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SubnetRouteRef holds a reference to a SubnetRoute. When it is deleted or goes out of scope, the SubnetRoute's reference count will be decreased, and the SubnetRoute may be deleted if the reference count reaches zero.
| SubnetRouteRef (SubnetRoute<A>* route) | SubnetRouteRef | 
| SubnetRouteRef (const SubnetRouteRef<A>& ref) | SubnetRouteRef | 
| ~SubnetRouteRef () | ~SubnetRouteRef | 
| SubnetRoute<A>*  route () | route | 
[const]