Struct PragmaQueryCursor 

pub struct PragmaQueryCursor { /* private fields */ }

Monotonic query cursor for repeated pragma lookups.

Reuse a single cursor when querying offsets in non-decreasing order to avoid repeated binary searches over the pragma map.

Implementations

impl PragmaQueryCursor

pub fn new() -> PragmaQueryCursor

Create a new cursor positioned before the start of the map.

pub fn snapshot_at( &mut self, pragma_map: &PragmaMap, offset: usize, ) -> PragmaSnapshot

Query state at offset assuming lookups are mostly non-decreasing.

This is the primary cursor API for the explicit pragma map. If the caller queries an older offset, this falls back to a binary search and repositions the cursor.

pub fn state_at(&mut self, pragma_map: &PragmaMap, offset: usize) -> PragmaState

Query state at offset against the explicit pragma map.

pub fn state_for_offset( &mut self, pragma_map: &[(Range<usize>, PragmaState)], offset: usize, ) -> PragmaState

Query state at offset assuming lookups are mostly non-decreasing.

This legacy tuple API is retained for existing PragmaTracker callers. If the caller queries an older offset, this falls back to a binary search and repositions the cursor.

Trait Implementations

impl Clone for PragmaQueryCursor

fn clone(&self) -> PragmaQueryCursor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PragmaQueryCursor

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

Formats the value using the given formatter.

impl Default for PragmaQueryCursor

fn default() -> PragmaQueryCursor

Returns the “default value” for a type.

impl PartialEq for PragmaQueryCursor

fn eq(&self, other: &PragmaQueryCursor) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for PragmaQueryCursor

impl Eq for PragmaQueryCursor

impl StructuralPartialEq for PragmaQueryCursor