[−][src]Struct chalk_ir::BoundVar
Identifies a particular bound variable within a binder.
Variables are identified by the combination of a DebruijnIndex
,
which identifies the binder, and an index within that binder.
Consider this case:
forall<'a, 'b> { forall<'c, 'd> { ... } }
Within the ...
term:
- the variable
'a
have a debruijn index of 1 and index 0 - the variable
'b
have a debruijn index of 1 and index 1 - the variable
'c
have a debruijn index of 0 and index 0 - the variable
'd
have a debruijn index of 0 and index 1
The variables 'a
and 'b
both have debruijn index of 1 because,
counting out, they are the 2nd binder enclosing ...
. The indices
identify the location within that binder.
The variables 'c
and 'd
both have debruijn index of 0 because
they appear in the innermost binder enclosing the ...
. The
indices identify the location within that binder.
Fields
debruijn: DebruijnIndex
Debruijn index, which identifies the binder.
index: usize
Index within the binder.
Implementations
impl BoundVar
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pub fn new(debruijn: DebruijnIndex, index: usize) -> Self
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Creates a new bound variable.
pub fn to_ty<I: Interner>(self, interner: &I) -> Ty<I>
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Casts the bound variable to a type.
pub fn to_lifetime<I: Interner>(self, interner: &I) -> Lifetime<I>
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Wrap the bound variable in a lifetime.
pub fn to_const<I: Interner>(self, interner: &I, ty: Ty<I>) -> Const<I>
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Wraps the bound variable in a constant.
pub fn bound_within(self, outer_binder: DebruijnIndex) -> bool
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True if this variable is bound within the amount
innermost binders.
#[must_use]pub fn shifted_in(self) -> Self
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Adjusts the debruijn index (see DebruijnIndex::shifted_in
).
#[must_use]pub fn shifted_in_from(self, outer_binder: DebruijnIndex) -> Self
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Adjusts the debruijn index (see DebruijnIndex::shifted_in
).
#[must_use]pub fn shifted_out(self) -> Option<Self>
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Adjusts the debruijn index (see DebruijnIndex::shifted_in
).
#[must_use]pub fn shifted_out_to(self, outer_binder: DebruijnIndex) -> Option<Self>
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Adjusts the debruijn index (see DebruijnIndex::shifted_in
).
pub fn index_if_innermost(self) -> Option<usize>
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Return the index of the bound variable, but only if it is bound
at the innermost binder. Otherwise, returns None
.
pub fn index_if_bound_at(self, debruijn: DebruijnIndex) -> Option<usize>
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Return the index of the bound variable, but only if it is bound
at the innermost binder. Otherwise, returns None
.
Trait Implementations
impl Clone for BoundVar
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impl Copy for BoundVar
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impl Debug for BoundVar
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impl Eq for BoundVar
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impl Hash for BoundVar
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pub 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,
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H: Hasher,
impl Ord for BoundVar
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pub fn cmp(&self, other: &BoundVar) -> 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 PartialEq<BoundVar> for BoundVar
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impl PartialOrd<BoundVar> for BoundVar
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pub fn partial_cmp(&self, other: &BoundVar) -> Option<Ordering>
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pub fn lt(&self, other: &BoundVar) -> bool
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pub fn le(&self, other: &BoundVar) -> bool
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pub fn gt(&self, other: &BoundVar) -> bool
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pub fn ge(&self, other: &BoundVar) -> bool
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impl StructuralEq for BoundVar
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impl StructuralPartialEq for BoundVar
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Auto Trait Implementations
impl RefUnwindSafe for BoundVar
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impl Send for BoundVar
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impl Sync for BoundVar
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impl Unpin for BoundVar
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impl UnwindSafe for BoundVar
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Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
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<T> Cast for T
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pub fn cast<U>(self, interner: &U::Interner) -> U where
Self: CastTo<U>,
U: HasInterner,
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Self: CastTo<U>,
U: HasInterner,
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> 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>,