pub struct RegionConstraintStorage<'tcx> {
    var_infos: IndexVec<RegionVid, RegionVariableInfo>,
    data: RegionConstraintData<'tcx>,
    lubs: FxHashMap<TwoRegions<'tcx>, RegionVid>,
    glbs: FxHashMap<TwoRegions<'tcx>, RegionVid>,
    pub(super) unification_table: UnificationTableStorage<RegionVidKey<'tcx>>,
    any_unifications: bool,
}

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§var_infos: IndexVec<RegionVid, RegionVariableInfo>

For each RegionVid, the corresponding RegionVariableOrigin.

§data: RegionConstraintData<'tcx>§lubs: FxHashMap<TwoRegions<'tcx>, RegionVid>

For a given pair of regions (R1, R2), maps to a region R3 that is designated as their LUB (edges R1 <= R3 and R2 <= R3 exist). This prevents us from making many such regions.

§glbs: FxHashMap<TwoRegions<'tcx>, RegionVid>

For a given pair of regions (R1, R2), maps to a region R3 that is designated as their GLB (edges R3 <= R1 and R3 <= R2 exist). This prevents us from making many such regions.

§unification_table: UnificationTableStorage<RegionVidKey<'tcx>>

When we add a R1 == R2 constraint, we currently add (a) edges R1 <= R2 and R2 <= R1 and (b) we unify the two regions in this table. You can then call opportunistic_resolve_var early which will map R1 and R2 to some common region (i.e., either R1 or R2). This is important when fulfillment, dropck and other such code is iterating to a fixed point, because otherwise we sometimes would wind up with a fresh stream of region variables that have been equated but appear distinct.

§any_unifications: bool

a flag set to true when we perform any unifications; this is used to micro-optimize take_and_reset_data

Implementations§

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impl<'tcx> RegionConstraintStorage<'tcx>

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pub fn new() -> Self

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pub(crate) fn with_log<'a>(
&'a mut self,
undo_log: &'a mut InferCtxtUndoLogs<'tcx>
) -> RegionConstraintCollector<'a, 'tcx>

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fn rollback_undo_entry(&mut self, undo_entry: UndoLog<'tcx>)

Trait Implementations§

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impl<'tcx> Clone for RegionConstraintStorage<'tcx>

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fn clone(&self) -> RegionConstraintStorage<'tcx>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'tcx> Default for RegionConstraintStorage<'tcx>

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fn default() -> RegionConstraintStorage<'tcx>

Returns the “default value” for a type. Read more
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impl<'tcx> Rollback<UndoLog<'tcx>> for RegionConstraintStorage<'tcx>

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fn reverse(&mut self, undo: UndoLog<'tcx>)

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impl<'tcx> !RefUnwindSafe for RegionConstraintStorage<'tcx>

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impl<'tcx> !Send for RegionConstraintStorage<'tcx>

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impl<'tcx> !Sync for RegionConstraintStorage<'tcx>

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impl<'tcx> Unpin for RegionConstraintStorage<'tcx>

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impl<'tcx> !UnwindSafe for RegionConstraintStorage<'tcx>

Blanket Implementations§

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impl<T> Any for Twhere
T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere
T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere
T: ?Sized,

const: unstable · source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere
U: From<T>,

const: unstable · source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere
T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere
U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere
U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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: 248 bytes