pub enum SubstructureFields<'a> {
Struct(&'a VariantData, Vec<FieldInfo>),
AllFieldlessEnum(&'a EnumDef),
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 where Self
is a struct.
AllFieldlessEnum(&'a EnumDef)
A non-static method handling the entire enum at once (after it has been determined that none of the enum variants has any fields).
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§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn 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: 64 bytes
Size for each variant:
Struct
: 32 bytesAllFieldlessEnum
: 8 bytesEnumMatching
: 48 bytesEnumTag
: 64 bytesStaticStruct
: 40 bytesStaticEnum
: 32 bytes