Struct sanakirja::Txn

pub struct Txn<E: Borrow<Env>> { /* fields omitted */ }

An immutable transaction.

Trait Implementations

impl<E: Borrow<Env>> Drop for Txn<E>

fn drop(&mut self)

Executes the destructor for this type.

impl<E: Borrow<Env>> LoadPage for Txn<E>

type Error = Error

fn load_page(&self, off: u64) -> Result<CowPage, Self::Error>

Find the appropriate map segment

fn rc(&self, _: u64) -> Result<u64, Self::Error>

Reference-counting. Since reference-counts are designed to be storable into B trees by external allocators, pages referenced once aren't stored, and hence are indistinguishable from pages that are never referenced. The default implementation returns 0.

impl<E: Borrow<Env>> RootDb for Txn<E>

fn root_db<K: Storable + ?Sized, V: Storable + ?Sized, P: BTreePage<K, V>>(
    &self,
    n: usize
) -> Option<Db_<K, V, P>>

This is a straightforward implementation of just accessing index n.