Enum rustc_middle::ty::consts::kind::ConstKind [−][src]
pub enum ConstKind<'tcx> { Param(ParamConst), Infer(InferConst<'tcx>), Bound(DebruijnIndex, BoundVar), Placeholder(PlaceholderConst<'tcx>), Unevaluated(Unevaluated<'tcx>), Value(ConstValue<'tcx>), Error(DelaySpanBugEmitted), }
Represents a constant in Rust.
Variants
Param(ParamConst)
A const generic parameter.
Infer(InferConst<'tcx>)
Infer the value of the const.
Bound(DebruijnIndex, BoundVar)
Bound const variable, used only when preparing a trait query.
Placeholder(PlaceholderConst<'tcx>)
A placeholder const - universally quantified higher-ranked const.
Unevaluated(Unevaluated<'tcx>)
Used in the HIR by using Unevaluated
everywhere and later normalizing to one of the other
variants when the code is monomorphic enough for that.
Value(ConstValue<'tcx>)
Used to hold computed value.
Error(DelaySpanBugEmitted)
A placeholder for a const which could not be computed; this is propagated to avoid useless error messages.
Implementations
impl<'tcx> ConstKind<'tcx>
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pub fn try_to_value(self) -> Option<ConstValue<'tcx>>
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pub fn try_to_scalar(self) -> Option<Scalar>
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pub fn try_to_scalar_int(self) -> Option<ScalarInt>
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pub fn try_to_bits(self, size: Size) -> Option<u128>
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pub fn try_to_bool(self) -> Option<bool>
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pub fn try_to_machine_usize(self, tcx: TyCtxt<'tcx>) -> Option<u64>
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impl<'tcx> ConstKind<'tcx>
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pub fn eval(self, tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>) -> Self
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Tries to evaluate the constant if it is Unevaluated
. If that doesn’t succeed, return the
unevaluated constant.
pub(super) fn try_eval(
self,
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>
) -> Option<Result<ConstValue<'tcx>, ErrorReported>>
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self,
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>
) -> Option<Result<ConstValue<'tcx>, ErrorReported>>
Tries to evaluate the constant if it is Unevaluated
. If that isn’t possible or necessary
return None
.
Trait Implementations
impl<'tcx> Clone for ConstKind<'tcx>
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impl<'tcx> Copy for ConstKind<'tcx>
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impl<'tcx> Debug for ConstKind<'tcx>
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impl<'tcx, __D: TyDecoder<'tcx>> Decodable<__D> for ConstKind<'tcx>
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impl<'tcx, __E: TyEncoder<'tcx>> Encodable<__E> for ConstKind<'tcx>
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impl<'tcx> Eq for ConstKind<'tcx>
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impl<'tcx> Hash for ConstKind<'tcx>
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fn hash<__H: Hasher>(&self, state: &mut __H)
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pub fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0[src]
H: Hasher,
impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for ConstKind<'tcx>
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fn hash_stable(
&self,
__hcx: &mut StableHashingContext<'__ctx>,
__hasher: &mut StableHasher
)
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&self,
__hcx: &mut StableHashingContext<'__ctx>,
__hasher: &mut StableHasher
)
impl<'tcx> Ord for ConstKind<'tcx>
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fn cmp(&self, other: &ConstKind<'tcx>) -> Ordering
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#[must_use]pub fn max(self, other: Self) -> Self
1.21.0[src]
#[must_use]pub fn min(self, other: Self) -> Self
1.21.0[src]
#[must_use]pub fn clamp(self, min: Self, max: Self) -> Self
1.50.0[src]
impl<'tcx> PartialEq<ConstKind<'tcx>> for ConstKind<'tcx>
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fn eq(&self, other: &ConstKind<'tcx>) -> bool
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fn ne(&self, other: &ConstKind<'tcx>) -> bool
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impl<'tcx> PartialOrd<ConstKind<'tcx>> for ConstKind<'tcx>
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fn partial_cmp(&self, other: &ConstKind<'tcx>) -> Option<Ordering>
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#[must_use]pub fn lt(&self, other: &Rhs) -> bool
1.0.0[src]
#[must_use]pub fn le(&self, other: &Rhs) -> bool
1.0.0[src]
#[must_use]pub fn gt(&self, other: &Rhs) -> bool
1.0.0[src]
#[must_use]pub fn ge(&self, other: &Rhs) -> bool
1.0.0[src]
impl<'tcx> StructuralEq for ConstKind<'tcx>
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impl<'tcx> StructuralPartialEq for ConstKind<'tcx>
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impl<'tcx> TypeFoldable<'tcx> for ConstKind<'tcx>
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fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self
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fn super_visit_with<V: TypeVisitor<'tcx>>(
&self,
visitor: &mut V
) -> ControlFlow<V::BreakTy>
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&self,
visitor: &mut V
) -> ControlFlow<V::BreakTy>
fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self
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fn visit_with<V: TypeVisitor<'tcx>>(
&self,
visitor: &mut V
) -> ControlFlow<V::BreakTy>
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&self,
visitor: &mut V
) -> ControlFlow<V::BreakTy>
fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
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fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool
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fn has_escaping_bound_vars(&self) -> bool
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fn has_type_flags(&self, flags: TypeFlags) -> bool
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fn has_projections(&self) -> bool
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fn has_opaque_types(&self) -> bool
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fn references_error(&self) -> bool
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fn has_param_types_or_consts(&self) -> bool
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fn has_infer_regions(&self) -> bool
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fn has_infer_types(&self) -> bool
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fn has_infer_types_or_consts(&self) -> bool
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fn needs_infer(&self) -> bool
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fn has_placeholders(&self) -> bool
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fn needs_subst(&self) -> bool
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fn has_free_regions(&self) -> bool
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fn has_erased_regions(&self) -> bool
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fn has_erasable_regions(&self) -> bool
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fn is_global(&self) -> bool
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fn has_late_bound_regions(&self) -> bool
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fn still_further_specializable(&self) -> bool
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Auto Trait Implementations
impl<'tcx> !RefUnwindSafe for ConstKind<'tcx>
impl<'tcx> !Send for ConstKind<'tcx>
impl<'tcx> !Sync for ConstKind<'tcx>
impl<'tcx> Unpin for ConstKind<'tcx>
impl<'tcx> !UnwindSafe for ConstKind<'tcx>
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<'tcx, T> ArenaAllocatable<'tcx, ()> for T where
T: Copy,
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T: Copy,
pub fn allocate_on(Self, &'a Arena<'tcx>) -> &'a mut T
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pub fn allocate_from_iter(
&'a Arena<'tcx>,
impl IntoIterator<Item = T>
) -> &'a mut [T]ⓘ
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&'a Arena<'tcx>,
impl IntoIterator<Item = T>
) -> &'a mut [T]ⓘ
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<'a, T> Captures<'a> for T where
T: ?Sized,
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T: ?Sized,
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> MaybeResult<T> for T
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type Error = !
pub fn from(Result<T, <T as MaybeResult<T>>::Error>) -> T
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pub fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>
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impl<'tcx, T> Subst<'tcx> for T where
T: TypeFoldable<'tcx>,
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T: TypeFoldable<'tcx>,
pub fn subst_spanned(Self, TyCtxt<'tcx>, &[GenericArg<'tcx>], Option<Span>) -> T
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fn subst(self, tcx: TyCtxt<'tcx>, substs: &[GenericArg<'tcx>]) -> Self
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impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.