Struct VariantId 

pub struct VariantId {
    base: TypeId,
    variant: usize,
}

🔬This is a nightly-only experimental API. (type_info #146922)

Variant representing type ID. Representing a variant of an enum.

Fields

base: TypeId

🔬This is a nightly-only experimental API. (type_info #146922)

variant: usize

🔬This is a nightly-only experimental API. (type_info #146922)

Implementations

impl VariantId

pub const fn name(self) -> &'static str

🔬This is a nightly-only experimental API. (type_info #146922)

Returns the name of the variant.

#![feature(type_info)]
use std::any::TypeId;

enum Enum {
    Unit,
    Tuple(bool),
    Struct { a: bool },
}
assert_eq!(
    const { TypeId::of::<Enum>().variant(1).name() },
    "Tuple",
);

pub const fn non_exhaustive(self) -> bool

🔬This is a nightly-only experimental API. (type_info #146922)

Returns whether this variant is marked with #[non_exhaustive].

Trait Implementations

impl Clone for VariantId

fn clone(&self) -> VariantId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for VariantId

impl Debug for VariantId

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

Formats the value using the given formatter.

impl Eq for VariantId

#[doc(hidden)]

fn assert_fields_are_eq(&self)

🔬This is a nightly-only experimental API. (derive_eq_internals)

#[doc(hidden)]

fn assert_receiver_is_total_eq(&self)

👎Deprecated since 1.95.0:

implementation detail of #[derive(Eq)]

impl Hash for VariantId

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 Ord for VariantId

fn cmp(&self, other: &VariantId) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to #147781)

Restrict a value to a certain range.

impl PartialEq for VariantId

fn eq(&self, other: &VariantId) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for VariantId

fn partial_cmp(&self, other: &VariantId) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

#[doc(hidden)]

fn __chaining_lt(&self, other: &Rhs) -> ControlFlow<bool>

🔬This is a nightly-only experimental API. (partial_ord_chaining_methods)

If self == other, returns ControlFlow::Continue(()). Otherwise, returns ControlFlow::Break(self < other).

#[doc(hidden)]

fn __chaining_le(&self, other: &Rhs) -> ControlFlow<bool>

🔬This is a nightly-only experimental API. (partial_ord_chaining_methods)

Same as __chaining_lt, but for <= instead of <.

#[doc(hidden)]

fn __chaining_gt(&self, other: &Rhs) -> ControlFlow<bool>

🔬This is a nightly-only experimental API. (partial_ord_chaining_methods)

Same as __chaining_lt, but for > instead of <.

#[doc(hidden)]

fn __chaining_ge(&self, other: &Rhs) -> ControlFlow<bool>

🔬This is a nightly-only experimental API. (partial_ord_chaining_methods)

Same as __chaining_lt, but for >= instead of <.

impl StructuralPartialEq for VariantId

impl TrivialClone for VariantId