pub enum SubstructureFields<'a> {
Struct(&'a VariantData, Vec<FieldInfo>),
EnumMatching(usize, usize, &'a Variant, Vec<FieldInfo>),
EnumTag(FieldInfo, Option<P<Expr>>),
StaticStruct(&'a VariantData, StaticFields),
StaticEnum(&'a EnumDef, Vec<(Ident, Span, StaticFields)>),
}
Expand description
A summary of the possible sets of fields.
Variants
Struct(&'a VariantData, Vec<FieldInfo>)
A non-static method with Self
is a struct.
EnumMatching(usize, usize, &'a Variant, Vec<FieldInfo>)
Matching variants of the enum: variant index, variant count, ast::Variant,
fields: the field name is only non-None
in the case of a struct
variant.
EnumTag(FieldInfo, Option<P<Expr>>)
The tag of an enum. The first field is a FieldInfo
for the tags, as
if they were fields. The second field is the expression to combine the
tag expression with; it will be None
if no match is necessary.
StaticStruct(&'a VariantData, StaticFields)
A static method where Self
is a struct.
StaticEnum(&'a EnumDef, Vec<(Ident, Span, StaticFields)>)
A static method where Self
is an enum.
Auto Trait Implementations
impl<'a> !RefUnwindSafe for SubstructureFields<'a>
impl<'a> !Send for SubstructureFields<'a>
impl<'a> !Sync for SubstructureFields<'a>
impl<'a> Unpin for SubstructureFields<'a>
impl<'a> !UnwindSafe for SubstructureFields<'a>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
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: 72 bytes
Size for each variant:
Struct
: 32 bytesEnumMatching
: 48 bytesEnumTag
: 64 bytesStaticStruct
: 40 bytesStaticEnum
: 32 bytes