Struct rustc_data_structures::undo_log::VecLog
source · pub struct VecLog<T> {
log: Vec<T>,
num_open_snapshots: usize,
}
Expand description
A basic undo log.
Fields§
§log: Vec<T>
§num_open_snapshots: usize
Trait Implementations§
source§impl<T> Snapshots<T> for VecLog<T>
impl<T> Snapshots<T> for VecLog<T>
type Snapshot = Snapshot
source§fn has_changes(&self, snapshot: &Snapshot) -> bool
fn has_changes(&self, snapshot: &Snapshot) -> bool
Returns true if
self
has made any changes since snapshot started.source§fn actions_since_snapshot(&self, snapshot: &Snapshot) -> &[T]
fn actions_since_snapshot(&self, snapshot: &Snapshot) -> &[T]
Returns the slice of actions that were taken since the snapshot began.
source§fn start_snapshot(&mut self) -> Snapshot
fn start_snapshot(&mut self) -> Snapshot
Starts a new snapshot. That snapshot must eventually either be committed via a call to
commit or rollback via rollback_to. Snapshots can be nested (i.e., you can start a snapshot
whilst another snapshot is in progress) but you must then commit or rollback the inner
snapshot before attempting to commit or rollback the outer snapshot.
source§impl<T> UndoLogs<T> for VecLog<T>
impl<T> UndoLogs<T> for VecLog<T>
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 rolled back.
source§fn in_snapshot(&self) -> bool
fn in_snapshot(&self) -> bool
True if a snapshot has started, false otherwise
source§fn extend<I>(&mut self, undos: I)where
Self: Sized,
I: IntoIterator<Item = T>,
fn extend<I>(&mut self, undos: I)where
Self: Sized,
I: IntoIterator<Item = T>,
Extends the undo log with many undos.
Auto Trait Implementations§
impl<T> Freeze for VecLog<T>
impl<T> RefUnwindSafe for VecLog<T>where
T: RefUnwindSafe,
impl<T> Send for VecLog<T>where
T: Send,
impl<T> Sync for VecLog<T>where
T: Sync,
impl<T> Unpin for VecLog<T>where
T: Unpin,
impl<T> UnwindSafe for VecLog<T>where
T: UnwindSafe,
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
source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
🔬This is a nightly-only experimental API. (
clone_to_uninit
)source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
Converts
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
Converts
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§impl<T> WithSubscriber for T
impl<T> WithSubscriber for T
source§fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
source§fn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
impl<'a, T> Captures<'a> for Twhere
T: ?Sized,
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