routing: improved routing map data structure.

Change-Id: I1cde5b2b9cffcec5cbfd78c5dd4262b5fb919a73
refs: #4240
diff --git a/src/route/map-entry.hpp b/src/route/map-entry.hpp
index 84f3dd1..e4c998c 100644
--- a/src/route/map-entry.hpp
+++ b/src/route/map-entry.hpp
@@ -58,6 +58,9 @@
     return m_mappingNumber;
   }
 
+  void
+  reset();
+
 private:
   ndn::Name m_router;
   int32_t m_mappingNumber;