Struct VariantIdx

pub struct VariantIdx(usize);

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

For example, in the following types,

enum Demo1 {
   Variant0 { a: bool, b: i32 },
   Variant1 { c: u8, d: u64 },
}
struct Demo2 { e: u8, f: u16, g: u8 }

a is in the variant with the VariantIdx of 0, c is in the variant with the VariantIdx of 1, and g is in the variant with the VariantIdx of 0.

Tuple Fields

0: usize

Trait Implementations

impl Clone for VariantIdx

fn clone(&self) -> VariantIdx

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for VariantIdx

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

Formats the value using the given formatter.

impl Hash for VariantIdx

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl IndexedVal for VariantIdx

fn to_val(index: usize) -> VariantIdx

fn to_index(&self) -> usize

impl PartialEq for VariantIdx

fn eq(&self, other: &VariantIdx) -> 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 RustcInternal for VariantIdx

type T<'tcx> = VariantIdx

fn internal<'tcx>( &self, _tables: &mut Tables<'_>, _tcx: TyCtxt<'tcx>, ) -> VariantIdx

impl Serialize for VariantIdx

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for VariantIdx

impl Eq for VariantIdx

impl StructuralPartialEq for VariantIdx

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: 8 bytes