Enum rustc_builtin_macros::deriving::generic::SubstructureFields

pub enum SubstructureFields<'a> {
    Struct(&'a VariantData, Vec<FieldInfo>),
    EnumMatching(usize, usize, &'a Variant, Vec<FieldInfo>),
    EnumNonMatchingCollapsed(&'a [Ident]),
    StaticStruct(&'a VariantData, StaticFields),
    StaticEnum(&'a EnumDef, Vec<(Ident, Span, StaticFields)>),
}

A summary of the possible sets of fields.

Variants

Struct(&'a VariantData, Vec<FieldInfo>)

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.

EnumNonMatchingCollapsed(&'a [Ident])

Non-matching variants of the enum, but with all state hidden from the consequent code. The field is a list of Idents bound to the variant index values for each of the actual input Self arguments.

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.

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: 56 bytes

Size for each variant:

• Struct: 32 bytes
• EnumMatching: 48 bytes
• EnumNonMatchingCollapsed: 16 bytes
• StaticStruct: 40 bytes
• StaticEnum: 32 bytes