pub(crate) struct UniversalRegionRelations<'tcx> {
    universal_regions: Rc<UniversalRegions<'tcx>>,
    outlives: TransitiveRelation<RegionVid>,
    inverse_outlives: TransitiveRelation<RegionVid>,
}

Fields§

§universal_regions: Rc<UniversalRegions<'tcx>>§outlives: TransitiveRelation<RegionVid>

Stores the outlives relations that are known to hold from the implied bounds, in-scope where-clauses, and that sort of thing.

§inverse_outlives: TransitiveRelation<RegionVid>

This is the <= relation; that is, if a: b, then b <= a, and we store that here. This is useful when figuring out how to express some local region in terms of external regions our caller will understand.

Implementations§

source§

impl UniversalRegionRelations<'_>

source

pub(crate) fn postdom_upper_bound( &self, fr1: RegionVid, fr2: RegionVid ) -> RegionVid

Given two universal regions, returns the postdominating upper-bound (effectively the least upper bound).

(See TransitiveRelation::postdom_upper_bound for details on the postdominating upper bound in general.)

source

pub(crate) fn non_local_upper_bounds(&self, fr: RegionVid) -> Vec<RegionVid>

Finds an “upper bound” for fr that is not local. In other words, returns the smallest (*) known region fr1 that (a) outlives fr and (b) is not local.

(*) If there are multiple competing choices, we return all of them.

source

pub(crate) fn non_local_lower_bound(&self, fr: RegionVid) -> Option<RegionVid>

Finds a “lower bound” for fr that is not local. In other words, returns the largest (*) known region fr1 that (a) is outlived by fr and (b) is not local.

(*) If there are multiple competing choices, we pick the “postdominating” one. See TransitiveRelation::postdom_upper_bound for details.

source

fn non_local_bounds( &self, relation: &TransitiveRelation<RegionVid>, fr0: RegionVid ) -> Vec<RegionVid>

Helper for non_local_upper_bounds and non_local_lower_bounds. Repeatedly invokes postdom_parent until we find something that is not local. Returns None if we never do so.

source

pub(crate) fn outlives(&self, fr1: RegionVid, fr2: RegionVid) -> bool

Returns true if fr1 is known to outlive fr2.

This will only ever be true for universally quantified regions.

source

pub(crate) fn regions_outlived_by(&self, fr1: RegionVid) -> Vec<RegionVid>

Returns a vector of free regions x such that fr1: x is known to hold.

source

pub(crate) fn known_outlives( &self ) -> impl Iterator<Item = (RegionVid, RegionVid)> + '_

Returns the non-transitive set of known outlives constraints between free regions.

Trait Implementations§

source§

impl<'tcx> Debug for UniversalRegionRelations<'tcx>

source§

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

§

impl<'tcx> !DynSend for UniversalRegionRelations<'tcx>

§

impl<'tcx> !DynSync for UniversalRegionRelations<'tcx>

§

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

§

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

§

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

§

impl<'tcx> Unpin for UniversalRegionRelations<'tcx>

§

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

Blanket Implementations§

source§

impl<T> Aligned for T

source§

const ALIGN: Alignment = _

Alignment of Self.
source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

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

Mutably borrows from an owned value. Read more
source§

impl<T, R> CollectAndApply<T, R> for T

source§

fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

§

type Output = R

§

impl<T> Filterable for T

§

fn filterable( self, filter_name: &'static str ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T> Instrument for T

source§

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
source§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
source§

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

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.

source§

impl<P> IntoQueryParam<P> for P

source§

impl<T> MaybeResult<T> for T

§

type Error = !

source§

fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

source§

fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

§

impl<T> Pointable for T

§

const ALIGN: usize = _

The alignment of pointer.
§

type Init = T

The type for initializers.
§

unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
§

unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
§

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
§

unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
source§

impl<T> Same for T

§

type Output = T

Should always be Self
source§

impl<'tcx, T> ToPredicate<'tcx, T> for T

source§

fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

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

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

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

The type returned in the event of a conversion error.
source§

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

Performs the conversion.
§

impl<V, T> VZip<V> for T
where V: MultiLane<T>,

§

fn vzip(self) -> V

source§

impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

source§

default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed ) -> T

source§

impl<T> WithSubscriber for T

source§

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

impl<'a, T> Captures<'a> for T
where T: ?Sized,

§

impl<T> ErasedDestructor for T
where T: 'static,

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: 264 bytes