Struct rustc_borrowck::constraints::OutlivesConstraintSet

pub(crate) struct OutlivesConstraintSet<'tcx> {
    outlives: IndexVec<OutlivesConstraintIndex, OutlivesConstraint<'tcx>>,
}

A set of NLL region constraints. These include “outlives” constraints of the form R1: R2. Each constraint is identified by a unique OutlivesConstraintIndex and you can index into the set (constraint_set[i]) to access the constraint details.

Fields

outlives: IndexVec<OutlivesConstraintIndex, OutlivesConstraint<'tcx>>

Implementations

impl<'tcx> OutlivesConstraintSet<'tcx>

pub(crate) fn push(&mut self, constraint: OutlivesConstraint<'tcx>)

pub(crate) fn graph(&self, num_region_vars: usize) -> ConstraintGraph<Normal>

Constructs a “normal” graph from the constraint set; the graph makes it easy to find the constraints affecting a particular region.

N.B., this graph contains a “frozen” view of the current constraints. Any new constraints added to the OutlivesConstraintSet after the graph is built will not be present in the graph.

pub(crate) fn reverse_graph(
    &self,
    num_region_vars: usize
) -> ConstraintGraph<Reverse>

Like graph, but constraints a reverse graph where R1: R2 represents an edge R2 -> R1.

pub(crate) fn compute_sccs(
    &self,
    constraint_graph: &ConstraintGraph<Normal>,
    static_region: RegionVid
) -> Sccs<RegionVid, ConstraintSccIndex>

Computes cycles (SCCs) in the graph of regions. In particular, find all regions R1, R2 such that R1: R2 and R2: R1 and group them into an SCC, and find the relationships between SCCs.

pub(crate) fn outlives(
    &self
) -> &IndexVec<OutlivesConstraintIndex, OutlivesConstraint<'tcx>>

Trait Implementations

impl<'tcx> Clone for OutlivesConstraintSet<'tcx>

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

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'tcx> Default for OutlivesConstraintSet<'tcx>

fn default() -> OutlivesConstraintSet<'tcx>

Returns the “default value” for a type.

impl<'tcx> Index<OutlivesConstraintIndex> for OutlivesConstraintSet<'tcx>

type Output = OutlivesConstraint<'tcx>

The returned type after indexing.

fn index(&self, i: OutlivesConstraintIndex) -> &Self::Output

Performs the indexing (container[index]) operation.

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: 24 bytes