Enum PtrMetadata

pub enum PtrMetadata {
    None,
    Length,
    VTable(TypeDeclRef),
    InheritFrom(Ty),
}

The metadata stored in a pointer. That’s the information stored in pointers alongside their address. It’s empty for Sized types, and interesting for unsized aka dynamically-sized types.

Variants

None

Types that need no metadata, namely T: Sized types.

Length

Metadata for [T] and str, and user-defined types that directly or indirectly contain one of the two. Of type usize. Notably, length for [T] denotes the number of elements in the slice. While for str it denotes the number of bytes in the string.

VTable(TypeDeclRef)

Metadata for dyn Trait, referring to the vtable struct, also for user-defined types that directly or indirectly contain a dyn Trait. Of type &'static vtable

InheritFrom(Ty)

Unknown due to generics, but will inherit from the given type. This is consistent with <Ty as Pointee>::Metadata. Of type TyKind::Metadata(Ty).

Implementations

impl PtrMetadata

pub fn into_type(self) -> Ty

Trait Implementations

impl AstVisitable for PtrMetadata

fn drive<V: VisitAst>(&self, v: &mut V) -> ControlFlow<V::Break>

Recursively visit this type with the provided visitor. This calls the visitor’s visit_$any method if it exists, otherwise visit_inner.

fn drive_mut<V: VisitAstMut>(&mut self, v: &mut V) -> ControlFlow<V::Break>

Recursively visit this type with the provided visitor. This calls the visitor’s visit_$any method if it exists, otherwise visit_inner.

fn name(&self) -> &'static str

The name of the type, used for debug logging.

fn dyn_visit<T: AstVisitable>(&self, f: impl FnMut(&T))

Visit all occurrences of that type inside self, in pre-order traversal.

fn dyn_visit_mut<T: AstVisitable>(&mut self, f: impl FnMut(&mut T))

Visit all occurrences of that type inside self, in pre-order traversal.

impl Clone for PtrMetadata

fn clone(&self) -> PtrMetadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PtrMetadata

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for PtrMetadata

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'s, V> Drive<'s, V> for PtrMetadata

where V: Visitor + Visit<'s, TypeDeclRef> + Visit<'s, Ty>,

fn drive_inner(&'s self, visitor: &mut V) -> ControlFlow<V::Break>

Call v.visit() on the immediate contents of self.

impl<'s, V> DriveMut<'s, V> for PtrMetadata

where V: Visitor + VisitMut<'s, TypeDeclRef> + VisitMut<'s, Ty>,

fn drive_inner_mut(&'s mut self, visitor: &mut V) -> ControlFlow<V::Break>

Call v.visit() on the immediate contents of self.

impl PartialEq for PtrMetadata

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for PtrMetadata

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for PtrMetadata

impl StructuralPartialEq for PtrMetadata