Trait UserIterator 

pub trait UserIterator: GcTrace {
    // Required methods
    fn next_state(&self, state: Option<&Variant>) -> ExecResult<Variant>;
    fn get_item(&self, state: &Variant) -> ExecResult<Variant>;
}

Similar use case as UserData but a bit more limited in scope

Required Methods

fn next_state(&self, state: Option<&Variant>) -> ExecResult<Variant>

fn get_item(&self, state: &Variant) -> ExecResult<Variant>

Implementors