Struct rustc_data_structures::undo_log::VecLog

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pub struct VecLog<T> {
    log: Vec<T>,
    num_open_snapshots: usize,
}
Expand description

A basic undo log.

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§log: Vec<T>§num_open_snapshots: usize

Trait Implementations§

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impl<T> Clone for VecLog<T>
where T: Clone,

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fn clone(&self) -> VecLog<T>

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<T> Debug for VecLog<T>
where T: Debug,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl<T> Default for VecLog<T>

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fn default() -> VecLog<T>

Returns the “default value” for a type. Read more
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impl<T> Index<usize> for VecLog<T>

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type Output = T

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

Performs the indexing (container[index]) operation. Read more
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impl<T> Snapshots<T> for VecLog<T>

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type Snapshot = Snapshot

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fn has_changes(&self, snapshot: &Snapshot) -> bool

Returns true if self has made any changes since snapshot started.
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fn actions_since_snapshot(&self, snapshot: &Snapshot) -> &[T]

Returns the slice of actions that were taken since the snapshot began.
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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.
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fn rollback_to<R>(&mut self, values: impl FnOnce() -> R, snapshot: Snapshot)
where R: Rollback<T>,

Rollback (undo) the changes made to storage since the snapshot.
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fn commit(&mut self, snapshot: Snapshot)

Commit: keep the changes that have been made since the snapshot began
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impl<T> UndoLogs<T> for VecLog<T>

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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 rolled back.
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fn clear(&mut self)

Removes all items from the undo log.
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fn in_snapshot(&self) -> bool

True if a snapshot has started, false otherwise
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fn extend<I>(&mut self, undos: I)
where Self: Sized, I: IntoIterator<Item = T>,

Extends the undo log with many undos.

Auto Trait Implementations§

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impl<T> Freeze for VecLog<T>

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impl<T> RefUnwindSafe for VecLog<T>
where T: RefUnwindSafe,

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impl<T> Send for VecLog<T>
where T: Send,

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impl<T> Sync for VecLog<T>
where T: Sync,

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impl<T> Unpin for VecLog<T>
where T: Unpin,

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impl<T> UnwindSafe for VecLog<T>
where T: UnwindSafe,

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = const ALIGN: Alignment = Alignment::of::<Self>();

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> IntoEither for T

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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 more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

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 more
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where 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