Type Definition rustc::ty::subst::Substs

type Substs<'tcx> = Slice<Kind<'tcx>>;

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A substitution mapping type/region parameters to new values.

Methods

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

pub fn identity_for_item(
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    def_id: DefId
) -> &'tcx Substs<'tcx>

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Creates a Substs that maps each generic parameter to itself.

pub fn for_item<FR, FT>(
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    def_id: DefId,
    mk_region: FR,
    mk_type: FT
) -> &'tcx Substs<'tcx> where
    FR: FnMut(&RegionParameterDef, &[Kind<'tcx>]) -> Region<'tcx>,
    FT: FnMut(&TypeParameterDef, &[Kind<'tcx>]) -> Ty<'tcx>, 

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Creates a Substs for generic parameter definitions, by calling closures to obtain each region and type. The closures get to observe the Substs as they're being built, which can be used to correctly substitute defaults of type parameters.

pub fn extend_to<FR, FT>(
    &self,
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    def_id: DefId,
    mk_region: FR,
    mk_type: FT
) -> &'tcx Substs<'tcx> where
    FR: FnMut(&RegionParameterDef, &[Kind<'tcx>]) -> Region<'tcx>,
    FT: FnMut(&TypeParameterDef, &[Kind<'tcx>]) -> Ty<'tcx>, 

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pub fn fill_item<FR, FT>(
    substs: &mut Vec<Kind<'tcx>>,
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    defs: &Generics,
    mk_region: &mut FR,
    mk_type: &mut FT
) where
    FR: FnMut(&RegionParameterDef, &[Kind<'tcx>]) -> Region<'tcx>,
    FT: FnMut(&TypeParameterDef, &[Kind<'tcx>]) -> Ty<'tcx>, 

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pub fn is_noop(&self) -> bool

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

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

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pub fn type_at(&self, i: usize) -> Ty<'tcx>

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pub fn region_at(&self, i: usize) -> Region<'tcx>

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pub fn type_for_def(&self, ty_param_def: &TypeParameterDef) -> Ty<'tcx>

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pub fn region_for_def(&self, def: &RegionParameterDef) -> Region<'tcx>

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pub fn rebase_onto(
    &self,
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    source_ancestor: DefId,
    target_substs: &Substs<'tcx>
) -> &'tcx Substs<'tcx>

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Transform from substitutions for a child of source_ancestor (e.g. a trait or impl) to substitutions for the same child in a different item, with target_substs as the base for the target impl/trait, with the source child-specific parameters (e.g. method parameters) on top of that base.

pub fn truncate_to(
    &self,
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    generics: &Generics
) -> &'tcx Substs<'tcx>

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Trait Implementations

impl<'gcx> TransNormalize<'gcx> for &'gcx Substs<'gcx>

fn trans_normalize<'a, 'tcx>(
    &self,
    infcx: &InferCtxt<'a, 'gcx, 'tcx>,
    param_env: ParamEnv<'tcx>
) -> Self

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impl<'tcx> Relate<'tcx> for &'tcx Substs<'tcx>

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

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impl<'tcx> TypeFoldable<'tcx> for &'tcx Substs<'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 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> UseSpecializedDecodable for &'tcx Substs<'tcx>

fn default_decode<D>(&mut D) -> Result<Self, <D as Decoder>::Error> where
    D: Decoder, 

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Defaults to returning an error (see SpecializationError).

impl<'a, 'tcx> Lift<'tcx> for &'a Substs<'a>

type Lifted = &'tcx Substs<'tcx>

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

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