcx>

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substs: &'tcx Substs<'tcx>

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Methods

impl<'a, 'tcx> Instance<'tcx>

pub fn ty(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>) -> Ty<'tcx>

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impl<'a, 'b, 'tcx> Instance<'tcx>

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

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pub fn mono(tcx: TyCtxt<'a, 'tcx, 'b>, def_id: DefId) -> Instance<'tcx>

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pub fn def_id(&self) -> DefId

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pub fn resolve(     tcx: TyCtxt<'a, 'tcx, 'tcx>,     param_env: ParamEnv<'tcx>,     def_id: DefId,     substs: &'tcx Substs<'tcx> ) -> Option<Instance<'tcx>>

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Resolve a (def_id, substs) pair to an (optional) instance -- most commonly, this is used to find the precise code that will run for a trait method invocation, if known.

Returns None if we cannot resolve Instance to a specific instance. For example, in a context like this,

fn foo<T: Debug>(t: T) { ... }

trying to resolve Debug::fmt applied to T will yield None, because we do not know what code ought to run. (Note that this setting is also affected by the RevealMode in the parameter environment.)

Presuming that coherence and type-check have succeeded, if this method is invoked in a monomorphic context (i.e., like during trans), then it is guaranteed to return Some.

pub fn resolve_closure(     tcx: TyCtxt<'a, 'tcx, 'tcx>,     def_id: DefId,     substs: ClosureSubsts<'tcx>,     requested_kind: ClosureKind ) -> Instance<'tcx>

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Trait Implementations

impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Instance<'tcx>

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

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impl<'tcx> Key for Instance<'tcx>

fn map_crate(&self) -> CrateNum

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Given an instance of this key, what crate is it referring to? This is used to find the provider.

fn default_span(&self, tcx: TyCtxt) -> Span

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In the event that a cycle occurs, if no explicit span has been given for a query with key self, what span should we use?

impl<'tcx> Copy for Instance<'tcx>

impl<'tcx> Clone for Instance<'tcx>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> PartialEq for Instance<'tcx>

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

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

fn ne(&self, other: &Instance<'tcx>) -> bool

This method tests for !=.

impl<'tcx> Eq for Instance<'tcx>

fn assert_receiver_is_total_eq(&self)

impl<'tcx> Hash for Instance<'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> Debug for Instance<'tcx>

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

Formats the value using the given formatter.

impl<'tcx> Encodable for Instance<'tcx>

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

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impl<'tcx> Decodable for Instance<'tcx>

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

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impl<'tcx> Display for Instance<'tcx>

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

Formats the value using the given formatter.

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

type Lifted = Instance<'tcx>

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

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impl<'tcx> TypeFoldable<'tcx> for Instance<'tcx>

fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(     &self,     folder: &mut F ) -> 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 has_skol(&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_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.

fn has_erasable_regions(&self) -> bool

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True if there any any un-erased free regions.

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.