Enum IndexRef 

pub enum IndexRef<'idx> {
    Direct(&'idx mut Index),
    Shared(Rc<RefCell<Index>>),
}

A mutable index reference used by crate::Stream.

This enum abstracts over two index ownership patterns:

• Direct(&mut Index): the stream owns an exclusive mutable borrow of the index.
• Shared(Rc<RefCell<Index>>): the stream borrows the index through runtime-checked interior mutability, allowing aliasing within a single thread.

Use Direct when the stream is the only owner of the index. Use Shared when the same index must be accessed from multiple aliasing locations.

Variants

Direct(&'idx mut Index)

Shared(Rc<RefCell<Index>>)

Implementations

impl<'idx> IndexRef<'idx>

pub fn get(&self) -> Guard<'_>

Get a read-only view of the underlying index.

For Shared, this performs a RefCell::borrow and will panic if a mutable borrow is already active.

pub fn get_mut(&mut self) -> MutGuard<'_>

Get a mutable view of the underlying index.

For Shared, this performs a RefCell::borrow_mut and will panic if any other borrow is active.

Trait Implementations

impl<'idx> Debug for IndexRef<'idx>

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

Formats the value using the given formatter.