Struct rustc::ty::AdtDef

pub struct AdtDef {
    pub did: DefId,
    pub variants: Vec<VariantDef>,
    pub repr: ReprOptions,
    // some fields omitted
}

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The definition of an abstract data type - a struct or enum.

These are all interned (by intern_adt_def) into the adt_defs table.

Fields

did: DefId

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variants: Vec<VariantDef>

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repr: ReprOptions

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Methods

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

pub fn is_struct(&self) -> bool

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pub fn is_union(&self) -> bool

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pub fn is_enum(&self) -> bool

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pub fn is_non_exhaustive(&self) -> bool

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pub fn adt_kind(&self) -> AdtKind

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Returns the kind of the ADT - Struct or Enum.

pub fn descr(&self) -> &'static str

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pub fn variant_descr(&self) -> &'static str

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pub fn is_fundamental(&self) -> bool

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Returns whether this type is #[fundamental] for the purposes of coherence checking.

pub fn is_phantom_data(&self) -> bool

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Returns true if this is PhantomData.

pub fn is_box(&self) -> bool

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Returns true if this is Box.

pub fn has_dtor(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> bool

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Returns whether this type has a destructor.

pub fn struct_variant(&self) -> &VariantDef

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Asserts this is a struct and returns the struct's unique variant.

pub fn predicates(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> GenericPredicates<'gcx>

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pub fn all_fields<'s>(&'s self) -> impl Iterator<Item = &'s FieldDef>

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Returns an iterator over all fields contained by this ADT.

pub fn is_payloadfree(&self) -> bool

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pub fn variant_with_id(&self, vid: DefId) -> &VariantDef

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pub fn variant_index_with_id(&self, vid: DefId) -> usize

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pub fn variant_of_def(&self, def: Def) -> &VariantDef

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pub fn discriminants(
    &'a self,
    tcx: TyCtxt<'a, 'gcx, 'tcx>
) -> impl Iterator<Item = ConstInt> + 'a

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pub fn discriminant_for_variant(
    &self,
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    variant_index: usize
) -> ConstInt

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Compute the discriminant value used by a specific variant. Unlike discriminants, this is (amortized) constant-time, only doing at most one query for evaluating an explicit discriminant (the last one before the requested variant), assuming there are no constant-evaluation errors there.

pub fn destructor(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Destructor>

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Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

pub fn sized_constraint(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> &'tcx [Ty<'tcx>]

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Returns a list of types such that Self: Sized if and only if that type is Sized, or TyErr if this type is recursive.

Oddly enough, checking that the sized-constraint is Sized is actually more expressive than checking all members: the Sized trait is inductive, so an associated type that references Self would prevent its containing ADT from being Sized.

Due to normalization being eager, this applies even if the associated type is behind a pointer, e.g. issue #31299.

Trait Implementations

impl PartialEq for AdtDef

fn eq(&self, other: &Self) -> bool

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

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

This method tests for !=.

impl Eq for AdtDef

impl Hash for AdtDef

fn hash<H: Hasher>(&self, s: &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> UseSpecializedEncodable for &'tcx AdtDef

fn default_encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error>

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Defaults to returning an error (see SpecializationError).

impl<'tcx> UseSpecializedDecodable for &'tcx AdtDef

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<'gcx> HashStable<StableHashingContext<'gcx>> for AdtDef

fn hash_stable<W: StableHasherResult>(
    &self,
    hcx: &mut StableHashingContext<'gcx>,
    hasher: &mut StableHasher<W>
)

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impl Debug for AdtDef

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

Formats the value using the given formatter.