Struct rustc_infer::infer::undo_log::InferCtxtUndoLogs
source · 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.
Fields§
§logs: Vec<UndoLog<'tcx>>
§num_open_snapshots: usize
Implementations§
source§impl<'tcx> InferCtxtUndoLogs<'tcx>
impl<'tcx> InferCtxtUndoLogs<'tcx>
pub fn start_snapshot(&mut self) -> Snapshot<'tcx>
pub(crate) fn region_constraints_in_snapshot( &self, s: &Snapshot<'tcx> ) -> impl Iterator<Item = &UndoLog<'tcx>> + Clone
pub(crate) fn opaque_types_in_snapshot(&self, s: &Snapshot<'tcx>) -> bool
fn assert_open_snapshot(&self, snapshot: &Snapshot<'tcx>)
Trait Implementations§
source§impl<'tcx> Clone for InferCtxtUndoLogs<'tcx>
impl<'tcx> Clone for InferCtxtUndoLogs<'tcx>
source§fn clone(&self) -> InferCtxtUndoLogs<'tcx>
fn clone(&self) -> InferCtxtUndoLogs<'tcx>
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl<'tcx> Default for InferCtxtUndoLogs<'tcx>
impl<'tcx> Default for InferCtxtUndoLogs<'tcx>
source§fn default() -> InferCtxtUndoLogs<'tcx>
fn default() -> InferCtxtUndoLogs<'tcx>
Returns the “default value” for a type. Read more
source§impl<'tcx> Index<usize> for InferCtxtUndoLogs<'tcx>
impl<'tcx> Index<usize> for InferCtxtUndoLogs<'tcx>
source§impl<'tcx> IndexMut<usize> for InferCtxtUndoLogs<'tcx>
impl<'tcx> IndexMut<usize> for InferCtxtUndoLogs<'tcx>
source§impl<'tcx, T> UndoLogs<T> for InferCtxtUndoLogs<'tcx>where
UndoLog<'tcx>: From<T>,
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).
source§fn num_open_snapshots(&self) -> usize
fn num_open_snapshots(&self) -> usize
How many open snapshots this undo log currently has
source§fn push(&mut self, undo: T)
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.
source§fn extend<J>(&mut self, undos: J)where
Self: Sized,
J: IntoIterator<Item = T>,
fn extend<J>(&mut self, undos: J)where Self: Sized, J: IntoIterator<Item = T>,
Extends the undo log with many undos.
source§fn in_snapshot(&self) -> bool
fn in_snapshot(&self) -> bool
True if a snapshot has started, false otherwise
Auto Trait Implementations§
impl<'tcx> !RefUnwindSafe for InferCtxtUndoLogs<'tcx>
impl<'tcx> !Send for InferCtxtUndoLogs<'tcx>
impl<'tcx> !Sync for InferCtxtUndoLogs<'tcx>
impl<'tcx> Unpin for InferCtxtUndoLogs<'tcx>
impl<'tcx> !UnwindSafe for InferCtxtUndoLogs<'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
Mutably borrows from an owned value. Read more
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