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Association class between TwoHopNeighbor and Neighbor. TwoHopNeighbor cannot exist without TwoHopLink. Like Link and Neighbor, there is a co-dependent relationship. Both TwoHopNeighbor and TwoHopLink cannot exist without Neighbor.
TwoHopLinks are uniquely identified by the ID of the two-hop neighbor at the far end, and the Neighbor at the near end. When the last TwoHopLink associated with a TwoHopNeighbor is deleted, the TwoHopNeighbor MUST be deleted, to conform to the relations in the RFC.
| TwoHopLink (EventLoop& ev, Neighborhood* parent,
	       OlsrTypes::TwoHopLinkID tlid,
	       Neighbor* nexthop, const TimeVal& vtime) | TwoHopLink | 
| inline OlsrTypes::TwoHopLinkID  id () | id | 
[const]
Returns: A unique identifier for this link in the two-hop neighborhood.
| inline Neighbor*  nexthop () | nexthop | 
[const]
Returns: A pointer to the strict one-hop neighbor at the near end of this link.
| inline TwoHopNeighbor*  destination () | destination | 
[const]
Returns: A pointer to the strict two-hop neighbor at the far end of this link.
| inline void  set_destination (TwoHopNeighbor* destination) | set_destination | 
Set the cached destination pointer.
Parameters:
| destination | the TwoHopNeighbor at the end of this link. | 
| inline OlsrTypes::FaceID  face_id () | face_id | 
[const]
Returns: The ID of the interface where the advertisement of this TwoHopLink was last heard by a Neighbor.
| inline double  near_etx () | near_etx | 
[const]
Returns: ETX measurement at near end of link.
| inline double  far_etx () | far_etx | 
[const]
Returns: ETX measurement at far end of link.
| inline void  set_face_id (const OlsrTypes::FaceID faceid) | set_face_id | 
Set the ID of the interface where this link was last heard.
Parameters:
| faceid | the ID of the interface. | 
| inline void  set_near_etx (const double& near_etx) | set_near_etx | 
Set the ETX measurement at near end of link.
Parameters:
| near_etx | near end ETX measurement. | 
| inline void  set_far_etx (const double& far_etx) | set_far_etx | 
Set the ETX measurement at far end of link.
Parameters:
| far_etx | far end ETX measurement. | 
| inline TimeVal  time_remaining () | time_remaining | 
[const]
Returns: the amount of time remaining until this two-hop link expires.
| void  update_timer (const TimeVal& vtime) | update_timer | 
Update this link's expiry timer.
Parameters:
| vtime | the amount of time from now til when the link expires. | 
| void  event_dead () | event_dead | 
Callback method to: tell the parent that this two-hop link has now expired.