Struct rustc_target::abi::VariantIdx

pub struct VariantIdx {
    pub(crate) private: u32,
}

The source-order index of a variant in a type.

For enums, these are always 0..variant_count, regardless of any custom discriminants that may have been defined, and including any variants that may end up uninhabited due to field types. (Some of the variants may not be present in a monomorphized ABI Variants, but those skipped variants are always counted when determining the index.)

structs, tuples, and unionss are considered to have a single variant with variant index zero, aka FIRST_VARIANT.

Fields

private: u32

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: 4 bytes