Struct aster_frame::collections::xarray::Cursor

pub struct Cursor<'a, I, M>
where
    I: ItemEntry,
    M: Into<XMark>,
{ /* private fields */ }

A Cursor can traverse in the XArray by setting or increasing the target index and can perform read-only operations to the target item represented by the target index.

Cursors act like shared references, so multiple cursors are allowed to operate on a single XArray at the same time.

The typical way to obtain a Cursor instance is to call XArray::cursor.

Implementations

impl<'a, I, M> Cursor<'a, I, M>

where I: ItemEntry, M: Into<XMark>,

pub fn reset_to(&mut self, index: u64)

Resets the target index to index.

Once set, the cursor will be positioned on the corresponding leaf node, if the leaf node exists.

pub fn index(&self) -> u64

Returns the target index of the cursor.

pub fn next(&mut self)

Increases the target index of the cursor by one.

Once increased, the cursor will be positioned on the corresponding leaf node, if the leaf node exists.

pub fn load(&mut self) -> Option<<I as ItemEntry>::Ref<'a>>

Loads the item at the target index.

If the target item exists, this method will return a ItemEntry::Ref that acts exactly like a &'a I wrapped in Some(_). Otherwises, it will return None.

pub fn is_marked(&mut self, mark: M) -> bool

Checks whether the target item is marked with the input mark.

If the target item does not exist, this method will also return false.