Struct QueryCursor 

pub struct QueryCursor { /* private fields */ }

Last-observed change tick for one owner-bound added/changed query window.

Implementations

impl QueryCursor

pub fn from_spec_start<T: 'static>( world: &mut World, spec: &QuerySpec, ) -> Result<Self, QueryError>

Opens a window from the start of change history for a single-component query.

pub fn from_spec_now<T: 'static>( world: &mut World, spec: &QuerySpec, ) -> Result<Self, QueryError>

Opens a window ending at the world’s current change tick for a single-component query.

pub fn from_spec2_start<A: 'static, B: 'static>( world: &mut World, spec: &QuerySpec, ) -> Result<Self, QueryError>

Opens a window from the start of change history for a two-component query.

pub fn from_spec2_now<A: 'static, B: 'static>( world: &mut World, spec: &QuerySpec, ) -> Result<Self, QueryError>

Opens a window ending at the world’s current change tick for a two-component query.

pub fn fork(&self) -> Self

Copies the cursor without advancing its observed tick.

pub fn since(&self) -> ChangeTick

Lower bound of the active half-open change window (since, captured_now].