Interface IndexGetDataRefForGet

flow-message/src/cross/mod.rs:72–77

        fn set(&mut self, key: Idx, value: data::Data);
    }
    pub trait IndexGetDataRefForGet<Idx>
    where
        Idx: ?Sized,
    {
        fn get_ref(&self, key: &'_ Idx) -> Option<&data::Data>;
    }
    pub trait IndexGetDataRefForGetRef<Idx>
    where
        Idx: ?Sized,