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| ExternalRoutes& _ers | _ers | 
| inline  ExternalRouteOrderPred (ExternalRoutes& ers) | ExternalRouteOrderPred | 
| bool  operator() (const OlsrTypes::ExternalID lhid,
		    const OlsrTypes::ExternalID rhid) | operator() | 
Functor to: implement collation order on external route maps.
12.6: The distance to the last-hop, as measured from the HNA message, is used as the current discriminator; this is what's specified in the RFC.
Because identifiers for these structures are normally passed around rather than the pointers themselves, it is necessary to use a functor.
Collation order: 1. Network destination, as per IPvXNet. 2. If not self originated, distance in ascending order.
Parameters:
| lhid | the ID of the external route on the left-hand side. | 
| rhid | the ID of the external route on the right-hand side. | 
Returns: true if lhid comes before rhid.