Struct rustc_trait_selection::traits::specialize::specialization_graph::Graph
source · pub struct Graph {
pub parent: UnordMap<DefId, DefId>,
pub children: UnordMap<DefId, Children>,
pub has_errored: Option<ErrorGuaranteed>,
}
Expand description
A per-trait graph of impls in specialization order. At the moment, this graph forms a tree rooted with the trait itself, with all other nodes representing impls, and parent-child relationships representing specializations.
The graph provides two key services:
-
Construction. This implicitly checks for overlapping impls (i.e., impls that overlap but where neither specializes the other – an artifact of the simple “chain” rule.
-
Parent extraction. In particular, the graph can give you the immediate parents of a given specializing impl, which is needed for extracting default items amongst other things. In the simple “chain” rule, every impl has at most one parent.
Fields§
§parent: UnordMap<DefId, DefId>
All impls have a parent; the “root” impls have as their parent the def_id
of the trait.
children: UnordMap<DefId, Children>
The “root” impls are found by looking up the trait’s def_id.
has_errored: Option<ErrorGuaranteed>
Whether an error was emitted while constructing the graph.
Trait Implementations§
source§impl<'tcx> GraphExt<'tcx> for Graph
impl<'tcx> GraphExt<'tcx> for Graph
source§fn insert(
&mut self,
tcx: TyCtxt<'tcx>,
impl_def_id: DefId,
overlap_mode: OverlapMode
) -> Result<Option<FutureCompatOverlapError<'tcx>>, OverlapError<'tcx>>
fn insert( &mut self, tcx: TyCtxt<'tcx>, impl_def_id: DefId, overlap_mode: OverlapMode ) -> Result<Option<FutureCompatOverlapError<'tcx>>, OverlapError<'tcx>>
Insert a local impl into the specialization graph. If an existing impl
conflicts with it (has overlap, but neither specializes the other),
information about the area of overlap is returned in the Err
.
Auto Trait Implementations§
impl RefUnwindSafe for Graph
impl Send for Graph
impl Sync for Graph
impl Unpin for Graph
impl UnwindSafe for Graph
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
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: 72 bytes