[−][src]Trait rusqlite::functions::WindowAggregate
WindowAggregate is the callback interface for user-defined aggregate window function.
Required methods
fn value(&self, _: Option<&A>) -> Result<T>
Returns the current value of the aggregate. Unlike xFinal, the implementation should not delete any context.
fn inverse(&self, _: &mut Context, _: &mut A) -> Result<()>
Removes a row from the current window.