Struct rustc_target::abi::VariantIdx
source · pub struct VariantIdx {
private: 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: 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 fn from_usize(value: usize) -> Self
pub const fn from_usize(value: usize) -> Self
sourcepub const unsafe fn from_u32_unchecked(value: u32) -> Self
pub const unsafe fn from_u32_unchecked(value: u32) -> Self
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§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 From<VariantIdx> for u32
impl From<VariantIdx> for u32
source§fn from(v: VariantIdx) -> u32
fn from(v: VariantIdx) -> u32
source§impl From<VariantIdx> for usize
impl From<VariantIdx> for usize
source§fn from(v: VariantIdx) -> usize
fn from(v: VariantIdx) -> usize
source§impl From<u32> for VariantIdx
impl From<u32> for VariantIdx
source§impl From<usize> for VariantIdx
impl From<usize> for 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)
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<VariantIdx> for VariantIdx
impl PartialEq<VariantIdx> for VariantIdx
source§fn eq(&self, other: &VariantIdx) -> bool
fn eq(&self, other: &VariantIdx) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<VariantIdx> for VariantIdx
impl PartialOrd<VariantIdx> for VariantIdx
source§fn partial_cmp(&self, other: &VariantIdx) -> Option<Ordering>
fn partial_cmp(&self, other: &VariantIdx) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl Step for VariantIdx
impl Step for VariantIdx
source§fn steps_between(start: &Self, end: &Self) -> Option<usize>
fn steps_between(start: &Self, end: &Self) -> Option<usize>
step_trait
)source§fn forward_checked(start: Self, u: usize) -> Option<Self>
fn forward_checked(start: Self, u: usize) -> Option<Self>
step_trait
)source§fn backward_checked(start: Self, u: usize) -> Option<Self>
fn backward_checked(start: Self, u: usize) -> Option<Self>
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 StructuralEq for VariantIdx
impl StructuralPartialEq for VariantIdx
impl TrustedStep for VariantIdx
Auto Trait Implementations§
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
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