Method xget_mut

flow-message/src/cross/mod.rs:132–134

(&'a mut self, key: &Idx)

        Idx: ?Sized,
    {
        fn xget_mut(&'a mut self, key: &Idx) -> Option<U> {
            self.get_mut(key).map(|data| data::GetMut::get_mut(data))
        }
    }
}