Enum Either4

pub enum Either4<A, B, C, D> {
    A(A),
    B(B),
    C(C),
    D(D),
}

Variants

A(A)

B(B)

C(C)

D(D)

Trait Implementations

impl<A: Clone, B: Clone, C: Clone, D: Clone> Clone for Either4<A, B, C, D>

fn clone(&self) -> Either4<A, B, C, D>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<A: Debug, B: Debug, C: Debug, D: Debug> Debug for Either4<A, B, C, D>

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

Formats the value using the given formatter.

impl<A, B, C, D> Wal for Either4<A, B, C, D>

where A: Wal, B: Wal, C: Wal, D: Wal,

fn limit(&mut self, size: i64)

Set the WAL limit in pages

fn begin_read_txn(&mut self) -> Result<bool>

start a read transaction. Returns whether the in-memory page cache should be invalidated.

fn end_read_txn(&mut self)

fn find_frame(&mut self, page_no: NonZeroU32) -> Result<Option<NonZeroU32>>

locate the frame containing page page_no

fn read_frame(&mut self, frame_no: NonZeroU32, buffer: &mut [u8]) -> Result<()>

reads frame frame_no into buffer.

fn read_frame_raw( &mut self, frame_no: NonZeroU32, buffer: &mut [u8], ) -> Result<()>

reads frame frame_no including its frame header into buffer.

fn db_size(&self) -> u32

fn begin_write_txn(&mut self) -> Result<()>

fn end_write_txn(&mut self) -> Result<()>

fn undo<U: UndoHandler>(&mut self, handler: Option<&mut U>) -> Result<()>

fn savepoint(&mut self, rollback_data: &mut [u32])

fn savepoint_undo(&mut self, rollback_data: &mut [u32]) -> Result<()>

fn frame_count(&self, locked: i32) -> Result<u32>

fn insert_frames( &mut self, page_size: c_int, page_headers: &mut PageHeaders, size_after: u32, is_commit: bool, sync_flags: c_int, ) -> Result<usize>

Insert frames in the wal. On commit, returns the number of inserted frames for that transaction, or 0 for non-commit calls.

fn checkpoint( &mut self, db: &mut Sqlite3Db, mode: CheckpointMode, busy_handler: Option<&mut dyn BusyHandler>, sync_flags: u32, buf: &mut [u8], checkpoint_cb: Option<&mut dyn CheckpointCallback>, in_wal: Option<&mut i32>, backfilled: Option<&mut i32>, ) -> Result<()>

Returns the number of frames in the log and the number of checkpointed frames in the WAL.

fn exclusive_mode(&mut self, op: c_int) -> Result<()>

fn uses_heap_memory(&self) -> bool

fn set_db(&mut self, db: &mut Sqlite3Db)

fn callback(&self) -> i32

Return the value to pass to a sqlite3_wal_hook callback, the number of frames in the WAL at the point of the last commit since sqlite3WalCallback() was called. If no commits have occurred since the last call, then return 0.

fn frames_in_wal(&self) -> u32

impl<A, B, C, D> WalManager for Either4<A, B, C, D>

where A: WalManager, B: WalManager, C: WalManager, D: WalManager,

type Wal = Either4<<A as WalManager>::Wal, <B as WalManager>::Wal, <C as WalManager>::Wal, <D as WalManager>::Wal>

fn use_shared_memory(&self) -> bool

fn open( &self, vfs: &mut Vfs, file: &mut Sqlite3File, no_shm_mode: c_int, max_log_size: i64, db_path: &CStr, ) -> Result<Self::Wal>

fn close( &self, wal: &mut Self::Wal, db: &mut Sqlite3Db, sync_flags: c_int, scratch: Option<&mut [u8]>, ) -> Result<()>

fn destroy_log(&self, vfs: &mut Vfs, db_path: &CStr) -> Result<()>

fn log_exists(&self, vfs: &mut Vfs, db_path: &CStr) -> Result<bool>

fn destroy(self)

where Self: Sized,

fn wrap<U>(self, wrapper: U) -> WalWrapper<U, Self>

where U: WrapWal<Self::Wal> + Clone, Self: Sized,