Struct Generics

pub struct Generics {
    pub parent: Option<DefId>,
    pub parent_count: usize,
    pub own_params: Vec<GenericParamDef>,
    pub param_def_id_to_index: FxHashMap<DefId, u32>,
    pub has_self: bool,
    pub has_late_bound_regions: Option<Span>,
    pub host_effect_index: Option<usize>,
}

Information about the formal type/lifetime parameters associated with an item or method. Analogous to hir::Generics.

The ordering of parameters is the same as in ty::GenericArg (excluding child generics): Self (optionally), Lifetime params…, Type params…

Fields

parent: Option<DefId>

parent_count: usize

own_params: Vec<GenericParamDef>

param_def_id_to_index: FxHashMap<DefId, u32>

Reverse map to the index field of each GenericParamDef.

has_self: bool

has_late_bound_regions: Option<Span>

host_effect_index: Option<usize>

Implementations

impl<'tcx> Generics

pub fn param_def_id_to_index( &self, tcx: TyCtxt<'tcx>, def_id: DefId, ) -> Option<u32>

Looks through the generics and all parents to find the index of the given param def-id. This is in comparison to the param_def_id_to_index struct member, which only stores information about this item’s own generics.

pub fn count(&self) -> usize

pub fn own_counts(&self) -> GenericParamCount

pub fn own_defaults(&self) -> GenericParamCount

pub fn requires_monomorphization(&self, tcx: TyCtxt<'tcx>) -> bool

pub fn own_requires_monomorphization(&self) -> bool

pub fn param_at( &'tcx self, param_index: usize, tcx: TyCtxt<'tcx>, ) -> &'tcx GenericParamDef

Returns the GenericParamDef with the given index.

pub fn params_to( &'tcx self, param_index: usize, tcx: TyCtxt<'tcx>, ) -> &'tcx [GenericParamDef]

pub fn region_param( &'tcx self, param: EarlyParamRegion, tcx: TyCtxt<'tcx>, ) -> &'tcx GenericParamDef

Returns the GenericParamDef associated with this EarlyParamRegion.

pub fn type_param( &'tcx self, param: ParamTy, tcx: TyCtxt<'tcx>, ) -> &'tcx GenericParamDef

Returns the GenericParamDef associated with this ParamTy.

pub fn const_param( &'tcx self, param: ParamConst, tcx: TyCtxt<'tcx>, ) -> &'tcx GenericParamDef

Returns the GenericParamDef associated with this ParamConst.

pub fn has_impl_trait(&'tcx self) -> bool

Returns true if params has impl Trait.

pub fn own_args_no_defaults<'a>( &'tcx self, tcx: TyCtxt<'tcx>, args: &'a [GenericArg<'tcx>], ) -> &'a [GenericArg<'tcx>]

Returns the args corresponding to the generic parameters of this item, excluding Self.

This should only be used for diagnostics purposes.

pub fn own_args( &'tcx self, args: &'tcx [GenericArg<'tcx>], ) -> &'tcx [GenericArg<'tcx>]

Returns the args corresponding to the generic parameters of this item, excluding Self.

This should only be used for diagnostics purposes.

pub fn check_concrete_type_after_default( &'tcx self, tcx: TyCtxt<'tcx>, args: &'tcx [GenericArg<'tcx>], ) -> bool

Returns true if a concrete type is specified after a default type. For example, consider struct T<W = usize, X = Vec<W>>(W, X) T<usize, String> will return true T<usize> will return false

pub fn is_empty(&'tcx self) -> bool

pub fn is_own_empty(&'tcx self) -> bool

Trait Implementations

impl Clone for Generics

fn clone(&self) -> Generics

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Generics

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

Formats the value using the given formatter.

impl<__D: TyDecoder> Decodable<__D> for Generics

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

impl<__E: TyEncoder> Encodable<__E> for Generics

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

impl<'tcx> GenericsOf<TyCtxt<'tcx>> for &'tcx Generics

fn count(&self) -> usize

impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for Generics

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

impl ParameterizedOverTcx for Generics

type Value<'tcx> = Generics

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: 104 bytes