pub struct VariantIdx {
private_use_as_methods_instead: u32,
}
Expand description
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.)
struct
s, tuples
, and unions
s are considered to have a single variant
with variant index zero, aka FIRST_VARIANT
.
Fields§
§private_use_as_methods_instead: u32
Implementations§
Source§impl VariantIdx
impl VariantIdx
Sourcepub const MAX_AS_U32: u32 = 4_294_967_040u32
pub const MAX_AS_U32: u32 = 4_294_967_040u32
Maximum value the index can take, as a u32
.
Sourcepub const MAX: VariantIdx
pub const MAX: VariantIdx
Maximum value the index can take.
Sourcepub const ZERO: VariantIdx
pub const ZERO: VariantIdx
Zero value of the index.
Sourcepub const fn from_usize(value: usize) -> VariantIdx
pub const fn from_usize(value: usize) -> VariantIdx
Sourcepub const fn from_u32(value: u32) -> VariantIdx
pub const fn from_u32(value: u32) -> VariantIdx
Sourcepub const fn from_u16(value: u16) -> VariantIdx
pub const fn from_u16(value: u16) -> VariantIdx
Sourcepub const unsafe fn from_u32_unchecked(value: u32) -> VariantIdx
pub const unsafe fn from_u32_unchecked(value: u32) -> VariantIdx
Creates a new index from a given u32
.
§Safety
The provided value must be less than or equal to the maximum value for the newtype. Providing a value outside this range is undefined due to layout restrictions.
Prefer using from_u32
.
Trait Implementations§
Source§impl Add<usize> for VariantIdx
impl Add<usize> for VariantIdx
Source§type Output = VariantIdx
type Output = VariantIdx
+
operator.Source§impl Clone for VariantIdx
impl Clone for VariantIdx
Source§fn clone(&self) -> VariantIdx
fn clone(&self) -> VariantIdx
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for VariantIdx
impl Debug for VariantIdx
Source§impl<D> Decodable<D> for VariantIdxwhere
D: Decoder,
impl<D> Decodable<D> for VariantIdxwhere
D: Decoder,
fn decode(d: &mut D) -> VariantIdx
Source§impl From<u32> for VariantIdx
impl From<u32> for VariantIdx
Source§fn from(value: u32) -> VariantIdx
fn from(value: u32) -> VariantIdx
Source§impl From<usize> for VariantIdx
impl From<usize> for VariantIdx
Source§fn from(value: usize) -> VariantIdx
fn from(value: usize) -> VariantIdx
Source§impl Hash for VariantIdx
impl Hash for VariantIdx
Source§impl<__CTX> HashStable<__CTX> for VariantIdxwhere
__CTX: HashStableContext,
impl<__CTX> HashStable<__CTX> for VariantIdxwhere
__CTX: HashStableContext,
fn hash_stable( &self, __hcx: &mut __CTX, __hasher: &mut StableHasher<SipHasher128>, )
Source§impl Idx for VariantIdx
impl Idx for VariantIdx
Source§impl Ord for VariantIdx
impl Ord for VariantIdx
Source§fn cmp(&self, other: &VariantIdx) -> Ordering
fn cmp(&self, other: &VariantIdx) -> Ordering
1.21.0 · Source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
Source§impl PartialEq for VariantIdx
impl PartialEq for VariantIdx
Source§impl PartialOrd for VariantIdx
impl PartialOrd for VariantIdx
Source§impl Step for VariantIdx
impl Step for VariantIdx
Source§fn steps_between(start: &VariantIdx, end: &VariantIdx) -> (usize, Option<usize>)
fn steps_between(start: &VariantIdx, end: &VariantIdx) -> (usize, Option<usize>)
step_trait
)start
to end
like Iterator::size_hint()
. Read moreSource§fn forward_checked(start: VariantIdx, u: usize) -> Option<VariantIdx>
fn forward_checked(start: VariantIdx, u: usize) -> Option<VariantIdx>
step_trait
)Source§fn backward_checked(start: VariantIdx, u: usize) -> Option<VariantIdx>
fn backward_checked(start: VariantIdx, u: usize) -> Option<VariantIdx>
step_trait
)Source§fn forward(start: Self, count: usize) -> Self
fn forward(start: Self, count: usize) -> Self
step_trait
)Source§unsafe fn forward_unchecked(start: Self, count: usize) -> Self
unsafe fn forward_unchecked(start: Self, count: usize) -> Self
step_trait
)Source§fn backward(start: Self, count: usize) -> Self
fn backward(start: Self, count: usize) -> Self
step_trait
)Source§unsafe fn backward_unchecked(start: Self, count: usize) -> Self
unsafe fn backward_unchecked(start: Self, count: usize) -> Self
step_trait
)impl Copy for VariantIdx
impl Eq for VariantIdx
impl StructuralPartialEq for VariantIdx
Auto Trait Implementations§
impl DynSend for VariantIdx
impl DynSync for VariantIdx
impl Freeze for VariantIdx
impl RefUnwindSafe for VariantIdx
impl Send for VariantIdx
impl Sync for VariantIdx
impl Unpin for VariantIdx
impl UnwindSafe for VariantIdx
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
Source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
Source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
Source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
Source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
Source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
Source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.Source§impl<T> Instrument for T
impl<T> Instrument for T
Source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
Source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
Source§impl<T> IntoEither for T
impl<T> IntoEither for T
Source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moreSource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moreSource§impl<T> Pointable for T
impl<T> Pointable for T
Source§impl<T> WithSubscriber for T
impl<T> WithSubscriber for T
Source§fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
Source§fn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
impl<'a, T> Captures<'a> for Twhere
T: ?Sized,
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