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As TwoHopLinkID is an indirect reference, it must be looked up via Neighborhood. Model of UnaryPredicate.
| Neighborhood* _nh | _nh | 
| IsTwoHopLinkStrictPred (Neighborhood* nh) | IsTwoHopLinkStrictPred | 
| bool  operator() (OlsrTypes::TwoHopLinkID tlid) | operator() | 
Returns: true if the two-hop neighbor referenced by tlid is a strict two-hop neighbor.