pub(crate) struct InferCtxtUndoLogs<'tcx> {
    logs: Vec<UndoLog<'tcx>>,
    num_open_snapshots: usize,
}
Expand description

The combined undo log for all the various unification tables. For each change to the storage for any kind of inference variable, we record an UndoLog entry in the vector here.

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§logs: Vec<UndoLog<'tcx>>§num_open_snapshots: usize

Implementations§

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impl<'tcx> InferCtxtUndoLogs<'tcx>

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pub fn start_snapshot(&mut self) -> Snapshot<'tcx>

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pub(crate) fn region_constraints_in_snapshot( &self, s: &Snapshot<'tcx> ) -> impl Iterator<Item = &UndoLog<'tcx>> + Clone

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pub(crate) fn opaque_types_in_snapshot(&self, s: &Snapshot<'tcx>) -> bool

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fn assert_open_snapshot(&self, snapshot: &Snapshot<'tcx>)

Trait Implementations§

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impl<'tcx> Clone for InferCtxtUndoLogs<'tcx>

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

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fn default() -> InferCtxtUndoLogs<'tcx>

Returns the “default value” for a type. Read more
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impl<'tcx> Index<usize> for InferCtxtUndoLogs<'tcx>

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type Output = UndoLog<'tcx>

The returned type after indexing.
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fn index(&self, key: usize) -> &Self::Output

Performs the indexing (container[index]) operation. Read more
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impl<'tcx> IndexMut<usize> for InferCtxtUndoLogs<'tcx>

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fn index_mut(&mut self, key: usize) -> &mut Self::Output

Performs the mutable indexing (container[index]) operation. Read more
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impl<'tcx, T> UndoLogs<T> for InferCtxtUndoLogs<'tcx>
where UndoLog<'tcx>: From<T>,

The UndoLogs trait defines how we undo a particular kind of action (of type T). We can undo any action that is convertible into an UndoLog (per the From impls above).

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fn num_open_snapshots(&self) -> usize

How many open snapshots this undo log currently has
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fn push(&mut self, undo: T)

Pushes a new “undo item” onto the undo log. This method is invoked when some action is taken (e.g., a variable is unified). It records the info needed to reverse that action should an enclosing snapshot be rolleod back.
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fn clear(&mut self)

Removes all items from the undo log.
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fn extend<J>(&mut self, undos: J)
where Self: Sized, J: IntoIterator<Item = T>,

Extends the undo log with many undos.
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fn in_snapshot(&self) -> bool

True if a snapshot has started, false otherwise

Auto Trait Implementations§

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impl<'tcx> DynSend for InferCtxtUndoLogs<'tcx>

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impl<'tcx> DynSync for InferCtxtUndoLogs<'tcx>

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

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impl<'tcx> Send for InferCtxtUndoLogs<'tcx>

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impl<'tcx> Sync for InferCtxtUndoLogs<'tcx>

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impl<'tcx> Unpin for InferCtxtUndoLogs<'tcx>

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

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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where T: 'static + ?Sized,

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fn borrow(&self) -> &T

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

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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<_>>()).

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type Output = R

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

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

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const ALIGN: usize = _

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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