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As LogicalLinkID is an indirect reference, it must be looked up via Neighborhood. Model of UnaryPredicate.
| Neighborhood* _nh | _nh | 
| IsLinkSymmetricPred (Neighborhood* nh) | IsLinkSymmetricPred | 
| bool  operator() (OlsrTypes::LogicalLinkID linkid) | operator() | 
Returns: true if the link identified by linkid is symmetric.