pub fn entities(&self) -> Entities<Id, Entity> {
        Entities {
            iter: self.node_map.values(),
        }
    }
/// returns an iterator over all entities.
returns an iterator over all entities.
returns an iterator over all entities .
pub fn entities(&self) -> Entities<Id, Entity> {
        Entities {
            iter: self.node_map.values(),
        }
    }
pub fn entities ( & self ) -> Entities < Id , Entity > { Entities { iter : self . node_map . values ( ) , } }
returns an iterator over all entities.
returns an iterator over all entities .
&self
&self