Struct rustc_trait_selection::traits::TraitAliasExpander
source · pub struct TraitAliasExpander<'tcx> {
tcx: TyCtxt<'tcx>,
stack: Vec<TraitAliasExpansionInfo<'tcx>>,
}
Expand description
“Trait alias expansion” is the process of expanding a sequence of trait
references into another sequence by transitively following all trait
aliases. e.g. If you have bounds like Foo + Send
, a trait alias
trait Foo = Bar + Sync;
, and another trait alias
trait Bar = Read + Write
, then the bounds would expand to
Read + Write + Sync + Send
.
Expansion is done via a DFS (depth-first search), and the visited
field
is used to avoid cycles.
Fields§
§tcx: TyCtxt<'tcx>
§stack: Vec<TraitAliasExpansionInfo<'tcx>>
Implementations§
source§impl<'tcx> TraitAliasExpander<'tcx>
impl<'tcx> TraitAliasExpander<'tcx>
sourcefn expand(&mut self, item: &TraitAliasExpansionInfo<'tcx>) -> bool
fn expand(&mut self, item: &TraitAliasExpansionInfo<'tcx>) -> bool
If item
is a trait alias and its predicate has not yet been visited, then expands item
to the definition, pushes the resulting expansion onto self.stack
, and returns false
.
Otherwise, immediately returns true
if item
is a regular trait, or false
if it is a
trait alias.
The return value indicates whether item
should be yielded to the user.
Trait Implementations§
source§impl<'tcx> Iterator for TraitAliasExpander<'tcx>
impl<'tcx> Iterator for TraitAliasExpander<'tcx>
§type Item = TraitAliasExpansionInfo<'tcx>
type Item = TraitAliasExpansionInfo<'tcx>
source§fn size_hint(&self) -> (usize, Option<usize>)
fn size_hint(&self) -> (usize, Option<usize>)
source§fn next(&mut self) -> Option<TraitAliasExpansionInfo<'tcx>>
fn next(&mut self) -> Option<TraitAliasExpansionInfo<'tcx>>
source§fn next_chunk<const N: usize>(
&mut self
) -> Result<[Self::Item; N], IntoIter<Self::Item, N>>where
Self: Sized,
fn next_chunk<const N: usize>( &mut self ) -> Result<[Self::Item; N], IntoIter<Self::Item, N>>where Self: Sized,
iter_next_chunk
)N
values. Read more1.0.0 · source§fn count(self) -> usizewhere
Self: Sized,
fn count(self) -> usizewhere Self: Sized,
1.0.0 · source§fn last(self) -> Option<Self::Item>where
Self: Sized,
fn last(self) -> Option<Self::Item>where Self: Sized,
source§fn advance_by(&mut self, n: usize) -> Result<(), NonZeroUsize>
fn advance_by(&mut self, n: usize) -> Result<(), NonZeroUsize>
iter_advance_by
)n
elements. Read more1.0.0 · source§fn nth(&mut self, n: usize) -> Option<Self::Item>
fn nth(&mut self, n: usize) -> Option<Self::Item>
n
th element of the iterator. Read more1.28.0 · source§fn step_by(self, step: usize) -> StepBy<Self>where
Self: Sized,
fn step_by(self, step: usize) -> StepBy<Self>where Self: Sized,
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U: IntoIterator<Item = Self::Item>,
fn chain<U>(self, other: U) -> Chain<Self, <U as IntoIterator>::IntoIter>where Self: Sized, U: IntoIterator<Item = Self::Item>,
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Self: Sized,
U: IntoIterator,
fn zip<U>(self, other: U) -> Zip<Self, <U as IntoIterator>::IntoIter>where Self: Sized, U: IntoIterator,
source§fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G>where
Self: Sized,
G: FnMut() -> Self::Item,
fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G>where Self: Sized, G: FnMut() -> Self::Item,
iter_intersperse
)separator
between adjacent items of the original iterator. Read more1.0.0 · source§fn map<B, F>(self, f: F) -> Map<Self, F>where
Self: Sized,
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P: FnMut(&Self::Item) -> bool,
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fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P>where Self: Sized, P: FnMut(&Self::Item) -> bool,
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Self: Sized,
P: FnMut(Self::Item) -> Option<B>,
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fn skip(self, n: usize) -> Skip<Self>where Self: Sized,
n
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n
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Self: Sized,
F: FnMut(&mut St, Self::Item) -> Option<B>,
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U: IntoIterator,
F: FnMut(Self::Item) -> U,
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iter_map_windows
)f
for each contiguous window of size N
over
self
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,
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Self: Sized,
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)1.0.0 · source§fn partition<B, F>(self, f: F) -> (B, B)where
Self: Sized,
B: Default + Extend<Self::Item>,
F: FnMut(&Self::Item) -> bool,
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Self: Sized,
P: FnMut(Self::Item) -> bool,
fn is_partitioned<P>(self, predicate: P) -> boolwhere Self: Sized, P: FnMut(Self::Item) -> bool,
iter_is_partitioned
)true
precede all those that return false
. Read more1.27.0 · source§fn try_fold<B, F, R>(&mut self, init: B, f: F) -> Rwhere
Self: Sized,
F: FnMut(B, Self::Item) -> R,
R: Try<Output = B>,
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Self: Sized,
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R: Try<Output = ()>,
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Self: Sized,
F: FnMut(B, Self::Item) -> B,
fn fold<B, F>(self, init: B, f: F) -> Bwhere Self: Sized, F: FnMut(B, Self::Item) -> B,
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Self: Sized,
F: FnMut(Self::Item, Self::Item) -> Self::Item,
fn reduce<F>(self, f: F) -> Option<Self::Item>where Self: Sized, F: FnMut(Self::Item, Self::Item) -> Self::Item,
source§fn try_reduce<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<<R as Try>::Output>>>::TryTypewhere
Self: Sized,
F: FnMut(Self::Item, Self::Item) -> R,
R: Try<Output = Self::Item>,
<R as Try>::Residual: Residual<Option<Self::Item>>,
fn try_reduce<F, R>( &mut self, f: F ) -> <<R as Try>::Residual as Residual<Option<<R as Try>::Output>>>::TryTypewhere Self: Sized, F: FnMut(Self::Item, Self::Item) -> R, R: Try<Output = Self::Item>, <R as Try>::Residual: Residual<Option<Self::Item>>,
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)1.0.0 · source§fn all<F>(&mut self, f: F) -> boolwhere
Self: Sized,
F: FnMut(Self::Item) -> bool,
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Self: Sized,
F: FnMut(Self::Item) -> bool,
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Self: Sized,
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source§fn try_find<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryTypewhere
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F: FnMut(&Self::Item) -> R,
R: Try<Output = bool>,
<R as Try>::Residual: Residual<Option<Self::Item>>,
fn try_find<F, R>( &mut self, f: F ) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryTypewhere Self: Sized, F: FnMut(&Self::Item) -> R, R: Try<Output = bool>, <R as Try>::Residual: Residual<Option<Self::Item>>,
try_find
)1.0.0 · source§fn position<P>(&mut self, predicate: P) -> Option<usize>where
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1.6.0 · source§fn max_by_key<B, F>(self, f: F) -> Option<Self::Item>where
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Self: Sized,
F: FnMut(&Self::Item) -> B,
fn max_by_key<B, F>(self, f: F) -> Option<Self::Item>where B: Ord, Self: Sized, F: FnMut(&Self::Item) -> B,
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Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
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Self: Sized,
F: FnMut(&Self::Item) -> B,
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)N
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)Iterator
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Self: Sized,
fn partial_cmp<I>(self, other: I) -> Option<Ordering>where I: IntoIterator, Self::Item: PartialOrd<<I as IntoIterator>::Item>, Self: Sized,
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)Auto Trait Implementations§
impl<'tcx> !RefUnwindSafe for TraitAliasExpander<'tcx>
impl<'tcx> !Send for TraitAliasExpander<'tcx>
impl<'tcx> !Sync for TraitAliasExpander<'tcx>
impl<'tcx> Unpin for TraitAliasExpander<'tcx>
impl<'tcx> !UnwindSafe for TraitAliasExpander<'tcx>
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
source§impl<I> IntoIterator for Iwhere
I: Iterator,
impl<I> IntoIterator for Iwhere I: Iterator,
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: 32 bytes